Thread: IDF Tuning Help
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Old 09-14-2012, 07:08 PM
jabbott jabbott is offline
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OK, did some more tuning today.
I had ordered 36mm chokes, but unfortunately they didn't send them. So this is with 40mm chokes.


I soldered over the holes and re drilled them.
the air jet is now about a 110
the main jet is now about a 150
and the same f11 tubes
idle screw 1 1/4 turns
60 pump bypass

As you can see by lowering the air bleeds it brought the upper rpm down in afr closer to the mid-range. It still goes leaner at about 4600 but its much better. I can totally see how in one of the books you have it says 60 - 80 because that's probably what would have made it close to perfect.
I also lowered the main jet back down to lean the whole thing out a bit.
and i drilled a bypass in the pump jet to get rid of the massive rich condition on the initial hit.
Also i turned the idle screws out a little bit richer and it idles around 13 afr.
between all those mods the car drives good. No hesitation or bog at any throttle or rpm.

Last edited by jabbott; 09-15-2012 at 08:20 AM..
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