What injector size do I need?
10-15-2009, 06:01 PM
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What injector size do I need? Tring to gather some parts to put my rag back togather. I currently have accell 36 Lb injectors. Im going to be running a stand alone direct port system, Solid roller cam(Not sure on the specs yet) TEa stage 2 heads, stock intake, 383 with Roughly a 12:1 compression ratio. Hoping it will make somewwhere around 475ish N/A, Any suggestions?
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just put the 42s and call it the day 
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10-16-2009, 10:25 PM
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I was thinking 42 lb as well, As far as the duty cycle with the old setup its been so long I cant remember. Any chance in hell that the 36's I have will work for it? If not Ill start loking for a good set.
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10-17-2009, 09:03 AM
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Flywheel HP x 0.07 = #/HR
This formula takes into consideration the injector working at 85% duty cycle.
I assume if you are going direct port then you will have an independent fuel delivery system for nitrous. If that is the case then fuel injector size has no bearing.
If you go with 42's that should be plenty as long as the PCM is tuned for them.
This formula takes into consideration the injector working at 85% duty cycle.
I assume if you are going direct port then you will have an independent fuel delivery system for nitrous. If that is the case then fuel injector size has no bearing.
If you go with 42's that should be plenty as long as the PCM is tuned for them.
10-17-2009, 09:29 AM
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Flywheel HP x 0.07 = #/HR
This formula takes into consideration the injector working at 85% duty cycle.
I assume if you are going direct port then you will have an independent fuel delivery system for nitrous. If that is the case then fuel injector size has no bearing.
If you go with 42's that should be plenty as long as the PCM is tuned for them.
This formula takes into consideration the injector working at 85% duty cycle.
I assume if you are going direct port then you will have an independent fuel delivery system for nitrous. If that is the case then fuel injector size has no bearing.
If you go with 42's that should be plenty as long as the PCM is tuned for them.
Why would he need 42's?
Seems like when I first got into the LT1 world, people were swapping out for 30# SVO's, Now people with the same setups seem to need 40+ injectors to run the same numbers people were running back in '03
Just askin'
I'd log some time with the 36's and see what your duty cycle is and go from there.
10-17-2009, 10:26 AM
#16
475*.07=33.25
Why would he need 42's?
Seems like when I first got into the LT1 world, people were swapping out for 30# SVO's, Now people with the same setups seem to need 40+ injectors to run the same numbers people were running back in '03
Just askin'
I'd log some time with the 36's and see what your duty cycle is and go from there.
Why would he need 42's?
Seems like when I first got into the LT1 world, people were swapping out for 30# SVO's, Now people with the same setups seem to need 40+ injectors to run the same numbers people were running back in '03
Just askin'
I'd log some time with the 36's and see what your duty cycle is and go from there.
10-17-2009, 10:33 AM
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Not saying he would. It is unclear if the 475hp goal is flywheel or wheel hp. What I am trying to say is even if the demand does not require 42lb injectors the PCM can compensate the pulse width for those injectors if tuned properly.
I agree as far as those using too large of an injector for their application, but again, doesn't hurt anything. I was running stock 24lb/hr injectors putting out 370rwhp and did so for more than 70K miles with no fuel issues.
I agree as far as those using too large of an injector for their application, but again, doesn't hurt anything. I was running stock 24lb/hr injectors putting out 370rwhp and did so for more than 70K miles with no fuel issues.
10-17-2009, 11:12 AM
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This site calculated a 37.3# injector at 80% DC
Not trying to start anything, and I fully understand that a properly tuned pcm can deal with oversize on the injector, it's just that in the last few years every one seems to think that bigger is better.
Last edited by Michigan Skip; 10-17-2009 at 11:18 AM.
10-17-2009, 11:19 AM
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Not saying he would. It is unclear if the 475hp goal is flywheel or wheel hp. What I am trying to say is even if the demand does not require 42lb injectors the PCM can compensate the pulse width for those injectors if tuned properly.
I agree as far as those using too large of an injector for their application, but again, doesn't hurt anything. I was running stock 24lb/hr injectors putting out 370rwhp and did so for more than 70K miles with no fuel issues.
I agree as far as those using too large of an injector for their application, but again, doesn't hurt anything. I was running stock 24lb/hr injectors putting out 370rwhp and did so for more than 70K miles with no fuel issues.