Hi,

I've had my 2008 G35x about a month. One thing I'm still having trouble getting used to is accelerating. As much as I enjoy leaving my driveway at mach 1, I'm trying to determine if the problem is me or the car.

I find when I gradually press on the gas, the car doesn't respond initially so I apply more pressure and then the car REALLY responds. Also, sometimes when braking the car almost feels like it loses power for a second and slows more than expected.

I know I'm doing a terrible job of describing it, but would love to hear your opinions as to whether I should talk to dealer service about it.

Thanks!
Rick

 

The harsh acceleration is a known issue (Issue to some not others ) There is a TSB for it. The dealer can reprogram your tranny to relieve the harsh acceleration

the Braking is probably due to the 'rev Matching" that I read our cars have///not sure though

 

Our cars will downshift on hard enough braking to help slow the car faster, not sure if that's what you're referring to or not, but if so then it is normal. I think the acceleration is probably just you getting used to it.

 

Also, if you have ICC (Intelligent Cruise Control) we have "Preview Braking" which will charge up the braking system and brake harder when it see's that you are approaching an object at a fast rate of speed

 

It does take some time to get use to but our cars is very sensitive.

 

Totally know what you are talking about. I drove a Land Rover LR3 for some time and when I first got the G, I was pulling out of parking spaces at mach 1 haha.

I think it's a little of both; partly you getting used to it, and partly the car. You definitely will get used to it and as you get more and more comfortable with the car you'll know how to accelerate without even thinking of it. On the other hand, though, it sounds like it could be the car. I know the transmission - over time - learns your driving habits and can modify the sensitivity based on your habits. Ironically, I just had the opposite problem. Where I live, I go very slowly and have many stop signs, corners and such so I drive very cautiously and slowly and because of that the transmission adapted and lowered the throttle response/sensitivity. I really noticed it when I was out and wanted to have some fun and couldn't accelerate like I wanted to. I had to reset it by disconnecting the battery; sensitive as hell again haha.

 

Also note that our gas pedal is different from most other cars out there. It is mounted to the floor like most German cars. To gain more control while accelerating, I had to relearn my foot position. With a traditional upsidedown pedal you simply touch the bottom tip of the pedal for ease of use. Ours are just the opposite where you should have your heel at or close to the bottom of the pedal. Let the ankle do the pressing and you'll notice how much more travel there really is.
The TSB has been performed on my car before I bought it and I get absolutely no throttle response until about 25% into pedal travel. Once there. the power comes on smooth. My foot has gotten used to knowing where the exact point in the pedal travel the throttle will begin coming on kind of like knowing where the clutch begins to engage.
Hope this helps.

 

I did not like the throttle pedal sensitivity at first but the more I drove, the more used to it that I became. As mentioned, there is a TSB to rectify this "problem", however it is *not* reversible. Once it's done, it's done, so make sure that you are surely sure before you have it done.

Mike

 

Thanks All!

Can someone post a link to the particular TSB I should reference and possibly where I can read more about it?

Should I try disconnecting the battery first and see if the "learning" is reset? (I think someone suggested that)

 

Search here or google "G35 throttle sensitivity" or "ITB08-017".

You can read the actual service bulletin at Infinitihelp.com

 

Here's a link to the page with the tsb, just register for infinitihelp.com and you should be able to download it. ITB08-017a

I would try disconnecting the battery to reset the ecu first, just remember that you'll have to reset your radio presets and auto up/down windows.

 

I saw this TSB was for a 2007, mine is a 2008. Would it still be applicable?

I also found this procedure for resetting the ECU-> http://answers.yahoo.com/question/in...4180022AAzVICS

I'll have to give this a shot.

I wonder if there are Infiniti Easter Eggs waiting to be found....hmm...but I digress

 

I would caution to seriously consider this bulletin application. I speak from experience as when I first got my G I also was annoyed by this behavior. I found this bulletin and had it applied it fixed that problem but produced a negative result also. I’m sure if you research this bulletin thoroughly even on this site you’ll find the negative comments I speak of. After the upgrade like I said it did fix that problem but now the car seemed almost hesitant to go. It seemed to lose let’s say that “Sparkle” I always loved about it. Not being able to positively put my finger on it made it even more frustrating. I even asked the dealer if he could revert things back. I’d rather live with the touchy gas pedal then accept things as they were. He said no couldn’t be “undone”. I took a drive on another G with dealer and showed him the difference. Nothing could be done. So I said to myself well it’s still a very enjoyable car I’ll see if down the road there’s an answer. Had to wait till March of 2011 to restore my beloved G back to its prime performance state in the form of bulletin numbered 1TB11-018. Bottom line considers this sensitive gas pedal well. In my opinion leave it alone and consider it “The Nature of the Beast”.

 

So, to be clear, you had the original TSB performed (#17), didn't like the result (as many others have reported here too), and then had this other TSB (#18) performed to restore it back to original.

Is that right?

Is throttle response actually back to original now, or is it somewhere between original and the first overly-compensated TSB?

 

Not sure if we can say that the second bulletin was made to restore the system. It addressed a particular problem which one that was caused Ironically by the first in my case. I may be wrong but I think the later update incorporates the prior ones. I know the ECU version now ends with an "E" and it ended with a "D" prior to the update. The original was a "A" I've had some changes made to correct things like the ICC unit operation. To be perfectly honest the gas pedal problem is “slightly” better now. Or maybe I’m just getting used to it again because now it has that “snap” off the line that I really liked about the car. It was especially pronounced with the all wheel drive because it didn’t matter what the road conditions were. The damn thing just goes like it’s geared to the road and thankfully it’s like that again. Certainly not enough better to make up for the length of the time which the car wasn’t “as purchased”.