Having a problem. When my boost comes on my motor leans out. It's not poping or running back, but I back out when I see my A/F meter drop.

Here is a sample of a data log I ran today.

rpm psi Throt % Air F Inj mS Duty % Advan BTDC A/F mV
4520 0.9 33 98 8.608 36 25 747
4520 1.8 36 98 4.488 40 25 643
4640 3.3 38 99 4.624 36 23 96
4760 3.4 46 99 5.040 39 21 13

See the problem? I have checked my fuel pressure and it's a solid 40 PSI all the time. My injectors have been serviced and blueprinted. (Stock 550cc units).

I can't figure out why it's dropping out so.

 

Looks like when the secondarys come on it's leaning out. Add more fuel.

 

Your datalog shows that you're only 1/3 to 1/2 throttle.
Why do you care if you're lean or not?


-Ted