Once it leaves the pump it won't push back through if that's what you mean?
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Dropping rail with 3 CP3s?
- Thread starter DPC
- Start date
Once it leaves the pump it won't push back through if that's what you mean?
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I mean, you have two pumps working (pulsing) fuel at presumably the
Same rate, then you have another pump pulsing fuel at a different rate (a pump mind you that needs to be timed in its original application) whose check valves, for lack of the correct nomenclature offhand, may not be able to overcome the pressure pulses of the other two pumps since it is timed and designed differently. I don't have any first hand knowledge of how well dual cp3 kits have been working on LMLs these days with the stock pump in the valley, but I have heard they didn't fair too well. Maybe a good question for Brayden or the bosch experts.
I had a simualar prob last fall and never did pin point the issue before loosing the mains,My setup was nowhere near as big as yours is but i also use a fingers triple cp3 controller but 3 lbz pumps.does this look familiar? https://www.youtube.com/watch?v=nuJ71SJHjew&feature=youtube_gdata_player had 1 pump explode and i think another on the way out causing the sputter but?Interested as to what is causing yours.
Last edited:
Yes same issue.
Yes, that is exactly what mine is doing! Initially I noticed it around 3k right where my pilot injection shuts off. I extended my pilot out to 4K and that helped at light throttle but did nothing at WOT.
Yes, that is exactly what mine is doing! Initially I noticed it around 3k right where my pilot injection shuts off. I extended my pilot out to 4K and that helped at light throttle but did nothing at WOT.
Dialing it in for the first time. The truck has gone through so many changes its hard to pinpoint the problem. I thought about saying the heck with it and putting twin 12mm Exergy pumps on it but that is a 5k bill I really don't want to mess with right now.
Yes, that is where I am going to start... I also have two spare PPE controllers I thought about hooking together to test.
That's horrible! What do you plan to change? I am curious as to how Yellow Jacket has his pumps setup.
The CP4 I was referring to is NOT a CP4 pump it is a CP3 from a 2010 6.7l Cummins, for some reason I thought the newer 6.7s had CP4s. I need to edit my first post... sorry for the confusion.
We were going to run 3 sportsmans but im glad wehrli talked me out of it. He said tuning can be an issue as well as controllers. And he has had lots of experience with trucks of matt's caliber(yellow jacket) built from the ground up in his shop. Good luck
GMC_2002_Dmax
The Still Master
Change your scaling to this
1800.000000
1648.500000
1488.750000
1326.750000
1215.750000
1159.000000
1121.500000
1088.000000
1056.000000
1020.000000
1000.000000
993.000000
986.000000
930.000000
878.000000
826.000000
770.000000
000.000000
000.000000
Then go to table B1009 and set to "0" as well.
That will force the regulators to go wide open, essentially no real control over the CP3's/CP4's so you should get the max rail psi out of it.
They also have a set of billet rails now, supposedly flow way more fuel and uses LLY #2 and #6 Injector lines and have a larger cross flow rail between both banks IIRC.
Good Luck
1800.000000
1648.500000
1488.750000
1326.750000
1215.750000
1159.000000
1121.500000
1088.000000
1056.000000
1020.000000
1000.000000
993.000000
986.000000
930.000000
878.000000
826.000000
770.000000
000.000000
000.000000
Then go to table B1009 and set to "0" as well.
That will force the regulators to go wide open, essentially no real control over the CP3's/CP4's so you should get the max rail psi out of it.
They also have a set of billet rails now, supposedly flow way more fuel and uses LLY #2 and #6 Injector lines and have a larger cross flow rail between both banks IIRC.
Good Luck
This will show if it is a supply or flow issue....
But in my experience with 3 pumps, (2 are 9.8mm lb7/LLY stroker pumps)(1 is a 6.7 pump) it will blow a check ball out of the injector from over pressure. 3 stock pumps he may be OK though.
You'll also force close off injectors, depending on if you have a way to log the actual actual pressure versus the desired. Check balls suck and they need to be welded closed
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