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?

 

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

 

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.

 

Are you using the stock ECU ?

 

Yes. Currently.

 

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

 

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.

 

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.

 

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

 

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

 

Okay, thanks for the replies.

 

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

 

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.