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Fuel System Selection

iloveboost

Proven Member
46
1
Jul 25, 2014
Vacaville, California
I have a couple of questions regarding upgrading my fuel system on my 99 GST.

I am planning on going with a Walbro 450, FIC1120s, and AEM FPR.

Is is possible to have too big an injector? If I used a bigger injector, could I dial back? Can I make those 1120s act like the stock 450s for smog? Is it a case where big is always better just as long as the fuel pump can handle it? I am planning on running a flash for E85, Pump, a lower boost setup for my son, and one for CA smog. These will be coupled with an HTA68 and supporting mods. I understand how to select the right system components to make the most power, just not sure what happens when I try and dial it back. Any insight would help.

Also, do I need a high flow fuel rail for this system?

Thank you!
 

djc1827

Proven Member
34
0
Feb 8, 2013
Liverpool, New_York
Walbro 450 is fine and def stick with brand FIC, go with a diff brand FPR. You will use about 6-700cc of inj and about 8-900cc on e85 hi boost. Aero 340lph would work will too. You don't need fuel rails hta68 is still small
 

XFinisher

Probationary Member
23
1
Nov 13, 2014
independence, Missouri
Is is possible to have too big an injector? If I used a bigger injector, could I dial back? Can I make those 1120s act like the stock 450s for smog?

Essentially you can but it comes down to efficiency, in theory you want your injectors to be maxed out at full power(Peak power). Now if this were just a drag car its not really a big deal but on a street or daily car I wouldn't recommend it, if you had 1000CC injectors and were 90% of the time only using 20% of their duty cycle that's not exactly efficient. The best thing you can do is calculate the smallest injector for your build and run that. Here is a nice little calculator to help you do that;).

http://www.promracing.com/injector.php/
 
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