Went to TTS Power Systems today to get a test version of their prototype towing tune for the LLY Duramax.

The owner, Steve Cole, was very friendly and informative. He showed me around his shop, then handed me the keys to his LLY shop truck with the tow tune in it. Very smooth and predictable engine output, and NO doubt that it runs harder than a stock LLY. Zero indication the truck is modified. No smoke, no surging, no noise.

I saw the dyno sheets he ran on it, and it is a 50rwhp tune. The gain is pretty much across the board.

So he pulled my PCM and uploaded the tune into it. All gauges work correctly, idles the same, sounds the same. I did some stoplight stomps, some freeway blasts, and there is no doubt there is more power. It appears the DIC fuel mileage might be more optimistic than before. I will fill up and measure actual mileage.

I am going to tow a large race trailer to Vegas and back, then check the output at my local dyno, and run it at the dragstrip in the next couple of weeks. I'll post results.

So far, so good.

 

cool, my dad just ordered a '04 LLY crewcab, 4x4. He gets it May 15th

 

Does first gear feel like its got any more power?Keep us updated.

 

sounds good. Let us know how it runs on your trip.

 

More power everywhere. Very smooth. I'd like to point out some drawbacks for this mod, but I can't find one yet. Everything you like about the Duramax, but just more and smoother.

 

Does TTS make those insane PCM tunes for the D-max also?

With that, would there be any reason to stack programming [(when available)(like the Edge Hot OJ and Quad 215)]?

 

It's a PCM tune. You can stack anything you like, if your trans is built and you don't exceed max cyl pressure.

This is not radical tune, it's a daily driver tow tune.

 

Well yeah I know it's a PCM tune. What I want to know is... can they make you a program so you don't need stacking modules? Like get as much power as you want from the PCM?

 

There are PCM tunes out there for the LB7 (earlier version Dura) that can really rock IF you've prepared the trans, can control turbine temps, and avoid folding the front suspension in half.

At some point, they will release such tunes for the LLY. For now, this is the only tune that exists. The LLY has twice the ram and a totally different PCM, so it will be a lot of work to get tunes developed.

The TTS LB7 shop truck ran 12.3 at Fontana on #2 only. Fontana isn't even a fast track. I'm sure similiar #'s will be available for the LLY in the future.