Well I've finanlly took my car for its first dyno visit after the recomended miles by the builder.It put out a whopping 304hp/338tq, which was'nt much better when it put out 281hp as a 350 with a hydraulic roller cam as oposed to a solid roller an in a 396 :cry I'am not a little confused' I'am a lot confused!The combination I have is 58mm tb,mini-ram manifold,crane gold rr,AFR 195 gasket matched,ported by ARE, Diamond pistons, Eagle 5.85 rods,Callies Racemaster crank,MSD8.5 wires,Hooker super comp headers 1.75,true dual exhaust w/o cats,Flowmaster mufflers,3600Vig stall,3.75 gears. The motor is 9:1 compression, is this it for my combination as for as power goes ????Please tell it gets better(motor has 2000 miles on it).Speed Works in Lewisville is sendind my prom chip back to Ed Wright to get it reprogram wish me luck.Sorry about the lenght of my post.

 

Dumb question, but why such a low compression ratio? What is the cam specs of your engine?


[Modified by tjwong, 12:10 PM 12/21/2003]

 

:iagree: You may have too much cam and too little compression, not a good combination.

 

:withstupid:

 

tjwong my cam specs are 230/236 @536/587 after lash being set on a 114 lsa,the comp is that low because I have a Procharger d-1 that I plan on having installed in a couple of months(I also have 8-rib pulley set currenly on car)pullied for 14 lbs. of boost.Thanks for the reply. :)

 

Idealy a street driven supercharged engine should have a mild cam for 2 reasons 1) an agressive cam may cause backfireing 2) The mild cam will give you good low down torque before the supercharger is spinning fast enough to make full boost. As rpm goes up and the cam is getting less efficient the supercharger will be getting more efficient giving you a flatter torque curve then if the cam made more torque up high. Low compression + mild cam = not very impressive power. however, low compression + mild cam + supercharger = kick azz street car

 

With a cam as big as yours with 9:1 its going to be on the soft side. What was the HP, torque and RPM peaks? When you get your blower installed the numbers will be much better. However IMHO I think 14 PSI is on the high side of things for 92 Octane pump fuel. Especially without any kind of intercooling or water injection.

If you measure 14 at the blower and 12 at the intake that would be more acceptable. I will be curious as to how your 8 rib system works. Getting over 12 PSI without slippage is hard to do with a serpentine. I have a cogged belt system in my car that I designed and built.

I would have went with a cam with more exhaust duration to get the spent gases out. A friend of mine made nearly 600RWHP with 8 PSI of interecooled boost in his 93 LT1 vette. His cam was lots smaller than what you have if I remember right it was in the 220's, with modest lift numbers in the .530 to .550 range.

I am upgrading my system to a T trim this winter sometime, and I will stay with about 10 PSI max boost for the street. The only reason I am doing this is because I am running a S trim Vortech blower now and I am off its map as far as efficiency goes, by switching to a large T trim I won't have to spin it as hard and it will be intercooled as well. In doing so I will increase the efficiency a considerable amount without having to spin the blower off its curve. I have also redesigned the intake assembly of the blower to a much higher flow unit that what was supplied by Vortech, that alone will help it breath easier as well.


[Modified by tjwong, 2:10 PM 12/21/2003]

 

The motor was built by Agostino Racing Engines in Canada, it was built with the 14lbs. in mind, the cam used was speced by them for a blower motor its a solid roller I do'nt know if that makes a differrence or not? Iwas under the impression that the cam was small for a mini-ram 396?? I also have the dual intercoolers with my D-1,down here in TEXAS we have acess to 93 octane which I run in my car , I do'nt know if that will help much :confused: Black BART ,and other forum members that have the 8-rib conversion seem to be successful with it thats why I had ASP to make the set up for my car to help eliminate the dreded belt slip issue.Thanks for the information coming I'am learning as I go guys :cool:

 

When you dynoed the car did you get a AFR reading from it as well? That will tell you how close the tuning is. Ideally for a NA engine you should see around 12.5:1 for when you have a blower you will want to see 11.5:1, that is a safe AFR for boosted applications.

Getting a 8 rib system to work seems to be easier in a F body where they have more room to get the blower installed and less bends, for every bend and intercooler you will have a pressure drop. Once can have as much as 4 PSI depending on the bends and the intercooler designs, which means you may have to build up as much as 18 PSI at the blower to get the 14 at the intake. Thats when the belt slippage comes into play. Thats why I have a cogged belt driving my blower.

Good luck with all of it let us know how it runs with your blower.

 

Looking at the printout :from 2800rpms to 3800 it was at 13,from3800 to 4600 it was at 11, from 4600 to 6400 it went up to14 on the AFR. I have the dual intercoolers that came with the kit for now. Well I hope it makes a little more power after they get the chip back from Ed Wright. Man this is depressing :sad: :sad: I'll keep you posted on the progress,or lack of it :lol:

 

I wouldn't worry about low numbers until you get the blower on. An engine built for a blower won't make much power without it. An engine that makes good numbers NA won't work very well with a blower. (you'd have to either keep boost really low or use race gas)

 

:iagree:
My supercharged 9.1cr 383 makes 433rwhp / 505rwtq.
Without the blower it's only 220rwhp / 330rwtq !!!

Just get the thing broken in, then install the procharger and be happy :jester

 

A little off the subject, but why are you running such a high stall converter? I would think that the added cubic inches and 3.75 gears would allow you to use around a 3,000 rpm stall.

 

I also recommend sending your chip to Jesse.

Ski_dwn_it

You will get more custom tuning.

 

Without the blower you have killed your low end torque. You have large headers, large TB and a big cam....that makes little torque with low compression. Wait for the tune and blower and then the fun begins. :D