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ST165 fuel pump?

PostPosted: Thu May 18, 2017 5:53 pm
by JRWperformance
I've done a 4th gen swap on my 165. When I get it in boost, it feels like its falling on its face. Not sure if the ECU is cutting out or if I'm leaning way out when the injectors open up during boost. Is the ST165 fuel pump adequate for a stock Caldina motor?

Re: ST165 fuel pump?

PostPosted: Fri May 19, 2017 5:23 pm
by zaluss
I ran with the stock ST165 fuel pump on my gen3 swap @17.5 psi for a year without issues. AFRs always looked good at WOT and I never ran into any fuel cut issues.

Re: ST165 fuel pump?

PostPosted: Tue Oct 24, 2017 8:00 am
by JRWperformance
Thought I would update this question with my experience. I wired up my wideband today to really see what my newly swapped gen 4 was doing AFR-wise. Under heavy loads the motor starts leaning out. By the time I was up to 5500rpm the motor was starting to creep up to a 13.5 to 1. Way too lean for me... Yep, the stock fuel pump is not enough. I'll be changing out the fuel pump for Supra Turbo pump.

So, if any other 165 drivers do the gen 4 swap, it might be a good idea to swap the pump and filter.

Re: ST165 fuel pump?

PostPosted: Tue Oct 24, 2017 8:10 pm
by zaluss
Good update though I never ran into those lean issues. I also changed it to the Supra Pump :)