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Unread 01-02-2008   #16 (permalink)
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Masshole made me laugh since after about the 3 or 4th reply, I was thinking the same thing. Therefore, I simply agree with Masshole.
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Unread 01-03-2008   #17 (permalink)
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Quote:
Originally Posted by FoxChassis View Post
What do you mean "rated at 345 HP"? As in that's the claimed HP by whomever sold it, and it has actually been measured by you?

Do you know what your engine's actual BSFC and injector duty cycle is at WOT?
I bought the motor from Ford Racing last year.
GT-40 b-303 cam rated at 345 flywheel hp

The second question, i really don't know.
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Unread 01-03-2008   #18 (permalink)
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Quote:
Originally Posted by Mustang_Crazy69 View Post
Thanks that helps alot im not sure what hp i will be at when putting gt-40 upper and lower with 70mm tb and spacer but im sure its getting close to the limit of the stock ones so i think i will change the 19 to 24 and maybe lower the fule pressure a little untill i get my gt-40 heads

I think you will be fine with 19# injectors. But after the head swap, you will need to go to 24#.
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Unread 01-03-2008   #19 (permalink)
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you don't want to run injectors at 100% for any length of time - if you run over 85% (even 100%) from 5,500-6,200 rpm then the time is not enough to damage the injector. If your going to run a dry notrous system, then 19s are out of the question.

My car runs 19s (Speed Density), makes 277RWHP and has no problems with the injectors.
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Unread 01-03-2008   #20 (permalink)
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Quote:
Originally Posted by 93mustang View Post
I bought the motor from Ford Racing last year.
GT-40 b-303 cam rated at 345 flywheel hp

The second question, i really don't know.
That is their CLAIMED rating, and using parts that they specify (Ford Racing induction kit, headers, 65mm throttle body). If you don't use the exact same parts that they specify all bets are off. And even if you do, the HP that you get is not guaranteed to be the HP they claim it should make.
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Unread 01-03-2008   #21 (permalink)
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Quote:
Originally Posted by tmoss View Post
you don't want to run injectors at 100% for any length of time - if you run over 85% (even 100%) from 5,500-6,200 rpm then the time is not enough to damage the injector. If your going to run a dry notrous system, then 19s are out of the question.

My car runs 19s (Speed Density), makes 277RWHP and has no problems with the injectors.
But what is your engine's BSFC, and what is the static fuel pressure?
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Unread 01-03-2008   #22 (permalink)
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Quote:
Originally Posted by FoxChassis View Post
But what is your engine's BSFC, and what is the static fuel pressure?

an engine dyno with the equipment is the only way I know of to get that and I didn't do it. Use .45-.50 I guess. My fuel pressure is at 42#. imo you can run up to 44# before you should consider steping up to new injectors. It's not an option for me with SD and no chip.
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Unread 01-03-2008   #23 (permalink)
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I read in a magazine that the 93 cobra with the factory gt40 mods has the 24# injectors for the low rating of 235hp that it produced but the story stated that the engine really did not need injectors of this size all the time but at points the 19# injectors from the stock 5.0 may be overworked in the 93 cobra but 24# injectors were almost overkill. Everyone knows with the proper rating of the 93 cobra that it was closer to making 250-260hp so it seems that 240-245hp might be a safe max hp on the 19# injectors. Just something I read.
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Unread 01-03-2008   #24 (permalink)
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Quote:
Originally Posted by FoxChassis View Post
That is their CLAIMED rating, and using parts that they specify (Ford Racing induction kit, headers, 65mm throttle body). If you don't use the exact same parts that they specify all bets are off. And even if you do, the HP that you get is not guaranteed to be the HP they claim it should make.
That's right. I believe they rate the horse power at the flywheel with no drivetrain losses or accessories.
So is 39 psi fuel pressure with 24 lb injectors good or should I bump up the fuel pressure some. I just want to make sure that I'm not running lean.
Thanks for all the help!


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