Which CP3 for the LML

NC-smokinlmm

NC-smokinlmm

<<<Future tuna killer
May 29, 2011
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At Da Beach
Ok guys I'm seriously considering performing a cp3 swap. I'm on the fense about running a stock pump or something like a sportsman 750. I remember back when floor it was doing stroker pumps but they didn't last for shit. Are the new designed cast pumps from say fleece more reliable or should I just get a new Bosch and roll with it? I want low 600's out of her so I'm not looking for huge power, I was just thinking with the higher flowing piezo injectors more fuel may be necessary or at least beneficial...
 
Janimal444

Janimal444

Member
Jun 25, 2012
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Salem, NH
I don't have an answer for you, but I'm curious if you are doing this for power or reliability. The cp4s scare the crap out of me, personally.
 
TeaBagger2006

TeaBagger2006

Im a Garrett Nut Swinger
May 11, 2008
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Bis ND
If I was you I'd do a new stock LBZ pump. Exergy has the best pumps out right now, so I've heard, but for reliability and hp range you're shooting for I'd say new LBZ pump.
 
gmduramax

gmduramax

Shits broke
Jun 12, 2008
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Nor cal
Who sells a stock pump, but it's been modified to not restrict fuel over 3200rpm? That's the one id get.
 
plowboy_lbz

plowboy_lbz

Farmer
Aug 6, 2013
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Floor-it made of the best pumps out there. I believe he taught exergy how to do it. I heard he is still making them but in a different shop.
 
andy-stevenson

andy-stevenson

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Jul 7, 2013
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I was told by the Exergy salesman that either the 10mm or 12mm modded pumps would be as reliable as a stock pump.
 
quadracer37

quadracer37

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Mar 31, 2009
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northern, IL
We have several customers with 10mm pumps that have logged some good amounts of street mileage, so i wouldn't be worried one bit to run a 10mm single on a street truck.
Remember the 10mm pump is only going to have to run at maybe 75% load to achieve 600hp, while the stock LBZ pump is going to run 95-100% load to achieve your 600hp goal... Something to take into consideration.
 
Bonestock

Bonestock

Active member
Aug 9, 2010
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Worland Wy
I happen to have an Exergy 10mm cp3 for sale. It has 310 miles on it and would come with gear. I paid $2300.00 would like $1850.
 
HeavyDuty204

HeavyDuty204

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May 26, 2014
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I went with a stroker from Fleece.

Are the strokers known to whine? At low rpm when throttling to about 30% I get a high pitched whine which I'm attributing to the newly installed CP3 as I never heard the noise before.
 
coker6303

coker6303

Keep Calm and Chive On!!
Aug 6, 2009
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why would anyone be scared of the cp4? seems like bosch updated the pumps quickly and there are very few failures on newer trucks
 
coker6303

coker6303

Keep Calm and Chive On!!
Aug 6, 2009
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dmax711 said:
I think it's more of the fact that they can't support what a cp3 will h.p wise. That along with the failures that have happened.
Click to expand...

stock for stock, I thought the hp was very comparable on max effort? maybe not, i haven't really kept up with it as I'm not modding my LML.
 
HeavyDuty204

HeavyDuty204

New member
May 26, 2014
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Manitoba, CA
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.
 
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