Fox T-Bird/Cougar Forums

Technical => Engine Tech => Topic started by: CougarSE on February 15, 2008, 08:11:27 PM

Title: Injector selection for this combo.
Post by: CougarSE on February 15, 2008, 08:11:27 PM
GT40 heads (non P, regular iron ones)
Exploder intake.
Trick flow Stage 1
A9L

19lbs or 24lbs?
Title: Injector selection for this combo.
Post by: V8Demon on February 15, 2008, 08:21:20 PM
OOOh....That's close!  You can go 19's without issue though.  How much pump we talkin?
Title: Injector selection for this combo.
Post by: grutinator on February 15, 2008, 08:23:43 PM
24's leave room for later mods.
but you could also get 19's and an adjustable fuel pressure regulator and crank up the pressure a lil.
Title: Injector selection for this combo.
Post by: CougarSE on February 15, 2008, 08:42:20 PM
190lph pump.  And after these mods that will be it.
Title: Injector selection for this combo.
Post by: TurboCoupe50 on February 15, 2008, 08:50:19 PM
Do it right, a set of 24s AND matching MAF...
Title: Injector selection for this combo.
Post by: CougarSE on February 15, 2008, 08:52:40 PM
So 24lbs and a matching maf is right?  Cause I have those..  and 19lbs and a matching maf...
Title: Injector selection for this combo.
Post by: TurboCoupe50 on February 15, 2008, 09:30:01 PM
You can use either, BUT if air flow exceeds the metering capability of the 19lb meter, it's going to lean out on the top end... With those heads and cam I'd say it's a possibility...

I run 24s and a 76mm Pro-M MAF...
Title: Injector selection for this combo.
Post by: V8Demon on February 15, 2008, 09:31:12 PM
By so close I meant either one.....To do it with more of a safety net go 24's.  You can leave them at stock pressure.

Quote
BUT if air flow exceeds the metering capability of the 19lb meter, it's going to lean out on the top end...


If anything....you'll run out of injector before that happens....I was running 19's @ 62 PSI.  The issue for me was going static due to 100% duty cycle.  Swapped the meter and injectors and found better gas mileage in the process.
Title: Injector selection for this combo.
Post by: CougarSE on February 16, 2008, 01:12:55 PM
I'll probably just try both.
Title: Injector selection for this combo.
Post by: Carpimp1987 on February 16, 2008, 02:39:10 PM
I would say 24s i got 30s now but thats good since i got a Vortech S-Trim laying around.
Title: Injector selection for this combo.
Post by: V8Demon on February 16, 2008, 02:48:28 PM
Lemme get this straight.

E-Cam ( I think I've voiced my opinion on Ford alphabat cams enough )
E7 heads
30 pound injectors

Overkill for what you currently have.....When do you FINALLY plan on putting that S-trim on and how much boost are you looking for?
Title: Injector selection for this combo.
Post by: Carpimp1987 on February 16, 2008, 05:09:16 PM
8psi for now should try to get it put on in next 2 months but i am going to save up for a new engine block and everything else so i am not putting any more money in my engine block later want to run 12-15PSI with some AFR 185s and Steeda Cam #20.

the injectors,MAF,holley system 2 with 1" spacer was $800 shipped to my house of ebay was on someones mustang and had less than 50 miles on all of it. plus i knew i was going to get a supercharger later on for it.
Title: Injector selection for this combo.
Post by: CougarSE on February 25, 2008, 02:48:19 PM
Ok so the waterpump is bad in the car so I guess now is the time to go ahead and start swapping parts. 

So far I guess this is what I'm gona do.

Stock H.O speed density cam.
GT40 heads
Explorer intake
65mm T/B
Typical headers/exhaust

Now can this run off of speed density and 19lb injectors?
Or do I need to MAF this thing and run 24lbers?
Title: Injector selection for this combo.
Post by: V8Demon on February 25, 2008, 03:19:06 PM
19's will be fine! ;)
Title: Injector selection for this combo.
Post by: CougarSE on February 25, 2008, 03:25:27 PM
Should I get an adjustable FPR for SD?  I have both injectors and a maf for either.  Hell I may run a maf with the 19lbers.
Title: Injector selection for this combo.
Post by: V8Demon on February 25, 2008, 04:12:09 PM
It won't hurt.  You can keep the stock pressure though.....You ARE changing the pump, right?
Title: Injector selection for this combo.
Post by: CougarSE on February 25, 2008, 05:13:42 PM
Yeah 190lph
Title: Injector selection for this combo.
Post by: thunderjet302 on February 26, 2008, 07:05:45 PM
Quote from: CougarSE;206213
Ok so the waterpump is bad in the car so I guess now is the time to go ahead and start swapping parts. 

So far I guess this is what I'm gona do.

Stock H.O speed density cam.
GT40 heads
Explorer intake
65mm T/B
Typical headers/exhaust

Now can this run off of speed density and 19lb injectors?
Or do I need to MAF this thing and run 24lbers?


I have GT40Ps and a higher lift cam (.533 lift) but the stock HO intake and TB. Runs fine with the stock fuel pressure. I'll find out how it runs with a Explorer intake soon;) . If you run what you have listed you should be fine. I'm pretty sure with that combo you should be making somewhere between 260-270 fwhp which is well within the range of the stock injectors.
Title: Injector selection for this combo.
Post by: Lightningbird on February 28, 2008, 04:56:02 PM
19's and the MAF w/ a FPR. Just tweek the Fuel Pressure until it is Stoich at WOT max engine speed. The computer will work best with this combination. 24's and MAF will still cause drivability issues unless chipped. If you plan on driving it every day and want a fun ride stick with the 19's. Do not go overboard until the 19's cannot support your HP level. Just add more fuel pressure. You should see 45lbs or so.
Title: Injector selection for this combo.
Post by: CougarSE on February 28, 2008, 05:06:59 PM
Cool thanks.  I picked up another clean set of 19lb injectors and a 70mm Junkyard maf.