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Old 04-13-2016, 09:29 AM   #11
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Default Re: Lazy off the line

Hans, I'm sure it is brother. I had read somewhere that a C6 will eat about 60-70hp vs. a C4 at 30-40?

This car was originally an F code 302 with a C4, I sold that pair to drop in the New combo. If I could go back I would have kept the C4 and had it prepped for this application rather than going with the C6....but, I'm not terribly concerned at this point. My aim is to bracket race this car and have some fun and learn along the way. Future SS build will of course, NOT include the C6
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Old 04-13-2016, 02:17 PM   #12
Mike Pearson
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Default Re: Lazy off the line

Not enough rear gear. Carb is too big. Cam needs to be advanced not retarded. That is killing the low end. Fix all of that stuff and it will run much better.
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Old 04-14-2016, 09:56 AM   #13
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Default Re: Lazy off the line

Pressure in the rear tires (10 psi) seems on the low side in my opinion.
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Old 04-16-2016, 06:27 PM   #14
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Default Re: Lazy off the line

K.I.S.S is the best principal to use in racing, Adger and Keith have great suggestions, I will deviate from KISS and say to Check your converter, could be junk and it's slipping.
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Old 04-17-2016, 10:06 AM   #15
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Default Re: Lazy off the line

Hi. I also believe the heads are too big, especially for the compression ratio. Not enough lower rpm velocity. Since you are just starting out with the idea to be racing for a long time. Buy your self a data logger system. I use Racepak. Most of these issues will show up in a very runs and can actually save you time, money and frustration. I have never seen anyone who finally bought a data logger regret spending the money.
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Old 04-17-2016, 09:19 PM   #16
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Default Re: Lazy off the line

Well, just wrapped up a great weekend at Pacific Raceways up here in WA state. Two separate races sat & sun we went down for both. Basically treated the races as a test and tune to see what we could get out of the car given its current running condition.

Improved ET and 60' a little bit by throwing a bit more timing and jetting down.l (it was a bit fat) Car runs pretty consistent though, it is dial-able (still learning the car of course)

Won in round one on Saturday but lost round two. Bummer was that I was comatose on the line. Worst reaction time I've ever put on a time slip. Lost my composure! (First time going beyond the first round of elim's).

Bigger bummer is that my opponent was so far slower on his dial I only needed to cut a .120 light to have won. Kicked my own butt all night after that one!

Sunday went good, found a good spot on the tree, worst RT was a .090 in three passes. Broke WAY out in the first round. I dialed slower, car picked up.

Fun weekend nonetheless.

You boys offering up advice, I hear ya and gonna put 4.56's under it soon. Gonna try a 750HP and see if that helps, looking at a different manifold as well. But other than that I'll just run as is this season. I'll certainly be digging deeper into the situation this winter, gonna look into a more appropriate cam for sure. Maybe a looser converter.

For now, I'll keep absorbing info from folks like you guys and taking it one step at a time.

Sure is fun though, even in the 12's!

Last edited by bnsfmachinist; 04-17-2016 at 09:22 PM. Reason: Words
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Old 08-28-2016, 05:07 PM   #17
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Default Re: Lazy off the line

Originally Posted by Adger Smith View Post
Why is the cam listed as 2 deg retarded with only 10.5 Comp?
Why such a high leave RPM?
Footbrake lower and hit the converter stall harder.
Might be loosing TQ multiplication of the converter.
I would put a little more timing in it before I re jet 2 lower.
X2 on everything
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Old 08-29-2016, 09:36 AM   #18
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Default Re: Lazy off the line

I agree with the above advice. When I read the initial post, I felt the carb was too big, the intake too aligned to high rpm (especially depending on how it was ported), and the rear gears too mild. Yes, the carb and intake may match the ported heads, but the overall result is consistent with a high rpm combination, and is being killed by a low rpm combination elsewhere.
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Old 08-29-2016, 11:53 AM   #19
Dave Turner
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Question Re: Lazy off the line

How much total timing do you have dialed-in....all in by??
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Old 09-27-2016, 11:22 AM   #20
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Default Re: Lazy off the line

How tall are your rear tires?

3.90s wouldn't be bad if you had 26-27 inch tire i've been mid 1.50s in a 3200lb amx with 4.10s and 28 inch tires with a much milder than your combo 390. that 1.90 sixty foot definitely indicates a issue somewhere.
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