Hey guys,

Went over to a local tuner the other day and found some type of strange issue with the Fuel system. My car isn't spooling until 4000k. We found that, even with the AFR maps way rich, that i am running lean until 4500k. It looks like the fuel is delayed in getting to the motor?

The net effect is that I still hit peak boost, but it takes longer to get there. Also, we checked for boost leaks and only found a couple of small ones (throttle body).

I have a Walbro 255, TBE, Air intake, and IX MR BOV. Im gonna pull the fuel pump tonight and inspect for leaks. Any other suggestions? Im taking the car back to the tuner at the end of the month but wanted to see if anyone had seen this before.

Thanks!

 

leaner the fuel during spool, the quicker it gets to full boost. Stock fuel pump?

 

If your tuner can't figure out the problem, might want to check out another tuner

 

Na, hes got the fastest evo where im at and knows his ****, we only had a couple hours to look at it.

 

fuel filter issue?

check the voltage to the FP maybe.