[Z06] When do we upgrade injectors???
Thread Starter
Advanced
Joined: Aug 2007
Posts: 58
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From: Summerville SC
When do we upgrade injectors???
Friends,
I'm a couple weeks away from my h/c/fast install and im trying to make sure im totally prepared. How many of you guys are running stock injectors with an aggresive h/c setup?
I have an 01 Z....parts going in are afr 205's milled to 58cc, ported fast 90/90, G6x3 cam, lg pro longtubes, halltech cai, slp u/d pulley, modded ti catback.
Do you guys think the stock squirters will do the job?
thanks
I'm a couple weeks away from my h/c/fast install and im trying to make sure im totally prepared. How many of you guys are running stock injectors with an aggresive h/c setup?
I have an 01 Z....parts going in are afr 205's milled to 58cc, ported fast 90/90, G6x3 cam, lg pro longtubes, halltech cai, slp u/d pulley, modded ti catback.
Do you guys think the stock squirters will do the job?
thanks
Melting Slicks
Joined: Dec 2006
Posts: 2,186
Likes: 2
From: Woodinville WA
A lot of guys say its necessary. A couple of really good tuners told me the stock ones will go to 475 rwhp in N/A form with no problem. I argued this in the past with a guy who thought he needed them for his 430 rwhp car. He went ahead anyway and spent the money on injectors and a new dyno tune, and he didn't gain any power.
It sounds like your on target to be right at the edge of the stock injectors' capability, so I would step up now so you don't have to pay extra to retune later if your stockers aren't enough.
It sounds like your on target to be right at the edge of the stock injectors' capability, so I would step up now so you don't have to pay extra to retune later if your stockers aren't enough.
Last edited by ctusser; Sep 17, 2008 at 08:22 PM.
Safety Car
Joined: Sep 2002
Posts: 4,030
Likes: 6
From: Maryland
Much depends on your usage. When I had an LT1 C4 & ported the heads with a small cam, no headers, it was fine with the stock injectors. Until the day I took it on a road course and drove harder. Even shifting at 5000rpm to save the injectors, they blew (sharp drop in fuel economy post-event).
I would upgrade.
I would upgrade.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,477
From: South Florida
I have recorded my Injector Duty Cycle at 92% at peak RPM and I have bolt ons and a baby cam. Even I have thought about upgrading to larger injectors due to this. From what I hear you should not go about 90% but I have no idea why.
Burning Brakes
Joined: Jul 2005
Posts: 995
Likes: 2
From: Palm City FL
8th Gear
Joined: Sep 2008
Posts: 8
Likes: 0
injectors are not designed to run with that kind of high pulse width....its an on/off part. when you leave it on 92% of any given time it tends to get hot. the more on time you have (high pwm) the harder you are working the injector.
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
I was told the 475 thing by Jeff Creech at CAM... he did a poor tune on my car, but this isn't about that. After the Creech tune my car made 424/378 and had horrible drivability I took the car to Ed Hutchings for a proper street/drivability tune. The car left with 436/396 but he showed me that my stock injectors were at 106% duty cycle at WOT.
Sure it'd be fine for a street car or once in a while drag strip run, but I was running HPDEs at the time. I had even done one on my crappy tune with the understanding that I was "fine until 475 rwhp". I'm lucky nothing went wrong.
I ended up going with 42lbers for room to grow if I ever put heads on the car. It's not about making more power, it's about having the correctly sized injector for the job.
Go with 36s or 42s for you application.
Sure it'd be fine for a street car or once in a while drag strip run, but I was running HPDEs at the time. I had even done one on my crappy tune with the understanding that I was "fine until 475 rwhp". I'm lucky nothing went wrong.
I ended up going with 42lbers for room to grow if I ever put heads on the car. It's not about making more power, it's about having the correctly sized injector for the job.
Go with 36s or 42s for you application.
Thread Starter
Advanced
Joined: Aug 2007
Posts: 58
Likes: 0
From: Summerville SC
Good feedback....i'll prolly go with 36's....42 seems a little too much for a N/A motor.
So what brand injectors does everybody use?
So what brand injectors does everybody use?
Last edited by Z0777; Sep 18, 2008 at 12:30 PM.
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Pro
Joined: Jun 2007
Posts: 677
Likes: 0
From: Katy TX
Great topic. I have been asking myself the same question. I guess I will go with some new injectors as well. I already have cam but about to do a Heads/FAST install and I am trying to prepare everything as well.
Thread Starter
Advanced
Joined: Aug 2007
Posts: 58
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From: Summerville SC
Turns out you can get 42's for the same price as 36's.....on ebay.
check it...
http://cgi.ebay.com/ebaymotors/ws/eB...m=220281194610
http://cgi.ebay.com/ebaymotors/ws/eB...m=220281194750
Hmmm... might have to go with the 42's after all
check it...
http://cgi.ebay.com/ebaymotors/ws/eB...m=220281194610
http://cgi.ebay.com/ebaymotors/ws/eB...m=220281194750
Hmmm... might have to go with the 42's after all