And you thought a Supra pump would overrun the stock FPR....

[Unlogic]

There seems to be a lot of fuel pump, fpr and voltage regulation knowledge in this thread.

Whats the simplest and most less intrusive way to ensure that there is enough fuel for a set of 560cc injectors on our cars?

[mb3000]

Enough fuel? Hotwired Walbro 255lph would be the easiest.

[TurboSinceBirth]

I've got my ARC2 pegged right now trying to compensate for the extra psi at idle, if only I had one more click

Adjust the low more negative and add more positive to the accel. They're both dependent on each other. You can get more adjustment out of it while still maintaining a good cruising AFR and idle AFR.

[mb3000]

Yeah, my accel is maxxed. Only way to get good idle & cruise with my setup.

[TurboSinceBirth]

Yeah, my accel is maxxed. Only way to get good idle & cruise with my setup.

It shouldn't be. I've set one up on 8-9 cars and always stayed at +1 to +3 on the accel no matter what size injectors. Any vacuum leaks will cause problems too.

[Chris@Rvengeperformance]

I'm running the walbro 416 on the stock fpr (new one though) and didn't even notice any tuning issues. That is with 1050 cc injectors on pump 93 for a while. If you have any resolution with your tuning device it doesn't matter a whole lot.

Running the pump at lower voltage may help the pump life though. I'm just not willing to hackup the stock fuel system unless it was absolutely necessary.

[Unlogic]

I'm just not willing to hackup the stock fuel system unless it was absolutely necessary.

Thats the same thing I was thinking about when I asked this question a few posts up.

Whats the simplest and most less intrusive way to ensure that there is enough fuel for a set of 560cc injectors on our cars?

[RealMcCoy]

In my humble opinion all you guys running big amp draw pumps on tiny stock wiring are just asking to let the smoke out....

[mb3000]

It shouldn't be. I've set one up on 8-9 cars and always stayed at +1 to +3 on the accel no matter what size injectors. Any vacuum leaks will cause problems too.

Minor rear turbo O ring leak past 25psi, other than that the system is 100% sealed. I used to do the same +1-3, however i couldn't get perfect 14.7 cruising. The way I have it now, -1, -7, 7, 16 allows me to achieve ~ 14.7 when cruising and idle. If I do the typical ACCEl setup I run 3, -7, 7, 1. This puts me in the 12 &13's when running around on the interstate. Not acceptable IMO.

[Jimvr4]

In my humble opinion all you guys running big amp draw pumps on tiny stock wiring are just asking to let the smoke out....

Really, why? Stock wiring is dropping only 1 volt or so. Stock wiring is 16 awg which is .004 ohms per foot. Yes you can drop a couple of watts of power across the wire but that's over many feet.