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Author Topic: A500c - Temporarily loss of thrust when things get hot  (Read 577 times)

Exoticaholic

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A500c - Temporarily loss of thrust when things get hot
« on: February 13, 2011, 05:01:41 PM »
This thread is directed towards A500c owners and drivers due to its robotised manual gearbox....

Firstly, please excuse the pun, but have any owners and/or drivers got feedback on the fact that the A500c seem to lose momenteum when it changes gear in automatic mode?

To me, it felt as if power suddenly cut out and car slows down for a few milliseconds before it engages the next higher gear. It is pretty off-putting so I have to put it in manual mode so I can change gears myself. I am wondering if there is a solution to this as seamless gearchanges are what I like, but near to impossible in automatic mode? In higher priced and high powered cars, you would not notice whether it has actually changed up or down, unless you look at the display in front of you.

On a happier note and without sounding sad and a stickler for figures, this is the 500th post. Roll on the 1000th post!
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lloyd

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #1 on: February 13, 2011, 05:05:56 PM »
not a 500 but this was a characteristic of the Alfa 156 selespeed in auto mode. :thumbd:

Trooper

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #2 on: February 13, 2011, 05:11:58 PM »
This was my experience with a 147 sillyspeed i tested  :(

Always worth checking the hydraulic fluid level for the gearbox (worth checking often anyway) as this can cause many problems with robotised manual gearboxes  ;)

Maybe a software update could help  ???
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John501

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #3 on: February 13, 2011, 05:13:16 PM »
There was a software update for the gearbox a little while ago, may be worth taking it back and getting the dealer check.
The auto mode is never as smooth as the manual mode.
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Exoticaholic

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #4 on: February 13, 2011, 05:17:07 PM »
This was my experience with a 147 sillyspeed i tested  :(

Always worth checking the hydraulic fluid level for the gearbox (worth checking often anyway) as this can cause many problems with robotised manual gearboxes  ;)

Maybe a software update could help  ???


You've reminded me of my test drive in a 147 Selespeed several years ago. I have to say the loss of power was less noticeable than in the A500c. But not by a huge margin though.

Yes, you have good suggestions. My A500c has done nearly 2900 miles only so I might be barking up the wrong tree about low oil levels in it.

Apparently the 695 Tributo's electronics has been reworked so who knows? I will have to cadge a drive in it so I can collect my thoughts.
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Exoticaholic

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #5 on: February 13, 2011, 05:19:53 PM »
There was a software update for the gearbox a little while ago, may be worth taking it back and getting the dealer check.
The auto mode is never as smooth as the manual mode.


The last time I took my A500c there was on 15th January, for the rear brakes (well documented elsewhere on this forum) to be looked at.

I suppose that gives me another excuse to go there again - but I was going to order and collect the windstop anyway.

Thanks for the heads-up.
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slicker

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #6 on: February 14, 2011, 10:25:28 PM »
Had our 500c since October but not done may miles. However, to get smooth gearchanges in auto mode you need to anticipate the change and lift off the gas for a fraction of a second, as if you were driving a manual.

Takes some getting used to but it does smooth things. Also, easier to do this in Sport mode as the box really tries to get into a higher gear too quickly in eco mode.

Best of all is to use the paddles.

S.

Aeroman

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #7 on: February 14, 2011, 11:46:56 PM »
The previous robotised manual that we have had was in a 911, that we sold last year, and it had the PDK gearbox. I must say that this was much smoother in auto than the one fitted in the Abarth, but being a twin-clutch one would expect this as it pre-selected the next gear based on sensors in the car and the way you were controlling the throttle. The only criticism we had was that it short-shifted to get into 7th ASAP, regardless of the circumstances, so that the fuel consumption figures looked good. >:(

In sports mode, the Porsche engineers had written a certain jerkiness into the software so that gear-changes were not as smooth and thus you knew that you were in sports mode; rather nullified the point of the box for me I think. I don't think a single clutch robotised gearbox will be as effective in road cars as yet as the PDK-box, but no doubt it will come in time. I read an interesting article by Martin Whitmarsh recently explaining how the twin-clutch concept was unnecessary in F1 cars as it was too heavy, and with modern electronics is was possible to engage two gear momentarily  :o and thus maintain continuous drive to the rear wheels.

This may be a bridge too far for road cars as yet, though I am sure that with Ferrari F1 technology it must be possible. Maybe for now we have to put up with the slight delay whilst the Abarth box sorts itself out, or stick it in manual and have pretty instantaneous shifts.   :thumb:

Bear

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #8 on: February 15, 2011, 12:14:15 PM »
I agree with Aeroman, my old M3 had the SMG box (single clutch) which was cutting edge when I bought it but no longer. In manual you could drive it fairly smoothly but in auto it was hopless as it was near impossible to anticipate when a gear change would happen which highlighted the break in power as the clutch was engaged. Even in the gentlest setting it just slipped the clutch more as the gear engaged thereby exacerbating the problem. I just considered it a manual only and never used the auto setting. I think that it is just an intrinsic problem with any manual single clutch system with an auto option.

ctsui35

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #9 on: February 15, 2011, 01:16:40 PM »
The porsche auto is well smooth in comparison even thou , I haven't driven it since January. Thats why I like to drive it using the paddles on the A500c and with the custom exhaust it drags the gears down too early and makes the car bellow, which makes me seam like a plank too. :thumbd:
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Exoticaholic

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Re: A500c - Temporarily loss of thrust when things get hot
« Reply #10 on: February 15, 2011, 06:08:05 PM »
Thank you to all these who took the time to reply.

It's pretty irritating to be honest, so manual changes all the way for me! At least until it gets looked at, as per John501's comments about the recent software update.

I just want everything to get right before the European drive.
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