When do you upgrade to larger injectors?
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Teching In
Joined: Sep 2003
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From: Laurel, MD
When do you upgrade to larger injectors? I have a '98 TA that has common bolt on ugrades including LS6 heads & intake and mild 226 cam + long tubes. Like title says are larger injectors (36#) a good choice at this time or would it be a waste of money & fuel with little to be gained. Thanks for any suggestions
I have a '98 TA that has common bolt on ugrades including LS6 heads & intake and mild 226 cam + long tubes. Like title says are larger injectors (36#) a good choice at this time or would it be a waste of money & fuel with little to be gained. Thanks for any suggestions
Last edited by Greekey; Feb 17, 2011 at 10:29 PM.
TECH Senior Member
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from what I read and hear on this forum 420 rwhp is the edge for stock 28# injectors.consider bigger if there is a head swap or radical cam in the near future.a tuner can adjust for a bigger injector .getting the AFR is all thats matter.is you fuel pump enough?
Thread Starter
Teching In
Joined: Sep 2003
Posts: 19
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From: Laurel, MD
Thanks for your thoughts all. I kind of figured it came down to duty cycle. I probably should clarify that since my car is down for clutch replacement (getting to be a regular occurance) I have finally decided to go ahead and install the head & cam pkg I've been sitting on for quite a while and was thinking if it would be worth it to go ahead and put in a fresh set of injectors of the next size while I'm at it. (28# to 36#) should cover this & future upgrades (maybe a LS3 short block)
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Your stock injectors are probably being pushed over the edge by now, especially with heads and cam. Injectors are ran on a duty cycle by a percentage. Depending on the mods to the car when, an engine is in need of more fuel, the injectors will be pushed to a bigger percentage duty. Meaning they will start to pump more fuel. A stock injector will only be able to reach a certain limit before it goes bad, or an unsafe duty cycle of 80% and above. Did you have the car tuned after the modifications? Depending on where your stock injector duty is at now will determine whether or not an injector upgrade is necessary.
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I have a '98 TA that has common bolt on ugrades including LS6 heads & intake and mild 226 cam + long tubes. Like title says are larger injectors (36#) a good choice at this time or would it be a waste of money & fuel with little to be gained. Thanks for any suggestions
meh its really hard to put a number on it because of the different ways that people make power and how the tune is. Like boost, nitrous, n/a, the difference in power through a m6 vs an unlocked auto ect... I think injector cycle the the biggest thing to watch. But yes stock injectors can be pushed a good amount.
Your right, but it been done time and time again there are people with the weak 00 26 lb injectors making 440 rwhp safely and the 28's are good for another 20-30 rwhp.... But yes watch the duty cycle and afr while tuning and make your decision that way.... Don't waste money on injectors unless needed you can spend the money elsewhere.
