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Discussion Starter #1
Anyone knows what the sentronic +2 overdrive transmition is on the new 9-3 SS aero

When do the two overdrives come in use?
 

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This is about all I could find on it....

Saab Sentronic+2 (Automatic 5-speed)
Sentronic +2 – is available in the Aero model. It is an advanced automatic 5-speed transmission with two extra intermediate gears. These provide faster acceleration in automatic mode. As with the other Sentronic transmissions, you
can also shift gears manually. You can even specify paddles on the steering wheel.

http://www.saab.com/main/image/brochure/2005/93s/brochure_93S_IE.pdf
 

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Is it the same as this?
Automatische vijf+twee versnellingsbak

I saw this option on the Swedish Saab site but couldn't translate it.

I wonder where this can be found besides Sweden. The brochure is for 2005 models.
 

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Viscouse said:
Is it the same as this?
Automatische vijf+twee versnellingsbak

I saw this option on the Swedish Saab site but couldn't translate it.

I wonder where this can be found besides Sweden. The brochure is for 2005 models.
Huh?! That´s not swedish...I think it might be dutch, and my best guess is that it means "Automatic gearbox+paddles (for the steering wheel) but I´m not sure...:roll:
 

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Discussion Starter #5
When do this overdrive are used? I have been driving my new aero for two months allmost and I am not sure when these overdrives kick in. anyone has details on how they are used and what is their purpose? I know we don't activate them manually, but would like to know more about it.

thanks
 

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aeroride said:
When do this overdrive are used? I have been driving my new aero for two months allmost and I am not sure when these overdrives kick in. anyone has details on how they are used and what is their purpose? I know we don't activate them manually, but would like to know more about it.

thanks
They are not overdrives, they are gears that sort of come between the other gears to make the acceleration faster and smoother. Saab calls these gears 2,5 and 3,5 i.e. they come between 2nd and 3rd gear and 3rd and 4th gear respectively.
 

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AeroSwede said:
They are not overdrives, they are gears that sort of come between the other gears to make the acceleration faster and smoother. Saab calls these gears 2,5 and 3,5 i.e. they come between 2nd and 3rd gear and 3rd and 4th gear respectively.
Which is the same as the sentronic auto 'box on the 9-5.
In a manual gearbox, it's possible to have 'overdrive' ratios (4th and 5th) to give the low revs at cruising speed, but the acceleration is from the lower (numerically higher) diff ratio of around 3.5.
On the autobox, the top gear (5th) is effectively direct top, not an overdrive, which means to get the same low revs at cruising speed the diff ratio has to be higher (numerically lower) and is 2.44. But, this would mean the car would have very poor acceleration, so the intermediate gears in the gearbox have a much lower ratio to allow the car to accelerate and overcome the high diff ratio.
 

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So .. are we really talking about two physical gears in the gearbox, or a trick with the torque converter .. Obviously, I flunked "Automated Transmission Theory"
 

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mbodo said:
So .. are we really talking about two physical gears in the gearbox, or a trick with the torque converter .. Obviously, I flunked "Automated Transmission Theory"
Ehum, so did I... ;oops:
 

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AeroSwede said:
Ehum, so did I... ;oops:
Glad to know I'm not the only one!!! :lol:

Anyone know if this is new to the newer models (i.e. updated transmission) or a new trick the old transmission does? More "gear" ratios would lead one to beleive that accelleration times would be better.

Heck, I wonder if SAAB will ever go CVT.
 

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I wonder why Audi is the only manufacturer that has the DSG? The DSG has (if I understand it correctly...) 2 clutches which makes the acceleration just about as fast as it can be, for instance, the A3 3.2 Q is around ½ second faster than manual 0-60.
Or is there a huge downside? The cost for the DSG at AUdi is the same as any automatic..
 
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