Performance Fuel injectors.... Will they really increase hp?

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Jul 2, 2005 | 01:30 PM

HotLaperC5

Thread Starter

Instructor

Joined: Sep 2003

Posts: 185

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From: gaithersburg MD

Performance Fuel injectors.... Will they really increase hp?

I've read that upgrading fuel injectors from factory to performance will pay dividends in hp. Anyone know (from experience) whether its worth it or not? How much hp gain can you expect and at what cost to have installed? BTW, I've got a H/C package installed, performance headers, intake, Random Tech cats..... etc. etc. I'm just looking to eek out another 15-20 hp somehow.

Thanks in advance for your inputs!!

Happy 4th everyone!

Jul 2, 2005 | 01:32 PM

Honez

Pro

Joined: Dec 2004

Posts: 563

Likes: 1

From: Mission Viejo CA

You have to have the need for the bigger injectors. Until you get the car up over 470 HP your fine with your stock ones.

Jul 2, 2005 | 02:24 PM

IFLUBYU

Drifting

Joined: May 2003

Posts: 1,715

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From: cAshburn VA

If/when you have the need for them, like when your stock ones are over 95% duty cycle at WOT, the generally accepted formula is 1hp per 1/2# of injector.

Don't go by HP numbers alone.

Jul 3, 2005 | 01:01 AM

mdhmi

Team Owner

Joined: Jul 2003

Posts: 20,474

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From: Detroit

Upgrading injectors will not increase hp unless you are running out of injector. I ran out with the 42's and ended up going with the 60 #'ers.

Mark

Jul 4, 2005 | 12:47 AM

KorbenDallas

Melting Slicks

Joined: Aug 2000

Posts: 2,900

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From: Green Cove Springs FL

Quote:

Originally Posted by HotLaperC5

Injectors won't get you there. Ask your tuner if you need bigger injectors, but I doubt you have a problem or they would have told you when you got it tuned. If you tuned it yourself or had it done, then your injector duty cycle shouldn't go over 80%. If it does then upgrade, but you won't pick up any HP unless your motor was starving for fuel.

You didn't specify what type of intake you have. Normally H/C guys work on upgrading their intake to an LSX with an LS2 throttle body and a bigger MAF to squeak out those extra ponies. In the past people believed that doing these intake upgrades are worthless on a stock cube motor, but dyno's and track times has proved that theory wrong. When I'm itching to get an extra 15-20rwhp like you, I'm going to do these upgrades to my car. Good luck!

Last edited by KorbenDallas; Jul 4, 2005 at 12:51 AM.

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