Injectors

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Jul 29, 2004 | 07:37 PM

Watch22

Thread Starter

Racer

Joined: Jan 2004

Posts: 458

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From: Brunswick OH

Injectors

How many of you have change their injectors? I was in the process of getting my car dyno tuned and the injectors are close to the MAX. With the mods in my sig I'm currently hitting 375HP on the dyno, there is still a bit left in her hopefully 385. I can't finish tuning the car because the injectors are running at a 85%-95% duty cycle from 3900 - 6500RPMs, and causing the car to run very lean on the top end and ping like crazy. If I try to add fuel it takes the injectors to almost 100%.

I just ordered SVO 30# injectors and should be here on Friday. I don't see to many people talking about replacing injectors. I would not have noticed unless I scanned while on the dyno.

Jul 29, 2004 | 09:17 PM

Greg_E

Melting Slicks

Joined: Jun 2002

Posts: 2,246

Likes: 66

From: Middletown CT

Something doesn't sound right. Those injectors should be good to around 450RWHP, from what I've read. at 375 RWHP , you should have no reason to replace the one's you have. I have no problems running the 28.8 # injectors with 400 RWHP and others with more HP are using them, also with no problems.

Jul 30, 2004 | 12:23 AM

Bink

Safety Car

Joined: Mar 2002

Posts: 4,928

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Cruise-In V Veteran

St. Jude Donor '09

Are you on a Dynojet???? Mustang - Load dyno???

Jul 30, 2004 | 12:39 AM

MIKE-C5

Race Director

Joined: Jan 2003

Posts: 19,802

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From: San Antonio Texas

St. Jude Donor '05-'06-'08

Injectors

I ran my 28 Lb. Injectors with 495.3 RWHP with no problem........

Jul 30, 2004 | 01:22 AM

mdhmi

Team Owner

Joined: Jul 2003

Posts: 20,474

Likes: 2

From: Detroit

I put in 42's with a Racetronix fuel pump. No problems here.

Good luck,

Mark

Jul 30, 2004 | 08:50 AM

dmtnt

Safety Car

Joined: Nov 2003

Posts: 4,969

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From: Lake Worth FL

St. Jude Donor '03-'05-'06 & '12

I just put in SVO's. My only mods before were a Vararam, some LS1Edit'ing and a Shaner S2. At WOT, my injector duty cycles were 100%, and even 101% on one log.

Now with the SVO's, they're in the 80-85% range at WOT. IMO, the stock injectors are inadequate for an LS6, even with just bolt-ons.

Jul 30, 2004 | 09:24 AM

mallett435

Pro

Joined: Jul 2003

Posts: 565

Likes: 41

From: xyz VA

Quote:

Originally Posted by dmtnt

I just put in SVO's. My only mods before were a Vararam, some LS1Edit'ing and a Shaner S2. At WOT, my injector duty cycles were 100%, and even 101% on one log.

Now with the SVO's, they're in the 80-85% range at WOT. IMO, the stock injectors are inadequate for an LS6, even with just bolt-ons.

I agree 100%. I had 383rwhp and IDC was 100% with stock injectors. After upgrading the FAST intake and LG headers, my tuner said I better upgrade injectors or be sorry and it gives the tuner more room to work with fuel trims. Now, I have the SVO 30s with 413rwhp/420rwtq and my IDC is still in the 90s.

People say they ran 4xx rwhp with stock injectors, but that doesn't mean it ran optimally. Unless a scan is done, they don't know what they are losing or hurting by using stock injectors. No way is their IDC under 100% with stock injectors and ideally you want it in the 80s. Bottom line to me is that they are not expensive and why not be safe than sorry. You will be able to tuner more efficiently having the bigger injectors. You can tune bigger injectors if you have a little too much injector to work, you can't tune smaller injectors (than you need) to compensate for size.

Chris

Jul 30, 2004 | 09:46 AM

Watch22

Thread Starter

Racer

Joined: Jan 2004

Posts: 458

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From: Brunswick OH

The car was run on a dynojet with wideband. The SVO 30# will be here in a few hours from UPS.

I was at the dealer this morning getting the latest updates in the computer and the vette tech's who also have high HP vettes said the stocks are only reliable to about 370RWHP. Anything over the 80% duty cycle the injectors have a chance of no spraying correctly.