When you say the injectors "shut off", do you mean you saw a spike in rail pressure from the fuel having nowhere to go, or were you seeing a sudden drop in rail pressure after 28,000 psi?
Rail pressure sensor
- Thread starter catman3126
- Start date
No drop in rail at all, just engine shuts down. Which, with the stock sensor years prior, we had no idea what it even was at.
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oh, the way I read your previous statement was that it was the injectors' not being able to take 28k+ psi for some reason....yea, scaling the sensor out and building in a buffer in the tune will prevent what you had too.
I ran 240 mpa for 2 years sled pulling with an LLY and never experienced what your describing. Yes I had a sensor that would read that high. I wonder what the deal is?
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What did you see for gains say over 180MPa? and did it actual hit and maintain that high? what did you run for CP3 pumps? and what size injectors?
As I increased rail pressure everything seemed to gain. Of course this was on the track not the dyno so I can't completely accurately answer your question. But up to 240 mpa I gained rpm at mid track, gained drive and boost pressure, and continued to put bigger and bigger gaps between me and 2nd place.
Back then I was just running 2 Stock CP3 pumps with old school arson kits. I can't answer the injector question because I was running something "custom" from TTS. I was told they were around 300% over Stock. But I wouldn't swear to anything.
Desired was 240 mpa when I quit increasing it, actual rail would vary from 230-240 down the track. I was running the pulse as high as I could to maintain 230+.
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I would have to believe that we were running higher than 28xxx when using stock -bodied 200% injectors. Just didn't have a big enough sensor at the time
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I mean we're happy with the injectors. Make great power and everything. Just burnt 5-6 pulls last year figuring that issue out.
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It would run fine in the upper 28xxx's iirc, which is 195-197mpa. So not like it's low or anything. I'd be interested to know the cutoffpoint catman. Assuming you can just make more & more. What ECM? LLY?
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So just to make sure I understand you correctly, you have logs of the ECM still fully fueling when it shuts down? You saying the something in the injector physically quits flowing fuel when the pressure goes to high right?
Your asking about what ECM catman is running just made me second guess myself.
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That's why I asked about if you saw actual rail pressure drop or spike....if you didn't then I will go out on a limb and say it had nothing to do with the injector.