one-mod HP gains
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Supreme Member
Joined: Jan 2002
Posts: 1,162
Likes: 1
From: California
Car: Z28
Engine: L98
Transmission: T56
one-mod HP gains
Just wondering if everyone could post their "one modification only" horsepower/torque gains for TPI motors, as verified by chassis or engine dynos? I'm curious to see what the single biggest power adder bolt on is.
For example....in the recent stealth ram thread, the following was posted:
Wow! I have to wonder, if this means that the stock L98 exhaust manifolds can support up to 240HP, at least? Making a better intake a "better" bolt on than say, SLP headers?
For example....in the recent stealth ram thread, the following was posted:
Originally posted by e-man
This is from a guy that works for holley
--------------------------------------------------------------------------------
Here's the chassis dyno results!
Car is an automatic 1992 5.7L Camaro. Car is bone stock except cat back.
We added the stealthram and a Holley billet 58mm throttle body. That was the only changes. I don't think the throttle body makes much of a differenece at this power level.
This data is for 3rd gear RWHP on a dynojet.
RPM Stock HP Stealthram HP Diff
3400 190 175 -15
3600 200 188 -12
3800 209 198 -11
4000 210 204 -6
4200 212 210 -2
4400 213 223 +10
4600 214 234 +20
4800 210 240 +30
5000 198 239 +41
5100 184 238 +54
5200 174 237 +63
This is from a guy that works for holley
--------------------------------------------------------------------------------
Here's the chassis dyno results!
Car is an automatic 1992 5.7L Camaro. Car is bone stock except cat back.
We added the stealthram and a Holley billet 58mm throttle body. That was the only changes. I don't think the throttle body makes much of a differenece at this power level.
This data is for 3rd gear RWHP on a dynojet.
RPM Stock HP Stealthram HP Diff
3400 190 175 -15
3600 200 188 -12
3800 209 198 -11
4000 210 204 -6
4200 212 210 -2
4400 213 223 +10
4600 214 234 +20
4800 210 240 +30
5000 198 239 +41
5100 184 238 +54
5200 174 237 +63
Member
Joined: Jul 1999
Posts: 269
Likes: 0
From: SE, NY, USA
Car: 1988 Vette; 1988 IROC Z-28
Engine: 350cid; 305cid
Transmission: 700R/4; 700R/4
Axle/Gears: 2.59; 2.77
I don't have any dyno pulls nor trap speeds on single mods but those are impressive numbers. From a dual cat setup no doubt.
I assume that was from replacing a stock TPI intake considering the drop in low end grunt.
I assume that was from replacing a stock TPI intake considering the drop in low end grunt.
Supreme Member
Joined: Sep 1999
Posts: 3,197
Likes: 10
From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
If you ask me you're just opening a pandoras box of misinformation here. Results for mods will vary depending one what you have done already. I guess it'll be interesting to see if anything good shakes out though
edit....well i'd say the guy below me is a good one for this post, lol
edit....well i'd say the guy below me is a good one for this post, lol
Last edited by Ed Maher; Apr 25, 2002 at 06:03 PM.
Joined: Nov 2000
Posts: 1,022
Likes: 0
From: Newington, CT
Car: 88 IROC
Engine: 5.7 RamJet
Transmission: T56
Axle/Gears: Dana44 4.10
A friend of mine has a completely stock 91 305 engine. Not even so much as an AFPR and he is getting 320 HP and 370 TQ at the rear wheels using a ProCharger. This is through stock 305 exhaust manifolds and dual cat Y pipe, and an Edlebrock catback.
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