C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What size injectors do I need?

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Old Jan 27, 2002 | 08:38 PM
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Default What size injectors do I need?

For a '86 TPI 383, plan to add N2O later on. Will 30lbs injectors be too large?
What size did the '86 come with? What about a '91?
Thanks
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Old Jan 27, 2002 | 09:04 PM
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Default Re: What size injectors do I need? (Thad)

No, 30# shouldn't be too large. I just got done putting 30#'s in mine and I'm not going to be adding nitrous. You might need more than 30# because you will have to add more fuel to level out the AFR with the nitrous...
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Old Jan 27, 2002 | 09:47 PM
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Default Re: What size injectors do I need? (Thad)

A quick note about adding N2O. If you are planning on doing a dry system the fuel comes through the injectors, if you are going with a wet system the fuel gets thrown through your intake. I looked into getting one this winter, but my distributor went bad and I'm using the money to fix that and a few other things that go along easily with it. Check out nitrouswarehouse.com I called the guy one sunday morning and bs with him for quite a while, he knows his stuff.
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Old Jan 27, 2002 | 10:28 PM
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Default Re: What size injectors do I need? (Glock'94)

Well, I would also be installing a higher flow fuel pump with the Nitrous install just curious about the 30lbs injectors.

Anyone know what size originally came in a late model '86 and a '91?
:cheers:
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Old Jan 27, 2002 | 10:55 PM
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Default Re: What size injectors do I need? (Thad)

Hi Thad,

I believe the stock injectors are 19 pounders.

Joe
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Old Jan 28, 2002 | 09:24 AM
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Default Re: What size injectors do I need? (stuntman)

Actually, I think the 86's were closer to 22 lb/hr. The 85's used a 24 lb/hr injector. As a rule of thumb, it take 0.5 lb of fuel per horsepower per hour. So 30 lb/hr injectors could theoritically support (30)x8/(.5) = 480 hp. But that would be at 100% duty cycle. You don't want to run at 100% duty cycle, though. If you run at 80%, then 30 lb/hr injectors could support 384 hp.
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