Top end performance question
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,569
Likes: 1
From: Hawaii
Top end performance question
I have a question about the top end performance of my car. I seem to be losing power at the higher RPM's and especially at higher speeds and higher RPM's. What would be some things to check into to find out what the heck is happening. My gut feeling is telling me it is my fuel pump isn't big enough to supply the amount of gas required. Any suggestions or anybody know how to tell if my fuel pump isn't big enough? My engine is a 502ci/502hp Chevy crate engine.
Thanks in advance
Maurice
Thanks in advance
Maurice
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: Top end performance question (Maurice)
Mount/tape a fuel pressure gauge to the inside of your cowl hood scoop where you can see it through the windshield and attach it to a "T" in your fule line at the carb.
More probable in my opinion is that you may have the same problem Jay, Tom, me, and certainly many others have had: A throttle bracket that has slipped at its rear left carb stud. Jay's cost his L88 about 50hp during his dyno run before he found it. I think it cost me 70hp when I compare my first Dyno Day to my recent 483rwhp Dyno Day. Your symptons are just like ours were.
Chuck
[Modified by Chuck Harmon, 12:09 AM 9/9/2002]
More probable in my opinion is that you may have the same problem Jay, Tom, me, and certainly many others have had: A throttle bracket that has slipped at its rear left carb stud. Jay's cost his L88 about 50hp during his dyno run before he found it. I think it cost me 70hp when I compare my first Dyno Day to my recent 483rwhp Dyno Day. Your symptons are just like ours were.
Chuck
[Modified by Chuck Harmon, 12:09 AM 9/9/2002]
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,569
Likes: 1
From: Hawaii
Re: Top end performance question (Chuck Harmon)
A throttle bracket that has slipped at its rear left carb stud.
Race Director
Joined: Mar 2001
Posts: 11,322
Likes: 1
From: Living in the Hartland
Re: Top end performance question (Maurice)
A throttle bracket that has slipped at its rear left carb stud.
AH HA! It wasn't the throttle bracket that slipped, but the throttle cable wasn't set correctly, I think it was only opening about 1/2 way. I haven't had a chance to go and run it yet, but I definately think that is a HUGE part of the problem. I must resist the urge to go start it at 6am...I must resist...I must resist....Neighbors will not be happy... :D
AH HA! It wasn't the throttle bracket that slipped, but the throttle cable wasn't set correctly, I think it was only opening about 1/2 way. I haven't had a chance to go and run it yet, but I definately think that is a HUGE part of the problem. I must resist the urge to go start it at 6am...I must resist...I must resist....Neighbors will not be happy... :D
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,569
Likes: 1
From: Hawaii
Re: Top end performance question (Fevre)
Well, I just got back from my test drive. Definately a HUGE improvement, I now have the top end acceleration I was missing, also picked up quite a bit lower end power that wasn't there before but knew that I should have. I am happy again.
Thread Starter
Safety Car
Joined: Jan 2001
Posts: 3,569
Likes: 1
From: Hawaii
Re: Top end performance question (Chuck Harmon)
Thanks for the tip on where to look.
If you want to see a blurry 1/4 mile video that has my car in it for a second or two, here ya go. http://home.hawaii.rr.com/sswim/movies/Z06-69-1.wmv Details on the race: I lost, yes after that lead I lost, that is the no top end power I was talking about. I ran a 13.8 at 95, the Z06 ran a horrible 13.4 at 110, he usually runs 12.9s but our track was very slick this weekend.
If you want to see a blurry 1/4 mile video that has my car in it for a second or two, here ya go. http://home.hawaii.rr.com/sswim/movies/Z06-69-1.wmv Details on the race: I lost, yes after that lead I lost, that is the no top end power I was talking about. I ran a 13.8 at 95, the Z06 ran a horrible 13.4 at 110, he usually runs 12.9s but our track was very slick this weekend.
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