Fuel Injector Chart???? - Forums at Modded Mustangs
 
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post #1 of 8 Old May 10th, 2011, 03:52 PM Thread Starter
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Fuel Injector Chart????

Searched and searched, does anyone have the fuel injector chart that pertains to n/a, boosted, and nitrous applications??



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post #2 of 8 Old May 10th, 2011, 03:56 PM
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Ford Fuel Injection Injectors

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post #3 of 8 Old May 10th, 2011, 06:11 PM
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Here's a photo comparison of some Ford injectors:



And some "rule-of-thumb" sizing information:



In this chart the injector "size" in lb/h is assume to be the actual flow rate at 40psi. FRPP injectors are rated at 40psi, however the industry standard rating pressure is 43.5 psi (3.0bar).

To derate injectors rated at 43.5psi for 40psi use this formula:


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post #4 of 8 Old May 10th, 2011, 09:34 PM
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This is interesting. According to SCT the 21# injector was never used in a 96-04 Mustang 4.6l engine.


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post #5 of 8 Old May 10th, 2011, 10:49 PM
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Quote:
Originally Posted by JayC View Post
This is interesting. According to SCT the 21# injector was never used in a 96-04 Mustang 4.6l engine.
Then SCT is misinformed, my '03 had (I am running the FRPP M-9593-AA302 24lb/h units now) the "pink" injectors as do all very late '02 through '04 MY cars.

The Ford number is FOTE-9F593-D9B, Bosch 280-150-561, rated 22lb/h at 43.5psi, 21.1lb/h at 40psi--(40/43.5)^.5 * 22 = 21.1...

Here's a photo of one taken just now:




[edit]

They may be basing their assessment on the low and high injector slopes in the tunes--Ford did not alter those settings in tha later tunes that I have observed. This is why the late '02 through '04 models run pig-rich at WOT, with AFR often dipping into the low 11's (11.2:1 or richer) at high load and WOT.

With the 21s I had to set the low and high slopes to 24.10 and 20.50 respectively (from 23.76 and 19.15 in the stock tune) to get the fuel trims in order and stop it from going rich at WOT.

Most canned tunes lean out the mix in the Stabilised Open Loop Fuel table for this same reason.

[/edit]

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SOLD! - 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat,
PP 70mm TB & plenum, Ralco RZ_flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

new ride - 1998 SL500, 5.0L 32V 326/347 HP/tq

Last edited by cliffyk; May 10th, 2011 at 10:59 PM.
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post #6 of 8 Old May 11th, 2011, 07:46 AM Thread Starter
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post #7 of 8 Old May 11th, 2011, 10:37 AM
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Those Max hp figures. Is that crank HP or Wheel? Because Alot of us are right around 310hp at the crank...


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post #8 of 8 Old May 11th, 2011, 11:22 AM
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Quote:
Originally Posted by therat1989 View Post
Those Max hp figures. Is that crank HP or Wheel? Because Alot of us are right around 310hp at the crank...
Those are flywheel numbers, at 75% and 85% duty cycle and a constant 40psi pressure differential across the injectors--as it the case with the returnless fuel delivery system used in the '99 and up models.

How are you determining the "right around 310hp at the crank"?

I suspect it is from applying some guesstimated drive train loss (15% is often used) to observed rwHP numbers? The problem with that is that it is not an accurate number, just a reasonable guess.

At 310fwHP, running n/a, the stock 19lb/h injectors (at 40psi) would be operating at 100% duty cycle (static)--however bump the pressure up to 50 psi and they would be running at 90% duty cycle.

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My Mustang
SOLD! - 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat,
PP 70mm TB & plenum, Ralco RZ_flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

new ride - 1998 SL500, 5.0L 32V 326/347 HP/tq
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