which injector size

oosoosloo · 11-04-2002, 06:56 AM

should I used a 550 or 625 injector for my set-up.
here are my current mods:
14b for now this will change to b16g (reason I need opinion on injector size)
fmic
1g bov
uicp
upgrade fuel pump
stage 4 clutch
boost controller
3 inch turbo back
high flow cat
mushroom intake
8.5 plug wire
bpr7es gap @ .29

jw · 11-04-2002, 08:54 AM

550s look good for what you are going to run.

candela · 11-04-2002, 10:22 AM

550s are fine for me, and we have very similar setups

pneumo · 11-04-2002, 11:36 PM

Are those the 625's that Hahn Racecraft sells? Those are actually 550's that are rated for running higher duty cycles, so the tuning and the AFC adjustments will be the same as the 550's. You can get more fuel out of them if you push it, but you won't benefit from any lower airflow signal at the mas, which is what you get with injectors that are actually bigger. I guess you know that you'll need some sort of fuel control with them? Go with the 550's.

oosoosloo · 11-05-2002, 12:18 AM

thanks for the response.
pneumo - yup those are the hrc 625 injector.
550 here I come. so as afc

Black_90TSI · 11-06-2002, 02:54 AM

With my setup now I have 550's. My egt's start getting up there in 3rd and 4th, I would recommend 660's. Those are going to leave you more room to tune your car w/. Just my opinion.