Fuel Reg Giving Problems On High Boost

[nizmokid]

Well got my car tuned yesterday and we had run into a problem with not getting enough fuel. using a Altronic SM4 ECU. we were hitting 95% on the injectors (nismo 555cc) around the 260rwkw, mark also have a Sard fuel pump in the car.

Anyway my mechanic said it is the Sard Fuel reg i have on the car was the problem. As he has seen this problem before on a WRX with a sard reg on it.

He over came the problem with a bosch fuel reg for a VL commodore on the WRX, and said the sard one wouldn't keep up or something along those lines.

so will be trying the standard one back on the car and see if that fixes the problem or do the bosch fuel reg upgrade....around $60-$80 mark.

any info on this problem would be great...........and calling out to Sydneykid for a answer!

[infected flow]

Well got my car tuned yesterday and we had run into a problem with not getting enough fuel. using a Altronic SM4 ECU. we were hitting 95% on the injectors (nismo 555cc) around the 260rwkw, mark also have a Sard fuel pump in the car.

Anyway my mechanic said it is the Sard Fuel reg i have on the car was the problem. As he has seen this problem before on a WRX with a sard reg on it.

He over came the problem with a bosch fuel reg for a VL commodore on the WRX, and said the sard one wouldn't keep up or something along those lines.

so will be trying the standard one back on the car and see if that fixes the problem or do the bosch fuel reg upgrade....around $60-$80 mark.

any info on this problem would be great...........and calling out to Sydneykid for a answer!

well im making more than that and i have a sard reg so i dont see that being the problem ...whats the fuel pump rated at ...?..your injectors are more than enough..i would check fuel pressure also ... and what are the a/f's at ..?

cheers

[Beer Baron]

i cannot possibly imagine it being the problem. a standard fuel reg will flow enough for that pump and those injectors. a sard one will too. you shouldn't need to be running pressure any higher than stock either. 555cc injectors are ample for 260rwkw as is the sard pump as is the sard reg.

my GTR is running 440cc injectors, nismo pump, stock reg and making 280rwkw with no problems appart from injectors very near their limit.

[nizmokid]

will be putting the standard back on Tuesday...so will keep you posted.

Edited November 24, 2006 by nizmokid

[mokompri]

what pump have you got ? its possible that the pump is running out of flow in the top end, so your getting a fuel pressure drop because of that, and the tuner is trying to compensate with high duty cycle on the injectors

[blk180]

I am using a Sard unit have had no problems so far 800cc, nismo pump and sard FPR. 1 bar 270awkws about 60% duty max. dead straight AFs when on boost.

[RB30-POWER]

had a fuel pressure and fuel flow guage on it on the dyno?

there is no guess work involved in pin pointing the problem, you don't have to try different parts, use the correct tools to begin with and save time, money and engines.

if your mechanic is guessing who have a bad mechanic/dyno tuner.