LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

what injectors and fuel pump do i need

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Old Mar 24, 2005 | 07:37 PM
  #1  
krazedz28's Avatar
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what injectors and fuel pump do i need

i have an lt1 stroked to a 383 and i think i have fuel problems, it spits and sputters when u ease on to the gas, stoke injectors and fuel pump in the car now, what do u guys think i should get.
Old Mar 24, 2005 | 10:01 PM
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Kataklysm's Avatar
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Re: what injectors and fuel pump do i need

I think 30# should be alright, maybe even 28#...anything that flows more then the stock pump should work out alright. Don't need the best one but don't want the worst one either.
Old Mar 25, 2005 | 08:04 AM
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Re: what injectors and fuel pump do i need

I'm running a 383 right now and everyone has told me I need at least 36lbs. injectors. I have 30# right now and at wide open throttle my inj DC was at a high 70% with my old heads and cam. You dont want any more than 80% duty cycle and to some thats even too high. I would recommend 36# and I hear racetronix makes a very nice plug and play 255lph fuel pump. Thats hat Im going with when mine dies. If it ever does....160,000 and still kicking. Knock on wood

Last edited by wicked_95z; Mar 25, 2005 at 08:07 AM.
Old Mar 25, 2005 | 08:35 AM
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Re: what injectors and fuel pump do i need

Definitely get a Racetronix, and I would say 42's...its better to go to big then to small...in case you add anything else in the future.

I would think you could really screw up your car running stock inj/fuel pump...I'd be easy on it.
Old Mar 25, 2005 | 12:05 PM
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Re: what injectors and fuel pump do i need

would a bent push rod also cause the similar problems or no
Old Mar 25, 2005 | 12:11 PM
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Re: what injectors and fuel pump do i need

Get a fuel pressure guage and check your fuel pressure at WOT. Do you have any way to scan the car?

36# and a 255lph pump would be fine with your setup.
Old Mar 25, 2005 | 01:50 PM
  #7  
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Re: what injectors and fuel pump do i need

i tried to scan it but my car is a 95 with an obd1 computer with an obd2 plug and i hooked it up but it said it couldnt connect
Old Mar 25, 2005 | 02:00 PM
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Re: what injectors and fuel pump do i need

Is that on stock heads? Are you planning to do a heads/cam combo? If so I would say 42#ers so you can do more upgrades. Also the racetronix 255 w/plug and play seems to be a very nice part.

edit: I think racetronixs' 36 and 42# injectors are the same price.

Last edited by ajschult; Mar 25, 2005 at 02:11 PM.
Old Mar 26, 2005 | 12:03 PM
  #9  
krazedz28's Avatar
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Re: what injectors and fuel pump do i need

it is stock lt1 aluminum heads but they have been ported and polished and its got a big cam no more motor work just trying to get it ruin good just mostly suspension now
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