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View Full Version : Questions for the TT'ers


Quattroism25
01-09-2009, 02:05 AM
Why did audi choose the haldex instead of the torsen quattro system in the tt and a3 model ranges? Is it because of the transverse engine, packaging restraints, or just plain too cheap to do it? The reason I asked, I was reading a review of the new tts and noticed this.
This may be a front-wheel drive based chassis that only apportions power rearward under slip...
So for the most part it's still a fwd car until additional torque is sent to the nonslipping rear wheels. All new audis are getting that 60/40 rear biased quattro setup, and the S/RS models are getting the sport rear diff. If the TTS and TTRS still have the front biased haldex, 0-60 aside, I don't see them being true competitors for the cayman s and carrera s. Am I missing something here?

WishIWasRWD
01-09-2009, 02:16 AM
Cheap... end of story.

Murderface
01-09-2009, 04:12 AM
Cheap... end of story.

x2, the Mk1 TT was based on the VW A4 platform...which is the same platform as the Mk4 Jetta/Golf. Cheaper to incorporate transverse AWD instead of design another chassis to accomodate longitudinal.

l88m22vette
01-09-2009, 08:30 AM
The MkI uses the simple slave system Haldex set-up, and yes it was because it was easy and cheap. Even if the MkII ends up having only a 50/50 power distribution a "sports" rear diff would give the feel of rear power bias and handling. It works for the MkI, ask M this 1! on Vortex, he has a rear Peloquin LSD (lucky bastard lol)

Cincy
01-09-2009, 10:47 AM
For 99% of the people driving a haldex based car (TT/R32 etc) the haldex system and its setup is sufficient. Not to mention it is a better crusing awd system since you dont have additional drag on power causing you lower mpg. Sure a STi setup is probably better since you can change power split by choice, but haldex has its advantages.

Quattroism25
01-09-2009, 12:32 PM
Yea I see the mpg advantage. The tt is a sporty car but I'm talking about the TTS and RS. I'd choose the S/RS over a z4 m coupe or cayman s just on looks alone. But for the few people who are actually gonna track this car I just don't see it matching the m coupe or cayman/911 in chassis dynamics. Which it probably could with a 60/40 split and sport rear diff. I dunno, for 70k+ and the target being m coupe and cayman drivers, audi should have made no compromises. Well maybe thats why the midengine R4 is in development. Which only nullifies the TTRS. Audi is confusing me lol

Cincy
01-09-2009, 01:16 PM
The haldex will be in full split basically throughout the track event. A controller will change how it engages and disengages and will aid in performace. You basically wouldnt know your car is mostly fwd when it is. As for the MKII TT, its new suspension is very advanced and will allow it to hang with just about any other car model stock

l88m22vette
01-09-2009, 06:04 PM
If the AWD transfers power in two smooth steps it would feel RWD: fwdish -> awd -> awd+read diff. Also, the torque of the blown-5 in the upcoming RS will scoot away from the NA 6cyls of the Z4M/Cayman S :)

Anyway, AWD can ultimately put down more grip (which is why it was banned in many motorsports) and be faster, it is about the parts and settings. With adding just my Haldex Blue and rear sway my car feels wayyy better, and the TT would have gotten far better performance reviews if this had been the stock set-up.

Cincy
01-09-2009, 08:23 PM
and the TT would have gotten far better performance reviews if this had been the stock set-up.

Dont forget the org front suspension they had to dull down