Duramax Diesels Forum Truck of the Week
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Old 02-25-2015, 09:28 AM
IdahoRob IdahoRob is offline
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Default LML mods and dyno testing begins

Outside of my Mike L built trans (working flawlessly) and leveling kit and wheels/tires from DMax Store, I've had my LML stock for over a year now. I have used to build emissions friendly tuning for the stock trucks, which really wakes these up but getting bored.

I have a pile of parts sitting in the shop. Including, intake, lift pump, cp3 conversion, Danville 68mm stage 2r turbo.

This will be using all factory emissions in place.

Today is step one. Stock runs for base line, then tuning only, then S@B intake.

It'll be a week or so and then the lift pump will be added.

Another week or so an we'll do the turbo and CP3. We did a 2015 in house with everything and was amazed at the performance but I didn't have the time for step by step comparison as it was a customers truck.

I'll post up driving impressions and dyno graphs.

Thank you,
Rob
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Last edited by IdahoRob; 02-25-2015 at 10:39 AM.
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Old 02-25-2015, 09:32 AM
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subscribed. This is what I have been talking to Mark about too. Make more power and drivability with stock emissions.
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Old 02-25-2015, 09:40 AM
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Old 02-25-2015, 09:41 AM
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Old 02-25-2015, 09:48 AM
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Subd!
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Old 02-25-2015, 09:55 AM
Hernpj01 Hernpj01 is offline
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im in!
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Old 02-25-2015, 11:11 AM
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That's awesome Rob, we are doing same thing here in house with our 2011 LML. Be very interesting to see where we both end up with them. I'm pretty sure they will be cleaner than they are with the stock turbo. Time will tell!
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Old 02-25-2015, 03:46 PM
IdahoRob IdahoRob is offline
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Stock 2013 LML with full factory emissions intake and active. No lift pump or any mods outside of a MikeL Tranny, Running large heavy tires.

Stock tune made 325HP SAE corrected
Performance tune made 456HP SAE corrected
5th gear pulls with 20% load

Performance tune drops rail to about 24k from a commanded 29k until about 3200 RPM and then starts dropping fast. Running mild tuning 13.5 degrees at 3000 RPM. I have made more HP but wanted to test with sane timing.

S & B going on now and then will test both tunes again.
Attached Files
File Type: pdf lml test day 1.pdf (266.1 KB, 149 views)
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Please email me with questions at rob@atptrucks.com

2002 GMC 9.36 @ 154MPH SoCal engine, Randy's 48re, Big Twin Diesel
2013 LML, twins, MIKE L @ Inglewood Transmission
2018 L5P
www.atptrucks.com
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Old 02-26-2015, 07:47 AM
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Quote:
Originally Posted by IdahoRob View Post
Stock 2013 LML with full factory emissions intake and active. No lift pump or any mods outside of a MikeL Tranny, Running large heavy tires.

Stock tune made 325HP SAE corrected
Performance tune made 456HP SAE corrected
5th gear pulls with 20% load

Performance tune drops rail to about 24k from a commanded 29k until about 3200 RPM and then starts dropping fast. Running mild tuning 13.5 degrees at 3000 RPM. I have made more HP but wanted to test with sane timing.

S & B going on now and then will test both tunes again.
Stock tune seems about 20-25 hp lower than is should be. did the computer limit it during the dyno pull? This a post from MIkeL "--------------------------------------------------------------------------------

Dynoed my LML last Saturday at Westech on their Superflow.
355 hp and 655 tq. Totaly stock. "
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2011 LML maybe a little not stock
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Old 02-26-2015, 08:22 AM
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Mike L. Mike L. is offline
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Quote:
Originally Posted by fast03 View Post
Stock tune seems about 20-25 hp lower than is should be. did the computer limit it during the dyno pull? This a post from MIkeL "--------------------------------------------------------------------------------

Dynoed my LML last Saturday at Westech on their Superflow.
355 hp and 655 tq. Totaly stock. "
It must be the dyno as Rob's truck runs every bit as good as mine, maybe a little better. I run the same tune as his on my truck.
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  #11  
Old 02-26-2015, 09:13 AM
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Chevy1925 Chevy1925 is offline
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Quote:
Originally Posted by Mike L. View Post
It must be the dyno as Rob's truck runs every bit as good as mine, maybe a little better. I run the same tune as his on my truck.
built trans maybe robbing some power? unless yours had all the goodies when it went on the dyno back then
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  #12  
Old 02-26-2015, 09:16 AM
IdahoRob IdahoRob is offline
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Quote:
Originally Posted by fast03 View Post
Stock tune seems about 20-25 hp lower than is should be. did the computer limit it during the dyno pull? This a post from MIkeL "--------------------------------------------------------------------------------

Dynoed my LML last Saturday at Westech on their Superflow.
355 hp and 655 tq. Totaly stock. "
Agree, it is on the low side. The cool thing about having a dyno is testing winter fuel and heavy wheel/tire combo. This truck is running winter fuel which we see about 8% decrease in HP and a heavy wheel/tire combo which accounts for another 5% or so in my testing over time. These numbers vary according to HP and truck, etc.

The truck in the summer on stock wheels made 359hp, so the current winter fuel/tire combo is fairly accurate IMO. My dyno has proven over time to be a goldilocks, doesn't read too high, nor too low, but seems just about right.

Anyway, the dyno is just a tool to see changes. The air filter swap numbers blew my mind, stock and with performance tuning. I'll get around to that when time allows.
Attached Images
File Type: jpg Rob's lml.jpg (199.2 KB, 298 views)
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2013 LML, twins, MIKE L @ Inglewood Transmission
2018 L5P
www.atptrucks.com
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  #13  
Old 02-25-2015, 03:51 PM
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nice
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  #14  
Old 02-25-2015, 05:09 PM
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Care to share what pulse you stopped at? the reason I ask is because of where I have mine at and wanting to gauge what mine is putting down. where I am right now mine maintains 27K calling for th efactory 29k give or take a few 100 psi. also with no lift pump. I'm guessing due to your rail going lower then mine you might be over 1700uS ?
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Old 02-25-2015, 06:03 PM
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Rob, look forward to your progress.

BTW, nice to see you back. Have always appreciated your info.
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