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Old 03-08-2014, 10:03 AM   #1
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65 lbs Injector Limit

I know most everyone goes with ID850s for injectors, but how far can you go with 65lbs injectors?

I'll be running a Roto-Fab, Phadt LTs, and 10% lower for now, and my next steps will be a TB, tires and hx. After that possibly up to a 18% pulley, but nothing more than that.

As long as I stick with the above mods, is there any need to go over 65 lbs injectors?
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Old 03-08-2014, 10:08 AM   #2
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I would like to know also what the "limit" is with the stock injectors.
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Old 03-08-2014, 04:07 PM   #3
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According to this the 65 lb injectors are good for 800 crank hp and the stock 56 lb should be good to 700 crank hp. FWIW...

http://www.deatschwerks.com/resource...tor-calculator
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Old 03-09-2014, 01:16 PM   #4
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Originally Posted by Whos_Drivin View Post
According to this the 65 lb injectors are good for 800 crank hp and the stock 56 lb should be good to 700 crank hp. FWIW...

http://www.deatschwerks.com/resource...tor-calculator
Thank you fantastic link.
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Old 03-11-2014, 09:47 AM   #5
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Stock injectors vary from car to car(M6 vs A6). They usually max out in the 550 rwhp range(+/-) 10hp on a dynojet.
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Old 03-11-2014, 11:44 AM   #6
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Originally Posted by Stephen12ZL1 View Post
Stock injectors vary from car to car(M6 vs A6). They usually max out in the 550 rwhp range(+/-) 10hp on a dynojet.


I'm at 543 rwhp (auto trans) with Headers/Cats, Intake, Ported LSA TB and my stock injectors are at around 110% duty cycle. Getting ID850's put in tomorrow.
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Old 03-11-2014, 01:01 PM   #7
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Originally Posted by BaylorCamaro View Post


I'm at 543 rwhp (auto trans) with Headers/Cats, Intake, Ported LSA TB and my stock injectors are at around 110% duty cycle. Getting ID850's put in tomorrow.
Double

My injectors maxed out with a Roto-Fab CAI, big gulp, ported TB and 10% overdrive crank. Combo dyno'd at 550 rwhp. Manual trans. Stock injectors have been replaced by ID 850s.
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Old 03-11-2014, 01:43 PM   #8
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Originally Posted by hawk02 View Post
Double

My injectors maxed out with a Roto-Fab CAI, big gulp, ported TB and 10% overdrive crank. Combo dyno'd at 550 rwhp. Manual trans. Stock injectors have been replaced by ID 850s.
That's good to know. I was heading in that direction. When you updated the injectors did you leave the fuel pump stock? And why 850's ? Tune ability or in case you go with more hp?
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Old 03-11-2014, 04:39 PM   #9
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That's good to know. I was heading in that direction. When you updated the injectors did you leave the fuel pump stock? And why 850's ? Tune ability or in case you go with more hp?
Yes, fuel pump is still stock.

I had the 850s installed because I believe the injector data and batch matching that ID provides produces a more consistent level of performance compared to other brands of injectors. Downside is you pay a premium for that consistency.
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Old 03-11-2014, 05:51 PM   #10
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Hawk and Baylor....
What a/f ratio were you at when your duty cycle was that high on the stock injectors?
More importantly, had the COT fueling kicked in and how much additional fuel were you commanding?
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Old 03-11-2014, 08:48 PM   #11
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Yes, fuel pump is still stock.

I had the 850s installed because I believe the injector data and batch matching that ID provides produces a more consistent level of performance compared to other brands of injectors. Downside is you pay a premium for that consistency.
Thank you for your insight, I was hoping that stock injectors would be sufficient with 90 tb, headers and about 10% over on the lower. I guess as long as it's in the air one should get the id850 installed.
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Old 03-13-2014, 03:22 PM   #12
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Originally Posted by white 2SS/RS View Post
Hawk and Baylor....
What a/f ratio were you at when your duty cycle was that high on the stock injectors?
More importantly, had the COT fueling kicked in and how much additional fuel were you commanding?
Great Question, I would also like to know what the Injector Opening time was in Milliseconds.

I don't see how a stock pulley can make the injectors go to 110% duty cycle unless your commanding so crazy rich AFR or it is in COT mode.

Anything above a 10% crank pulley we recommend ID-850 injectors.

Ted.
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Old 03-14-2014, 07:49 AM   #13
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Quote:
Originally Posted by white 2SS/RS View Post
Hawk and Baylor....
What a/f ratio were you at when your duty cycle was that high on the stock injectors?
More importantly, had the COT fueling kicked in and how much additional fuel were you commanding?
Sorry, don't know the answers to these questions.

I was informed by the tuner that the injector duty cycle hit 100% at the rev limit. To keep the engine safe, he recommended installing higher flow injectors or reduce the rev limit to 5500 rpm.

Trust me, I was very surprised to learn the injectors had maxed out. Everything I read said the stock injectors were adequate up to a 10% crank pulley. Any bigger pulley and you needed to upgrade injectors. However, doing a little more research afterwards, I found info that suggested injectors needed to be upgraded when boost reaches 12 lbs or more. My car measured more the 12 lbs of boost at peak with pulley, CAI, Big Gulp and ported TB so the need for injectors didn't seem that unreasonable.
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