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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Injectors?

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Old Dec 6, 2006 | 11:09 PM
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Default Injectors?
I have a forged piston, fully balanced 355,w hot cam and i want to know what is the stock injectors capable of i think i need more fuel? If so what size?
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Old Dec 6, 2006 | 11:36 PM
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stock might work if not 30lbs will get the job done. do some logging wtih datamaster if you have the ability and look at the duty cycle of the injectors. anything over 85-90% calls for bigger injectors.
Last edited by buffman; Dec 6, 2006 at 11:59 PM.
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Old Dec 6, 2006 | 11:55 PM
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Originally Posted by olegreen94
I have a forged piston, fully balanced 355,w hot cam and i want to know what is the stock injectors capable of i think i need more fuel? If so what size?

I have the same exact setup and am putting down numbers in sig. Have a high rpm miss and turns out my injectors can't keep up with my setup so I'm goin with Delphi/Racetronix 37#'s
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Old Dec 7, 2006 | 01:29 AM
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ive been doing this alot laterly but get some 42 thery are cheap, 275 brand new from HSW cant beat that
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Old Dec 7, 2006 | 07:27 PM
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I always used #30's and when I went with a bigger cam then went to #37 Racetronix peices.
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Old Dec 7, 2006 | 10:53 PM
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Ok so if i go with 30lb injectors i have a pcmforless tune will i have to get it tuned again or what will i need?

By the way Thanx for the info!
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Old Dec 7, 2006 | 11:17 PM
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you will have to have them make adjustments..
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Old Dec 8, 2006 | 06:09 AM
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Originally Posted by olegreen94
Ok so if i go with 30lb injectors i have a pcmforless tune will i have to get it tuned again or what will i need?

By the way Thanx for the info!

There is basically your PE (power enrichment table, your basic fuel map) then afterward there is a correction that you can do by a percentage. PCMforless will ball park it and make a across the board correction to run it safe.
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Old Dec 8, 2006 | 07:33 AM
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Originally Posted by BlackScreaminMachine
There is basically your PE (power enrichment table, your basic fuel map) then afterward there is a correction that you can do by a percentage. PCMforless will ball park it and make a across the board correction to run it safe.
What change are you making in the PE table? I would think that the percentage changes (scaling) would be done to the % Change to A/F (PE Table). Or, is it another table? The most important and drastic change made is the change to the injector flow rate in the ECM Constants.
Last edited by Sweetred95ta; Dec 8, 2006 at 07:47 AM.
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Old Dec 8, 2006 | 07:50 AM
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Stupid me, I assume people knew bout that since they would have tuning software, but that is certainly correct, that table ball parks it pretty good.
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