How much power can the stock G50 fuel pump handle?

[G50 Q]

I know some of you guys are running high HP VH's just curious if you are running a stock pump. If not what power level did it need to be replaced?

Thanks!

[maxnix]

First, it's a 3 stage pump, so tough to replace and retain function for the street.

Read Q45tech' old posts. I think the margin is about 30%.

[G50 Q]

Thanks for the tip.

I'm not sure I understand why replaceing the fuel pump with a single rate pump would effect driveability on the street? You could even retain the FPECU and replace with a high flowing unit. Although, with a proper return system I'm not sure why you would want to keep the OEM FPECU.

I'll keep reading on the subject

As far as HP is concerned, you're saying roughly 400whp is the limit?

[maxnix]

I would say safely. Remember you cannot use up all that 30% margin. The three stage is necessary for idle and cruise besides WOT/start up.

Search and read all of Q45tech's posts. I believe InfinitiGuy has a link to them in google docs. Many will be in General Chat as they were in Infiniti General in the beginning..

[G50 Q]

I guess I should have specified in my reply, that I will not be using the pump in conjunction with the VH, rather a 2JZ. If I'm not mistaken, they have a single rate pump from the factory. So, bypassing the FPECU may be just as well.

I will def do some more research on the older posts! Thanks Again!

[Q451990]

I would certainly match my fuel pump to the engine. Unless your existing pump is new or nearly new, I don't think you'd be saving much by keeping it and running it on high...

Heath

[G50 Q]

Yea, I'm thinking it should be replaced anyway just based on HP figures. We plan on making ~450-500WHP with it, so the stock pump probably won't cut it.

Car should be running in about a week!!

[Q451990]

Can't wait to see it!

Heath

[maxnix]

2Jz is a whole 'nother deal. Gotta love cast iron blocks.


Might want to peruse Sijokos posts before you go down that route.

[G50 Q]

Which route? I couldn't find any posts by Sijokos?

[elwesso]

The stock Q pump is the same as Z32 TT so whatever HP they are running you should be good.. I would say its good for at least 600HP, but I don't remember off hand.

[G50 Q]

Oh! Well that is good news then.. haha

I knew the Z32TT was a 3 stage pump too.. should have put two and two together... haha Well, now I'll just keep my fingers crossed that it doesn't crap out.