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Old 04-11-2013, 01:17 AM   #1
Scooby Newbie
Member#: 225423
Join Date: Oct 2009
Default New ID850 injectors, uneven trims

I put ID850 injectors in my 2008 STi.

Before this, my trims were all zero, and under boost the target fueling was dead on with a wideband. So I'm pretty sure my MAF tuning is good.

Now with the ID850's, I can't get both the trims and the open loop to line up.

ID publishes the latentices for the injectors. If I put these in, I need a flow scaling of ~800cc/min to get nice even 0% trims. However, then under boost it runs about 10% rich. I'm only boosting the wastegate pressure of 13PSI for my turbo right now.

If I put in 885cc/min, which is what the injectors are rated at, I get perfect AFR's under boost, but my cruise trims are off up to 10% (the ECU is adding fuel under cruise).

The weird thing is that the trims add more fuel as my MAP goes to less vacuum, so I'd think a vacuum leak would need more fuel added at idle, not at near 0 vacuum. This could just be the latentcy being of a touch though.

I've checked for a vacuum leak, but I can check again..

Is there anything but a leak that could cause this issue? Am I missing anything but injector scaling and latentcies?
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