I have a 94 camaro z28, M6. The car is cutting out at 4600rpm and above at 100% throttle. It is also peaking out at 90% Injector duty cycle. That is what my data master logs is showing. Does this mean I have gone over the horse power limit of the stock injectors.

 

What was wrong with the answers you got in this thread?

https://www.camaroz28.com/forums/sho...d.php?t=603489

 

What was wrong is nobody answered the question I asked. If you recall you inquired about more information which you never responded to. If I could get a definate answer on. The car starts to cut out at 4600rpm and above at 100% throttle. The injector DC is peaking out at around 90%. I don't think its ignition related the plugs, and wires are new and the distributor has only about 2-3 thousand miles on it. The car runs great until 100% throttle at 4600rpm and above.

 

90 is over normal limits they say to keep them in the 80 to 85% range depending on the type. I wouldn't think that would be your be problem. but some 30# wouldn't hurt. can be found used cheap.

 

Your close to the point of replacing them but i would guess its not just the injectors causing your issues. Your mods are not that radical.

 

In my experience you have to make about 350rwhp before your stockers are going to run out of flow. I kinda doubt that you're making 350rwhp+ at 4600rpm's. Go to autozone and get a fuel pressure gauge tape it to the windshield and if the pressure drops at 4600 while wot start looking at the regulator and filter, if that doesnt cure the pressure drop its time for a new pump. Or and this would be rare, you could have a kinked or leaking fuel supply line, seen that before too. If fuel pressure is solid as a rock it is in fact time for some new injectors, I like f.a.s.t. or the ford svo stuff. Checking fuel pressure is going to be really the only way to know for sure.

Since you seem to have a scanner, what does your maf show in g/s when it starts cutting out just to give us an idea of how much of a deep breather the car is.

 

It's peeking out at 281.54 AFGS while its cutting out. The car is at 5150 rpm, 118mph.

 

Just to answer your specific question, it is NOT your injectors that is the problem. Look elsewhere. You don't have the setup to max out your injectors that much.

Maxed out injectors will slowly lean out as you increase in RPM but we are talking from 4500 to 5000 you might have an issue with AFR going from 12.8 to 13.5 or something irrelevant as that.