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2014 tune vs 2015 tune

Almoalla6997

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Almoalla6997 Enthusiast

Almoalla6997

Posted
Posted

So I have a friend that proved that there are several differences in the 2015 sierra tunes.

The question is wether GM would update the 2014 tunes to 2015? If they are surely better as they see it?

MMC Enthusiast

MMC

Posted
Posted

2014 models are Flexfuel 2015's are not.

robvas Enthusiast

robvas

Posted
Posted

2014 models are Flexfuel 2015's are not.

Both 2014 and 2015 V6's are Flex fuel

All the 2014 5.3's are Flex fuel. In 2015 it became a $100 option

The 6.2 isn't Flex fuel in either year

jasch1124 Enthusiast

jasch1124

Posted
Posted

2014 models are Flexfuel 2015's are not.

I don't think this is accurate information. From the information I gathered it was standard in 2014 models (except 6.2L) but in the 2015MY it became a $100 option depending on engine selection.

 

If you were curious I started a thread not to long ago that discusses a few more details about this. http://www.gm-trucks.com/forums/topic/174737-does-my-silverado-take-e85flexfuel/

 

As for OPs original question, I'm not sure what was tuned but there are some threads on here about how Stock 2014's shift funny/clunky and the 2015's don't seem to. Unfortunately I have no data confirm that other than the threads I've read on here written by other users.

MMC Enthusiast

MMC

Posted
Posted

Thanks to you all, I'm aware that Flexfuel is available on 2015's but my point was that it is not on all 2015's so the fuel system and tunes may not be the same across the board. I also doubt that there have been any calibration changes to the 15's because that requires validation /certification and that's an expensive process.

How many of you added the Flexfuel option to your order or have it off the lot?

irish4life8911 Enthusiast

irish4life8911

Posted
Posted

Thanks to you all, I'm aware that Flexfuel is available on 2015's but my point was that it is not on all 2015's so the fuel system and tunes may not be the same across the board. I also doubt that there have been any calibration changes to the 15's because that requires validation /certification and that's an expensive process.

How many of you added the Flexfuel option to your order or have it off the lot?

My '15 GMC Sierra 1500 SLT All Terrain CCSB w/ flex fuel was sitting on the lot.

jasch1124 Enthusiast

jasch1124

Posted
Posted

Thanks to you all, I'm aware that Flexfuel is available on 2015's but my point was that it is not on all 2015's so the fuel system and tunes may not be the same across the board. I also doubt that there have been any calibration changes to the 15's because that requires validation /certification and that's an expensive process.

How many of you added the Flexfuel option to your order or have it off the lot?

My '15 Chevrolet Silverado LTZ was sitting on the lot and I do not have FlexFuel.

2016 Sierra Owner Senior Enthusiast

2016 Sierra Owner

Posted
Posted

By tunes do you mean transmission or engine or both? Because I would think that having the Flexfuel option has nothing to do with the transmission shifting tune anyway.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

All manufacturers make refinements year over year and sometimes within a model year. You won't ever see these as an across the board update nor will you likely be able to get a friendly dealer to help out as any "official" tune will require a VIN.

MMC Enthusiast

MMC

Posted
Posted

Flexfuel vehicles have the ability to produce more power (383 gas 416 E85 lb-ft) than non Flex and to protect the driveline may require different calibrations (torque management). Just speculation on my part.

WendysOrBust Enthusiast

WendysOrBust

Posted
Posted

I like how OP is talking about different tune calibrations and somehow all of you guys are harping about 2014 vs 2015 flex fuel options.

  • 1 month later...
Almoalla6997 Enthusiast

Almoalla6997

Posted
  • Author
Posted

Thank you guys but really flex fuel or not isnt my concern though. I am asking about calibrations here.

 

Gas milage is it better in 2015 vs 2014 because of different calibrations?

Power gains 2015 vs 2014?

f8l vnm Senior Enthusiast

f8l vnm

Posted
Posted

Does the 15 have the confused trans ? Does it clunk in low speed driving around 10 mph when you take your foot out of gas? Main question for me :)

Almoalla6997 Enthusiast

Almoalla6997

Posted
  • Author
Posted

Does the 15 have the confused trans ? Does it clunk in low speed driving around 10 mph when you take your foot out of gas? Main question for me :)

Yes it does clunk with me.

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