Larz

After installing an aftermarket fuel pump, such as the one offered by RP, do I need to retune the car? Or will the new pump operate at stock levels until an aftermarket ECU tells it otherwise?

Mahjik

iTrader: (1)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/im-almost-sure-my-fuel-system-cause-my-problems-347920/

Larz

Thanks. I did a search, but got more reading than war and peace, so I went through some threads and decided to post the topic. So the next question is: how do I calculate which fuel pumps will pump out too much? I believe the RP pump was higher flow than the walboro, so it looks like that one is out unless I want to retune the car right after.

T-88 Monster

Are you using the stock ECU ?

Larz

Yes. Currently.

adam c

iTrader: (2)

If you don't tell us what mods you plan, no one can tell you what pump to get.

Larz

Just some base mods is what I have now, like exhaust and intake. However I'd like to get effini twins in the future, and up the boost. I just wanted to know if I could install something now, in preperation for later.

Black97VR4

I *think* having an aftermarket fuel pump won't require any tuning assuming everything else in the fuel system is stock. So no, I don't beleive you will have any problems running it. You might run slightly rich at idle but that's nothing too serious.

Snook

iTrader: (12)

I used a supra pump with my pettit ecu on my last RX and didn't notice any changes when I switched them out.

PVerdieck

I did a a supra on mine, didn't do anything else. No problem.

Larz

Okay, thanks for the replies.

Scrapiron7

I ran the Denso fuel pump for 2 years on a remapped ECU with no problems at all.

tiger18

iTrader: (1)

Surely theres no need for an uprated fuel pump until the stock fuel system cant cope( ie not enough fuel to air ratio),,,, swapping a new uprated pump wont change anything as the fuel system pressure is governed by the fuel pressure regulator.. , it wont make no difference if the pump is pumping 50 /100 / 150 psi if the regulator is maintaing a constant 35psi.
sure if you going for power then bigger injectors controlled by a power FC would be the way forward.