As the title states, will 550cc injectors safely support 300whp?
this is on a stock turbo'd GSR...

 

Yes. 450s are probably the lowest you can go for 300whp

 

Yes, i think even 450s are good for about 320whp. Correct me if i'm wrong.

 

RC Engineering has a fuel injector calculator to help you choose the right size injectors for yor set up. check out their website, its on there..

 

I checked the RC wibesite, using there calculator it recommends 697cc injectors. that seems a bit big, thats why I thought I would ask and see if anybody has so real home on exp.

 

I agree with above, 550's should be plenty good for 300whp and then some.

A long time back on my old setup with a bone stock sohc motor I was making 335whp on 450cc dsms maxed out.

 

yup, i make just shy of 300whp and i'm running 550s

 

So will I have enough room if I went 450's? keep in mind this will be on a stock motor GSR, 8-10 PSI from a T3/T4OB 50 trim.

 

Ive seen RC550s make 341whp with a single walbro, 93 oct. You're safe.

 

my 510cc r good enough for 375+hp so 550 should be plenty fine

 

I made over 300whp on 550s with ease...you'll be fine

 

450 will be good if your running only 8-10 psi, you can pick up some dsm 450 for like 50 bucks on craiglist.

 

Yes, 550cc injectors will allow you to make around 350 whp on pump gas.

 

So would it be a safe bet to pick up a set of 450's for my budget Turbo build?

 

Yes it would be safe to run 450 on 8-10 psi. As a matter of fact I have a set of 450 I don't use sitting in the garage. PM me if you want them.

 

PM sent...

 

Psi has nothing to do with it homie, 450's will support 300 WHEEL HORSEPOWER on premium pump gas. The size of his turbo (which was not stated) will determine how much psi it will take to reach 300 whp on his particular setup.

OP, either injector (450 OR 550) will do you fine. For future preference on these 4 cyl. motors, follow this formula (Courtesy of Shister66):

****cc (inj. size) x 4 (cyl.) = ****cc

****cc / 6 (cc per whp) = **** whp

This is calculated at around a 75% to 85% duty cycle.