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----- Original Message ----- From: <vwfye@frontiernet.net> > ... > have gone from a 115 main jet to a 130 (so far) main jet. it has been > interesting from a jetting a throttle response point of view. the old 4 tip > labored to let the motor rev to 4k rpm. the new exhaust breaths so much > better that i blip 4k with out even trying to. i would like to point out > that in my frustration, a mailing listee helped me refocus on what 'cause > and effect' to look for. so, thanks Tom Hansen! Even a dyed in the wool FI > guy can help! hehe... anyway, if i have to go bigger on main jets, i will > keep you posted of the changes an exhaust can make! btw, ask toby how much > cooler a 2007 runs with a 1 5/8 vs 1 3/8 exhaust! > Just some thoughts/questions here - doesn't the idle jet do most of the work up to a certain rpm (in the 3k range)? What I'm thinking is that you are compensating for a lean idle jet by increasing the main and that you might be rich on the top end now? This is one of those things that has ~puzzled~ me for some time now. What is the effect of the emulsion tube? Do you have an O2 sensor installed? Any inputs appreciated, Freddie Lochner '69 Notchback ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org