Hi everybody,
I thought I start a thread for all those who are interested in rear LSD for the TTRS/RS3.
As some will already know, the biggest problem is: there is none to buy…
There was also a thread here about a Wavetrac LSD for the Haldex IV. Unfortunately, the project was terminated prematurely, as it turned out that the differentials of the Haldex IV equipped cars (TTRS / RS3, S3, Golf R, ...) are different and therefore it´s probably not economical for them to offer one.
At least that's how I understood it…
Nevertheless, I wanted to have one for my TTRS.
Since I've dealt a bit with AWD systems, I´m convinced that a rear LSD is necessary for a sporty AWD system…
Even if I have to say after all mods (all in my signature); there is hardly anything to criticize about the handling of the TT.
Only in situations when accelerating out of corners, the rear could help a bit more for my taste.
And there, a rear LSD should bring a noticeable improvement.
Unfortunately, as mentioned above, no one offers an LSD for the newer Haldex generations. But you can get one for the earlier (slip-depended) generations…
So after talking to some people who know a bit about differentials, we decided to take a closer look ourselves at the differences between the Haldex generations.
The plan was to modificate an LSD from the older generation, that than fits into the rear unit of the TTRS.
We organized used rear units from a Golf R32 and a TTRS.
We dismantled both and measured them exactly to create CAD Models.
The differentials are quite different on the outside as you can see here:
R32 vs. TTRS
But the good news is that the internals are the same.
We created CAD models, and after a bit of tinkering on them, we were pretty sure that the R32 diff can be converted for the TTRS rear unit. (Some new parts are required)
So we ordered a Wavetrac for the R32.
Machining the "Wavetrac" parts:
TTRS Wavetrac with new bearings and ready for install
All parts were laser welded to minimize warpage
So after driving it about 300miles now, I can say it’s absolutely worth it.
No vibration or any disturbing noises…it does exactly what I expected from a rear LSD.
The car rotates very easy and controllable under power now.
I first tried it with the OEM Haldex controller, which also works well, but I recommend installing an aftermarket controller. Under power there is no big difference, but when lifting the pedal just a bit, the OEM controller immediately disconnects the rear and the benefit of the LSD is gone...
Finally a short video just to get an idea of how it behaves (dry pavement with Michelin PSS):
I thought I start a thread for all those who are interested in rear LSD for the TTRS/RS3.
As some will already know, the biggest problem is: there is none to buy…
There was also a thread here about a Wavetrac LSD for the Haldex IV. Unfortunately, the project was terminated prematurely, as it turned out that the differentials of the Haldex IV equipped cars (TTRS / RS3, S3, Golf R, ...) are different and therefore it´s probably not economical for them to offer one.
At least that's how I understood it…
Nevertheless, I wanted to have one for my TTRS.
Since I've dealt a bit with AWD systems, I´m convinced that a rear LSD is necessary for a sporty AWD system…
Even if I have to say after all mods (all in my signature); there is hardly anything to criticize about the handling of the TT.
Only in situations when accelerating out of corners, the rear could help a bit more for my taste.
And there, a rear LSD should bring a noticeable improvement.
Unfortunately, as mentioned above, no one offers an LSD for the newer Haldex generations. But you can get one for the earlier (slip-depended) generations…
So after talking to some people who know a bit about differentials, we decided to take a closer look ourselves at the differences between the Haldex generations.
The plan was to modificate an LSD from the older generation, that than fits into the rear unit of the TTRS.
We organized used rear units from a Golf R32 and a TTRS.
We dismantled both and measured them exactly to create CAD Models.
The differentials are quite different on the outside as you can see here:
R32 vs. TTRS
But the good news is that the internals are the same.
We created CAD models, and after a bit of tinkering on them, we were pretty sure that the R32 diff can be converted for the TTRS rear unit. (Some new parts are required)
So we ordered a Wavetrac for the R32.
Machining the "Wavetrac" parts:
TTRS Wavetrac with new bearings and ready for install
All parts were laser welded to minimize warpage
So after driving it about 300miles now, I can say it’s absolutely worth it.
No vibration or any disturbing noises…it does exactly what I expected from a rear LSD.
The car rotates very easy and controllable under power now.
I first tried it with the OEM Haldex controller, which also works well, but I recommend installing an aftermarket controller. Under power there is no big difference, but when lifting the pedal just a bit, the OEM controller immediately disconnects the rear and the benefit of the LSD is gone...
Finally a short video just to get an idea of how it behaves (dry pavement with Michelin PSS):
eace:
