accelerating hard and shift shock, is it unavoidable?

[BlahBlahYouToo]

Well SMG is a BMW invention, the M- double clutch DCT's are made by Getrag I believe.

Their differences are substantial enough that you can't really equate a SMG to a DCT. The DCT is also quite a bit superior.

please stop trying to sound like you know anything about cars.
we're not talking about faux manuals here.

 

[Demon-Xanth]

With care, I can shift smoothly and avoid the shock, and I tend to do it while hauling stuff. You just need to be easy with your movements. But often, I like to make the rear end move.

...I do need new synchros though. My transmission never did like being shifted fast much.

 

[amdhunter]

This is only on down-shifts AFAIK.

It also works to a point on the upshifts. I would probably find this annoying as hell though.

I could imagine someone learning to drive manual on a 370z and then going to a regular manual car -- they'd probably go insane or have the worst time shifting.

 

[daw123]

???? lol.

Shifting fast at redline at WOT is going to be a jolting experience in any car. I just rode in an '09 STI last weekend, with the excellent 6-speed, and the 1-2 and 2-3 shifts were like sledgehammers.

I get the same if I'm accelerating hard in my WRX.

 

[madoka]

when WOT to redline and then upshifting, you're met with a nice jolt when transitioning gears.
seems like it doesn't matter what car you're driving, what wheels are propelling the car. every car i've driven exhibits this, but i'll admit i haven't driven that many cars.

do these go hand in hand?

Not necessarily.

I do not have this problem at all in my IS F and only mildly in my PDK Cayman S. The IS F shifts so fast and smooth that I'm surprised how fast it can get to 8th gear. I've noticed the Cayman is not as smooth, especially at lower speeds. At WOT the Cayman is also wickedly fast in shifting and is hardly noticable, though I've just gotten past the 2000 mile break-in period so I haven't played around with launch control yet.

 

[EightySix Four]

Not necessarily.

I do not have this problem at all in my IS F and only mildly in my PDK Cayman S. The IS F shifts so fast and smooth that I'm surprised how fast it can get to 8th gear. I've noticed the Cayman is not as smooth, especially at lower speeds. At WOT the Cayman is also wickedly fast in shifting and is hardly noticable, though I've just gotten past the 2000 mile break-in period so I haven't played around with launch control yet.

IS-F is a slushbox, a cayman s in sports mode does jolt between shifts at WOT.

 

[Arkaign]

IS-F is a slushbox, a cayman s in sports mode does jolt between shifts at WOT.

Yep, and that doesn't mean it's broken, it's just more tuned for performance

 

[ayabe]

Yep, and that doesn't mean it's broken, it's just more tuned for performance

No it means it's a shit transmission, that's what I got out of this thread.

 

[EightySix Four]

No it means it's a shit transmission, that's what I got out of this thread.

A transmission which causes a jerk on WOT upshifts is broken?

That's a negative. That's exactly how it should be.

 

[ayabe]

A transmission which causes a jerk on WOT upshifts is broken?

That's a negative. That's exactly how it should be.

I was being.....oh nevermind....happy fools, fools.

 

[Arkaign]

A transmission which causes a jerk on WOT upshifts is broken?

That's a negative. That's exactly how it should be.

I think he's being sarcastic due to MjinZ's rather hilarious first post in this thread

Ayabe knows better

 

[EightySix Four]

I think he's being sarcastic due to MjinZ's rather hilarious first post in this thread

Ayabe knows better

Meh, there's so many dumb asses lately I don't know when people are being real or not

 

[madoka]

IS-F is a slushbox, a cayman s in sports mode does jolt between shifts at WOT.

1. OP did not specify transmission

2. Just went out with an unsuspecting passenger for lunch in the Cayman S. I went WOT and when I got to 7th gear, I asked him if he noticed a single shift. He did not. Then I turned on Sport and tried it for 3-4 more runs. You can't hardly tell when the shifts happen, and certainly there is no shift shock as asked by the OP.

 

[EightySix Four]

1. OP did not specify transmission

It is quite fucking obvious we're not talking about slushboxes, the torque converter would take the shock away

2. Just went out with an unsuspecting passenger for lunch in the Cayman S. I went WOT and when I got to 7th gear, I asked him if he noticed a single shift. He did not. Then I turned on Sport and tried it for 3-4 more runs. You can't hardly tell when the shifts happen, and certainly there is no shift shock as asked by the OP.

I have twice test driven Cayman's, wasn't a fan due to the high cost for the relative lack of power, and in both I could easily tell when there was a shift, and in the 1-2 you could lightly chirp the tires.

 

[Arkaign]

1. OP did not specify transmission

2. Just went out with an unsuspecting passenger for lunch in the Cayman S. I went WOT and when I got to 7th gear, I asked him if he noticed a single shift. He did not. Then I turned on Sport and tried it for 3-4 more runs. You can't hardly tell when the shifts happen, and certainly there is no shift shock as asked by the OP.

Hmm, was it really in Sport+ mode? I rode along for a test of an 09 S w/PDK, and under WOT it was smoother than some but still had that classic jackhammer feel (which, by the way, tells you that the thing is grabbing the gear and not slipping at all under full power).

 

[vshah]

1. OP did not specify transmission

2. Just went out with an unsuspecting passenger for lunch in the Cayman S. I went WOT and when I got to 7th gear, I asked him if he noticed a single shift. He did not. Then I turned on Sport and tried it for 3-4 more runs. You can't hardly tell when the shifts happen, and certainly there is no shift shock as asked by the OP.

you went WOT through 6 gears? how fast were you going??

 

[madoka]

Hmm, was it really in Sport+ mode? I rode along for a test of an 09 S w/PDK, and under WOT it was smoother than some but still had that classic jackhammer feel (which, by the way, tells you that the thing is grabbing the gear and not slipping at all under full power).

Did not try Sport+ as crazySOB297 only mentioned Sport.

 

[EightySix Four]

Did not try Sport+ as crazySOB297 only mentioned Sport.

 

[madoka]

It is quite fucking obvious we're not talking about slushboxes, the torque converter would take the shock away

I have twice test driven Cayman's, wasn't a fan due to the high cost for the relative lack of power, and in both I could easily tell when there was a shift, and in the 1-2 you could lightly chirp the tires.

1. Instead of reacting like a petulant child, learn to read. OP did not refer to any transmission type. I was simply answering his question.

2. Starting in 09, the Cayman S got a new transmission (PDK instead of tiptronic) and a more powerful engine. You don't state which you test drove, nor do you mention the options which could play a role in the way the car feels.

 

[madoka]

If you actually knew anything about the car, there are two sports modes: Sport and Sport+. Both change the way the car shifts. To quote from the manual (p.61):

SPORT - A sporty gear-changing map is enabled and the gear shifting times are shortened for the PDK transmission. A sporty driving style is recognized more quickly and the gear-changing speeds are adapted to driving performance.

SPORT PLUS - the PDK transmission changes to a shift program designed for driving on race circuits. 7th gear is not selected. The gear-changing performance is enhanced significantly again compared with Sport mode.

 

[EightySix Four]

1. Instead of reacting like a petulant child, learn to read. OP did not refer to any transmission type. I was simply answering his question.

2. Starting in 09, the Cayman S got a new transmission (PDK instead of tiptronic) and a more powerful engine. You don't state which you test drove, nor do you mention the options which could play a role in the way the car feels.

1. Or maybe you could have used a modicum of common sense and realize that none of our conversation applies to a transmission with a torque converter, since it is obvious the torque converter would remove the shock from the drivetrain catching up to the motor.

2. Once again, common sense... I would not have been talking about a car with a torque converter (tiptronic). So they must have been at least 2009's, both were S models with PDK.

If you actually knew anything about the car, there are two sports modes: Sport and Sport+. Both change the way the car shifts. To quote from the manual (p.61):

SPORT - A sporty gear-changing map is enabled and the gear shifting times are shortened for the PDK transmission. A sporty driving style is recognized more quickly and the gear-changing speeds are adapted to driving performance.

SPORT PLUS - the PDK transmission changes to a shift program designed for driving on race circuits. 7th gear is not selected. The gear-changing performance is enhanced significantly again compared with Sport mode.

My point was you're arguing stupid fucking pedantics instead of about the topic at hand. You can feel a shock when you shift in the fastest shift mode, I don't care if it's called Sport, Sport Plus, or OMFG THIS TRANS SHIFTS HARD.

You came in and said you could not in either of your cars. It is obvious why you could not accomplish this in the IS-F since it does not have a proper gear box, and you have quite obviously done everything in your power to try and avoid that it does happen in the Porsche.

 

[madoka]

1. Or maybe you could have used a modicum of common sense and realize that none of our conversation applies to a transmission with a torque converter, since it is obvious the torque converter would remove the shock from the drivetrain catching up to the motor.

2. Once again, common sense... I would not have been talking about a car with a torque converter (tiptronic). So they must have been at least 2009's, both were S models with PDK.



My point was you're arguing stupid fucking pedantics instead of about the topic at hand. You can feel a shock when you shift in the fastest shift mode, I don't care if it's called Sport, Sport Plus, or OMFG THIS TRANS SHIFTS HARD.

You came in and said you could not in either of your cars. It is obvious why you could not accomplish this in the IS-F since it does not have a proper gear box, and you have quite obviously done everything in your power to try and avoid that it does happen in the Porsche.

Are you going to whine to all the other people that brought up auto transmissions in this thread as well?

You said Sports, so I tested Sports. Sports Plus isn't normally used outside of the track. Do you expect everyone to read your mind? Next you'll be upset I didn't try the paddle shifters, or shoot up to redline, or try it on a cold day or ???. You claimed to have test driven twice and noticed it. Well, I own the car and after a couple thousand miles I never noticed shift shock. End of story.

Next time, pay the money to get a good car and maybe you too will notice that there is no shift shock.

 

[EightySix Four]

Are you going to whine to all the other people that brought up auto transmissions in this thread as well?

You said Sports, so I tested Sports. Sports Plus isn't normally used outside of the track. Do you expect everyone to read your mind? Next you'll be upset I didn't try the paddle shifters, or shoot up to redline, or try it on a cold day or ???. You claimed to have test driven twice and noticed it. Well, I own the car and after a couple thousand miles I never noticed shift shock. End of story.

Next time, pay the money to get a good car and maybe you too will notice that there is no shift shock.

Do you know what WOT means?

 

[CraigRT]

Try CVT!

 

[jlee]

Do you know what WOT means?

I'm trying to envision why a Porsche transmission (or anything with an automatic mode, for that matter) would upshift itself prior to redline with WOT in the equation.

It's just not coming to me...