I won't go off topic then on this post. I'll go on HBZ if I've got questions

Looking forward for the tach to work since this is the little unknow for now (I took the tach adaptor with my kit)

Yeah, the tach is the last thing to figure out. I'll post up when I solve it.

Well, the thread has been thoroughly derailed! As to the original post, find the main jet which gives you 12.5-13:1 AFR at WOT. The e-tube/air jet combo will control the slope of the AFR curve.

it was a great derail because I never knew of MegaJolt JR. I was reading about MegaSquirt a few days ago and wondering about using it for spark only.

Now a fun project for the winter.

Follow up.

Thanks Stephen, the 120's did the trick. I tried 115's with 170 and 180 air. They just seem to have a little less torque in the 4.0k to 6.5k rpm range. The 120's seem to be the sweet spot. Just trying the different airs to see the effect on high rpms.

A/F is ~13.5 in the upper rpm's with the 115's and ~12.0 with the 120's.

btw I am cruising at 12 A/F on the highway and 12 A/F at best lean idle so the 55F11 idle jest's are too rich. I need 50F11 or 45F11's for this one. I can turn the idle mixture in 1/2 a turn to get 14.7 at idle but I still get 12 A/F at cruise.

After the experimentation to date I think the idle jet should be selected and optimized for cruise then the idle mixture's final set up shold happen AFTER the best idle jet for cruising is found. The idle jet should not be selected at idle as the mixture screw can pay havoc.

Regarding idle jets, I had good luck on several L-engine with f9 units (I'm running 50f9 with fully built L28). I can hit the trottle with no bog easily.

Engine is ultra smooth to drive since I've got distributorless ignition (running 49° advance at cruise)

I tried 55F9 but too rich.

49 degrees! Great googly moogly

This is what the engine likes so it is. Why not 50° if you ask me? just because...

If you want to know more => Autosportlabs - 240z with MJLJ

Edited August 3, 201311 yr by Lazeum