422 down 40HP AND 40TQ
Thread Starter
Racer
Joined: Nov 2001
Posts: 267
Likes: 0
422 down 40HP AND 40TQ
I recently dynoed my car to see what the was at the wheels, because it didn't feel as strong in 4th gear. The car made only 470 rwhp and 458 rwtq. So now i want to what could have gone wrong. It still ran the same time it ran the first time out 10.75 @ 130.98 and now it went 4-5mph less and it was a hotter day. It was dynoed at Cartek at 510rwhp and 498 rwtq. Can you wounder what the car would run if the power was there. If any one has an idea let me know. One more thing, does any one have a problem with the idal staying high in tell you stop at a dead stop.
[Modified by 02Z06VETTE, 4:23 PM 6/12/2003]
[Modified by 02Z06VETTE, 4:23 PM 6/12/2003]
Safety Car
Joined: Dec 2000
Posts: 3,950
Likes: 32
From: belleville n.j.
Re: 422 down 40HP AND 40TQ (02Z06VETTE)
well what i would have done is check your DIC to see if you have any error codes. then you could have checked the obvious that's visible such as a dirty MAF sensor from extra oil from the filter element of your intake, bad gas, clogged injectors, dirty air filter, clogged fuel filter, etc. does it have high mileage? tune-up? spark plugs, wires?
have you called cartek?
have you called cartek?
Safety Car
Joined: Dec 2000
Posts: 3,950
Likes: 32
From: belleville n.j.
Re: 422 down 40HP AND 40TQ (02Z06VETTE)
One more thing, does any one have a problem with the idal staying high in tell you stop at a dead stop.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: 422 down 40HP AND 40TQ (robsvette)
after a radical tune the computer still drifts to 'optimize' running. It may need to be updated. New idle issues often coincide with intake and A/F issues. Did you recently clean your filter and possibly clog it with too much oil?
Le Mans Master
Joined: Jul 2002
Posts: 6,147
Likes: 32
From: Dallas TX
Re: 422 down 40HP AND 40TQ (SpinMonster)
Hmm you sure its not the dyno? Have you changed anything on the car at all? Like someone else suggested, check the air filter, also the AF ratio and timing.
I'd like to see some of those Cartek cars dyno at other places besides their shop.
I'd like to see some of those Cartek cars dyno at other places besides their shop.
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Re: 422 down 40HP AND 40TQ (02Z06VETTE)
Suggest you check your ltrims. If they have gone positive and your adding fuel at WOT it could cost a lot of power.
I did have the "cruise" effect. Your likely getting it when the car is warmed up?
Lower your running airflow in the idle and limiters table with Edit. Try -.25 at a time at 80*C and above. Drive at least 50 miles before you try again. See how the first try reacts. You might notice changes in warm starts etc. If you need more help, let me know. I'm sure others can help also. I ended up reducing mine by over 2.0.
:steering:
I did have the "cruise" effect. Your likely getting it when the car is warmed up?
Lower your running airflow in the idle and limiters table with Edit. Try -.25 at a time at 80*C and above. Drive at least 50 miles before you try again. See how the first try reacts. You might notice changes in warm starts etc. If you need more help, let me know. I'm sure others can help also. I ended up reducing mine by over 2.0.
:steering:
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: Mar 2001
Posts: 2,372
Likes: 51
From: New Milford CT
Re: 422 down 40HP AND 40TQ (robsvette)
quote:
--------------------------------------------------------------------------------
One more thing, does any one have a problem with the idal staying high in tell you stop at a dead stop.
I think what he means is that the idle stays higher say 1500/2000rpm when the clutch is in and you are slowing for a stop. My car occasionally "hangs" on a higher idle like this, but only if I have gone serious WOT, then slam on the brakes with the clutch in.
Le Mans Master
Joined: Jun 2000
Posts: 5,653
Likes: 1
From: Lone Tree CO
Re: 422 down 40HP AND 40TQ (CJS)
Your idle problem could be the result of a "relearn". It has happened to me before. If you disconnect your battery for any reason it may need a few miles to relearn and should come back to normal soon.
Melting Slicks
Joined: May 2002
Posts: 2,911
Likes: 29
From: Mount Pleasant SC
Re: 422 down 40HP AND 40TQ (02Z06VETTE)
Not pertaining to this hread, but Freddy, is your brother ever gonna get me those headers that I told you I would take 2 months ago :confused:
[Modified by 1 slow 97, 7:13 PM 6/12/2003]
[Modified by 1 slow 97, 7:13 PM 6/12/2003]
Melting Slicks
Joined: Feb 2002
Posts: 2,290
Likes: 1
From: Ca
Re: 422 down 40HP AND 40TQ (SpinMonster)
Partially sounds like a tuning issue. You should have the car autotapped to see how it is running.
With LS1edit you can play with the idle behavior. If your car takes a while to come down to a proper idle and it isn't a result of someone tuning it to do that...you could also have a vacuum leak. A piece of my pcv came disconnected and idle behaved like that until I reconnected it. Just a thought.
Robert
With LS1edit you can play with the idle behavior. If your car takes a while to come down to a proper idle and it isn't a result of someone tuning it to do that...you could also have a vacuum leak. A piece of my pcv came disconnected and idle behaved like that until I reconnected it. Just a thought.
Robert
Safety Car
Joined: Dec 2000
Posts: 3,950
Likes: 32
From: belleville n.j.
Re: 422 down 40HP AND 40TQ (kumar75150)
I'd like to see some of those Cartek cars dyno at other places besides their shop.
Drifting
Joined: Feb 2002
Posts: 1,737
Likes: 17
From: mantua nj
Re: 422 down 40HP AND 40TQ (robsvette)
i had my car dynoed at another shop also here in south jersey....mine was 3 rwhp more and 5 rwtq more on a different dynojet....
ohh and my car still runs 10s all motor stock bottom end :D :D :D
ohh and my car still runs 10s all motor stock bottom end :D :D :D
Le Mans Master
Joined: Dec 2000
Posts: 6,312
Likes: 399
From: North Haven, CT
Re: 422 down 40HP AND 40TQ (robsvette)
I'd like to see some of those Cartek cars dyno at other places besides their shop.
i know plenty that have. one of them being billy2kfrc. as a matter of fact his car dynoed a little higher at another shop in connecticut. it obviously has nothing to do with the shop dyno but something small with the car itself. having their very first 3 year old head and cam set-up myself i'm still running 11.5's at the track with no problems.
i know plenty that have. one of them being billy2kfrc. as a matter of fact his car dynoed a little higher at another shop in connecticut. it obviously has nothing to do with the shop dyno but something small with the car itself. having their very first 3 year old head and cam set-up myself i'm still running 11.5's at the track with no problems.
Freddy, if I understand you correctly, your car went 10.7 at 130 before, but now went 10.7 at 125 on a hot day? Also, you say it feels slower? I bet your car would make 470rwhp right now on Cartek's dyno as well, it probably just needs some re-tuning, call Cartek, Julio will fix you up. :cheers: :cheers: :cheers: