We have a '09. And (if I recall correctly) I had an early TSB reflash done somewhere within the first year. But I can't say that it did a single thing (assuming it was indeed even performed) for the car, because the shifting never improved.

So, I'd like to look into getting whatever is the newest fix done. Three questions:

1) Is the NEWEST flash: ITB12-027D

2) Is there any way to know what software version my car currently has?

3) Does the newest flash require a subsequent upgrade first? Kind of like a computer OS update???

Thanks!

 

Mine is 2011 G37, already applied ITB12-027 in the past, do i still needed the NEWEST flash: ITB12-027D?

Or what's goodie?

 

I put "ITB12-12d" in the "search this thread" box and came up with multiple hits. Although not a definitive answer but I did draw my own conclusion.

Start reading from post 1952 page 131.




More good reading from Tvpostsound
https://www.myg37.com/forums/tsb-tech...ml#post3537750


From infinitiexpert @ http://x.infinitihelp.com/forum/show...8.html?t=10458

 

I have an 09 sedan and gone through various update. Base on personal perference, I wish I never flash any of the update and live with the harsh shifting and rpm matching.

If you let go the gas pedal and you feel the engine braking. Good chance you didnt get the 075 update (I THINK). During you next oil change, see if you can get 2010/11 loaner to test for yourself.

 

I took Almattis advice and drove around exclusively in DS yesterday.

Now keep in mind it was a whopping 11 degrees out (cold air = better performance?) but the car was driving night and day compared to what it used to. In the middle of a turn if I gave it throttle the back end would cut loose and traction light would come on. Thats exactly how the car responded right after the new s/w, except then it was doing it in D and now its doing it in DS.

Dare I say, perhaps they have come close to getting it (mostly) right?

 

ATTA Boy, Chris. My prescription of driving in DS mode for a while then switching to D mode does seem to help. hat is the advice I received way back when in June 2010 after just taking delivery. The service advisor at the Dealership gave that advise then when I ahd returned the car in two days and said: "WTF" is this ???".

Anyway, after the 027 TSB reflash, I have found that the car does respond better after driving in DS mode for awhile (1/2 day or more) and then switching to D Mode. DS mode does seem to burn more gas, b/c you will find that if you switch to M mode while on the highway, you see 5 or 6 gear, not 7. so she's driving in a lower gear for the throttle response with a little less "gear hunting", and of course, Rev matching when you declerate. I find also, that there is less Rev Matching in DS mode with the G37X even before the application of 027. My 2007 G35X was a whole better in the driveability in D and DS modes....Hopefully, Infiniti will be able to "engineer" the 2007 felling and response back into the 2014 model. That's to be seen though. Note that the Trannies are JATCO made (for Nissan & Infiniti). There Rav reviews for the MB, BMW & Audi /VW multi- geared 7 or 8 ATs. Infiniti should be able to at least match or better that performance.

 

Can you please elaborate? The transmission, is it stands now in our '09, is rough, unrefined, jerky, slow to react, and totally uninspired. Are you saying that you preferred all that, to whatever the newest flash did for yours???

 

We have a new Audi with the 8AT. Let me tell you that it is in a COMPLETELY different league from the sad Infiniti. Obviously, there's more to it than just that (ECU programming, fuel mapping, etc.) but whatever the reasons, the Audi feels like a true performance vehicle, with stellar around town drive-ability. Just tap the throttle a hair, and the car responds. Silky-smooth up and down shifts. It makes me SO happy we bought a German car, and SO sad that Nissan can't deliver a good product.

A relative has a 2005 G35 sedan. How sad is it that it drives much better than our 2009? Pretty inexcusable, right? Sure, ours has more HP, and fancy brakes, etc. But who cares if the transmission feels like it was sourced out of a first-generation Hyundai?

 

This is my personal preference and experience... given the two evils (no update vs any version of the upate), I like how the car drove when I first got the car before all the update. Yes, there was a lag, the harsh shifting and rev matching but after you made it past the lag, I feel the car accelerated harder/faster than with update...been at least 3 yrs and memory not so good.

With the 075 update, lag was still there but harsh shifting was gone, rev matching was gone, basically the update smooth things out. But what was also gone was the harder/faster acceleration.

With 27a update, IMO not much improvement but the acceleration was marginally better...it felt more linear.

I was not happy with how the car drove so I tried hypertech.

see my hypertech post.
https://www.myg37.com/forums/g37-sed...tsb-027-a.html

Was so happy with the lastest hypertech update and I thought if that was good, I cant wait for the next update. I was checking every week and finally they released another update. Sadly, the latest tune took a step or 2 back (u cant go back to old revision). I contacted hypertech and told them about my experience. They said they'll pass it on to their engineers...am patiently waiting for another update. Is hypertech or uprev the answer? Everyone has different preference and priority but I am looking into uprev .

I dont know what version of the update you have. Like I said, get a loaner with the latest update so you can decide for yourselves, cause you cant flash back to older update. Good luck

P.S Will give Almatti driving in DS mode a try and reset ecu prior.

Here is one of many post out there on how to reset ECU. Just be persistent. I broke down the procedure so I can reminder it.. start, wait 3, stump 5 before 5, wait 7, hold 10, wait 10, hold 10.
Easy ECU Reset Procedures - 6MT.net Infiniti G35/G37/GTR Forums

 

Its amazing, to me, how right the Germans can get something like an engine and transmission, yet everyone I know with any German car (BMW, VW/Audi, etc) has complained at least TWICE about the work that needs to be done JUST AFTER the warranty expires, along with a myriad of electrical issues both in and out of warranty.

Im sure I would enjoy driving one, but writing an >$1000.00 check for an alternator replacement would pretty much taint most of that enjoyment.

I suppose if you lease, no big deal. But I dont (maybe I should?) so I buy what looks reliable to me. Regardless of their sales, Nissan's status as an automaker, etc, Infiniti has always been reliable for me. Sure I replaced a set of calipers on my old i30, but it sure beats the seat heater turning on to full blast and not shutting off (my brother-in-law has a Jetta that this happened on)

 

epic thread IMTASE

 

Sneakers,

What has been your experience with the notable abrupt/rough downshift when coming to a stop?

 

I have an 09 g37x sedan, the dealer did it to my car and now it feels more responsive.

 

First take my opinion with a grain of salt. We might be comparing an orange with a tangerine

I have a 09 awd sedan. For me, with 075 & 027 update, when I slowly come to a stop whether from applying brakes or coasting, I dont feel the abrupt/rough shifting. When I said "rev matching gone", thats probably not an accurate statement to describe what I am experiencing. I dont know if rev matching is gone or not. It could be that the update change how the gear selection is made to match a given speed to allow for a smoother transition. I dont know.

In DS mode(manual mode) if I let go of the gas pedal and coast, I feel the engine braking and when it auto downshift, I feel a little jerk...kinda like when I said "rev matching gone".

Secondly, everyone has a different opinion about the update. Some love the update and some not so much. From my observation, I think it depends if you had the earlier 09 model before the update when the car drove like how infiniti originally designed it (good or bad) vs those who already had 075 update from the factory vs those with the same 075 update but different model year vs your driving style/when adaptive kicks in vs whatever permutation you like. You'll get a different feedback.

For me, with the updates it is smoother than before but not as aggressive. With the 027 update, infiniti is heading toward the right direction. But I am looking into alternative solution while infiniti sort things out. At the end of the day, even with the quirks, I still love driving her and taking on those turns...just need to practice when to gas and shift or is it shift then gas lol. Good Luck

 

Great synopsis man Thank you!