LB7: Rail PSI ?'s
- Thread starter JJK-
- Start date
Does it hurt anything? Nope...
I'd bet your fuel supply goes into vaccum under load...
My AD165 was idling at 3 PSI from the factory and now I have it set at 14 and am no longer getting codes for low rail pressure or change fuel filter at WOT
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I haven't been able to get with my tuner, but I checked my pulse width through my insight and I'm seeing 3100 at WOT. My injectors are pretty small, somewhere around 15-20% over, I think. I do have a bag of parts on my cp3, I think they claim 15% more flow. Does that PW seem high based on my injectors and the bag of parts?
Yeah. If you're calling for 3100uS with 20% overs and all you're packin is a bag-o-parts, that's your problem
A lot of trucks can't hold 3100 with stock injectors. In personally would lower the pulse some and see if it brings rp back up. Mathematically speaking, 20% injectors at 2600 pulse is the same as stock injectors at 3100 pulse to give you an idea on how much bigger they are
That all makes sense.. I think I'll give 2600 a try and see how that effects my RP.. Thanks for all the feedback...
I'm pretty green when it comes to this stuff, although I'm slowly learning.. If the pulse width is lowered, does the timing need to be adjusted as well? If so, Is this motor timing or injector timing?
Thanks! Went to the RKL Dyno event today.. Put down 588 on the dyno. Rail pressure dropped to 18.5k and the pulse width was still around 3100. Ryan, my tuner, didn't have time to log it and adjust it, he was busy all day. He's gonna look at it next week. He said he thought he set the pulse width around 2600-2700 but can't remember, he's done a lot of trucks.. It's possible my insight is reading pulse width and rail pressure on the low side, but not likely. That was a better number than I expected.. I also added a boost valve, huge difference in power obviously. Thanks for all the feedback to you boyz!.....
Yes.. Custom Auto's Dyno. I ran my #1,3,5 tune. 484, 526 and 588.. I thought that was way high also. I was expecting slightly over 500. There were a few other lb'7 around 515-530 and one that did 564. I'm not sure what my boost was, but I know it was a lot higher( I haven't got a boost gauge hooked up, just the insight). Custom Auto left their dyno until next Friday. Ryan's gonna see if we can use it next week after he tweaks my tuning. I'll see if I can get a video and post it.
you can make your own for cheaper....we make them for cat motors easy to make any brass 1/4 size valve will do. But beware if your motor is stock anything over 26 pounds of boost could cost you your block.
the PPE valve has a spring in it will give you a few more pounds of boost but that is it.
