Aux Pump And VE Table

[Boosted C6]

So I installed a new aux pump setup on my 2007 Corvette ls2 and had to pull quite a bit of fuel out when the pumps turn on. So the VE table looks very odd to me now. The 1st pump turns on at 4 psi and the second pump turns on at 8ish psi. Car has a on3 turbo setup 7875 on 10 psi for now stock cam. Injectors are FIC 775 cc. Is this normal?


Before aux pump.hptnew aux pump change 2.hptnew aux pump.hpl

[Alvin]

You got to get a fuel pressure gauge on it.. The aux pumps are notorious for going super high pressure or low pressure as the pump cycles on and off. I've seen them spike over 90 psi and fall less than 35 on short shifting half throttle pulls.

[Boosted C6]

i do have a fuel pressure gauge on the regulator but I cant see while driving. if I turn them on at idle it goes from 58 psi to 60-62 psi at idle. Guess il have to get a electronic gauge that will allow me to log it with HPT.

[gtstorey]

As blind squirrel says, Mechanical gauge taped to the windshield.

[edcmat-l1]

As blind squirrel says, Mechanical gauge taped to the windshield.

Absolutely.

All cars should have a FP gauge installed for the duration of the tuning process, where it can be viewed from the driver's seat. Vehicles such as this one, forced induction in general, really should have a FP gauge a wideband installed permanently.

Not of fan of aux pumps turning off and on. Definitely creates some tuning headaches. I'd suggest turning them on much later. The pressure spike should be less.

[Boosted C6]

Ok I'll look into getting a gauge. Car does have a permanent wideband on it. I'll look into FP gauges that will allow me to log it on the scanner as well. Car seems to run great as is though without leaning out though. Commanding .78 lambda and its at .76 to .77 lambda so still rich.