Thats why I'm doing the tuning myself, I trust troyer and them, but I just want to do it myself, I'm tarded like that.

Well my thinking was, Cobras had 39lb injectors on a smaller motor making less power then what you make now. While a GT500 has a 5.4 with a little less power then what you make. I thought I was one upping myself by going GT500 injectors.

 

How are you doing your own tuning?

 

Do you have IM or Yahoo or anything? It would be easier on there

 

yahoo

eckomaninred

 

here is a site that will tell you what size injectors you need for the
hp you want. 2nd chart down is where you enter the size of the fuel injector to get the estimated hp.

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

 

So according to that, guys with 420-450RWHP who make about 525-550 at the crank are having 39lb cobra injectors go static at WOT.

Well assuming thats HP @ Crank and not ground. At ground 450RWHP is fine with 42lb injectors.

I would still recommend a bigger injector though, being as you should keep duty cycle at alteast 80.

 

Pretty important note. Just about any decent fuel pump can support 50 - 60 psi at the rail at those power levels. If you are going to go to bigger injectors then look for 55#'s as they would support nearly 700hp @ 80% duty cycle and 60 psi of fuel pressure. That is assuming you have a sufficient pump (and you do). I think you can get by with 39# injectors with enough fuel pressure. 55's would be very safe.

 

The only reason I'm sticking with the 39# cobra injectors is because I didn't know that the JDM fuel pumps were going to cost me $1500 and that the GT500 injectors wouldn't fit. But they will be upgraded in about a month, after I put this nice white 10lb bottle in the back of my truck Maybe I'll spray enough so my floor boards fall out....

 

Make sure its diamond plate floor board!

I dont see any Ford 55lb injectors, I ordered some 47lb from GT500.

 

In a Mustang with a manual you can get 470-525rwhp out of 39's before they give up at standard 39psi delta P. You can of course get some more overhead out of them by upping the delta P. Otherwise get yourself some 60lb injectors and you should be fine. Not sure what the drivetrain loss is like on these trucks but I am sure it is well above 20%.

 

I think drivetrain loss in the F150s is 18% or something crazy. With 300 Crank most put down about 210-230RWHP.

So if it makes stock 220 + 150HP from a whipple you get 370RWHP which is about right.

 

They aren't really Ford injectors. They are Bosch EV6 types and you can find 55# EV6's. Siemens Deka's are available in 55#, 60#, and 80# sets.

 

All the 55# ones I see are the wrong style. 04-08 requires pencil injectors. So I still dont see any that would work or im tarded lol.

 

Just got off the phone with my tuner. 463 RWHP at 14 pounds of boost. My truck ran out of turbo before it ran out of injectors. I get to go pick it up tomorrow. So..next step is a gt70 turbo, the nice white 10lb bottle sitting in my room, the troyer E-fans I'm waiting on, and some bigger injectors. I can wait to go drive it tomorrow

So I'm trying to figure out crank hp. Talked to my mechanic, who said my tuners dyno reads 10% lower than most others. What is our drivetrain loss on these mastodons? 15%? 20%?

 

Drivetrain loss is 26%.

you ran at 14lbs? how long will that hold?