LML Performance Potential [Archive] - Duramax Diesels Forum

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ChargedTTq
01-15-2015, 07:06 AM
Hi guys, I'm in the market for an LMM or LML Duramax. I plan for 750-800hp as a short term goal, potenitally 1000 some day. I know the LMM has the potential but adding the LML to my truck search it increases the number of trucks I have to choose from. Is it feasible to make this kind of power with the LML? I'm ok if it costs ~10% more than an LMM or so. But if everything costs a ton more I'll limit myself to the LMM. Also, for anyone who knows, how much more does the 2011+ chassis weigh than the 07-10 chassis? Is it still lighter than the Fords and Dodges?

andy-stevenson
01-15-2015, 08:17 AM
I wouldn't plan on pushing 750 - 800hp through either with a stock motor.

ChargedTTq
01-15-2015, 08:32 AM
Oh no doubt I understand I'll need slugs and rods. But last I heard the lml fuel system and tuning was a weak point.

I know yoi can dual fuel lmls but I don't know anything about the lml injectors.

02CCSB
01-15-2015, 08:41 AM
No offense, but if you're asking this question, I have a hard time believing you're aware of what an 800+HP truck truly costs...

600 reliable hp - $14000 (built trans, CP3 conversion, FASS, big tune, exhaust, deletes, bolt ons)

Over 750 reliable hp - $45000+ (built motor, rods, pistons, keyed crank, cam, injectors, dual CP3s, billet built trans, above parts, compounds, etc etc etc)

e46_330i
01-15-2015, 08:47 AM
No offense, but if you're asking this question, I have a hard time believing you're aware of what an 800+HP truck truly costs...

600 reliable hp - $14000 (built trans, CP3 conversion, FASS, big tune, exhaust, deletes, bolt ons)

Over 750 reliable hp - $45000+ (built motor, rods, pistons, keyed crank, cam, injectors, dual CP3s, billet built trans, above parts, compounds, etc etc etc)


+1. 650hp is a whole different ball game than 750.


Sent from my iPhone using Tapatalk

Duramax One
01-15-2015, 09:05 AM
I wouldn't plan on pushing 750 - 800hp through either with a stock motor.

Didn't HKS get almost 3 1000 HP runs out of a stock LML? :joker::woott:

600 reliable hp - $14000 (built trans, CP3 conversion, FASS, big tune, exhaust, deletes, bolt ons)

In all seriousness, I have over $10,000 in go fast mods in my LB7 and I'm only pushing ~520 because I'm running out of fuel on my stock high mile CP3. Throw an extra $2k on there for either a dual or larger CP3 and you're looking at $12k for 600 HP. I did all the labor myself and am running a set of used injectors.

ChargedTTq
01-15-2015, 09:31 AM
Where are you getting your prices from!??

I planned on $10-15k for pre "built motor" power. (I figured 650, maybe 700-750 if lmls have better pistons and I want to push it)

And probably $10-15k for parts to build my own motor.

I have enough skill to build everything myself short of the trans (gonna have a reputable guy mod that)

IdahoRob
01-15-2015, 09:38 AM
LML is close to 1000lbs over earlier models. HP potential should be close with built engine but I've not seen any real high HP LMLs.

I have a LML on the dyno now with dual fuelers and a decent size set of twins and its in the mid 600's. The CP4 seems to hurt these trucks but there are options to get rid of them.

ChargedTTq
01-15-2015, 09:39 AM
Either way, this won't be short term as in one year, if I ever hit 1,000 it would take 5+ years.

ChargedTTq
01-15-2015, 09:42 AM
LML is close to 1000lbs over earlier models. HP potential should be close with built engine but I've not seen any real high HP LMLs.

I have a LML on the dyno now with dual fuelers and a decent size set of twins and its in the mid 600's. The CP4 seems to hurt these trucks but there are options to get rid of them.

Thank you Rob!

Do you have stock injectors on that puppy?

PACougar
01-15-2015, 10:11 AM
You're really need to do some searching/learning. It's true if you build it yourself, you can build a capable engine for between 10k-15k. The problem is that's just an engine. That's doesn't count a fuel system, turbo/kit, built transmission/converter, and heaps of odds and ends. I'm not telling you any of this to be discouraging, just trying to keep you in reality. Ask around, if you take what you originally thought it'd cost triple it and you'll be in the ballpark.

mike diesel
01-15-2015, 10:19 AM
I will be just shy of $20,000 for my engine, trans, fuel and air combo..I have gotten alot of good deals and also built my trans myself. Kind of sickening to think about actually.

ChargedTTq
01-15-2015, 11:30 AM
Well considering people spend $20k+ on sports cars and other toys I wouldn't feel bad about spending that to have a low 12 second duramax!

mike diesel
01-15-2015, 11:32 AM
I ran 12.0 on a stock motor. This 20k im speaking of will put me to a 10.9 if i want.

ChargedTTq
01-15-2015, 11:41 AM
I ran 12.0 on a stock motor. This 20k im speaking of will put me to a 10.9 if i want.

That's what I like to hear!

Really though, I'm not afraid to spend, I'll be keeping this truck potentially forever so its a lot of time to spread the money over.

Bustedknuckles
01-15-2015, 11:57 AM
Im happy at right around 550 or 600 and dont have too much money in mine. $500 tuning, $2,900 trans, $1,400 turbo kit, $600 fuel system, $50 tie rods sleeves, $300 extrude honed my stock injector nozzles, $300 gauges, ~$1,000 head studs n gaskets.

$chultz38
01-15-2015, 12:28 PM
Could you swap a '15+ Ford cp4 pump into a LML for a little more volume or is it still better to convert to cp3?

chevyburnout1
01-15-2015, 01:03 PM
I think combined I'm over $28,000 and I built my engine and transmission myself :roflmao::barf: It's the small things that will really add up on ya.

PACougar
01-15-2015, 01:05 PM
I think combined I'm over $28,000 and I built my engine and transmission myself :roflmao::barf: It's the small things that will really add up on ya.

You're not kidding. I think a lot of people forget all of the little stuff along the way. It's easy to just add up the big items and think that's it.

Vsouth
01-15-2015, 02:05 PM
I gave up trying to keep track of the dollar figure I have into my trucks. A good rule of thumb if you plan on building a motor and going big is this:

Be sure you can afford to pay for it twice!

Anything over 750rwhp will continually need your money if you plan on playing with that power very often. :o

MarkBroviak
01-15-2015, 03:24 PM
I gave up trying to keep track of the dollar figure I have into my trucks. A good rule of thumb if you plan on building a motor and going big is this:

Be sure you can afford to pay for it twice!

Anything over 750rwhp will continually need your money if you plan on playing with that power very often. :o

That would be the truth right buddy!!!

bigmackmiller
01-15-2015, 03:52 PM
That would be the truth right buddy!!!

Not to hi-jack but Mark are you guys tuning LML's yet?

MarkBroviak
01-15-2015, 04:57 PM
Not to hi-jack but Mark are you guys tuning LML's yet?

No sir, but as many damn calls a week I get about it I should, lol!

S Phinney
01-15-2015, 07:54 PM
I have lost count on mine as well. The biggest issues that I have had were not things within my control and for the biggest part have not be catastrophic. Then I seem to spend a little more each time to improve on something. That adds up quickly.

bigmackmiller
01-15-2015, 09:03 PM
No sir, but as many damn calls a week I get about it I should, lol!

The people have spoken! lol

IdahoRob
01-17-2015, 06:57 PM
We just finished a little build here. Dealer dropped off a shiny new 2015 Denali with less than 100 miles on it. We installed a MikeL built tranny, cp3 conversion (not duals), Danville 3794 stage 2 and a lift pump. I loaded a basic tune that I've been using on my DD and WOW.

I took it for a spin and from a dead stop, it'll pull about 20' and then roast the tires through every gear until I got scared. Thing is a beast. I will dial in the tuning and have some dyno numbers, I'm really impressed. The truck is for a customer that lives out of the country and it's not broken in, so I'm not going to lean too hard on it.

e46_330i
01-17-2015, 10:43 PM
We just finished a little build here. Dealer dropped off a shiny new 2015 Denali with less than 100 miles on it. We installed a MikeL built tranny, cp3 conversion (not duals), Danville 3794 stage 2 and a lift pump. I loaded a basic tune that I've been using on my DD and WOW.



I took it for a spin and from a dead stop, it'll pull about 20' and then roast the tires through every gear until I got scared. Thing is a beast. I will dial in the tuning and have some dyno numbers, I'm really impressed. The truck is for a customer that lives out of the country and it's not broken in, so I'm not going to lean too hard on it.


You should definitely lean on her hard and post videos! Haha That Danville 3794 is an amazing VGT. Spools like a stocker, sounds amazing & flows enough for 650-700 stock fuel!


Sent from my iPhone using Tapatalk

NC-smokinlmm
01-18-2015, 04:40 AM
Could you swap a '15+ Ford cp4 pump into a LML for a little more volume or is it still better to convert to cp3?

Its best just to add a cp3 over the cp4...

quadracer37
01-26-2015, 10:57 PM
Its best just to add a cp3 over the cp4...

X2, cp3 conversion is the better way to go.

Djreversal
02-19-2015, 07:15 PM
I got a 2015 I'm building.. Just got threw the basics.. Next few steps are the expensive part.. But without labor costs.. Your looking at this

Exhaust - 500
Downpipe - 125
Lift Pump - 550
EFIlive - 900
CP3 750 + Conversion Kit = 2400 or More if you want the 12mm stroker pump for 1000whp
Trans Build - 4000
EGR full Delete Kit -750
Intake - 500
Twins and or Large Single 2500-4500

Total 12-15k

on an LML i can see you getting about 650whp reliably... I guess u could always push it a little harder but my goal is to keep it around 650whp. I don't generally abuse my truck much. Then pistons, rods, and injector upgrade, ARP hardware and all the other goodies probably another 12-15k.

quadracer37
02-19-2015, 07:39 PM
I got a 2015 I'm building.. Just got threw the basics.. Next few steps are the expensive part.. But without labor costs.. Your looking at this

Exhaust - 500
Downpipe - 125
Lift Pump - 550
EFIlive - 900
CP3 750 + Conversion Kit = 2400 or More if you want the 12mm stroker pump for 1000whp
Trans Build - 4000
EGR full Delete Kit -750
Intake - 500
Twins and or Large Single 2500-4500

Total 12-15k

on an LML i can see you getting about 650whp reliably... I guess u could always push it a little harder but my goal is to keep it around 650whp. I don't generally abuse my truck much. Then pistons, rods, and injector upgrade, ARP hardware and all the other goodies probably another 12-15k.

You can remove the downpipe, EGR delete kit,and intake from that list if your going twin turbo or single turbo upgrade route because those kits come with all those parts. :thumb:

Djreversal
02-19-2015, 08:16 PM
hmm.. Im doing a 68mm Stg2R turbo so it didn't come with any of that stuff.. but yes.. if u do a twin u can.. definitely.

quadracer37
02-19-2015, 08:40 PM
hmm.. Im doing a 68mm Stg2R turbo so it didn't come with any of that stuff.. but yes.. if u do a twin u can.. definitely.


Ahh yes if your referring to a VGT drop in then yes you would need those parts. My bad I was assuming fixed vane single turbo.

MarkBroviak
02-19-2015, 09:04 PM
We will be doing the B68mm Stg2R on our 2011 LML here at the shop next week and it is retaining all the emissions equipment. I think this turbo will allow for the better than stock driveability but increase the power potential while keeping all the emisions stuff fully functional. I will post it up as it unfolds!:thumb:

NC-smokinlmm
02-20-2015, 03:45 AM
We will be doing the B68mm Stg2R on our 2011 LML here at the shop next week and it is retaining all the emissions equipment. I think this turbo will allow for the better than stock driveability but increase the power potential while keeping all the emisions stuff fully functional. I will post it up as it unfolds!:thumb:

I need tunes.... :hug:

fast03
02-20-2015, 07:48 AM
We will be doing the B68mm Stg2R on our 2011 LML here at the shop next week and it is retaining all the emissions equipment. I think this turbo will allow for the better than stock driveability but increase the power potential while keeping all the emisions stuff fully functional. I will post it up as it unfolds!:thumb:

This is very interesting Mark. With California smog checks, I am super leary of pulling my equipment. I don't want to get pulled over and get a multi thousand dollar ticket and it is a pain to put it back on every 2 years. Are you thinking this set up might actually reduce regens?

MarkBroviak
02-20-2015, 03:59 PM
This is very interesting Mark. With California smog checks, I am super leary of pulling my equipment. I don't want to get pulled over and get a multi thousand dollar ticket and it is a pain to put it back on every 2 years. Are you thinking this set up might actually reduce regens?

I'm hoping so! It seems to have helped on the few I have done here in person so we shall see.

MAXX IT OUT
02-20-2015, 04:39 PM
So will a exhaust cut out somehow find its way into the exhaust system?:roflmao:

MarkBroviak
02-21-2015, 06:54 AM
So will a exhaust cut out somehow find its way into the exhaust system?:roflmao:

Nope, no need for that! Here is a good video to show why this turbo will take care of the under boost/reduced engine power codes on lmm/lml trucks. https://www.youtube.com/watch?v=Gtbwhj1eYa4&list=UUV6Kphz6imzjrc9kM2sCV6A

56taskforce
02-21-2015, 07:31 AM
Dam Mark the background music made me feel like I was watching turbo porn :roflmao::angel:

MarkBroviak
02-21-2015, 08:10 AM
Dam Mark the background music made me feel like I was watching turbo porn :roflmao::angel:

Yeap, love my BPM on XM!!!:D

Djreversal
02-21-2015, 01:36 PM
mark i was going to order this turbo for my truck. but i think I'm going to do my Cp3 Conversion first... Possibly transmission 2nd... then turbo last... Sucks.. because all i want is that crazy whistle... but i think its smarter for me to do it this way.

fast03
02-23-2015, 08:53 AM
I'm hoping so! It seems to have helped on the few I have done here in person so we shall see.

I will be watching this thread. Adding HP and staying legal would be really cool. will this set up still need a downpipe?

Brassfield
02-23-2015, 09:25 AM
Mark will you be tuning the 2011 then??

quadracer37
02-23-2015, 09:28 AM
will this set up still need a downpipe?

yes you'll need a lbz/lmm style downpipe, with the 9th injector and EGT bungs you would find in an LML factory downpipe.

PureHybrid
02-23-2015, 10:47 AM
Nope, no need for that! Here is a good video to show why this turbo will take care of the under boost/reduced engine power codes on lmm/lml trucks. https://www.youtube.com/watch?v=Gtbwhj1eYa4&list=UUV6Kphz6imzjrc9kM2sCV6A

You're going to wear out that boost gauge!