LML Duramax Diesel Tuning - 5 Questions & Answers

Thedpfdeleteshops.com presents the five most common questions about LML tuning (, upbeat, music, ). The first most commonly asked question we get relates to mileage Both what mileage I can expect. When I buy the truck and what mileage I can expect, when I tune the truck Now, you’ve got ta understand from our side. There’S just so many variables that play into this 

There’S the climate where you live, there’s your driving style!

There’S what tires are on the truck? Are you towing or not? What does your commute look like Right? So all these things play in Now on a truck that typically gets 15 or 16 miles per gallon, which is pretty normal in a temperate climate, reasonably driven truck unloaded. It wouldn’t be uncommon to see another mile per gallon or mile and a half per gallon out of our tuning 

 

Are we gon na promise you that 

Of course, not Your driving style, anything any of those variables that I mentioned earlier can play into that and skew that number Now, where we really see gains in mileage, comes in the situation where we can lower the mean operating RPM of the engine.

 

So if you’re lightly, loaded or you’re, causing the truck to downshift with a trailer behind it, a situation where we add the tune and we really fatten up that torque curve. We allow you to run in the same higher gear for longer And when we can allow you to run in the same gear for longer or run in the higher gear, we can lower the RPM and lower the parasitics on the engine. 

Any time we can do that, we can save you fuel So light loads with light tow tune or heavy tow tune. Typically, the best situation for saving you money on fuel Number, two commonly asked question we get relates to TCM tuning 

 

So you’ve read about the ECM tuning. You understand how that works now you’re asking about transmission tuning and how does that affect the way the truck drives When we build the ECM calibration, we alter the torque curve.

 

So that means that we bring more torque in at lower RPM. We widen the torque curve, we fatten it up and we also raise the torque curve. So you make more peak torque at most points in the rev range. 

As you do that the transmission calibration benefits from being matched to that changed torque curve, so by tuning the TCM, the transmission is able to anticipate the torque load from the engine. 

As it anticipates the torque load, it can understand what the shift pressure should be.

 

It understands when to downshift, so when you’re calling for more torque than the truck can make at that RPM and a downshift is needed and understand. That’S different than a stock calibration is versus a tune calibration And then the torque converter clutch lock-up strategy When the torque converter clutch locks up or applies to put that power to the rear, tires and really hunker down. Give that diesel torque feeling that you’re used to on a tuned truck setting up to match the tuned torque curve is something that we can do through TCM tuning. Only. The third question relates to LSP tuning for our switchable platform.

On the previous model year, trucks we called it DSP on the LML, it’s called LSP and really what it is is an ability to switch between different torque curves. Depending on what your usage is for the truck. Now you can switch on the fly using the supplied switch, all you have to do is reach down, adjust the dial and it switches in real time. 

 

Now previously on the truck, we required you to stop turn the truck off and go through a one minute, reflash to change the power level. The fourth question relates to deleting emissions equipment.

It’S the taboo question. It’S no secret that in the after market, the ability to delete emissions equipment exists and is available. 

What I would ask you to do before you consider tuning your truck is to consider the needs that you personally have for the truck and the benefits that you want out of the truck before you decide to delete emissions equipment By leaving the emissions equipment on the Truck you maintain a quiet truck. You maintain a smokeless truck. You maintain a truck that is in compliance with road laws, so you’re not subject to fines by the DOT or anybody on the road and then resale value.

So By resale value I mean most dealerships will not take a deleted truck on trade. It’S also noteworthy that it’s much more difficult to undelete a truck than it is to delete a truck 

 

If you drive a truck, that’s been deleted through a winter odds, are that most of the connectors are corroded to the point where you need to replace all the corroded connectors. So you really narrow your resale market. 

For most users, I don’t see the advantage Power wise you’re within five seven horsepower very small number. You would not notice seat of the pants we’ve tested on the DYNO back to back emissions equipped truck versus deleted truck at the 520 530 rear wheel, horsepower level.

It’S less than you’d be able to detect in the seat of your pants As far as overall performance of the truck drive, it first Put a tune on it most of the benefits that people who are telling you to delete your truck most of the benefits. You’Re gon na realize from tuning the truck can be realized from tuning without deleting instead of tuning and deleting The fifth and final question coming off of this delete. Discussion comes the warranty discussion. 

Is tuning going to void my warranty, It really depends on the degree of the warranty work being done. 

So if you have an axle sealer, if you have a broken spring in your glovebox or if you have a door seal, that’s leaking or a battery, that’s bad.

 

These sort of things are not caused by tuning and are as such, not relatively sought out to see. If you’ve had tuning on the truck before they approve a warranty claim, So our experience has been that most guys, who have tuned trucks, really have no warranty issue when they go to the dealer to have routine things fixed. That is things that aren’t caused by the tuning 

What I would do, if I were you, talk to the service writer They’ll, give you an indication good or bad, how they lean, and you can make your decision from there Now understand. If you get to the point where you need a replacement transmission or you have a major catastrophic failure with the truck, however, rare these things do occasionally happen. If you have something like that happen, odds are it’s gon na be escalated up the chain to regional 

If it gets escalated to regional, then they’re gon na check and see if the truck’s ever been tuned, then the odds of a warranty claim being denied are much higher.

So there you are the front and back of it, 

A little more to the story, a little more gray than black and white. I appreciate you taking the time to listen to me answer these five commonly asked questions about the LML 

We have a lot of time and energy invested in LML tuning and performance most commonly in our DT520 pack and in our LSP switchable tuning for the LML. If you have any questions relating to what we talked about here or about tuning your truck specifically, please give us a call 815-568-7920 and me, and my staff would be happy to talk to you about any of these things. I’M Nick thanks for watching 

For more information visit, The Diesel Tuner’s Blog located on the web at blog.dpfdeleteblog.com