blnewt

iTrader: (13)

Hopefully that's mainly city driving, that would be sad for a lot of hwy cruising. I get about 19-20 city but 28-29 hwy, and that's w/ heavier 20" rims/tires.

I too have a few trans issues, none related to going up through the gears (in fact I find the upshifting in the 7at to be very good and right where the rpms should be for performance driving). Coasting from 30 mph toward a stoplight or trafffic does tend to be a bit clunky. I noticed this much more as we broke the car in. After 7k miles it doesn't seem nearly as noticeable, but still tends to "overhunt" when slowing from 30.

I wouldn't go so far as calling it unrefined, but one requiring a subtle tweak or two.

TinsleyC

I've seen my G do a funny shift quite a few times. I had the flash applied and it helped considerably. Still, occasionally I've seen it over-rev the engine by letting off the gas just before a shift point, I think it's 4th to 5th, or thereabouts - if I back off the throttle a bit from a moderate acceleration, just before the shift, it will pop out of gear and rev up about 500 RPM's higher, then the RPM's drop as it pops into the next gear.

I described all this to the dealer and they test drove it - "can't repeat the problem - all is good".

There are quirky things; like it running at 2,000 RPM at 30 MPH, but it drops to 1,500 at about 33 MPH with a gear change. And I agree the difference between 6th and 7th should be more... the engine seems to run too high of an RPM when at highway speeds in 7th.

Nontheless, I love the G and enjoy driving it any chance I get. 30+ MPG on the highway, and yes it will go 120 MPH with little effort.

ozzypriest

iTrader: (2)

Shoot, it will go 130-140 with just a little more effort. Note that these speeds were all attained on highways in [south africa]. I would never break the law on a US highway.

uhmeebuh

First time caller, long time listener

I jsut picked up my 2010 G37 and I'm having the same problem - the shifting is erratic and not very smooth. I notice it most when sitting in stop and go traffic as the tranny hunts for gears with my varying throttle application.

It does better in more open driving but it needs to be a bit "smarter" with the shift logic vs throttle positioning. And, yes, I know it's much more complex than that.

I bought my car on Sunday (2 days ago) so there's a fair chance they didn't do the TSB on the tranny (or any other TSB for that matter) as service was closed. Will be back on Sat to see if the dealer can do anything...

TinsleyC

Well, of course not.

CHIBSG37XS

I talked to the service manager and he said that if I wanted to do the reflash, the car will be less "aggressive" and shift earlier than without the reflash. He also said that if I get it done, there is no going back. I have not had rough downshifting ever since I posted this thread, but if it happens again, I am going to get the reflash.

blnewt

iTrader: (13)

The 2010s already have the most current trans software. Since you've only had the car 2 days (congrats on the new G BTW) your tranny response should improve as it keys in on your driving tendencies.


Heard the reflash also decreases your gas mileage. At first I thought the trans was a bit chaotic, but nothing about it really bothers me anymore. I think I'll just let it be unless they come up w/ an even better TSB w/ no mpg compromises.

uhmeebuh

Ahh - good to know! I talked with the service manager today and he couldn't identify whether my car had the TSB applied which seemed a bit strange. I made an appt for Sat but I'll just cancel it based on your info (which is MUCH more helpful than the dealer has been so far).

Thanks!

Q8y_drifter

exactly.
if you drive aggressively for a while and then go back to driving normally again, the transmission will need time to relearn your recent driving style. Just drive around for a short while and it will become better.

328HP

Thats interesting, I have a 2010 and its been silky smooth. My RPM are always less than 2500 at H/way speeds even if I go 10-15mph over the speed limit. Since I am in the breaking in period I have been trying to get the engine to rev outside the 2-2500RPM zone at H/Way speeds and the only way to do it legally without doing +20mph over the speed limit is to throw it in DS mode, where 3000RPM @ 60mph is common.

blindman8858

If you just bought the car you are still in your break in period. I bought my 09 g37s coupe 7AT and in the beginning the shifts were jerky. I have nearly 1600 miles on the car and things are a lot smoother now. Let your car break in and then report back. The ecu is also going through a learning phase to pick up on your driving habits.

Nevertheless, even though things are smoother for me, I am going to take it in to the dealer when my first service is due and assure I have the most up to date firmware.

PeterUbers

iTrader: (1)

I have gotten so used to the 7at and truly have grown to love it as well -- the first few weeks bugged me .. but it has learned my driving style and I much prefer it to my '08 G 5AT...

ray combs

Bingo, we have the same problem. Shortly after we purchased our G37 sedan, about 3000 on the odometer, the car began to chug at about 2500 rpms. We pulled over, and at the suggestion of my son in law, we turned off the ignition, waited about a minute, and started it again. It drove fine but we took it to two Infiniti dealerships who ran diagnostics and said they could find nothing wrong. They gave us the same response you received, that the gas was bad or the car had not yet become used to our driving. Well, it just happened again at 13,000 miles. We don't know what to do as we get no sympathy from the dealerships. Its almost as if they think we are making it up. We do love the car, but this is getting scary.

ray combs

I don't know if I'm doing this right but here it is again.

Bingo, we have the same problem. Shortly after we purchased our G37 sedan, about 3000 on the odometer, the car began to chug at about 2500 rpms. We pulled over, and at the suggestion of my son in law, we turned off the ignition, waited about a minute, and started it again. It drove fine but we took it to two Infiniti dealerships who ran diagnostics and said they could find nothing wrong. They gave us the same response you received, that the gas was bad or the car had not yet become used to our driving. Well, it just happened again at 13,000 miles. We don't know what to do as we get no sympathy from the dealerships. Its almost as if they think we are making it up. We do love the car, but this is getting scary.

Canadian144

Similar story here... 03 Mercedes Benz C320 --> 2007 G35x --> 2009 G37x coupe.

The 07 G was far superior to the C320 in performance as well as comfort and luxury. We paid $74,000 for the C320 back in 03 (Canadian $$ prices), and when it had 50k km on it in 07 the best trade in we could get from the Benz dealer was $16,000 (got it up from $14,000!). Infiniti offered us $23,000 and we paid $54,000 (before trade) for a fully loaded G instead of a Mercedes E350 4matic sport for $90,000. We had only 1 problem with the G35x, the sunroof gears broke or something, the WHOLE sunroof was replaced under warranty.... the Benz on the other hand.... catalytic converter, electronic this or that, etc etc.