I'm looking with a fellow Dutch NSX owner at a problem with the fuelpressure on a Comptech supercharger install.
NSX 1991 USA (imported).
Headers, flywheel, gears, exhaust, intake, sways, chairs.... wheels..... springs.......... shocks......................aso.
The FP at idle is approx. 50 PSI.
The voltage at the pump is approx 12.xx ~ 13.xx.
When the fuelpump resistor gets shorted out (at 4k RPM), the voltage goes up something like 0.1 volt (odd?, though not too low at 12V~13V, it would not get any higher then that).
When the boostswitch closes at 4K under full boost, the DC-DC converter commes in, and the voltage at the fuelpump is approx. 20-21 volt (thats ok.).
The weird thing is though, that the fuelpressure is not going any higher then 58 PSI, while we should have at least something like 85 to 90 PSI for this amount of over-pressure at the supercharger (measured approx. 0.4 bar ~ 6PSI).
This already costed the guy a pair of pistons, due to detonation, not knowing he was running lean.
So are we looking at a faulty fuelpump?
Reliefvalve in the fuelpump no good?
Fuelfilter no good?
Any other ideas?
The fuelpressure was meassured on the fuelfilter.
Mitch
NSX 1991 USA (imported).
Headers, flywheel, gears, exhaust, intake, sways, chairs.... wheels..... springs.......... shocks......................aso.
The FP at idle is approx. 50 PSI.
The voltage at the pump is approx 12.xx ~ 13.xx.
When the fuelpump resistor gets shorted out (at 4k RPM), the voltage goes up something like 0.1 volt (odd?, though not too low at 12V~13V, it would not get any higher then that).
When the boostswitch closes at 4K under full boost, the DC-DC converter commes in, and the voltage at the fuelpump is approx. 20-21 volt (thats ok.).
The weird thing is though, that the fuelpressure is not going any higher then 58 PSI, while we should have at least something like 85 to 90 PSI for this amount of over-pressure at the supercharger (measured approx. 0.4 bar ~ 6PSI).
This already costed the guy a pair of pistons, due to detonation, not knowing he was running lean.
So are we looking at a faulty fuelpump?
Reliefvalve in the fuelpump no good?
Fuelfilter no good?
Any other ideas?
The fuelpressure was meassured on the fuelfilter.
Mitch
