ponyboy88

okay looking to do an engine swap, it'll consist of:
a gt40 crate engine from ford which has gt40 heads, e303 cam and approx.9:1 compression, running it with a typhoon or cobra intake and 70mm throttle body

question is, am i going to be able to run that reusing my stock injectors and fuel rails, and if not will 24lb injectors suffice???

if i change injectors, that means i have to swap MAF and ECM, right???

i know this crate engine isnt the best for h.p and ill only be pushing 300 at the wheels but my mustang does 5-600 miles a week and cant go to radical

thanks, NA

Joel5.0

300 at the wheels ~ 360 at the flywheel

Using the formula: Injector size = (HP x BSFC) / (number in injectors x duty cycle) ....BSFC = .5 for N/A and duty cycle = .8

360 HP will require 28.125# injectors..... or 30#, which is the closest + a MAF calibrated for 30# injectors.... the ECM will not require to be replaced.

-OR-

Bigger ID MAF + tuner (Tweecer, Moates)

-OR-

Bigger ID MAF + Tune chip

ponyboy88

so if i go with a 75mm MAF and a tuner chip i can get away with stock injectors??? that seems odd,

just trying to put this alltogether on paper to see if i can do it in august...

i imagine going with the 30lb injectors and a 75mm throttle body would be the way to go, just in case i change anything down the road


any comments on the engine/engine set up

Rajun_Cajun

I seriously doubt you will be at 300 to the wheels with a Ford crate motor. Those motors are rated hp at the flywheel.




I am at 280 hp to the wheels, and I am still running the 19s. 19s will support up 300hp, and 24s will support up to 350hp.

Joel5.0

No..... the injectors size would be the same on the alternatives listed, which is 30#.

Rajun_Cajun

P.S



I have a Granatelli MAF sonsor and housing for slae if interested!

Its calibrated for 19s.

Rajun_Cajun