Not sure why I didnt think to turn down the music..... But you get the point. This thing really goes now!!

Truck is a 2011 Denali HD 2500 with 295/55-20 tires. Have not corrected the speedo yet, but according to GPS, it is only reading 3 or 4mph low at 75mph..... 4" Cat-back, no muffler.

I tried the best I could to roll onto the throttle slower at the start to avoid spinning through the first 100 feet.... I have no desire to run it in 4wd and hold it back for the best launch...

No animals were harmed while making this video....

YouTube - H&S tuned LML 0-95 pull

:cool2:

I think the radio is good, shows that it wasn't edited to make it look quicker to 95. Looks like 0 to 95 in 12.00; impressive!

which tune was this? The extreme/hottest tune?

Why a cat back kit not Turbo back nice run post a sound clip!

Very Nice. I'll take one!

Why a cat back kit not Turbo back nice run post a sound clip!

Nothing available for the LML yet, post up if you are aware of one i'll be interested.

Can't WAIT until they release the stainless exhaust!! That's all I'm waiting for before I have one on it's way!

Nothing available for the LML yet, post up if you are aware of one i'll be interested.

http://www.dieselplace.com/forum/showpost.php?p=4232582&postcount=6

which tune was this? The extreme/hottest tune?

It was the "Hot" tune.....Which is the most extreme level

Why a cat back kit not Turbo back nice run post a sound clip!

http://www.dieselplace.com/forum/showpost.php?p=4232582&postcount=6

I was thinking I wanted a DP-back with a muffler, however, H&S told me that it was not available yet. I did not want the truck too loud, and I got what I wanted with leaving the cat in and straight pipe from there back. Truck has a nice, deep tone to it, without being too loud.

Eric she looks like she gits n shits now, gonna have to take me for another ride

^ It does for sure. Not quite at the level of your truck, but it definitely woke it up! Hopefully see some Trans pieces become available before this one goes to pieces...

First post on here??

ya been on duramaxforum for a while but just joined here and idk that thing would give mine a run for its money, just had ben "duratothemax" put full trans kit in mine runs great. But ben i might need some efi live to pull away from that thing. i dont think you should have to worry about trans yet but idk

Just ran mine with watch you deff got me beat, think id be with ya till 60 or a bit more but you seem to pull alot harder on top....guess I should expect that though with you starting with 100 hp more stock, let me know when you get bored and wanna sell it :)

Sent from my DROID2 using AutoGuide App

http://www.dieselplace.com/forum/showpost.php?p=4232582&postcount=6

We were referring to why there was a cat back and NOT a full straight turbo back. Flo pro only offers a down pipe back/cat back which is the same thing cause the cat/urea injector is part of the downpipe. A straight downpipe for LML needs to be produced, I read in a different thread they are different than the LMM and would require mods.

We were referring to why there was a cat back and NOT a full straight turbo back. Flo pro only offers a down pipe back/cat back which is the same thing cause the cat/urea injector is part of the downpipe. A straight downpipe for LML needs to be produced, I read in a different thread they are different than the LMM and would require mods.

There is no such thing as a true turbo-back exhaust. A turbo-back exhaust is really a downpipe back exhaust. Yes, you can also replace the downpipe, and then you would have a "turbo-back" exhaust.

The cat is not part of the downpipe. It is in the front pipe. The 9th injector is in the DP though. There is no reason to replace the downpipe just to get rid of the 9th injector. Once you shut off the regen with a programmer, it'll just sit there and not do anything. Flo-pro offers a catback, and a DP back. The cat back bolts on to the flange on the front-pipe right after the DOC. The DP back bolts onto the DP with the v-band clamp.


Here's a little description for the exhaust names for those that don't know....

Up-pipe--> Goes from the manifold up to the turbo.
Down-pipe--> Goes from the turbo, down the back of the engine, and connects to the front-pipe.
Front-pipe--> The pipe that connects to the DP(in front of where the passenger's feet would be), contains the DOC, and connects to the mid-pipe(a little bit behind the front passenger seat).
Mid-pipe--> Contains the DPF/SCR, and is in between the front-pipe and tail-pipe.
Tail-pipe--> Connects to the mid-pipe(a little bit behind the area where the bed meets the cab) and goes out the rear of the truck.

Just ran mine with watch you deff got me beat, think id be with ya till 60 or a bit more but you seem to pull alot harder on top....guess I should expect that though with you starting with 100 hp more stock, let me know when you get bored and wanna sell it :)

Sent from my DROID2 using AutoGuide App

It will be a couple years before I will be bored with it.....however, they have your new truck for sale in whitehall NY. Brand New 2011 Silverado LT 2500HD, Duramax, 6" lift, Bushwacker flares, 20" BMF wheels, didnt look at the tires.... Black on black. Awesome looking truck.

There is no such thing as a true turbo-back exhaust. A turbo-back exhaust is really a downpipe back exhaust. Yes, you can also replace the downpipe, and then you would have a "turbo-back" exhaust.

The cat is not part of the downpipe. It is in the front pipe. The 9th injector is in the DP though. There is no reason to replace the downpipe just to get rid of the 9th injector. Once you shut off the regen with a programmer, it'll just sit there and not do anything. Flo-pro offers a catback, and a DP back. The cat back bolts on to the flange on the front-pipe right after the DOC. The DP back bolts onto the DP with the v-band clamp.


Here's a little description for the exhaust names for those that don't know....

Up-pipe--> Goes from the manifold up to the turbo.
Down-pipe--> Goes from the turbo, down the back of the engine, and connects to the front-pipe.
Front-pipe--> The pipe that connects to the DP(in front of where the passenger's feet would be), contains the DOC, and connects to the mid-pipe(a little bit behind the front passenger seat).
Mid-pipe--> Contains the DPF/SCR, and is in between the front-pipe and tail-pipe.
Tail-pipe--> Connects to the mid-pipe(a little bit behind the area where the bed meets the cab) and goes out the rear of the truck.

Ah ic, I was getting confused in the terminology, forgot about the frontpipe.

Look at Flo Pros so called downpipe back exhaust, its actually only a cat back.

http://www.flopro.com/FBML/2011gmc/123.png

Ah ic, I was getting confused in the terminology, forgot about the frontpipe.

Look at Flo Pros so called downpipe back exhaust, its actually only a cat back.

Yeah....you're right on that one. I was just going by what the vendor said. Either they posted the wrong pics on their site or they don't have a DP-back exhaust yet.

So who has done a LMM down pipe back exhaust on a LML? I read it somewhere on the web, think it was posted by powerlabs. I want to get rid of it ALL.
Tim Adams

Runs good and and good song

Does this tuner also disable the traction control on these trucks? Also looks like a lot of defuel on the shifts, or is that the traction control holding it back? Did you have the convertor locked on this run? I couldn't see the tach so I couldn't tell if it locked at 25mph?

Does this tuner also disable the traction control on these trucks? Also looks like a lot of defuel on the shifts, or is that the traction control holding it back? Did you have the convertor locked on this run? I couldn't see the tach so I couldn't tell if it locked at 25mph?

anytime you go wide open the converter locks and stays locked.......

that defuel is more in the TCM than the ABS/traction control module.

Flo~pro will have a DP available very soon. :D

anytime you go wide open the converter locks and stays locked.......

that defuel is more in the TCM than the ABS/traction control module.


I know the converter locks at WOT but he said he rolled into it so that is what led me to the question. My truck is stock and even holding the traction buton to turn it all off still does not turn it off. It will seriously defuel and cut the torque to keep the tires from spinning. I also noticed the speedo stopping at certain points and was curious of the reason.
A) defuel in the tune?
B) defuel in the TCM?
C) Traction Control limiting wheel speed?
D) All of the above?

Tranny shifting gears maybe?

Fast truck man! Awesome!!

I know the converter locks at WOT but he said he rolled into it so that is what led me to the question. My truck is stock and even holding the traction buton to turn it all off still does not turn it off. It will seriously defuel and cut the torque to keep the tires from spinning. I also noticed the speedo stopping at certain points and was curious of the reason.
A) defuel in the tune?
B) defuel in the TCM?
C) Traction Control limiting wheel speed?
D) All of the above?

Converter locked up in second gear and then stayed locked as far as I could tell. It does defuel a ton when it shifts....more so in the higher gears. Probably a good thing for transmission health. It is not because of the traction control. IMO It is the TCM strategy that causes it.

its the TCM. Anyone with a 2011, pull your ABS and VSES fuses, do a burnout or something and I bet you'll still see the same defuel.

DO NOT drive with these fuses pulled, you'll have no front/rear brake proportioning, no ABS, etc... Anything more than "moderate" brake pressure at speed with these fuses pulled could be dangerous.

Converter locked up in second gear and then stayed locked as far as I could tell. It does defuel a ton when it shifts....more so in the higher gears. Probably a good thing for transmission health. It is not because of the traction control. IMO It is the TCM strategy that causes it.


Thanks for the info, how about on the lower tunes? I'm sure the defuel is present but to what extent? Also what are tune ratings?

its the TCM. Anyone with a 2011, pull your ABS and VSES fuses, do a burnout or something and I bet you'll still see the same defuel.

DO NOT drive with these fuses pulled, you'll have no front/rear brake proportioning, no ABS, etc... Anything more than "moderate" brake pressure at speed with these fuses pulled could be dangerous.

x2... Highly unlikely you will be spining the tires through a 1-2 or 2 -3 shift. The TCM delievers a torque request during shift to prevent damage and clunks/bumps. I do not see the TCS light flashing in the video..

That is bad ass!!!

So who has done a LMM down pipe back exhaust on a LML? I read it somewhere on the web, think it was posted by powerlabs. I want to get rid of it ALL.
Tim Adams

a lmm or older turbo back will work with some minor mods a lmm downpipe will also work with a few tweaks nothing major so if your wanting one get a de downpipe get your hands dirty an a front pipe an there you go trubo back kit :thumb:

What were your egt's like during this run?

what were your egt's like during this run?

x2??

What were your egt's like during this run?

1480 was the max recorded

1480 was the max recorded

Sorry if this is a stupid question, I'm new to the D'max world and Diesels in general, but isn't that pretty high? Is that still well withing the "safe" range?

-TJ

Sorry if this is a stupid question, I'm new to the D'max world and Diesels in general, but isn't that pretty high? Is that still well withing the "safe" range?

-TJ

In the 1400s is not bad if it is short periods of time. You wouldnt want to be towing up a long grade with sustained EGT temps over 1400. IIRC 1600 degrees and above is when you really should be worried even for short runs....

That 1480 was just the max recorded spike. It backs down to under 1400 a few seconds after..... It only hits that high for a second or two on a WOT pull like that.

No thanks, to hot for me. I keep it below 1300, don't need a 50K paperweight.

No thanks, to hot for me. I keep it below 1300, don't need a 50K paperweight.

Your stock LML is rated at 1365 degrees so you better detune it some;)

Down-pipe--> Goes from the turbo, down the back of the engine, and connects to the front-pipe.

That's actually the Turbo Direct Pipe. The down pipe connects to the Turbo Direct Pipe at the vband clamp and makes the turn to start heading toward the back of the truck.

No thanks, to hot for me. I keep it below 1300, don't need a 50K paperweight.

Do you ever have anything good to say?

I will say hot tuning and 1400 isn't that bad with a stock turbo. I would be touching 1500+ on my LBZ with EFILive race tuning.

Do you ever have anything good to say?

I will say hot tuning and 1400 isn't that bad with a stock turbo. I would be touching 1500+ on my LBZ with EFILive race tuning.

It seems like LMM owner is just pissed something newer and better than his LMM is out there.

-TJ

That's actually the Turbo Direct Pipe. The down pipe connects to the Turbo Direct Pipe at the vband clamp and makes the turn to start heading toward the back of the truck.

Um....no. The downpipe is a pipe that goes down(creative name, eh?) from the turbo. The front pipe, ironically placed at the front of the exhaust system, connects to the downpipe at the v-band clamp.

It seems like LMM owner is just pissed something newer and better than his LMM is out there.

-TJ

According to his sig.....he has an LML.

Um....no. The downpipe is a pipe that goes down(creative name, eh?) from the turbo. .

Um... no. It's actually a turbo direct pipe. Downpipe gets misused all the time. Not that it matters I guess :rolleyes:

Um... no. It's actually a turbo direct pipe. Downpipe gets misused all the time. Not that it matters I guess :rolleyes:

No it's not, listen to what there telling you... You have it wrong

i figured since no one will take my word for it, that I'd search google for something to back me up. Funny enough, the first hit was a thread here on DP: http://www.duramaxforum.com/forum/performance-upgrades/5997-turbo-back-vs-direct-pipe.html

Have a read and learn something.

i figured since no one will take my word for it, that I'd search google for something to back me up. Funny enough, the first hit was a thread here on DP: http://www.duramaxforum.com/forum/performance-upgrades/5997-turbo-back-vs-direct-pipe.html

Have a read and learn something.

I think you need to do a little reading and learning yourself... Read the 5th post in your link that sums it up. Yes the Downpipe can be called a turbo direct pipe (as Diamond Eye calls it) most everyone calls it a down pipe, but the front pipe is sure the hell not called the downpipe as you said before

no. Read post 9.

Diamond Eye also calls the next pipe the down pipe - as I said. MBRP too - just looked. Interestingly enough, some places are now including the word downpipe in descriptions - ie "exhaust front downpipe" for the downpipe below the TDpipe and "turbo downpipe" for the TDpipe. I think it's likely because of so much misuse and misunderstanding. Kind of like putting slang in the dictionary, lol.

no. Read post 9.

Diamond Eye also calls the next pipe the down pipe - as I said. MBRP too - just looked. Interestingly enough, some places are now including the word downpipe in descriptions - ie "exhaust front downpipe" for the downpipe below the TDpipe and "turbo downpipe" for the TDpipe. I think it's likely because of so much misuse and misunderstanding. Kind of like putting slang in the dictionary, lol.

Lol do you not see that he is a bit confused?? Read a bit further into the post he says the other guy is right and he is new to the Dmax. Your taking your info from a new guy back in 08. But whatever call it what you want but 99% of the people on here will disagree with you.

Back on topic

No biggie... I knew what it was long before that thread. You are right though - we're hijacking this thread with nonsense. Back on topic - sorry all.

:popcorn: