Specialty Forums > Racing

GCVW'S Aug 21 st Mission raceway

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Bruce:
The idle jet is irrelevant to drag racing.  However, you're going to be driving it around for the weekend, right?  I suggest to put some 65s in it and do not touch the mixture screws or the throttle stop screws. It will be a bit rich, but it will run well.  Then when you go home, just put your 60s back in to regain your original tune.
An easy first guess for the main is to increase it by 5.

jim martin:
Neal I'm glad you have it figured out ,and if you are asked you have the correct answer.

Neal do you run a a/f gauge or have you ever done a full pull and shut down at the line
And looked at the plugs
Just wondering how close your tune is at present with those raptor vents.


Bruce is correct I would start by increasing main jet ,if it feels at all lazy shut it down and pull a plug and inspect.

Yes you can do the same by decreasing air as well I just like big mains.
My last engine combo with carbs ran square jetting and say I ran a 180/180 ,200/200 or larger for example ,end result was the same A/F
Ratio
I found the larger jet stack would back half better,possibley do to those big mains slurping all the fuel up

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