Duramax Diesels Forum Truck of the Week
  #1  
Old 11-16-2017, 03:59 PM
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Default Fastest L5P

My dad just picked up an 18 L5P and of course we can't leave anything alone. I was hoping to get it to the track to get a baseline but the rain isn't cooperating. Have something to throw into the trans, picked up a AFE intake, and AFE's plug in module(just fools boost and rail pressure) AFE claims almost 500hp to the tires with those two things. Going to order a lift pump and modify the factory fuel pick up. Oh and going to change the u joints in the front shaft for launches. The truck only has 500 miles so far so I'm going to wait till It hits 1000 before I start testing(I can't wait till 10,000 like I should ). Would like to add boost tubes and blankets for the turbo and manifolds but that'll likely won't happen for a few months.
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Old 11-16-2017, 04:00 PM
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You gonna stack lift pumps on lift pumps?


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Old 11-16-2017, 04:13 PM
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Quote:
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You gonna stack lift pumps on lift pumps?


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Trying to bring back the triple stack of doom
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Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

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Old 11-16-2017, 04:15 PM
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Quote:
Originally Posted by M.A.M. View Post
You gonna stack lift pumps on lift pumps?


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Wait does it have a factory lift pump?
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Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

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Old 11-16-2017, 04:15 PM
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Lol... I have no idea what the factory lift pump is rated at, but till you get a lot more air into it, probably wonít need more than it can give you...


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Old 11-16-2017, 04:22 PM
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Quote:
Originally Posted by M.A.M. View Post
Lol... I have no idea what the factory lift pump is rated at, but till you get a lot more air into it, probably wonít need more than it can give you...


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I figure I can modify the factory pick up because I'm sure it could use help. My LMM was sucking through a 5/8's straw
But whatever it takes to make this thing make power I'll do lol.
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2008 GMC duramax crew cab short bed 2500.
10.98@124mph

Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

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Old 11-16-2017, 06:26 PM
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http://www.trucktrend.com/how-to/eng...e-duramax-l5p/

Apparently it puts out 58psi!
Or as they put it 4bar
Haven’t actually tested myself that’s just what they claim
What’s available for the trans?
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2005 2500 CC/SB "LLY" LTZ
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awaiting stuff to go BooM then replace with more go fast parts!

And a few other retired Duramax's
06 360k aka Hog truck
07 320k aka Shop truck
07 340k Flatbed spare welding rig

Last edited by Hambone; 11-16-2017 at 06:32 PM.
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Old 11-16-2017, 07:22 PM
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Cts always 58 to 60 on lift pump pressure on mine..
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Old 11-16-2017, 08:40 PM
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Quote:
Originally Posted by Hambone View Post
http://www.trucktrend.com/how-to/eng...e-duramax-l5p/

Apparently it puts out 58psi!
Or as they put it 4bar
Havenít actually tested myself thatís just what they claim
Whatís available for the trans?
Mike L secret squirrel things

Quote:
Originally Posted by kiwilml View Post
Cts always 58 to 60 on lift pump pressure on mine..
Oh wow that's a lot. I might just check out the pick up and look for restrictions.
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2008 GMC duramax crew cab short bed 2500.
10.98@124mph

Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

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Old 11-16-2017, 10:03 PM
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Is it not maintaining rail pressure?
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Old 11-16-2017, 10:17 PM
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Quote:
Originally Posted by boostwhore View Post
Is it not maintaining rail pressure?
Holds pressure fine, they always seem to run better with less restriction at least the older trucks did.
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Thanks to Mike L, SoCal Diesel, and Abel Chevorlet.

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Old 11-17-2017, 05:00 AM
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So they made the diesel fuel system like the LS engines now? 55-60psi is what their fuel pumps output, too. Interesting. I wonder why?
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Old 11-17-2017, 05:23 AM
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Quote:
Originally Posted by TheBac View Post
So they made the diesel fuel system like the LS engines now? 55-60psi is what their fuel pumps output, too. Interesting. I wonder why?
Denso injector pump will not suck fuel at all it has to be pressurized unlike the cp3/4

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Old 11-17-2017, 06:03 AM
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Lucky! Wish I lived closer to Mike

Quote:
Originally Posted by TheBac View Post
So they made the diesel fuel system like the LS engines now? 55-60psi is what their fuel pumps output, too. Interesting. I wonder why?
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 I’m assuming is the vanes on my turbo randomly with the truck off!
Can’t really R&D with a company vehicle lol
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2017 2500 CC/LB "L5P" WT

2005 2500 CC/SB "LLY" LTZ
Typical mods for Longevity
awaiting stuff to go BooM then replace with more go fast parts!

And a few other retired Duramax's
06 360k aka Hog truck
07 320k aka Shop truck
07 340k Flatbed spare welding rig
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Old 11-17-2017, 06:15 AM
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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.
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2005 CHEVY 2500HD RCLB 2WD Duramax/Allison

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