| Re: Car is driving me crazy: Engine tuning troubles (with a carb) |
Subject: Re: Car is driving me crazy: Engine tuning troubles (with a carb) by CentralCoaster on 2009/12/3 21:11:00 Check this out:  Ported vac equals manifold vac but turns off at throttle under ~20%. When my truck was setup on ported vac I had to increase base timing and increase the idle screw a bunch to get it to idle properly. And it pinged under acceleration at lower rpms. Also, the increased idle speed was actually causing the carb to start running on the primary jets which meant the adjusting the idle mixture screws didn't do hardly anything. IMO ported vac is good for low performance cars with a puny cam that have to pass a smog test. |
