Dyno Results - Twin Turbo SBC 427
 

We made our first dyno pull today during my lunch hour. I snuck out a little early and finished installing the oil pump and oil pan. I'm sure I looked kinda funny to some some of Jeff's customers working in the dyno room in chinos and a polo.

Anyway, the oil pressure issue is resolved and we made one pull just to verify that everything was cool. This is with the initial tune, overly safe - a rich A/F ratio and minimal timing, and we only took it to 6000 rpm, I'll set the rev limiter at 7000 again, but we'll probably take it up to 7500 later today when I go back and we start tuning it.

This is all on pump gas, no tuning, with less than 10 psi of boost:

RPM........TQ.........HP
4100......757.9.....591.7
4200......759.7.....607.5
4300......757.1.....619.9
4400......755.6.....633.0
4500......757.9.....649.4
4600......773.2.....677.2
4700......789.4.....706.4
4800......801.5.....732.5
4900......822.5.....767.4
5000......843.5.....803.0
5100......859.3.....834.4
5200......871.4.....862.8
5300......873.5.....881.5
5400......878.0.....902.7
5500......888.5.....930.5
5600......905.5.....965.5
5700......904.0.....981.1
5800......910.0.....1005.0
5900......917.4.....1030.6
6000......922.3.....1053.7

As you can see, torque was still climbing at 6000 rpm when we stopped the dyno run, and horsepower was still climbing almost 30hp every 100 rpm, so there's still alot left in it, just the way it's tuned if we ran it up to 7000rpm or more. We're going to lean out some of the fuel map and add a couple degrees of timing. The way it looks, I could probably get somewhere around 1000-1050 ft lbs, and around 1300hp with tuning and a little more boost, and taking it all the way up to 7000 rpm or so - maybe more.

I'm going back to Fast Times today at 3:30 and we'll start tuning and turning up the boost controller. Right now boost is set at it's minimum setting, which is 9.8 psi

:eek: :eek: :eek: It's alive!!! Oh my god that is just insane!!!!

Re: (scorp508)
 

OMG, thats wicked.... How in the heck could you even leave that thing before pulling her up to 7500! You must have some excellent self control!

Congrats on getting the beast running..... We are hoping for some video so we can hear the engine at full song.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

yeowie..... :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek: :eek:

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Congratulations Monty! It's been a tease waiting for your dyno numbers. Sounds like 1300 hp is easily there with a little more rpm & tuning. I'm glad you figured out the oiling problem. The .080" oil restrictors fixed it?

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Oh yeah!!!! Great Numbers!

I cant wait to see what it makes when you have it all tuned up!
:cheers:

Re: (MikeC)
 

I'll take some .megs this afternoon when I go back, and scan the dyno sheets later tonight. Believe me, the thought of not going back to work crossed my mind, but I had a conference call I had to be at. Anyway, Jeff was busy trying to get an engine assembled for a customer and I didn't want to inconvenience him. Although I've been doing 90% of the work/troubleshooting on my motor while it was in his shop and on the dyno, he's been very helpful.

All I did was swap out the .200" restrictors for .080", and gave the pressure adjustment on the Titan pump a couple of turns.





[Modified by Monty, 1:55 PM 6/25/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Wow, great numbers Monty! I think you may need a boost controller with a lower setting :lol:

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

nice numbers man! :cheers:

did ya change your shorts after that first dyno pull? lol

anyway, how much money do you have invested in this engine?.. just curious to see how much something like that costs so i can sell my soul.

Re: Dyno Results - Twin Turbo SBC 427 (blue_stingray)
 

Thanks, I am pretty excited. I've been planning/building it since last November, so today is the culmination of over 7 months worth of effort.

The engine was initially built last summer naturally aspirated, and it made 650hp/580tq on pump gas. I ran it for a month and then decided to turbocharge it. If I were to build it from scratch as it is today, without the intermediate NA phase, it would probably cost about $35k, but it could be done cheaper with different components.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

..................................speech less :eek: :cool: :D :cheers: :crazy:

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Congratulations on your astounding numbers! How hard do you plan to push it on pump gas? Any plans to *really* push it on race gas???

Also glad to see the oiling issues were not serious.

What tires are you running again? :)

Take care,

Mark

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

excellent Monty! Glad to hear the oil pressure problem was a relatively minor fix and you didn't have to rip it apart. I can't wait to see the post-tuning numbers!

Re: Dyno Results - Twin Turbo SBC 427 (MarkBychowski)
 

:eek: :cool: :cheers:

Re: Dyno Results - Twin Turbo SBC 427 (Coupe89)
 

:cool: The curve to 7500 should be pretty interesting. How early did the boost come all the way in ? Those numbers are mental on 10 psi.

Re: Dyno Results - Twin Turbo SBC 427 (SloRvette)
 

Way to go!!! Congratulations!!

Man, boost is a wonderful thing isn't it?

Can't wait to see it all in the car and some track times. That is going to be insane!

I'm sure there were some times you were wondering if it was all worthwhile, but today removed all doubt! There's nothing like a dyno test to start the heart pumping!

Congrats again!


Jim

Re: Dyno Results - Twin Turbo SBC 427 (427Hotrod)
 

very nice results for the first pull! kick butt engine monty!

Re: Dyno Results - Twin Turbo SBC 427 (tntcorvette)
 

Monty, I have been thinking, any reason why you guys did not start the dyno curve in the lower rpm range? I am currious to how it is down low?

Also, is ther eany way to graph out the boost curve related to RPM's on the dyno pulls?


[Modified by bill mcdonald, 5:25 PM 6/25/2002]

Re: Dyno Results - Twin Turbo SBC 427 (bill mcdonald)
 

Thanks for the compliments and congratulations, it really has been a challenging, drawn out project. There were certainly times when I thought it was a waste of time and effort, but now I'm pretty excited.

The neat thing about it is that it really is "mild", the fuel ratio is on the safe side and the timing is conservative. Jeff and Mark at Fast Times said it's got 1400hp in it, but I'm skeptical about that, becuase Precision only rates each of the PT-52's for 600 hp. We still haven't even touched the boost controller. It's on the minimum setting, relying in the spring in the wastegates only. Curiously, the wastegates only have 10 pound springs, and we amxed out a 2 Bar MAP sensor, 15 psi. It's probably making about 17-18 lbs, we guess, with no signs of detonation. Jeff thought the plugs looked awesome, reinforcing his opinion that there's alot more left in the engine, and that it's a very conservative, safe tune.

We only ran it on the dyno 3 more times. I got there at 3:30 and we weren't able to start dynoing it until after 5:00 because Jeff was so busy. I felt guilty keeping him longer because he was at the shop until 10:00pm last night and he had alot of work left to do today before he left.

We only spun it up to 6600 rpm on the last run, and it made 1151hp at 6600rpm, and still climbing more than 10hp/100rpm, and peak torque was 970 at 6000rpm. It's probably a 1200hp motor at 7000 rpm with the current tune, and we weren't even pushing it hard. It only has 23.5 degrees of timing and it's still on the rich, safe side. I could probably get 1300 hp if we pushed it, added some more timing and leaned it out, but since it's a street car I want it to be reliable on pump gas in any weather. Needless to say, I think turbos are friggin' COOL! My intake air temp was only 126F with nothing more than a little fan going over the intercooler.

We tried to start the dyno run at a lower rpm but the dyno wouldn't hold it, the engine makes too much torque at low rpms for the dyno's "brake" to hold it. I think that's kinda cool too!

RPM....TQ......HP
4100...771.1...602.0
4200...768.5...614.6
4300...770.8...631.1
4400...777.7...651.5
4500...778.9...667.4
4600...788.4...690.5
4700...803.2...718.8
4800...821.7...751.0
4900...850.0...793.0
5000...874.8...832.8
5100...883.3...857.7
5200...901.7...892.8
5300...903.5...911.8
5400...927.2...953.3
5500...926.4...970.1
5600...945.3...1007.9
5700...946.6...1027.3
5800...960.4...1060.6
5900...963.2...1082.0
6000...970.2...1108.4
6100...964.2...1119.9
6200...956.0...1128.6
6300...952.6...1142.7
6400...937.2...1142.1
6500...922.7...1142.0
6600...916.1...1151.2

We just dyno'd with 93 octane pump gas, I was tempted to ask Jeff to fill the tank with some race gas but it was getting late and I could tell he was tired and had more work left to do before he went home. I plan to keep it traction limited by sticking with street tires, something like Michelin Pilots. Hopefully, that will allow me to maintain the IRS, albiet upgraded with better parts.

I wish we could have gotten the dyno runs down to 3000 rpm or so, that's where Precision said it would start making significant boost, but as I mentioned the dyno wouldn't hold the torque below about 4000.

Bill, I would ahve to put together an EXcel spreadsheet, but that's an interesting idea. That's one reason I was really disappointed that we could get the dyno to grab at lower rpms. I wanted to see the affect in power as the turbo's spool up and the engine goes from vacuum to boost.





[Modified by Monty, 9:25 PM 6/25/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

:D :cool: :cheers:

F'n amazing

Re: Dyno Results - Twin Turbo SBC 427 (bill mcdonald)
 

Monty, I bet your an extremely proud man right now. A mild mannered, streetable engine with well over 1000 hp, and it all fits under the hood for a sleeper look! That is very awesome. I know I wouldn't be able to sleep tonight if I were you. Now for some in car testing, he he :crazy: :smash:

Re: Dyno Results - Twin Turbo SBC 427 (74vetteman)
 

that is unbelievable. A sincere congratulations. Bill.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Congratulations!!
now you only need 4WD, traction control, and ABS.
:cheers:

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

I see, well I guess you have a good bit of low down TQ then!
I really want to know how the turbos spool related to RPM, I guess that is something you will know when you drive it around.

So, any vids or sound clips yet? I want to hear that things scream!

Re: Dyno Results - Twin Turbo SBC 427 (bill mcdonald)
 

I took some .mpegs but haven't loaded them to my server yet. I'll get them, as well as the dyno sheets scanned in tonight.

I think I'm going to call Jeff up and aask him to do one more pull, this time to 7000. I think it has 1200hp in with the present tune, I figure that's a nice round number, and it was my original goal - 1200hp/1000tq. I know it can do it, it's just a matter of proving it.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Way to go Monty! You're going to have a blast!

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Impressive torque, Monty

Re: Dyno Results - Twin Turbo SBC 427 (arnold)
 

WOW!!!!

WOW!!!!

WOW!!!!

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

where is Fast Times

Re: Dyno Results - Twin Turbo SBC 427 (SloRvette)
 

http://www.corvetteforum.cc/zeroimg/...withstupid.gif

Re: Dyno Results - Twin Turbo SBC 427 (Cory1970)
 

8605 Lincoln Avenue
Morton Grove, Illinois 60053 (A suburb of Chicago)
(847)966-FAST (3278)
http://www.fasttimesmotorworks.com

Jeff D'Agostino is the owner, a great guy. They are one of the top engine shops in the NMCA/NSCA/NMRA "Fastest Street Car" type racing.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Monty, WOW. I assume the oil pump was your pressure issue? I hope you don't mind me asking questions about my future project 427 NA engine.
Iam happy for you.
Phil C

Re: Dyno Results - Twin Turbo SBC 427 (wheelsup)
 

Thanks Phil.

I think the oil pump is fine. I just added .080" restrictors instead of .200" in the lifter galleys, and added two turns to the Titan's pressure adjustment. It is fine now with 40psi idling at 850rpm, and 85 psi at WOT.

If you need any help with your 427, let me know. You'll love it.

By the way, just for fun, we ran it again this afternoon during lunch to see if we could get 1200hp at 7000rpm out of the current tune, unfortunately the pipe between the left turbo and the intercooler blew out of the nomex hoses at about 6700rpm, but the hp was still climbing past 1185, so I know it will make 1200 at 7000.

I guess I'll have to weld some beads around the end of the pipes for the hoses/clamps to lock onto. Yesterday, we blew the pipe off the throttle body during a run, but I was able to fix that by tightening the T-bolt clamp a little tighter and tightening the ratchet strap a little tighter that was holding the intercooler up. It shouldn't be a problme in the car since the intercooler is firmly mounted in place, but if it is I can fabricate a brace between the intake tube and the intake manifold that will lock it in place. Jeff said he wasn't surprised it happend since the throttle body is polished aluminum and very smooth. He said it happened to them on the turbo racecar the first few times they ran it, and ended up makeing braces to hold it in place. BOOST is cool....





[Modified by Monty, 2:20 PM 6/26/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Congratulations Monty!
I am glad that everything worked out in your advantage and got your 1200HP and cool 1000#tq. This should be beast :reddevil to drive and spank on some Vipers.
Now, it's time to drop it in and make some 1/4 mile passes (well, at least one, after you run your first time and they gonna stop you because no parachute :D :D :D :D ).

Well done Monty!
Ziggy

Re: Dyno Results - Twin Turbo SBC 427 (88WHITE VETTE)
 

All I can say is, much props to Monty, and Hello 9's!! The ultimate sleeper...lives.

:flag

Re: Dyno Results - Twin Turbo SBC 427
 

WOW....... Wait let me read that again... WOW.... How come thats the only word that comes out of my mouth when looking at those numbers.

Extreemly well done. But one quick question, How is your timing setup?

Reason I am asking, is I am about to have Honest Performance (local cool shop) have their hand at re curving my distributor. I am just a little worried if they will actually be able to profile a curve that would be designed for a twin turbo.

Re: Dyno Results - Twin Turbo SBC 427 (WashingtonRacer)
 

Thanks WashingtonRacer.

I can show you my Spark Map from my SpeedPro/FAST, I don't know how much it'll help, but it'll give you an idea of where we took timing out.


http://www.montygwilliams.com/MWTurbo_Spark_Map.doc


[Modified by Monty, 10:35 AM 6/27/2002]


[Modified by Monty, 10:36 AM 6/27/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Monty

Sounds good! Have you seen a Doctor lately? :D j/k...that's a nutty amount of power. I almost dropped my soda when I read those figures(the second pull)! :eek: Be careful with that monster...and congratulations! It's been a long time coming.

Re: Dyno Results - Twin Turbo SBC 427 (JD 90 383)
 

Words don't describe those type of numbers. How are you going to get traction? Have little jets hooked up in front of the tires that spray traction compound on them? Jeez man. Nice numbers. Can't wait to see some times. Have fun.

Re: Dyno Results - Twin Turbo SBC 427 (BigBlue)
 

My plan is to install 5# springs in the wastegates, there are 10# in there now. That should reduce the power somewhat, and I can use the boost controller to increase boost past 5# if I need it or can use it on the street. I may try an electornic boost controller, which is programmable, allowing you to limit boost at low rpm ranges in order to help traction.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

The Innovative contoller is a real nice piece. Did you get FAST datalogs for the pulls ? Did the wastegates control down to 10 psi on the first pull and then you used the boost controller to up the boost on the later pulls ? Basically - The wastegates were working like they should. If the wastegates were working right you'll like the controller.

Re: Dyno Results - Twin Turbo SBC 427 (SloRvette)
 

Yeah, I was looking at either the Innovative or the HKS boost controllers.

We took .LOG's of eahc run, and it shows the 2-bar map sensor maxed out at 15 psi byt around 5800 rpm, so after that we guess the boost reached around 18 or so by 6800-7000rpm. We kept blowing pipes off abouve 6800 rpm we never got to see what it'd make at 7000. It made 1185hp at 6700 and was still climbing some 30hp every 100rpm, so I know it's a 1200hp engine in it's current mild tune. Once the intercooler gets mounted back in the car, firmly in place, the pipes should stay in place better, but for good measure, I'm going to weld a small bead aorund the end of each pipe to give something for the nomex hoses and t-bolt clamps to grab.

I'm only running 10# springs (blue)in the wastegates, and we never opened up the boost controller, so boost was only going into the side port of the wastegates, which should help them open, but it still made more boost. Jeff at Fast Times verified that the controller and wastegates are plumbed correctly. I spoke with Precision yesterday, and they said it's not uncommon to make more than the rated boost especially on a dyno. So i'm gonna swap in 5# springs (white) and use the controller to raise it as necessary.

Regardless, it still ran well and didn't detonate, so I'm not too concerned, but it's just curious. The wastegate inlet are plumbed off the collectors in a "y" so we know the design is good, it's the same way TRZ has always designed their racecars.

One neat thing is that even at an estimated 18psi of boost, the intake air temp on reached 126F, and that's with nothing more than a small floor fan going over the air/air intercooler, in the dyno room which was at least 90F+. Precision told me the their 50 series turbo's were efficient, I'd say so.

I'm just glad I didn't try to run the wastegates with the 20# springs (purple) that came in them initially!




[Modified by Monty, 11:54 AM 6/28/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

My God,,

thats no joke

Congrats on the great #'s

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

The boost control sounds like it's showing how effiecent the exhaust side of those turbos are. There isn't the back pressure in the headers to open up the 'gates. Is there a spring tension adjust on the top of the 'gates ?

Last time out with my Buick I was seeing a delta temp - ambient to intake of about 30 degrees @ 15 psi.

If you can't bead roll the pipes, weld bead is the next best thing. If that doesn't work you can weld tabs on each side of the junction and bolt it together along with the nomex hose and t-bolts.

Re: Dyno Results - Twin Turbo SBC 427
 

that is totally amazing. Though Monty, When I had my wastegate lines running to a T I was boosting in a range of 12 to 15 psi. I have 5 psi Springs in my wastegates.

I relocated the lines to the compressor outlet on each side (so that each turbo will read exactly what that turbo is putting out). and now I hit 6 psi perfect. Tomarrow if it's not raining I will take my car out to test run it now that I have my timing more controlled.
Though I am almost certain I am leaning out under boost. It explains all my problems.. I will confirm that tomarrow.. Hopefully when I am all done.. I will have HALF the HP as you..
But it's cool..

Re: Dyno Results - Twin Turbo SBC 427 (SloRvette)
 

SloRvette,

Jeff at Fast Times and Patrick at Precision both said the same thing you did - regarding the efficiency of the exhaust side and reduced backpressure contributing to the increased boost. I didn't really understand it at the time.

There's no "screw type" spring tension on the wastegates, I think those are only on the Racegates. Mine just have a boost/vacuum port on top, and another one on the side. The one's on the side are below the diaphram and are connected directly through the intake manifold so that boost can help open the 'gate. The top one's are connected through the boost controller, so that as I open the valve boost is applied to the top of the diaphram helping to hold the valve closed, and equalizing the boost applied to the side.

Sounds like my intake temps on the dyno are consistent with your in the real work then. The ambient temp outside was in the low 90's, probably more in the enclosed dyno room, and the IAC was reading 126F max inside the manifold.

I wouldn't be able to roll bead the pipes between the compressors and the intercooler, they are made from 16gauge 2" 304 stainless steel. I'll just TIG weld a bead around them. The aluminum 4" pipe from the intercooler to the throttle body was roll beaded. Unfortunately, the pipe is coming off of the TB, not the pipe itself. At that connection, I'm gonna have to create some kind of bracket as you suggested.

WashingtonRacer,

I discussed the placement of the wastegate actuator signal with Precision and the guys at Fast Times. My understanding is that connecting the wastegate to the tapped port in the compressor housing will provide the best control over the wastegate in terms of response and it's ability to control boost to a given value. However, you lose some torque and spool since the wastegate will begin to open at the earliest point. But one benefit is reduced intake temps since the entire system will never see much more boost than the basic wastegate setting, avoiding heatsoaking the intercooler.

The way that I have it plumbed, from the intake manifold behind the throttle body, provides the best turbo response since it keeps the turbo spooled longer, but it does introduce more heat into the intake as a result. Since we already know the intake temp didn't rise mroe than 126F, I can live with that. My thinking was that since this is a street car, the better turbo response would aid drivability.

I might try porting it off of the compressor housing though. Are you wastegates dual port like mine, oneport on the side under the diaphram, and one port on top over the diaphram. I would guess that you would connect the port on the side of the wastegate to the turbo, so boost could help open the gate, but what do you do with the port on top - leave it open, plug it with a pipe plug, or connect it to the boost controller? Leavng it open would allow the wastegate to open the easiest since there would be nothing pressing against the spring/diaphram, and using the boost controller would allow you to apply boost to the top of the diaphram to increase boost...


[Modified by Monty, 8:20 AM 6/29/2002]

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Monty: What changes have you made to chassis/suspension/brakes to keep this Rocket running straight and cornering smooth? I have read Merlin 522 and you seem to be in a similar situation "BIG POWER". Any ideas the rest of us can use on our cars? You have done well, I'm very impressed!

Re: Dyno Results - Twin Turbo SBC 427 (Taijutsu)
 

Admittedly, I still need to address the differential. My plan is to install forged 31 spline spindles and yokes, along with new halfshafts that are upgraded to solid 1350 ujoints. I am installing halfshaft loops, and a driveshaft loop as well. I am also looking into the 6-link systems that are out there as well, to eliminate the c-clips on the inner spindles. I'm sticking with road race type tires, so it will be intentionally traction limited (in a straight line) to help ease the load on the rear end. If I can't get the stock type IRS to work, I am looking into some of the Ford 9" based IRS kits. Unfortunately, the off-the-shelf selection of bolt in parts is pretty limited, but as with the engine, I'm not afraid of doing my homework and designing/fabricating something "one off" to fit my needs.

I already have a built 4L80E, a custom Denny's driveshaft with 1350 ujoints and forged yokes, as well as a Reactor aluminum flexplate.

As for the suspension, I've been running the full VB&P setup fro several years, including the front transverse leaf spring with tubular upper and lower control arms, low friction ball-joints, uniball control arm bushings, spreader bar, 1 1/8" sway bar, rear dual mount transverse leaf spring, 3/4" rear bar, offset control arms, Smart Struts, etc. All the bushings are urethane except the solid uniball control arm bushings. I've got HAL/QA1 12pt adjustable shocks on all 4 corners.

Brakes are my next project. right now I'm just running the heavy duty stainless sleeved calipers from VB&P, the one's with the composite insert on the pistons. I've got new rotors all the way around, all brakes lines are stainless steel, along with s.s braided hoses, along with Performance Friction pads.

However my plan is to fabricate some brackets this winter to accomodate the installation of some 6 piston Alcon, AP, or Brembo brakes up front and 4 piston in the rear, with larger rotors. Since no one seems to offer serious brake upgrades for our cars anymore, I'm gonna have to figure it out and fabricate it myself. I've seen the Porsche brake kit, but I'm looking for more than that.

It's a work in progress, that's for sure. My goal right now is to just get it back on the road within the next couple of weeks and make improvements along the way. I haven't driven it since last October, so I just want to drive it right now, I won't be pushing it hard or beating on it, just cruising.

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

Yes Monty I have a Vacume optional port on top of my wastegates. And that is a very intresting way to plumb the boost controller into that port. That would work. Usually they simplly plumb the boost controller inline on the boost line to the waste gate.

Well I have to go out and test my car and annoy the neighors. (IT's not raining thank god)

Re: Dyno Results - Twin Turbo SBC 427 (Monty)
 

:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:
:eek::eek::eek::eek::eek::eek::eek:

Re: Dyno Results - Twin Turbo SBC 427 (NewVetteLover)
 

Monty, I am speechless!! That is so frigging amazing. I'm really proud of you for sticking with it. You may even end up getting better numbers than my beast. Clearly turbocharging is the way to go for the street. Look how the serious numbers don't come on until high rpm's. That gives you a chance to hook up. By 4,000 rpm I will probably already be at my peak numbers. That is good for drag racing, bad for street power. I'm just so glad to see you finally get everything worked out. I, probably as much as anyone out there can share in how much work, dedication & frustration it takes to get to this point. I really wish we had done an engine dyno because my numbers are going to be at the wheels, not the flywheel so it's going to be tough to compare. I'm thinking with race gas & higher boost you will definitely see close to 1,500HP - which was my goal. Out of a small block. AMAZING!! So based on your numbers it looks like if I go ahead & turbo charge that 708, we could be seeing numbers as high as 2,500HP. YIKES!!!

Re: Dyno Results - Twin Turbo SBC 427 (88WHITE VETTE)
 

Monty. on the intercooler pipes, since they are alum, weld a small strap, and a corresponding block on the other tube and they use a small screw.

I kept blowing hoses apart on my turbo buick, and this fixed it. we are up to running 25 psi on the TE45 turbos.

with two of those, I bet there is about 1800 hp in your engine if you care to crank it. not sure if anything else in the drive train would stand up to that much HP!!! that's the great thing about a turbo engine, more power than you can use.

wretched excess is never enough!!! looking forward to some tales of a ride.

still looking for some good folks to help turbo the ZR1. I now have an LPE 368 which is a good foundation. I will give fast times a call.

they sound like a solid candidate. cya.

Re: Dyno Results - Twin Turbo SBC 427 (Merlin522)
 

merlin522
Just got through viewing Series 25.
Your car is really starting to come together.
I am doing a 66 roadster. I want to have my gauges recalibrated.
Could you give me ClockDocs phone number or web address?
Thanks
noelga

Re: Dyno Results - Twin Turbo SBC 427 (88WHITE VETTE)
 

Speechless....just speechless :eek:

Re: Dyno Results - Twin Turbo SBC 427 (red90sixspeed)
 

noelga - Bill Russell 1-800-256-5362 http://www.clockdoc.net Rocketsleds@aol.com

Re: Dyno Results - Twin Turbo SBC 427 (Merlin522)
 

Way to go monty again :eek: Talk about a raped ape on the interstate :D

Rkreigh

Might want to give Kooks custom headers a shout. They are up in NY and can get your zr1 turboed if you need I talked to them just didnt want to ship my car cross country for work to be done.