Vilhuer

DSG, PDK or whatever these new style double clutch automatic manual gearboxes are called are future. Both old style manual and automatic gearboxes will die out. Only computer controlled DSG can meet future fuel consumption targets.

puyi

I would say http://www.hewland.com/svga/nlt.html

Sequential gear box for race car. Some adaptation have to be made, and it is a $20 000 project but it should work well.


Stephane

puyi

antother one : http://www.sadev-tm.com/fr/#



Stephane

slate blue

I like Ryan's idea, lets assume you can fit it up, that will cost between $2 to $4K for adaption. How do you run it? That is what would be the real challenge. I like the fact that it doesn't have a torque convertor, as far as I am aware it is the part that is rev limited. 6800 rpm is the limit I have heard. When you are building a high rpm engine, mainly because of the limits of the standard gearbox. High rpm low torque to avoid breaking it.

You would need to speak to a technician regarding that gearbox, my guess it is very complex to control and would be too hard.

Greg

slate blue

Edit, the AMG gearbox is only good for 7,200 rpm, also it is a pity the Ferrari gearboxes have offset input shafts. I almost bought one, super strong, bolts up to our CV shafts blah blah. Anyway wont work because of the input shaft.

Greg

123quattro

Getting that Mercedes box to work would be a nightmare. 1. the engine inertia is mapped into the launch clutch. That would be all wrong. I really doubt anyone has the resources or money available to get that redone. Secondly, any new automatic transmission relies on being able to control engine torque during shifts. 928 engines don't have electronic throttles or an ECU that is torque based.

I really think you guys are wasting your time trying to adapt a new electronically controlled trans of any type.

IcemanG17

The PDK or BMW DCT is essentially the same thing....the box is built by Getrag and is available to anyone with the $$$ It is a wet dual clutch with 7 gears and is rated for 443ftlbs....it is HEAVY at nearly 100kg....and thats just for the trans..not the rear end!!!

I have this trans in my M3 and it is incredible....similar things are said about the PDK in P-cars...shifts far faster than any driver can and works great.....

I had a good discussion with Mark A today about the "strength" of the 928 5 speed...he brought up a good point....in his older 928's with around 400hp or less he had virtually no problems with the trans....it wasn't until his monster motor that he had problems.....and it does appear most of the 928 race car trans problems are in stroker motors with all that torque.....

There are some powerful automatics out there...but none are subjected to road course stresses...a couple perform well in open road, but thats a different story compared to road course racing.... I have been very happy with the 4 speed in the estate..but its only moving 2800lbs with 195whp-236 torque..so its hardly trying.....as reflected by its 190F max trans temps....

Hmm...maybe for the sake of arguement I should boost the estates engine to add some stress to the trans....just to see how long it can take another 100whp & torque

RyanPerrella

The 7 speed automatic i mention being used by Mercedes is a traditional automatic in the sense that it uses multiple clutches and planetary gearsets to control gear ratios and shifting. It is however different in that it uses a wet clutch setup to link the engine flywheel to the input of the transmission. This leads to a very different response from the typical automatic and this is what i was leaning towards with my comment earlier in the first page.

Its interesting that most car mags are now considering the Dual clutch like the PDK, the S-tronic, MDCT and whoever else is using the dual clutch setup now as automatics. So in a sense the typical automatic is dying out in the performance segment, but I think they will always be there in your large luxobarges and so on. And the dual clutch automated manuals or manual automatics or whatever we wanna call them will remain with the more sporting variety of cars.

Vilhuer

Traditional automatics are inefficient compared to manual gearbox, which PDK etc really is. When converter is replaced by computer controlled clutch old style automatics are better but its still less efficient than manual box. This means they will eventually have to be phased out to get every last drop of fuel economy out from the drivetrain. Unless someone comes up something revolutionary new technology PDK will be only choice in about 10-15 years.

Imo000

The Borg Warner T-5 and T-56 bolt onto their bell housings with 4 bolts. Unlike conventional manual transmissions, the trans case and the bell housing are not a single cast.

Jim Nowak

I had a CL600 bi-turbo tuned by Renntech. It had around 800 lb-ft of tq with a conservative tune for pump gas. The Mercedes tranny was good to around 1,000 lb-ft.

Imo000

You can stop the Earth from turning with that much torque!