View single post by Judson Manning
 Posted: 06-24-2008 01:54 pm
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Judson Manning



Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406
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 There is no 'correct' jetting....only starting places for you to begin tuning your specific engine and driving style.

IMHO the Dells available through the JHPS (145 mains) have a MUCH better starting point than the Lotus Spec5 & Spec9 (160 mains) available through previous sources. 

Lotus with all of their resources began with 142mains with Spec1, went 'down' to 130mains, back 'up' to 160 mains, then finally ended up with 135mains on the Spec10.  Of course they were changing all of the other jets, camshaft profiles, displacement, timing, etc. so it really is a crap-shoot.

It took me years of research playing around with different jet combinations and utilizing O2 sensors and EGT gauges to get where I wanted to be.  Without the aid of such devices, running a bit rich is cheap insurance.