Injector Size
Injector Size Well, I am rounding up all the parts to finish out my Ai 200cc build. I need to buy some larger injectors than what I had. Last time at the dyno I made 378rwhp with my old setup and I maxed out my 30lb. Injectors and had to move the fuel pressure up to 55psi to get the air fuel down to 12.8-13.0. Hopefully with the new heads I can achieve about 50-60 more whp. What size injectors do you prefer for a often driven car and weekend warrior. I am thinking about running 37-42 pounders. What do you think?
He was using it on a 383, and with his past setup he had a duty cycle rating of near 94% and that was with the SVO'S so my suggestion would be to go with the 46 lbs. It has to be tuned anyways and if you plan on Juicing it, and I know you are 
then you won't be upset.
Demon I can understand how you are scratchin your head over that but you have to keep in mind that maybe his parts aren't as efficient as yours. Many variables play a role in that as you well know.
then you won't be upset.Demon I can understand how you are scratchin your head over that but you have to keep in mind that maybe his parts aren't as efficient as yours. Many variables play a role in that as you well know.
No, I am running a 255 in the tank and an Aeromotive fuel pressure regulator. I dunno why they were maxed out. I have seen alot of high hp numbers with these injectors. I just wanted to know what size injectors people were using with around 430-450whp.
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I know a guy with a 480rwhp car through an unlocked automatic that is using 30lbs SVOs, they go over 100% DC but still keep it fueled and he does not have the pressure jacked.
Do you have a hotwire kit on the fuel pump?
Do you have a hotwire kit on the fuel pump?
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Staging Lane
Joined: Mar 2007
Posts: 82
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From: NJ
I went from 30lb SVO (90+ DC, 18.5ms in hot weather) to 42lb Lucas. I did so to prepare it for a 100hp dry shot. Interestingly, the Lucas' seem to make the car run smoother and a bit cleaner at low rpms.
When I did my H/C, I left the stock injectors in and made 389 rwhp. Two years later I installed KooK's 1-7/8" headers, 3" dual cut-outs before the cats, a Street Twin clutch with the heavy steel flywheel (prior clutch setup had light weight aluminum) and 42lb Racetronix injectors.
After the tune I made 401 rwhp and the idle is now better than it ever was. I would suggest the 42's to anyone, zero idle issues and plenty of room to grow.
After the tune I made 401 rwhp and the idle is now better than it ever was. I would suggest the 42's to anyone, zero idle issues and plenty of room to grow.
Using the worksheet from the site above I entered 525hp at the crank, which would give you the ballpark that you are looking for. That came out to be 41.25. If you spray that will be at the limits so that is why I suggested the 46 lbs. Now keep in mind some brands flow higher than advertised, you need to find out the advertised flow rate and at what fuel presure they are advertised to run that at. Then choose accordingly.
What I bought was a Granantelli fuel pump kit. From what I can remember it came with all the stuff to install it and a harness I unplugged from the car and plugged right in to the new pump. Kinda like a plug and play gig.
Using the worksheet from the site above I entered 525hp at the crank, which would give you the ballpark that you are looking for. That came out to be 41.25. If you spray that will be at the limits so that is why I suggested the 46 lbs. Now keep in mind some brands flow higher than advertised, you need to find out the advertised flow rate and at what fuel presure they are advertised to run that at. Then choose accordingly.
Info ---> http://www.racetronix.com/621031FM.html
I am betting the harness you are refering too was a 6" little fine wire thing that goes in the tank. I am refering too a relay harness that gets power from the alternator and runs a larger gauge wire(maybe 10) to the back of the car to get proper voltage to the pump.
