383 stroker injector help
Melting Slicks
Joined: Oct 2000
Posts: 3,426
Likes: 4
From: Heidelberg PA
Cruise-In V Veteran
What year? What will you be using the car for?
Autocross or road racing - go with higher # injector.
But for general use I use the following:
### Listen to your tuner first there may be a preference #####
If MAF - 24# Ford racing injectors w/ Holley adjustable fuel pressure regulator.
If Speed density - 24# may not be enough.
Injector use is a two edge sword - some say that my engine 383 cannot run good on 24# Ford injectors. But how many 383's that you know of can run on the street and run 10's at the strip and I am using the 85 original ecm and until we have cold great weather I am running slightly rich.
PS - don't be supprised if this thread gets spirited w/ opinions -
Autocross or road racing - go with higher # injector.
But for general use I use the following:
### Listen to your tuner first there may be a preference #####
If MAF - 24# Ford racing injectors w/ Holley adjustable fuel pressure regulator.
If Speed density - 24# may not be enough.
Injector use is a two edge sword - some say that my engine 383 cannot run good on 24# Ford injectors. But how many 383's that you know of can run on the street and run 10's at the strip and I am using the 85 original ecm and until we have cold great weather I am running slightly rich.
PS - don't be supprised if this thread gets spirited w/ opinions -
Last edited by 85vet; Oct 11, 2006 at 11:44 AM.
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
NA 388 LT4 and am running Siemens #60 lb injectors. I've learned its not what # they are.. its the fine print and specs that determine how good the injector is and how well it can control. 
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
First and foremost, use what your tuner suggest.
That aside there was a letter written in corvette fever, this month about injector sizing. Basically the answer was, its not really engine size etc. that dictates injector size. Its your horsepower output.
For what its worth, I am running stock injectors, but according to Alvin, I am starting to go lean on top end. He suggested I go with the ford 30lb injectors and that would give me some growing room as well.
Edit to add this link for you to look at. http://forums.corvetteforum.com/show...=injector+size Read the last post on it for a better understanding on injector sizing.
That aside there was a letter written in corvette fever, this month about injector sizing. Basically the answer was, its not really engine size etc. that dictates injector size. Its your horsepower output.
For what its worth, I am running stock injectors, but according to Alvin, I am starting to go lean on top end. He suggested I go with the ford 30lb injectors and that would give me some growing room as well.
Edit to add this link for you to look at. http://forums.corvetteforum.com/show...=injector+size Read the last post on it for a better understanding on injector sizing.
Last edited by 93 ragtop; Oct 12, 2006 at 05:39 AM.
Racer
Joined: Sep 2000
Posts: 325
Likes: 0
From: Chicago IL
No guess work required, just some Math:
http://www.rceng.com/technical.htm#WORKSHEET
Plug in your numbers, and the recommended injector size is calculated for you. FYI, I run 30lb SVO injectors and they are at 80% DC at 6200 RPM where my peak HP occurs.
Jimmy
http://www.rceng.com/technical.htm#WORKSHEET
Plug in your numbers, and the recommended injector size is calculated for you. FYI, I run 30lb SVO injectors and they are at 80% DC at 6200 RPM where my peak HP occurs.
Jimmy
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Advanced
Joined: Aug 2002
Posts: 99
Likes: 0
From: Lake Jackson TX
I'm running a self built 383 LT1.
30 lb/hr injectors here. With the 24lb injectors the Duty Cycle was maxing out above 85% (which is wide open from an injectors standpoint).
With the 30's im in the 70s DC under WOT. 30# for the win!
i run 11.9s at 117mph and it is an every day driver.
If you're a TPI car then you might be able to use the 24#s since they are restricted on air/horsepower. I'm buzzing my motor to 6500RPM.
30 lb/hr injectors here. With the 24lb injectors the Duty Cycle was maxing out above 85% (which is wide open from an injectors standpoint).
With the 30's im in the 70s DC under WOT. 30# for the win!
i run 11.9s at 117mph and it is an every day driver.
If you're a TPI car then you might be able to use the 24#s since they are restricted on air/horsepower. I'm buzzing my motor to 6500RPM.
Last edited by FastVette94; Oct 12, 2006 at 08:31 AM.
Pro
Joined: Oct 2004
Posts: 628
Likes: 5
Originally Posted by DieL
NA 388 LT4 and am running Siemens #60 lb injectors. I've learned its not what # they are.. its the fine print and specs that determine how good the injector is and how well it can control.
