General tuning question..

I'm running a microtech ecu, got a tII w/a hybrid turbo. 720 primaries and 1000 secondaries. RB full exhaust.

Cruising, it runs fine, but under load it leans out. Seems anything close to boost causes the afr's to go thru the roof.

The weird thing is that I've got the fuel curve for load the load map way up, so I'm wondering if, in general, there are any other maps that affect the fuel settings under load?

 

Anything near boost? Or anything near secondary kick on?

 

yea i'd probably start by checking your scondary circuits. how did this problem begin occurring? did you do anything prior?

 

Y, minimal boost--I let off around 2 psi or so.
Above 3000 rpm if heavy vacuum, no problem, but if I start going toward boost either above or below 3000rpm, it leans out. -- so I assume secondaries are working.

 

How can I double-check to make sure secondaries are firing correctly?
This is a new rebuild and a new install of a used microtech.

 

i would also make sure the fuel pressure regulator is on a nipple that sees vacuum AND boost, not all of the nipples on the intake do. easiest way is to tee the boost gauge in there. if the FPR doesn't see boost, it wont raise the fuel pressure, and the car will be way lean no matter what

 

I happened to have a spare rail with a stock fuel regulator on it. Swapped it out, no more lean problems.

Thanks for the info!

 

..as an added plus, it seems to have fixed my hard starting issue also.