Horsepower gains
Thread Starter
Racer
Joined: Jul 2003
Posts: 287
Likes: 1
From: sykesville md
Horsepower gains
How much horsepower are these modifications worth? Shortie headers, high flow cats, corsa exhaust, hyper tech stage II chip, 160 thermostat, K&N filter, custom lid, throttle body bypass, air foil, low drag pulleys. What is your opinion on horsepower gain with these modifications?
[Modified by bstirn, 2:26 AM 8/17/2003] :chevy
[Modified by bstirn, 2:36 AM 8/17/2003]
[Modified by bstirn, 2:26 AM 8/17/2003] :chevy
[Modified by bstirn, 2:36 AM 8/17/2003]
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Horsepower gains (bstirn)
Shortie headers 5-10hp
high flow cats, ~5
corsa exhaust, about 10
hyper tech stage II chip, 0hp
160 thermostat, 0hp
Changing the thermostat doesnt give more hp, it allows you to bump timing (which can increase hp) and the L98 engine tends to get better 60' times while running cool.
K&N filter, custom lid, throttle body bypass, ~10
air foil, 0hp
low drag pulleys, some say up to 10 but I'm not sold on this mod yet
Team Owner
Joined: Nov 1999
Posts: 32,782
Likes: 11
From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Re: Horsepower gains (bstirn)
With all that your around 260 at the rear wheels.
Elite Torch Red Member
Joined: Sep 1999
Posts: 57,805
Likes: 23
From: Exit 89 GSP,Lakewood,NJ The Land Of Mojo
Cental/South NJ Events Coordinator
CI 1-2-3-4-5-6-7-8-9-10-11-12 Vet
CI-II Burnout & Drag Champ
St. Jude Donor '03-'04-'05-'06-'07
Re: Horsepower gains (mackeyred96)
With all that your around 260 at the rear wheels.
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: Horsepower gains (bstirn)
GOOD question dude!
I'd like to add that if you believe all the rants from the big corvette parts suppliers etc; you read some phenominal stuff;
Claims of 40hp for removing air pump!
10-15 for cooler thermostadt
10 for TB bypass
40 for a good exhaust
15 for airfoil
etc etc :rolleyes:
Be NICE if it was right, and hey - maybe it is :D
But I think the reality is that it takes a fair bit of real work for real increases...
O/wise I must surely be up towards top fueler HP on mine by NOW!! hehhe
:lol:
I'd like to add that if you believe all the rants from the big corvette parts suppliers etc; you read some phenominal stuff;
Claims of 40hp for removing air pump!
10-15 for cooler thermostadt
10 for TB bypass
40 for a good exhaust
15 for airfoil
etc etc :rolleyes:
Be NICE if it was right, and hey - maybe it is :D
But I think the reality is that it takes a fair bit of real work for real increases...
O/wise I must surely be up towards top fueler HP on mine by NOW!! hehhe
:lol:
Burning Brakes
Joined: Jul 2003
Posts: 922
Likes: 1
From: Brisbane Queensland, Australia
Re: Horsepower gains (bstirn)
Oh and 10-15 for the K&N (Hope so as thats what I run)
The best is the additive that makes the radiator water give you 10HP+ :)
That stuff seems awfully like what I used to use in the darkroom (Ex photographer) called 'wetting agent' (By ILFORD) - about the same price now I imagine...
The best is the additive that makes the radiator water give you 10HP+ :)
That stuff seems awfully like what I used to use in the darkroom (Ex photographer) called 'wetting agent' (By ILFORD) - about the same price now I imagine...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: Horsepower gains (bstirn)
...What is your opinion on horsepower gain with these modifications?
For an LT1/4:
Shortie headers = 0HP
High flow cats = 0HP (unless your old cats are clogged)
Corsa exhaust = 5~10HP
Hypertech = 0HP
160* t-stat = 0HP
TB bypass = 1~2HP
K&N with lid = 0~5HP
Airfoil = 0HP
Low drag pullies on an LT1 with camshft driven H2O pump = 1~2 HP (only effects the PS pump)
So all that money/work will add up to ~10HP on a good day.
It's time to hang around here and learn a little bit more before you waste big $$ on snake oil.
Also, take car of the mod lists, what works for an 85-91 L98 isn't always going to work on a 92-96 LT1/4. Examples include high flow cats, MAF screens, AFPR, and pulleys.
I'd start the mod list with rear gears, and if it's an automatic trans, TC and shift kit.
Eric
Racer
Joined: Jun 2002
Posts: 401
Likes: 41
From: Parrish FL
Re: Horsepower gains (bstirn)
So many people think all those mods give you no HP gains. Well you can see what my mods have done. An A4 300 hp should have about 240 HP at the rear wheels. So I've picked up 42 HP somewhere. I'll have my 1.6 RR's dyno'd next Friday, and the shorty headers go on next Sat. Then I'll have it dyno'd again and I'll post both results.
Drifting
Joined: Aug 2002
Posts: 1,857
Likes: 0
From: Yakima WA
Re: Horsepower gains (bstirn)
I have a high-flow cat installed. Vader mentioned up to 5HP gain. Is there actually a gain by using a high-flow cat? I wasn't sure. So, with my setup, (check sig), how much HP increase would be a fair estimate? Obviously, stock is 230HP (cast iron). Oh, will the MSD 8.5mm wires make any diff?
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Horsepower gains (dbwade36)
Is there actually a gain by using a high-flow cat? I wasn't sure. So, with my setup, (check sig), how much HP increase would be a fair estimate? Obviously, stock is 230HP (cast iron). Oh, will the MSD 8.5mm wires make any diff?
