My car has the racetronix fuel pump upgrade and just recently I ran my car down to empty. It was basically on fumes.

Well the fuel pressure was dropping from 60psi to 0. So I put just under a 1/4 tank in and the pressure would still drop, but only to between 40-50psi under WOT. All this pressure drop has been N/A...........NOT using the nitrous. I have a wet kit spraying 175shot.

Today I went and put 3/4 tank to see it that would help and the pressure still drops to about 52psi under WOT.

Does anyone elses car do this? And should I be worried about spraying it at the track? I want to take it out to the strip tomorow, but when the nitrous add more of a fuel demand, I'm worried it'll become MORE of a promblem.

BTW, this just started happening yesterday. My car never dropped below 57psi under WOT N/A. I've never had the chance to see what it dropped to before when I sprayed my nitrous either. But I don't think it dropped that much even with the spray. Not too sure though.

 

Does it momentarily drop down, then pick back up under WOT?

 

Its a steady drop. It don't stay there the whole time as I'm shifting gears, but when it does drop, it drops for a few seconds until I shift or let off.

 

I copied this from the racetronix website.


Alternator-direct power for maximum voltage / True PnP with GM type connectors:

The Racetronix PnP upgrade harness provides alternator direct power for maximum pump voltage. Racetronix has documented an
average 1.2-1.5V increase in pump voltage in the C5 which equates to a 15-18% increase in pump volume based on Walbro's
specifications and Racetronix field tests. A minor increase in fuel pressure will actually be experienced with the installation of this
harness. The harness is fully 'plug & play' and can be installed without cutting into factory wiring. The entire harness is waterproof
made with the same Delphi interconnect components used throughout your C5. The harness' operation is quite simple. The factory
power wire which was once used to power the fuel pump is used to trigger a 40 amp-rated mil. spec. relay which in turn supplies
power directly from the alternator with fused protection. The harness is ultra-reliable which is why Racetronix provides a lifetime
warranty on parts and labor. All connections are crimped and soldered unlike the factory where they are only crimped. All wiring is
protected by high-temperature-rated Nylon looming. TXL and Teflon wires are used in all mission critical areas.