Duramax Diesels Forum Truck of the Week
  #16  
Old 11-17-2017, 06:22 AM
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Quote:
Originally Posted by duramaxzak View Post
This is awesome, be nice to see how the L5P reacts to some of these mods.

I heard Mark from Danville is working on a drop in turbo for the L5P.
With all the hype of never being able to tune one....I wonder why he would be doing that
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  #17  
Old 11-17-2017, 06:50 AM
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Personally I don't understand modding an electronically controlled engine that can't be tuned.
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  #18  
Old 11-17-2017, 07:19 AM
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Quote:
Originally Posted by Yngdmax92 View Post
With all the hype of never being able to tune one....I wonder why he would be doing that
Yes, I do have one that we are hopefully going to be installing very shortly. The reason for it is if we can't tune them then we can atleast try to get them more efficient! We did the same thing for the LML and it made a big difference in the way it drove and towed. Time will tell!
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  #19  
Old 11-17-2017, 07:26 AM
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How much digging did you have to do to get at the turbo? Looks like it might be a PITA to get to...


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  #20  
Old 11-17-2017, 07:54 AM
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This video is pretty interesting and informative on the L5P.

https://youtu.be/MHmWOHqbyW4
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  #21  
Old 11-17-2017, 08:12 AM
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About time GM put a lift pump on the dmax.
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  #22  
Old 11-17-2017, 10:09 AM
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Quote:
Originally Posted by Hambone View Post
Lucky! Wish I lived closer to Mike



More Powa!!!
Or could be something as simple as easier cold start

OP have you noticed how fast the heater works...
Or all the weird solenoid type sounds when you shut it off or even opening the door?
Hell mine actuates what Iím assuming is the vanes on my turbo randomly with the truck off!
Canít really R&D with a company vehicle lol
Haven't really noticed the heater is hasn't really dropped before 60's for very long. It does make some strange noises that's for sure.
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  #23  
Old 11-17-2017, 10:11 AM
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Quote:
Originally Posted by OregonDMAX View Post
Personally I don't understand modding an electronically controlled engine that can't be tuned.
You can fool the map sensor so the truck makes more boost. How much you actually can before the truck doesn't like it I'm not sure. But if you had a turbo that flowed more air it wouldn't have to choke the veins and it could make quite a bit more power.
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  #24  
Old 11-17-2017, 10:36 AM
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14.86 completely stock, non boosted. Boosted was slower, the damn ECM takes over wether you like it or not. Leave on the 2nd yellow because throttle delay sucks ..,, .180’s-.200’s is a normal light.
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  #25  
Old 11-17-2017, 01:36 PM
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Quote:
Originally Posted by hondarider552 View Post
About time GM put a lift pump on the dmax.
They've always had one. GM had so many problems with electric lift pumps in the 6.2/6.5 that they went with a 1/2" feed line and a gear driven lift pump bolted to the back of the CP3. So they've always had one, it was just part of the CP3.
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  #26  
Old 11-17-2017, 01:51 PM
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Quote:
Originally Posted by THEFERMANATOR View Post
They've always had one. GM had so many problems with electric lift pumps in the 6.2/6.5 that they went with a 1/2" feed line and a gear driven lift pump bolted to the back of the CP3. So they've always had one, it was just part of the CP3.


Ummm. Don't think so. At least not according to the people (Bosch) who designed and manufactured the CP3 pump. They could be wrong though.


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  #27  
Old 11-17-2017, 02:29 PM
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Quote:
Originally Posted by IOWA LLY View Post
Ummm. Don't think so. At least not according to the people (Bosch) who designed and manufactured the CP3 pump. They could be wrong though.


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It works as a low pressure suction and a HP feed it just does a terrible job as a suction pump
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  #28  
Old 11-17-2017, 03:01 PM
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Lift pump has its name for a positive pressure supply. The design on a cp3 pump is quite impressive drawing fuel from the tank maintaining vacuum psi factory form. CP4.2 does also on factory pulse and lower mileage, but when turned up a little and supply is ran short, not so much obviously, hence why they added a lift pump to the L5P to eliminate similar problems on they new fuel system design that has not been proven.
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  #29  
Old 11-17-2017, 04:34 PM
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Quote:
Originally Posted by OregonDMAX View Post
It works as a low pressure suction and a HP feed it just does a terrible job as a suction pump


Exactly. Because it was never intended nor was it designed as one. Bosch specifically called out for a supply pump to pump the fuel from the tank to the CP3 pump inlet in the original design of the fuel system for the Duramax. GM is the one that omitted it.


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2003 GMC CCSB LLY
Built by me, tuned by me.

2009 ECI Diesel Truck Points Champion
2010 ECI Diesel Truck Points Champion
2011 ECI Diesel Truck Points Champion
2012 ECI Diesel Truck Points Champion

Big thanks to everyone who helps me.

Best 1/8th, 7.29, 98.6MPH (Street tires, fuel only, single Journal bearing GT42 charger) (2010)

Best 1/8th, 6.93, 104.24MPH (Street tires, fuel only, single HX60 turbo) (2016)

Best 1/8th, 6.60, 106.6MPH (Street tires, fuel only, single HX60 turbo) (2017)
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  #30  
Old 11-19-2017, 06:10 PM
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Alright trans should be running at max pressure now. Noticed slightly better throttle response a little less dead pedal. Not as big of a difference as an LML but worth doing. Installed the AFE scorcher right now and the first setting didn't really feel much just better throttle response. The middle setting was ok. The performance setting defiantly made a difference. Not really sure if it's the 70hp they claim but I feel at least 50hp according to my butt dyno. 4wd launches are fun, might run low 14's. We'll find out when it goes to the track. Still have to install the intake.
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