Team Camaro Tech - View Single Post - Timing & Vacuum Advance 101
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post #27 of (permalink) Old May 22nd, 11, 01:32 PM
boboftherockies
Tech Team
 
Join Date: Aug 2005
Location: Colorado
Posts: 81
Re: Timing & Vacuum Advance 101

JohnZ;

I'm posting this just to give testament to what you have stated here. I implemented the change to full manifold vacuum and adjusted the timing and mixture on my GMPP 350 / 350 hp crate motor with FAST EzEFI and what a difference! Smoother idle, more responsive throttle, cooler and better mileage. I'm in Denver and the engines run lean to start with up here and my idle was always unstable. Now, it sits at 750 without much variation with 12 deg static / 25 deg with 13 " vacuum. 36 deg total timing w/o vacuum. Air Fuel ratios at idle = 13.8:1 AF, 14.8:1 at cruise and 13.8:1 WOT....all on regular gas.... lovin it!

Thanks John!!!

Bob

69 Camaro
Le Mans Blue Coupe, 350 GMPP/HO with FAST EZ EFI, TH350
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