so you've got a HSR, any pics?
Finally Got Dyno Test Session Complete!
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
Finally Got Dyno Test Session Complete!
Thanks to all of you who helped with my build. See my sig. Got my little issues ironed out and made a few dyno pulls, tweaking fuel pressure and timing and fuel jet on the Zex kit. Spraying a 150 shot. Ended up with 419 tq at 4300 rpms and 417 hp at5600 rpms. This is at the rear wheels, on a DYNOmite Land and Sea dyno. Suppose to be similar numbers to a Mustang dyno but I'm not sure. At any rate, I'm happy. The curve is so flat from 4300 to 6200 rpms I can't believe it. My converter more or less stalls to 4300 at WOT so I'm always in the powerband! Can't wait to get to the track. I had some false knock that I'm working out and am going to an LT1 catback because we can see the exhaust is restricting the high rpm power a little, but I'm about done for now. At least till I blow the stock rings into the oil pan.
'89 Convertible, new paint, top, and stereo.
LT headers, duals, CC503 cam, reworked 113's, HSR intake, 1.6 RR's, Crane Hi-6, 2800 stall tcs converter, 3.07's, B+M shift kit, tranny cooler, Zex 150 shot, 15 lb bottle and full accessories, tune by PCMFORLESS, Nitto 555R Drag Radials, Many little mods
'89 Convertible, new paint, top, and stereo.
LT headers, duals, CC503 cam, reworked 113's, HSR intake, 1.6 RR's, Crane Hi-6, 2800 stall tcs converter, 3.07's, B+M shift kit, tranny cooler, Zex 150 shot, 15 lb bottle and full accessories, tune by PCMFORLESS, Nitto 555R Drag Radials, Many little mods
Last edited by dan0617; Jun 27, 2008 at 09:39 AM.
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
Without Nitrous it was 290 HP and 308 torque. Curve is nice and flat, but keep in mind the timing is retarded for a 150 shot. I have it back 6 degrees, which I'm sure hurts the numbers without nitrous. I'm guessing I'd be at about 310 hp and 325 torque if I had advanced the timing. I need to buy a timing retard box to go with my Crane Hi-6. I am honestly surprised at how much torque the HSR has, and how early it comes on. I was expecting the torque to be a little less than the hp instead of a little more, and I expected it to be a little more peaky. Instead the torque comes on early and holds nicely. I also had some retard due to false knock which I'm working on and my stock L98 catback is restricting me some on the upper end.
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
No, this is a stock, 98,000 mile bottom end. I'm going to go 383 someday but today isn't the day and according to my checkbook tomorrow isn't looking good either!
I have an LT1 electric smog pump set up for crankcase evac as I do get some blow-by. At 6200 rpms on the dyno spraying the 150 shot I was getting a decent amount of smoke out the passenger side breather on the valve cover and a little (not major) smoke out the exhaust, mostly, I think, because the evac line ties into the exhaust. Probably started smoking at about 5000 rpms. When running N/A at 6200 rpms I got a tiny amount of smoke out the breather but none out the exhaust. I had no oil push out the breather at all, I did expect some. I'm very impressed with the stock bottom end, although I know I will eventually blow the rings into the oil pan. Also, I'm running the stock 700R4 with a shift kit, converter and tranny cooler. Very impressed that it is holding up with that much power to the wheels.
I have an LT1 electric smog pump set up for crankcase evac as I do get some blow-by. At 6200 rpms on the dyno spraying the 150 shot I was getting a decent amount of smoke out the passenger side breather on the valve cover and a little (not major) smoke out the exhaust, mostly, I think, because the evac line ties into the exhaust. Probably started smoking at about 5000 rpms. When running N/A at 6200 rpms I got a tiny amount of smoke out the breather but none out the exhaust. I had no oil push out the breather at all, I did expect some. I'm very impressed with the stock bottom end, although I know I will eventually blow the rings into the oil pan. Also, I'm running the stock 700R4 with a shift kit, converter and tranny cooler. Very impressed that it is holding up with that much power to the wheels.
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
I do have some pics on my other computer. I'll post them when I can. Thanks. LD-85, Ol'RJ and Makin U Shiver are the foum members who helped the most with the HSR and many others helped with the rest of the setup. Can't wait to have a forged 383 bottom end, run the same heads and cam and all, and run a 300 shot. I'm planning on 2 complete separate Zex 150 shots, 1 just after launch and 1 right after she shifts to 2nd. I think the tranny and rear will need upgraded after the first run after that setup is done. Maybe this winter....
Right now, on Nitto drag radials, I get a dead hook on launch (as long as I get the tires good and hot) and hit the spray about 1 second after launch. It has a D36 with 3.07's and for now it is holding up fine. I'm not spraying on launch because of the rear.
Last edited by dan0617; Jun 29, 2008 at 09:30 PM.
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From: Metairie Louisiana
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From: Indianapolis IN
Without Nitrous it was 290 HP and 308 torque. Curve is nice and flat, but keep in mind the timing is retarded for a 150 shot. I have it back 6 degrees, which I'm sure hurts the numbers without nitrous. I'm guessing I'd be at about 310 hp and 325 torque if I had advanced the timing. I need to buy a timing retard box to go with my Crane Hi-6. I am honestly surprised at how much torque the HSR has, and how early it comes on. I was expecting the torque to be a little less than the hp instead of a little more, and I expected it to be a little more peaky. Instead the torque comes on early and holds nicely. I also had some retard due to false knock which I'm working on and my stock L98 catback is restricting me some on the upper end.
I know that my cam is holding me back, but my HSR and my Miniram dyno readouts are nearly identical, except the HSR gave me @ 10-rwtq more than the MR.
I am sure that a bigger cam would give me more HP on the MR, but all and all, my setup has great manners and still respectably quick at 116MPH in the 1/4 mile.
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
On my 95 I'm able to use two seperate tunes and switch between them with the laptop. One is for the nitrous with 6 deg pulled and one set up for NA performance. They are both tunes originaly done by PCMFORLESS. I was told I'd lose about 7-10hp for the 6 deg of timing being pulled on the N2O tune. I usually just leave it on that one unless it is going to be a long time before I hit the track again.
That is a nice option to have. I have to stand on my head in the passenger seat with my feet on the headrest and work with my left hand to change my tune!
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
Congrats!
I know that my cam is holding me back, but my HSR and my Miniram dyno readouts are nearly identical, except the HSR gave me @ 10-rwtq more than the MR.
I am sure that a bigger cam would give me more HP on the MR, but all and all, my setup has great manners and still respectably quick at 116MPH in the 1/4 mile.
I know that my cam is holding me back, but my HSR and my Miniram dyno readouts are nearly identical, except the HSR gave me @ 10-rwtq more than the MR.
I am sure that a bigger cam would give me more HP on the MR, but all and all, my setup has great manners and still respectably quick at 116MPH in the 1/4 mile.
Also, what cam are you running? My heads are holding me back a little but I'm fine with that. I'm running a CC503 but I'm running reworked 113 heads that I bought used. They were done by Precision Motorsports in Florida. I know there are much better heads out there but not for the price I paid!
Last edited by dan0617; Jun 30, 2008 at 06:22 PM.
Race Director
Joined: Feb 1999
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From: Indianapolis IN
THANK YOU for all your help and advice with my HSR project. You and your project and results are what made me decide to go HSR. I wonder what my results would be on a dynojet? I was told the DYNOmite land and sea that I dyno'd on was similar to a Mustang. I see figures much higher than mine that make me feel like I'm losing power somewhere in comparison, but then I see the results that are much larger than mine that are on a 350 cube engine are all on a dynojet. Are my numbers good? I know it runs badazz and I can't wait to get to the track. I'm so happy I decided to do the heads/cam/all the other work myself. Makes it very gratifying!
Also, what cam are you running? My heads are holding me back a little but I'm fine with that. I'm running a CC503 but I'm running reworked 113 heads that I bought used. They were done by Precision Motorsports in Florida. I know there are much better heads out there but not for the price I paid!
Also, what cam are you running? My heads are holding me back a little but I'm fine with that. I'm running a CC503 but I'm running reworked 113 heads that I bought used. They were done by Precision Motorsports in Florida. I know there are much better heads out there but not for the price I paid!
I think your NON-NOS numbers are great considering you have the 6 degree retard, I would agree with oytur guess of 310/320 or so as well with the 6-degrees aded in.
My cam is a 233/233 Hyd-Roller with .576 lift w/1.6rr's, if I wanted to use the solid roller TPIS 701 cam, I would guess my RWHP to be 405 and the RWTQ to jump a little to @ 420-rwtq,, I know that when I went from the 225/233 to the 233/233 my RWHP jumped 30RWHP and 25RWTQ.
All in all, you eneded up with a a unique setup and one of only 3 welded HSR's that I know of.....
NOw we just need to work on the "secret HSR handshake"
Safety Car
Joined: Apr 2005
Posts: 3,624
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From: Dale City VA
I didn't remove the stock one on my 92 for this very same reason. I have however heard, that they only last a few weeks to a month if driven daily on the street.
Will
Instructor
Joined: Mar 2005
Posts: 129
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From: Layton ut
No problem, if I had space for a milling machine, I would make these plenums 4-5 at a time or RJ could weld them if somone wants the 10-piece setup
I think your NON-NOS numbers are great considering you have the 6 degree retard, I would agree with oytur guess of 310/320 or so as well with the 6-degrees aded in.
My cam is a 233/233 Hyd-Roller with .576 lift w/1.6rr's, if I wanted to use the solid roller TPIS 701 cam, I would guess my RWHP to be 405 and the RWTQ to jump a little to @ 420-rwtq,, I know that when I went from the 225/233 to the 233/233 my RWHP jumped 30RWHP and 25RWTQ.
All in all, you eneded up with a a unique setup and one of only 3 welded HSR's that I know of.....
NOw we just need to work on the "secret HSR handshake"
I think your NON-NOS numbers are great considering you have the 6 degree retard, I would agree with oytur guess of 310/320 or so as well with the 6-degrees aded in.
My cam is a 233/233 Hyd-Roller with .576 lift w/1.6rr's, if I wanted to use the solid roller TPIS 701 cam, I would guess my RWHP to be 405 and the RWTQ to jump a little to @ 420-rwtq,, I know that when I went from the 225/233 to the 233/233 my RWHP jumped 30RWHP and 25RWTQ.
All in all, you eneded up with a a unique setup and one of only 3 welded HSR's that I know of.....
NOw we just need to work on the "secret HSR handshake"
Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
I can keep you posted. Mine has been in for about 1,000 miles. Pretty hard miles considering the blow-by I get when spraying. I modified and used the stock belt driven pump for evac but it only made it about 800 miles.
Thread Starter
Burning Brakes
Joined: Dec 2006
Posts: 936
Likes: 2
From: Tyrone PA
Here is a pic of my car and a couple of the engine after the HSR install. These are before the smog pump delete/LT1 smog pump install for evac. Also, after these pics, I found that the plate on top of the throttle body was touching the inside of the hood so I ground it down as thin as I could with a grinding wheel. The thermostat area wasn't fun, had to remove all of the water jacket and as much of the IAC housing as possible to clear the swivel thermostat housing. Probably could have went with a different thermo housing to make it simpler. Other than that the HSR was simple. Heads weren't bad, cam was alot more work than I expected. It's not a show car by any means but it makes a nice driver and looks perfect from 5 feet away.
Last edited by dan0617; Jul 1, 2008 at 08:31 AM.
Instructor
Joined: Mar 2005
Posts: 129
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From: Layton ut
http://temp.corvetteforum.net/c4/ld85//vette_hsr_sm.jpg
http://temp.corvetteforum.net/c4/ld85//vette_hoodsm.jpg
Last edited by ross.rosseland; Jul 1, 2008 at 10:17 PM.
Safety Car
Joined: Apr 2005
Posts: 3,624
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From: Dale City VA
Please do (keep me posted on its durability).
thanks
Will