ITB12-027 7AT Fix
06-25-2012, 09:21 PM
#17
Registered User
Just had this done on my 09 G37S Sedan. I don't think it is as "Night and Day" of a difference as some here claim, but I have noticed a few things:
1. Shift lag significantly reduced. It's still there somewhat because, at the end of the day, the 7AT is still an auto trans. However, it is much better. Gone are the days of applying the pedal 2 seconds in advance of when you want to pass somebody. And also gone is the bogging in a high gear when you floor it.
2. The transmission no longer downshifts aggressively at all during sudden braking. I had mixed feelings about that "feature", because it sounded cool but it also jerked the car forward when applying the brakes which scared people sometimes. Overall much smoother with that behavior's removal.
3. The transmission seems to need less pedal application and time to make its decisions, which overall makes the drive feel more crisp and responsive compared to how it used to be.
4. Drive Sport got neutered :/ It isn't as crazy aggressive as it used to be, but it's still sportier.
Overall, the benefits far outweigh the positives. Get this TSB done!
1. Shift lag significantly reduced. It's still there somewhat because, at the end of the day, the 7AT is still an auto trans. However, it is much better. Gone are the days of applying the pedal 2 seconds in advance of when you want to pass somebody. And also gone is the bogging in a high gear when you floor it.
2. The transmission no longer downshifts aggressively at all during sudden braking. I had mixed feelings about that "feature", because it sounded cool but it also jerked the car forward when applying the brakes which scared people sometimes. Overall much smoother with that behavior's removal.
3. The transmission seems to need less pedal application and time to make its decisions, which overall makes the drive feel more crisp and responsive compared to how it used to be.
4. Drive Sport got neutered :/ It isn't as crazy aggressive as it used to be, but it's still sportier.
Overall, the benefits far outweigh the positives. Get this TSB done!
06-25-2012, 09:45 PM
#18
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does this new TSB correct the "flare" in the transmission? where sometimes the rpm will jump up around 250-500 rpm between shifts (feels like a slipping tranny or locking and unlocking of the torque converter to early). mostly does this when you drive the car a bit then park for a little then drive again. It doesn't happen all the time, but it sure is annoying when it does!
06-26-2012, 10:56 AM
#19
does this new TSB correct the "flare" in the transmission? where sometimes the rpm will jump up around 250-500 rpm between shifts (feels like a slipping tranny or locking and unlocking of the torque converter to early). mostly does this when you drive the car a bit then park for a little then drive again. It doesn't happen all the time, but it sure is annoying when it does!
06-27-2012, 08:55 AM
#21
Registered User
Just had this done on my 09 G37S Sedan. I don't think it is as "Night and Day" of a difference as some here claim, but I have noticed a few things:
1. Shift lag significantly reduced. It's still there somewhat because, at the end of the day, the 7AT is still an auto trans. However, it is much better. Gone are the days of applying the pedal 2 seconds in advance of when you want to pass somebody. And also gone is the bogging in a high gear when you floor it.
2. The transmission no longer downshifts aggressively at all during sudden braking. I had mixed feelings about that "feature", because it sounded cool but it also jerked the car forward when applying the brakes which scared people sometimes. Overall much smoother with that behavior's removal.
3. The transmission seems to need less pedal application and time to make its decisions, which overall makes the drive feel more crisp and responsive compared to how it used to be.
4. Drive Sport got neutered :/ It isn't as crazy aggressive as it used to be, but it's still sportier.
Overall, the benefits far outweigh the positives. Get this TSB done!
1. Shift lag significantly reduced. It's still there somewhat because, at the end of the day, the 7AT is still an auto trans. However, it is much better. Gone are the days of applying the pedal 2 seconds in advance of when you want to pass somebody. And also gone is the bogging in a high gear when you floor it.
2. The transmission no longer downshifts aggressively at all during sudden braking. I had mixed feelings about that "feature", because it sounded cool but it also jerked the car forward when applying the brakes which scared people sometimes. Overall much smoother with that behavior's removal.
3. The transmission seems to need less pedal application and time to make its decisions, which overall makes the drive feel more crisp and responsive compared to how it used to be.
4. Drive Sport got neutered :/ It isn't as crazy aggressive as it used to be, but it's still sportier.
Overall, the benefits far outweigh the positives. Get this TSB done!
06-27-2012, 02:48 PM
#23
Registered User
2. The transmission no longer downshifts aggressively at all during sudden braking. I had mixed feelings about that "feature", because it sounded cool but it also jerked the car forward when applying the brakes which scared people sometimes. Overall much smoother with that behavior's removal.
I agree it surprises people, but it is a great safety feature in my opinion.
06-27-2012, 11:31 PM
#24
Registered User
I would always feel the car jerk forward whenever this happened - not sure why.
06-27-2012, 11:56 PM
#25
Registered User
Are you sure it isn't just an "optical illusion" for the ears that because the engine is speeding up you think the car is too? You realize that the brakes will stop the car even under wide open throttle? I presume there is no throttle application when this jerk happens?
06-28-2012, 12:37 AM
#26
Registered User
So you are applying progressively more brakes and the tranny is downshifting (with rev matching) and instead of slowing at an increasing rate (due to combo of brake pedal and engine braking) the car somehow overcomes the force of the brakes and jerks forward?
Are you sure it isn't just an "optical illusion" for the ears that because the engine is speeding up you think the car is too? You realize that the brakes will stop the car even under wide open throttle? I presume there is no throttle application when this jerk happens?
Are you sure it isn't just an "optical illusion" for the ears that because the engine is speeding up you think the car is too? You realize that the brakes will stop the car even under wide open throttle? I presume there is no throttle application when this jerk happens?
06-28-2012, 10:19 AM
#27
Registered User
06-29-2012, 02:12 PM
#30
Registered User
So you are applying progressively more brakes and the tranny is downshifting (with rev matching) and instead of slowing at an increasing rate (due to combo of brake pedal and engine braking) the car somehow overcomes the force of the brakes and jerks forward?
Are you sure it isn't just an "optical illusion" for the ears that because the engine is speeding up you think the car is too? You realize that the brakes will stop the car even under wide open throttle? I presume there is no throttle application when this jerk happens?
Are you sure it isn't just an "optical illusion" for the ears that because the engine is speeding up you think the car is too? You realize that the brakes will stop the car even under wide open throttle? I presume there is no throttle application when this jerk happens?