Quote:
Originally Posted by Hurst65
I finished installing the wideband gauge this morning and started to do a little tuning.
The idle was pig rich! Jon, you were right! The gauge was reading between 12.12 & 12.5:1 at idle. So, I turned the mixture screws in all the way and then back out 1 turn. That proved way too lean-- the car wouldn't idle well and the gauge was pegged out. I then went another turn out, for a total of two turns. That was a close but, a little too rich. Right now, I'm at 1.75 turns on the mixture screws and the gauge is reading about 14.5:1.
I never knew that the mixture screws were that sensitive. The slightest little turn makes a big difference!
I think I'm okay with the idle. It idles real nice at a steady 900 RPM, w/15 degrees of timing, pulling 11" of vacuum, and the wideband gauge reading 14.5:1. The idle is really smooth-- almost stockish.
Ok.... so, then I went for a short drive. The mains are pig rich too! The gauge was reading about 11:1 to 11.5:1, in any gear, at 2500 RPM. How much of a jet change do you guys think I need to make?
Thanks!
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What happens if the idle speed is more reasonable? 900 is kinda high.
Is that 11" of vacuum at idle the most the engine will make at that throttle position? Does changing the idle mixture screws increase the vacuum from there?