Just got new 2014 Sierra - questions on aftermarket

crushNchowda · August 23, 2013

Hey new to forum. I'm a pretty loyal GM guy, just traded in my 2008 G8 GT (fully bolted, 345whp/356tq on a stingy as hell mustang dyno - 358 on a dynojet) that I put 120,000 miles on for a new 2014 Sierra SLT crewcab w/ bose/navi/preferred summit white w/ black leather. I previously had a fully bolted 2004 GTO as well.

I have already put 2400 miles on the truck and purchased it 7-30. I drive up/down New England for work, averaging about 18 mixed city/hwy.

LOVE the truck. Have added 20% tint on front windows, got weathertech digital fit floormats all around and rain visors for the front windows, I'm also adding a flowmaster Force II catback exhaust and undercoating the truck as well - I plan on keeping it a long time.

The truck has the 18" rims which are OK, but I plan on throwing snows on those once the stock CRAP goodyear fuelmax tires are shot, and going w/ Bilstein 5100 leveling shocks and some 20" rims and an all terrain tire.

Was wondering if anybody has attempted to crack the ECM on these yet for tunes? I imagine w/ the new VVT, direct injected motors this will be slow to happen.

Does anyone else have a catback on their truck yet? I'm a little worried that it will sound like garbage in 4 cyl mode (my G8 did so I tuned it out, my dad's '07 silverado w/ magnaflow did too) and that it could drone and effect bluetooth function, but the overall quietness of the cabin may makeup for it I hope.

I thought about waiting on the 6.2 motor, but w/ miles continually racking up on the G8 and a great trade in offer ($12,000) I couldn't resist. Also, coming from my G8 and GTO - no big draw to go after the bigger motor since no matter what these trucks are incredibly slow in comparison to a 4 door muscle sedan turning out 12.7 1/4's on street tires.... LOL!

b1gted · August 23, 2013

Congratz on the new truck!

As far as your question on ECM, there is a thread on here about the Diablosport Intune:

http://www.gm-trucks.com/forums/topic/153024-diablo-sport-2014-support-released/

GMC-AT · August 23, 2013

I read a lot about these tunes and ECM stuff that people do to their new trucks. I can't believe this doesn't this void your warranty ?

crushNchowda · August 23, 2013

I read a lot about these tunes and ECM stuff that people do to their new trucks. I can't believe this doesn't this void your warranty ?

It really depends on the dealer, but for the most part unless you're A) drag racing/road racing on a daily/weekly basis, or B) pushing the trailering/hauling abilities to the limit on a regular basis you won't have any failures as a result of said tuning so they can't void the warranty if they can't prove the mod caused the failure. Case in point - my G8 came down w/ a harsh/flare 2-3 shift - this was a common problem that reared its head more often after tuning the car, but the dealer still performed the TSB under the powertrain warranty. A custom dyno tune on an LSx based motor for the TCM/ECM can transform a vehicle, for the better, hence the popularity. There's alot of untapped potential from the factory floor.

Carder09 · August 23, 2013

I would look into Black Bear Performance for a custom tune.

Joe_K · August 23, 2013

Hey new to forum. I'm a pretty loyal GM guy, just traded in my 2008 G8 GT (fully bolted, 345whp/356tq on a stingy as hell mustang dyno - 358 on a dynojet) that I put 120,000 miles on for a new 2014 Sierra SLT crewcab w/ bose/navi/preferred summit white w/ black leather. I previously had a fully bolted 2004 GTO as well.

I have already put 2400 miles on the truck and purchased it 7-30. I drive up/down New England for work, averaging about 18 mixed city/hwy.

LOVE the truck. Have added 20% tint on front windows, got weathertech digital fit floormats all around and rain visors for the front windows, I'm also adding a flowmaster Force II catback exhaust and undercoating the truck as well - I plan on keeping it a long time.

The truck has the 18" rims which are OK, but I plan on throwing snows on those once the stock CRAP goodyear fuelmax tires are shot, and going w/ Bilstein 5100 leveling shocks and some 20" rims and an all terrain tire.

Was wondering if anybody has attempted to crack the ECM on these yet for tunes? I imagine w/ the new VVT, direct injected motors this will be slow to happen.

Does anyone else have a catback on their truck yet? I'm a little worried that it will sound like garbage in 4 cyl mode (my G8 did so I tuned it out, my dad's '07 silverado w/ magnaflow did too) and that it could drone and effect bluetooth function, but the overall quietness of the cabin may makeup for it I hope.

I thought about waiting on the 6.2 motor, but w/ miles continually racking up on the G8 and a great trade in offer ($12,000) I couldn't resist. Also, coming from my G8 and GTO - no big draw to go after the bigger motor since no matter what these trucks are incredibly slow in comparison to a 4 door muscle sedan turning out 12.7 1/4's on street tires.... LOL!