injector size and fuel pump???

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May 22, 2010 | 04:50 AM

patricksmithahhh

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Instructor

Joined: Feb 2010

Posts: 234

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From: las vegas nevada

injector size and fuel pump???

do i need a new fuel pump for my turbo build on my 90 vette???stock bolt ons with a turbo at 5-7psi
i want to know if i need a bigger fuel pump and what size injectors i should go with

thanks

May 22, 2010 | 12:10 PM

jsiddall

Racer

Joined: Aug 2009

Posts: 337

Likes: 6

From: Kanata ON

Quote:

Originally Posted by patricksmithahhh

do i need a new fuel pump for my turbo build on my 90 vette???stock bolt ons with a turbo at 5-7psi
i want to know if i need a bigger fuel pump and what size injectors i should go with

thanks

If you want to make more than about 350 HP or want to use E85 then yes. IIRC the stock injectors run at about 70% PW at WOT on a stock engine. Not much headroom there. Increasing the fuel pressure might buy you a bit but you are not going to go far.

I opted for a Walbro 255 l/hr intank. Should be good for way more flow than an L98 would ever need.

For injector sizing, ballpark math says take your new HP divide by stock HP and multiply your stock injector size by that number to come up with your new injector size.

Last edited by jsiddall; May 22, 2010 at 12:33 PM. Reason: Added fuel pump info

May 22, 2010 | 01:43 PM

patricksmithahhh

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Instructor

Joined: Feb 2010

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From: las vegas nevada

so that would mean roughly 30# injectors shold be alright???

May 24, 2010 | 09:02 AM

BlowerWorks

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Joined: Oct 2004

Posts: 761

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Run a matched set of 42's or 60's. Work great. Obviously U need a new .bin. Also consider the Moates.net "Ostrich" and my new MAF sensor.

BR - greg

PS: almost forgot - go with the GSS-340M by Racetronix

Last edited by BlowerWorks; May 24, 2010 at 09:03 AM. Reason: Added the pump

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