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Discussion Starter #1
Guys, I have a T-78 set up with the dual fuel pump configuration. When I dynoed my car, I could not get my A/F ratio to remain flat at around 12:1. It would be way rich at one point and then lean on the next 500 RPM. I have a Walbro pump running at 12V in addition to stock running 9/12 configuration. The HKS fuel rail was fed from only one end with the other end going to the FPR. I have changed the fuel system to dual feed to the rail but have not yet dyno to see if it helps. Does any have the same problem? Could it be the problem with the stock pump running 9/12v when transitioning to 12V? Thanks.
 

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What chip is in your VPC? How much fuel pressure are you running static? Is the fuel pressure rising accordingly to boost?


Which injectors do you have?
 

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Discussion Starter #4
Injector:680/720 ND, 680 chip, Fuel pressure was rising to 5 bar on 2 bar run, static pressure was on 3 bar with vaccumn line disconnected.
 
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