mittens

So looking at a 2014 now, and the only downfall I see is the rev matching not as good.

So after some searching it seams there is a update even for 2015 cars with the newer calibrations. Posted below.

My question is can you do that update on a 2014 car and it rev match like a 2015+ or if that not possible? I know getting a dealer to do it may be a problem.. but my question is will it work if you have a friend that's a GM tech with access to the right stuff, would this work?

Has anyone done it?
has anyone talked a dealer into doing it?

FOR info.

PIP5260B: Active Rev Matching Inoperative P0731
Component: ENGINE, POWER TRAIN
SUMMARY:
Some customers may comment that the Active Rev Matching feature is inoperative and upon further inspection technician may find a P0731 stored in the engine control module.
Recommendation/Instructions
If you should encounter this condition on a 2015 equipped with a MEL RPO transmission update the calibration in the ECM as there was software released to correct this condition.

Kent1999

The process noted is that rev match is inop.

My rev match on my 2014 seems to work well enough.

What “problem” are you trying to solve, exactly?

Foosh

What makes you think that ARM is better on later models? As Kent said, the service bulletin pertains to ARM inop.

I don't see how it could possibly work better on my '14, and with smooth clutch technique, there's zero chassis upset, which is a clear indication that the match is perfect.

I do know a lot of people use an improper technique with ARM enabled by leaving their foot resting on the throttle which confuses the system. I saw that on my first test drive, but figured it out quickly. As clearly specified in the owner's manual in the ARM section, one's foot needs to be completely OFF the throttle for ARM to work properly.

davidtcpa

No issues with mine either.

mittens

every thread talks about the 2015+ has new calibrations that make it more accurate and a lot faster reacting vs the 2014.

2K14C7

My 14 Rev Match works perfectly.

Foosh

Huh? I have no clue what you're talking about, and I've never seen a thread that discussed this until now.

Once I again I'm asking what is your basis for comparison? Sounds to me like you test drove a 2014, and didn't use the proper technique. I don't know where you heard later MYs were somehow better.

"Faster reacting" is not what one wants. What one wants is a rev match that occurs precisely at the right time, which is what we already have in the 2014.

mittens

I don't even have a C7, I am in process of buying one. SO no I am not talking about me or I did it wrong.

There are many threads on this fourm, and the STING.. forum talking about in 2015 it was updated and was notably better. also if you look at threads where people comparing years its talked about as well.

I have posted in 2 other threads and started this one if you want to link to 2 others. but search function will bring it up as well. or google it. where people talk about the updated version.

Foosh

Then I have to disagree with whatever you've seen or heard here or elsewhere, as others in this thread have pointed out. It wouldn't be the first time someone has passed on bad info in a car forum.

Since my experience is that it is perfect in my 2014, I don't what there would be to improve upon. As I said above, anyone having trouble with ARM is keeping their foot on the throttle contrary to proper operating procedure.

robert miller

OP here lets says this about GM per say, if it is not broken don't let them play with it. Sometimes it comes up with something else wrong are not working as good as it did before. Mine is very good on my 2014... Robert

thrilled

My rev match don’t Work good on my 14. I have heard many others say the same thing.
I believe that’s why they came out with the fix for the 15
I just do the old school technique.It works for me.

mdiiulio

Well, to answer the original question, and without getting into too much he said/she said crap... No, GM will not upload 2015+ Rev match calibration onto a 2014. Does that mean you won't find a dealer who will do it? I don't know, but it'd be an uphill battle for sure. To this point I haven't heard of any on the forum that had success with that.

Also, your OP seems to point at a fix for a failing rev match system. The 2015 software update listed may not be a full calibration, but more of a patch. So you may be looking at two different things, i.e. the 2015 patch may not be compatible with the 2014 software. Again, hard to know either way without someone from a dealership service background chiming in.

themonk

My '14 RM works fine, I can't say how it compares to '15+ but I'm happy with it so if it ain't broke don't fix it.

JerryU

My September 2013 built Z51 operated fine. No different than my current Grand Sport. I use Rev Match 95% of the time.

I read that bulletin the OP posted as a possible error on some 2015 cars.

Foosh

Are you sure you're not subconsciously still doing the "old school" thing with ARM on? That would explain why it doesn't "work good." The foot should be completely off AKA not touching the throttle. It then works beautifully.

mittens

well that is good to hear others saying its the same/fine.

hopefully so deposit was just made on a 2014. But I have access to dealer tech for random stuff so that's why I wsa wondering is POSSIBLE, not will they do it for you... but COULD they.

Maybe its not a issue.. normally 1-2 threads coul dbe false, 5-10 and different forums made me think it was more likely true that the 2015+ worked better. not that the 2014 was broken

F4 Phantom

Sorry, I couldn't resist.

JerryU

Since you are just getting the car, these are two things you can’t do with rev mAtch you may, like me had been doing. In my C6, for example if downshifting two gears as when going around a corner in town driving at lower rpm’s with the clutched depressed I would go through the skipped gear. Spools up the gear cluster. Can’t do that with rev match confuses the computer as to which gear you want!r

Some folks complained about over revving. Ran a test and was able to duplicate the complaint. Went from 5th to 3rd as when turning a corner. But instead of putting the shift level into 3rd, I pushed the lever into the 1st/2nd gate still in neural. The Hall sensors interpreted that as I was going into 2nd even though I did not put the lever into 2nd. Must put the gear lever only into the rear you want and where you will engage the clutch. Let the syncros spool up the gear clusters, there are triple syncros on most gears!

IMO rev match is the best thing since synchromesh for a standard trans! I’ve only had standard ***** in th DD for 55+ years of driving. Quite good at heal-toe at higher rpms when driving in anger! However It’s harder to modulate the throttle say from 1500 rpm to 2500 rpm. With 7 speeds you’ll find skipping gears very useful. Rev Match does it perfectly every time.

mittens

For reference, here an article even states it was updated in 2015. for all you non believers.

http://gmauthority.com/blog/2014/08/...e-first-drive/

Kent1999

Didn’t see the one-liner in there about the manual trans at first.

Since they are completely lacking in specifics, would assume that it’s the same small tweaks that they do every year, and not some new capability.

I’ve driven both a 2014 and a 2015 — RM seemed the exact same to me.

If you’re passing up good 2014’s for this tweak, you’re only hurting yourself. Have at it.