Do I need bigger injectors??

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Nov 17, 2009 | 06:33 PM

Techsan

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From: Arlington, Tx

Do I need bigger injectors??

I just bought this 01 ZO6 and the previous owner said he was thinking of adding larger injectors, he said he asked Vette Doctors and they said he was fine but he thought he was maxed out with these. So I was just seeing what you guys thought. This is what is done to it.

Block honed
new GM larger pistons/rings & rod bearings
PRC 5.3 stage 2.5 heads
PRC 228r cam
PRC hardened pushrods
PRC dual valve springs
LS2 timing chain
Centerforce Dual Friction clutch
CCA oil catch can
Tick performance remote clutch bleeder
Dynatech powercats
Vette Doctors dyno tuned 426rwhp/408rwtq (DD dyno)
Dynatech stainless LT headers & x-pipe w/hi-flow cats
Borla quad-tip Stingers
Vararam 2B CAI

Nov 17, 2009 | 06:37 PM

0HinsonSuperCars

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From: Birmingham, AL www.hinsonsupercars.com 205-909-9402

I would recommend upgrading the injectors. They're going to be 100+% duty cycle.

Seth

Nov 17, 2009 | 06:47 PM

Techsan

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What size will I need. I really dont plan on doing anything else to the car. And why do I need them? Just wondering. Thanks

Nov 18, 2009 | 02:40 PM

Techsan

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From: Arlington, Tx

ttt

Nov 18, 2009 | 09:39 PM

Techsan

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ttt

Nov 18, 2009 | 10:25 PM

BlueRag

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From: Z16 #1990 Ridgecrest CA

Quote:

Originally Posted by 98texasvette

I just bought this 01 ZO6 and the previous owner said he was thinking of adding larger injectors, he said he asked Vette Doctors and they said he was fine but he thought he was maxed out with these.

My opinion is to trust the Vette Doctors opinion. Different engines making the same RWHP can have different fuel requirments due to engine efficiency (BSFC). I designed and built my 04Z's head/cam combination and did most of the engine tuning. My injectors are stock (28.6 lb/hr), and the max injector duty cycle at WOT is about 92%.
On the RPM Motors dyno, Charlie finished up my tune and produced 442/405 RWHP/RWTQ SAE.......once again, stock 04 injectors. Get someone with HPTuners to scan your setup and log your injector duty cycle, and then you will know for sure

Nov 19, 2009 | 12:43 AM

OhioC5

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From: Akron Ohio

I had just about the same set up on my 97 coupe and ran 36 lb injectors. I still have all the fuel tables if you decide to upgrade. My factory injectors were maxed out as I imagine yours are too.

Nov 19, 2009 | 05:52 PM

0HinsonSuperCars

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From: Birmingham, AL www.hinsonsupercars.com 205-909-9402

Quote:

Originally Posted by 98texasvette

What size will I need. I really dont plan on doing anything else to the car. And why do I need them? Just wondering. Thanks

Most injectors will max out at 80% duty cycle and this is the accepted industry standard. After you install heads, cam, intake, your sucking in alot more air and your motor needs more fuel. Your injectors will be unpredictable when maxed out and you do not want to be running out of fuel at 6000+ rpm. I would recommend FAST 36's or SVO 42's.

Seth