Reflash ECM for Speedometer Recal vs Power Train Warranty???

Retro69 · 10-22-2018, 07:15 PM

I’m pretty sure I know the answer to this one but gotta ask anyway.

I want to buy some BFG Comp2 A/S for driving in the cold, wet months but they only come in 35 profile. My speedometer would be off 3-4 mph which would really bug me.

If I have the ECM reprogramed to adjust the tire size on my 2018 ZL1 do I risk voiding my power train warranty?

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nighttowl · 10-22-2018, 10:08 PM

They can do this at the dealership.

I would definately not re-flash the ECU if you are concerned about maintaining your warranty.

Camaro_QC · 10-22-2018, 10:10 PM

But then you would have to have it reprogrammed after the cold months... All that every year. Maybe not worth it?

Inspector 17 · 10-22-2018, 10:21 PM

Why not just run the Pirelli Winter SottoZero 3? They come in the OEM sizes.

Retro69 · 10-22-2018, 10:31 PM

Quote:

Originally Posted by Inspector 17

Why not just run the Pirelli Winter SottoZero 3? They come in the OEM sizes.

Well that is an option for sure but they are over $1,000 more expensive. Yikes!

Retro69 · 10-22-2018, 11:02 PM

Hrm... looks like a 305/35R19 is pretty darn close in size to the 305/30R20. It'll take a one-time wheel purchase but that might be a better solution.

Inspector 17 · 10-23-2018, 10:57 PM

Quote:

Originally Posted by Retro69

Well that is an option for sure but they are over $1,000 more expensive. Yikes!

Granted; no tire options for this car are cheap by any means. But they are more affordable than say the Z06. Plus, running the same size tires means not having to reflash the ECU and worrying about warranty issues every 6 months. I guess it's what's worth it in your particular case.

itsadryheat79 · 10-24-2018, 05:14 PM

Quote:

Originally Posted by Inspector 17

Granted; no tire options for this car are cheap by any means. But they are more affordable than say the Z06. Plus, running the same size tires means not having to reflash the ECU and worrying about warranty issues every 6 months. I guess it's what's worth it in your particular case.

I ran those BFGs Comp2/AS on my 12 ZL1 really like them especially for the price you cant beat them. I did not drive in snow but they are like 1/2 the price and did great for daily type driving in colder wet driving conditions.

TJay74 · 10-25-2018, 08:16 AM

Quote:

Originally Posted by nighttowl

They can do this at the dealership.

I would definately not re-flash the ECU if you are concerned about maintaining your warranty.

No they cant, the dealer cant change anything in the calibration at all for tire sizes. GM hasnt allowed this since around 2012 or 2013. All the dealer can do is flash the ECM with the correct calibration that was assigned to that VIN when the car was built.

The only way to correct for tire size is to either use the Hypertech tire size device or have someone change it using HP Tuners or EFILive. Either way that would cost around $200 at a minimum for the tuning credits to be able to do it.

Retro69 · 10-25-2018, 09:04 AM

Quote:

Originally Posted by itsadryheat79

I ran those BFGs Comp2/AS on my 12 ZL1 really like them especially for the price you cant beat them. I did not drive in snow but they are like 1/2 the price and did great for daily type driving in colder wet driving conditions.

I ran them year-round on my 2011 SS so I could save the RE71Rs for the track and autocross. I had no complaints about running them on the street.

Retro69 · 10-25-2018, 09:06 AM

Quote:

Originally Posted by TJay74

No they cant, the dealer cant change anything in the calibration at all for tire sizes. GM hasnt allowed this since around 2012 or 2013. All the dealer can do is flash the ECM with the correct calibration that was assigned to that VIN when the car was built.

The only way to correct for tire size is to either use the Hypertech tire size device or have someone change it using HP Tuners or EFILive. Either way that would cost around $200 at a minimum for the tuning credits to be able to do it.

Yeah I have an HP Tuners but would have to buy credits for it. Its just really hard to compromise the power train warranty where Chevrolet will honor it when tracking the car.

KingLT1 · 10-25-2018, 10:08 AM

Quote:

Originally Posted by Retro69

Well that is an option for sure but they are over $1,000 more expensive. Yikes!

$1,000 or no Warranty? Which is more important?

By law they can not void your warranty without proving the tuning caused a failure(magnuson moss), but some dealers may try too and you will end up paying lawyer fees in order to fight it if they choose to deny your warranty claim. It's up to you to decide if a set of cheaper tires is worth all that. #Firstworldproblems

TJay74 · 10-26-2018, 08:10 AM

Quote:

Originally Posted by KingLT1

$1,000 or no Warranty? Which is more important?

By law they can not void your warranty without proving the tuning caused a failure(magnuson moss), but some dealers may try too and you will end up paying lawyer fees in order to fight it if they choose to deny your warranty claim. It's up to you to decide if a set of cheaper tires is worth all that. #Firstworldproblems

I hate to tell you, when it comes to calibration changes the manufacture most certainly can void or blacklist the powertrain warranty. Audi, VW, Porsche, BMW, and Mercedes do it in the USA all the time.

The MMA does not provide protection when you mess around with the computer calibrations, that was argued years ago by the manufactures when the EPA requested they lock the calibrations down.

The MMA only protects you for when you change out parts on the vehicles that are not OEM, IE you use a Fram oil filter instead of a AC Delco. You use Pennzoil instead of Mobile, you run Continental tires instead of Goodyear. Using a Orielly alternator and the engine blows up, they would have to prove the aftermarket alternator caused the engine to blow up.

You take you Audi into the dealership for an oil change and while it is there the dealership is required by Audi to plug into it and check for any updates, while they do that the Audi mothership checks the computer calibrations. If they show to be modified Audi then flags the car with a "TD1" flag in their system.

At that point they will not warranty the powertrain any further going forward. I have personally seen it done and know people who have cars that have been flagged.

KingLT1 · 10-26-2018, 08:47 AM

Yea I have heard that too but I have also seen others state that tuning falls under the MMA. I do know there are dealerships out there that are mod friendly. Either way, The point was... is $1000.00 worth potentially voiding a warranty? I would say if the OP is here asking the question he should just buy the correct tires. lol

10-22-2018, 07:15 PM	#1
Retro69 Drives: 2018 Camaro ZL1 Join Date: Jun 2011 Location: Morgan, UT Posts: 1,359	Reflash ECM for Speedometer Recal vs Power Train Warranty??? I’m pretty sure I know the answer to this one but gotta ask anyway. I want to buy some BFG Comp2 A/S for driving in the cold, wet months but they only come in 35 profile. My speedometer would be off 3-4 mph which would really bug me. If I have the ECM reprogramed to adjust the tire size on my 2018 ZL1 do I risk voiding my power train warranty? Sent from my iPhone using Tapatalk __________________

10-22-2018, 10:08 PM	#2
nighttowl Sarcasm loading -------- Drives: 2018 ZL1 1LE Join Date: Dec 2011 Location: TX Posts: 1,805 View My Garage	They can do this at the dealership. I would definately not re-flash the ECU if you are concerned about maintaining your warranty. __________________ "The salesman actually told me to stop getting it sideways during the test drive" 2018 MBM ZL1 1LE - Stock 2014 CRT ZL1 574 rwhp, 537 rwtq - SOLD 2010 IBM SS Camaro VVT L99 w/ TR6060 swap, 489 rwhp, 444 rwtq - SOLD

10-22-2018, 10:10 PM	#3
Camaro_QC Drives: 08 Tiburon GS, 2018 Camaro 2.0T Join Date: Sep 2017 Location: Québec Posts: 1,657	But then you would have to have it reprogrammed after the cold months... All that every year. Maybe not worth it? __________________ 2018 Camaro LS \| 6 spd \| 2.0L turbo \| Nightfall Grey \| RS package \| Technology Package. --------------------- Order WDGHKX 1100 - 5/08/2018 \| 3800 - 6/18/2018 2000 - 5/09/2018 \| 4200 - 6/21/2018 3000 - 5/28/2018 \| 5000 - 6/27/2018 6000 - 6/29/2018

10-22-2018, 11:02 PM	#6
Retro69 Drives: 2018 Camaro ZL1 Join Date: Jun 2011 Location: Morgan, UT Posts: 1,359	Hrm... looks like a 305/35R19 is pretty darn close in size to the 305/30R20. It'll take a one-time wheel purchase but that might be a better solution. __________________

10-26-2018, 08:47 AM	#14
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,793	Yea I have heard that too but I have also seen others state that tuning falls under the MMA. I do know there are dealerships out there that are mod friendly. Either way, The point was... is $1000.00 worth potentially voiding a warranty? I would say if the OP is here asking the question he should just buy the correct tires. lol __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

10-22-2018, 10:21 PM	#4
Inspector 17 I love crepes Drives: 2017 ZL1 NGM A10 Join Date: Oct 2008 Location: Maryland Posts: 4,955 View My Garage	Why not just run the Pirelli Winter SottoZero 3? They come in the OEM sizes.

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