Injector/fuel pump question

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09-16-2015, 09:41 PM

rubyred88

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Car: 88IROC Vert

Engine: ZZ383

Transmission: 700R4

Injector/fuel pump question

I have a ZZ383 in an 88 IROC that runs great. Talented local tuner and Holly Commander have the EFI working fabulous. During a final road tune the 30# injectors were at 115% of duty cycle with the stock fuel pump. With that said, IF i go to bigger injectors (I'm thinking 36#-42#), would I need to upgrade to a higher capacity fuel pump to go along with the injectors? Thanks

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09-17-2015, 01:00 PM

aliceempire

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Car: 92 Firebird, 77 Trans Am SE, 86 Z28

Engine: 5.7 HSR, T/A 6.6, empty

Transmission: T-5, TH350, T-5

Axle/Gears: 3.08 posi, 3.23 posi, 3.23

Re: Injector/fuel pump question

115% duty cycle? http://injector-rehab.com/shop/idc.html

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09-17-2015, 01:06 PM

rubyred88

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Car: 88IROC Vert

Engine: ZZ383

Transmission: 700R4

Re: Injector/fuel pump question

You are correct. Mine is a calculated number of injector open time versus rpm.

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09-17-2015, 02:08 PM

88gta3508

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Car: 00 SSEi / 94 C4

Engine: 231 / 383

Transmission: 4T65E / ZF 6sp

Axle/Gears: 2.93 / Dana 44 3:45

Re: Injector/fuel pump question

I would Eliminate the tiny FP coupler. Install 3/8 aluminum line flare and install a union coupler in it's place. Flare the other end. install a sockfilter. Upgrade to a external AEM fuel pump & lines, to -AN fittings.