Which CP3 for the LML

[coker6303]

No the CP4 can only support 550 rwh and reliability is an issue with them. It's not like they're blowing left and right, just when you're out of warranty people are opting for the better and cheaper solution of replacing with a more robust cp3 in the event the cp4 ever went.

As far as I know 500ish is all the cp4 can produce h.p wise.

assuming stock turbo, if so that's all over a max effort tune on a stock cp3/turbo truck. no reason to swap to a stock cp3 for power if you can build that power on a cp4.

I would like to see failures 2014+ which is when the bosch updates took place in the pumps from what I gathered. With my luck, i'll probably be one to lose a cp4 on my 2015!! lol

 

[elliottw]

Let me check the repair order on the one I did, believe it was a 14 but might have been a 13

 

[DIESELMAFIAPER.LB7]

The cp4 won't live at 500+hp a cp3 will

 

[NC-smokinlmm]

Im wanting to swap for both reasons. Reliability and power production, I know the cp4 was redesigned to try and stop the issue with the metering valve but it still worries me. Thanks for all the responses, I'm leaning towards the 10mm stroker pump. If you still have it when im ready I will be pm you Bonestock.

Also I've been told the redesigned pump flows a little more fuel, so it looks as though the newer cp4 can support about 525 to 550 rwhp which is a far cry from what a stock cp3 can do...

 

[coker6303]

how is 525-550hp a far cry from what a stock cp3 can do?? I'm cool with the reliability concerns and such, but I don't understand the "cp3 makes more power" answers here.

stock for stock, a max effort tune in either a cp3 or cp4 truck is going to net around 500-535. Some do a little more (wednesday trucks! lol) but that's pretty much the limit. Unless you are comparing a modded cp3 to a cp4 in terms of hp?

I'm not justifying anything, I'm not modding my LML. I'm just trying to wrap my head around the hp argument on a stock tuned truck.

 

[DMAXchris]

how is 525-550hp a far cry from what a stock cp3 can do?? I'm cool with the reliability concerns and such, but I don't understand the "cp3 makes more power" answers here.

stock for stock, a max effort tune in either a cp3 or cp4 truck is going to net around 500-535. Some do a little more (wednesday trucks! lol) but that's pretty much the limit. Unless you are comparing a modded cp3 to a cp4 in terms of hp?

I'm not justifying anything, I'm not modding my LML. I'm just trying to wrap my head around the hp argument on a stock tuned truck.

My stock cp3 is supporting 700rwhp and 40% injectors and still holding 24k of pressure. I think you're missing the point Russ. From what I understand, The cp4 can't go above 550ish, no matter what.

 

[duratothemax]

Its because the piezo injectors return much less fuel than the older electromechanical solenoid injectors...so much less fuel is "wasted" and bypassed. In other words, the same amount of injection pump on a piezo-injector engine will produce more HP than a solenoid-injector engine.

I think just swapping an LML to a stock CP3 is the equivalent of putting a "10% over" CP3 on a 2001-2010 solenoid-injector dmax.

 

[coker6303]

Its because the piezo injectors return much less fuel than the older electromechanical solenoid injectors...so much less fuel is "wasted" and bypassed. In other words, the same amount of injection pump on a piezo-injector engine will produce more HP than a solenoid-injector engine.

I think just swapping an LML to a stock CP3 is the equivalent of putting a "10% over" CP3 on a 2001-2010 solenoid-injector dmax.

Thank you for clarifying that Ben. Makes much more sense than just saying "more HP". :thumb:

 

[NC-smokinlmm]

Its because the piezo injectors return much less fuel than the older electromechanical solenoid injectors...so much less fuel is "wasted" and bypassed. In other words, the same amount of injection pump on a piezo-injector engine will produce more HP than a solenoid-injector engine.

I think just swapping an LML to a stock CP3 is the equivalent of putting a "10% over" CP3 on a 2001-2010 solenoid-injector dmax.

Well Ben if thats really case, the modded pump would not be needed to reach my power goal. Which is gonna save me some major coin for the turbo sawp and trans build. Thanks for your input guys. I really do appreciate it...:hug:

 

[duratothemax]

Talk to Fleece first, but thats the way I understood it...

 

[coker6303]

My stock cp3 is supporting 700rwhp and 40% injectors and still holding 24k of pressure. I think you're missing the point Russ. From what I understand, The cp4 can't go above 550ish, no matter what.

You may be right, I'm probably missing something. I'll just drive my stock LML and shut my hole lol ready for the reg cab to be up and running

 

[DMAXchris]

You may be right, I'm probably missing something. I'll just drive my stock LML and shut my hole lol ready for the reg cab to be up and running

:rofl:

The way I interpreted it was the CP4 cant move the volume of fuel that the CP3 can, but the CP4 works at a higher pressure, making it more efficient.
I give you credit for resisting the itch and keeping it stock, which is probably the hardest thing for a gearhead to do. lol

 

[Janimal444]

assuming stock turbo, if so that's all over a max effort tune on a stock cp3/turbo truck. no reason to swap to a stock cp3 for power if you can build that power on a cp4.

I would like to see failures 2014+ which is when the bosch updates took place in the pumps from what I gathered. With my luck, i'll probably be one to lose a cp4 on my 2015!! lol

I did not know Bosch had made changes. I'd be interested to see this as well.

 

[x MadMAX DIESEL]

:rofl:

The way I interpreted it was the CP4 cant move the volume of fuel that the CP3 can, but the CP4 works at a higher pressure, making it more efficient.
I give you credit for resisting the itch and keeping it stock, which is probably the hardest thing for a gearhead to do. lol

How much pressure?

 

[GMC_2002_Dmax]

A stock LML PW is around 1100 at 29K psi.

I have a Exergy 100MM3 LML that held over 2500 for PW with twins and held right at 30K psi.

All you need is a 10MM pump, I don't even thing dual Cp3's will be needed for 95% of LML owners.

I already have a built trans in my LML so the next step for me is a Cp3 conversion and I will go with either a Fleece 750 or a Exergy 10MM.

Both should do the job, I have not logged a Fleece 750 but I am sure it will keep up.

 

[Dirtbag]

I did the conversion on my LML. Went with the Fleece Cp3K pump and have about 1500 miles on it. So far its been great. Lots more power vs the CP4.

 

[NC-smokinlmm]

I did the conversion on my LML. Went with the Fleece Cp3K pump and have about 1500 miles on it. So far its been great. Lots more power vs the CP4.

Who tuned it? And how much more did they tell you they could get out of it with just a CP3 conversion?

 

[TheBac]

Who tuned it? And how much more did they tell you they could get out of it with just a CP3 conversion?

"EFI Tunes by Kory Willis" -- right in his sig.

 

[Dirtbag]

Yep.. Kory tuned it.. I think he's tuned close to 100 cp3 converted LML's.

 

[DIESELMAFIAPER.LB7]

Far as I know fleece and Kory are the only ones currently tuning cp3 conversions maybe Tony is going to be soon as well