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      03-27-2008, 03:39 AM   #100
footie
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Enigma and Swamp,

You guys are still think of DCT like you would SMG, eg. one clutch controlling all of the gears. The jerk is engineered, please go and get a bit of advice on DCT and dual clutch technology before ranting.

Quote:
Originally Posted by ToothDoc
The Veyron doesn't have the jerk because they don't want it. With 1000 HP, any slight increase in acceleration would cause it to lose traction instead of accelerate. The F1 cars also have seamless shifts because of their massive HP:weight ratios. Any slight jerk will cause unbalance.

So, if you have ENOUGH HP, you want smoooooth. If you don't have enough HP, you want all that energy transferred to the wheels during gear shift.
Correct in your comments on why you don't what jerk but to think that the Veyron would suffer from traction issues, the Veyron can put all of it's 1160hp (yes that's right) to the road even in the rain. The reason jerk is unwanted is because it will cause unbalance the chassis during cornering.

Quote:
Originally Posted by ToothDoc
In theory, the best tranny is the CVT. The CVT would give you NOTICEABLE improvement over the DCT. Only problem is that the CVT has not yet been able to handle the torque.

Maybe one day, M3s will be CVT. How boring would that be? LOL. Maximum HP all the time during S6 mode and you can have an "E" mode for maximum efficiency for fuel economy to prevent the gas guzzler tax.
ICT is the future, not CVT and BMW are a big player (among other car and gearbox manufacturers) in this technology as they are co-testing this technology with http://www.torotrak.com/, the company which invented it. Unlike CVT IVT can cope with more torque than is currently produced by any production vehicle and unlike CVT it uses special oil which increases friction, specially developed by Shell. The advantage of IVT is that it will optimise the engine's power and torque by acceleration at the optimum rev point unlike either a manual or automatic which has fixed ratios.

P.S.

And not a jerk in sight.