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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-19-2015, 07:52 PM   #1 (permalink)
Tom S.
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Throttle Response

While my truck has a lot of power, I am underwhelmed when it comes to the throttle response, especially from a stop. I drove a friend's 2014 gasser and the response was night and day difference. In fact I had to be careful parking it was so responsive.

I know these things are drive by wire, but is there anything that can be done help them be more responsive? BD used to make a rather pricey box that was supposed to help, but I don't see it advertised any more and they don't seem to want to answer email.

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Old 12-19-2015, 08:05 PM   #2 (permalink)
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Only a tune will help this. Duramax tuner has emissions intact tunes which substantially improve this, but regen frequency will increase if you also set the tune for higher overall power levels. A delete tune will do an even better job of eliminating the "dead pedal" and of course regens are no longer an issue.

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Old 12-19-2015, 08:27 PM   #3 (permalink)
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I don't get to drive me much in the ice and snow, but wouldn't the progressive throttle be less likely to get away from you when trying to go in the snow and ice. I'm used to my 06 LBZ and we test drove a 2015 Jeep Grand Cherokee and it was so sensitive, that would be afraid to drive it in the snow.
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Old 12-19-2015, 09:11 PM   #4 (permalink)
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Try an aftermarket lift pump and air intake. There have been multiple reports of improved dead pedal response after just these upgrades. it also won't void the warranty
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Old 12-19-2015, 09:57 PM   #5 (permalink)
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Simple!

Push.......pedal.......down.......farther.




j/k Tom....dead pedal is a real problem on those LMLs.
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Old 12-19-2015, 10:34 PM   #6 (permalink)
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The trade off is that the LML is much easier to move around at slow speed with out unnecessary wheelspin on poor traction surfaces (like gravel parking and turn around areas).

The response is there if desired, just have to push the pedal further to begin to access it.
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Old 12-20-2015, 07:39 PM   #7 (permalink)
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Big part of it is the lazy GM programmed throttle mapping vs previous gen trucks. Either tune as mentioned, or a warranty friendly closest alternative is something like the BD Throttle Booster. Dead pedal is still there but the pedal response overall is much improved.
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Old 12-20-2015, 08:24 PM   #8 (permalink)
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The Sprint Booster / electronic throttle amplifier only helps if the throttle is never pressed too far, i.e. only at low throttle levels. Remember it cannot apply more than 100% throttle.

I've also heard some air scoops help. One fellow on the other forum did a writeup on the Banks scoop. Despite some fit and finish issues it did help throttle response somewhat.

I'd be interested in trying the lift pump as well. Something I'll probably need eventually anyway.
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Old 12-21-2015, 01:27 AM   #9 (permalink)
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Quote:
Originally Posted by Armus View Post
The Sprint Booster / electronic throttle amplifier only helps if the throttle is never pressed too far, i.e. only at low throttle levels. Remember it cannot apply more than 100% throttle.

I've also heard some air scoops help. One fellow on the other forum did a writeup on the Banks scoop. Despite some fit and finish issues it did help throttle response somewhat.

I'd be interested in trying the lift pump as well. Something I'll probably need eventually anyway.
Try driving on the freeway with the Tow/Haul switch on, that'll seem to some of the lag out. It won't be as good as a delete tune, but it will help.
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Old 12-21-2015, 08:59 AM   #10 (permalink)
Tom S.
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I'm not sure (or convinced for that matter) why changing the air system or adding a lift pump would help. I'm looking at low end response - like 0 to 10 MPH. Neither lift pump or air system should have any effect at that point. Note I'm not looking to do burnouts, just more response. I did find a BD unit on line from a third party but at $270, it's pricey for being a 'possible' fix. I also find it strange that it's not even listed on the BD web page.

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