mx5cartalk.com

I wanted to put an LSD in my SP, and was thinking of picking up a TORSEN core.

I was wondering if anyone had any input about whether or not the TORSEN is the way to go, or an aftermarket clutch-type LSD? Is there a significant difference between the TORSEN 1 and 2?

When it comes to installation, I read that the TORSEN diffs from the Australian car it probably came from an SE so I would need the original half shaft? What other parts would I need to get to install an LSD?

I've put Lightened Flywheels in other cars that I've owned, and its made the single biggest difference in driving quality every time so I'm keen to do the same with the SP. I was wondering if anyone had any idea on the original weight of the flywheel, and suggestions on what flywheels suit the car?

Not a huge difference between torsen 1 & 2
1 is slightly more agressive in certain situation. Or slight difference in behaviour if you ease off the throttle during hard cornering.

Type 1 came in the clubman during the 90s.
Later ones were type 2 . Mine came from an JDM NB8A. Not many AUDM were fitted with LSD.
Until the SE came around. You only had the Clubman & 10AE that came with the lSD fitted like in other markets where there were plenty options.

Im unfarmilliar with the SE diff.

As far as the flywheel is concerned... it is the standard NB8B flywheel
I dont know what the weight is. Youvshould be able to find this witg a simple serach.

Lighter is not neccecary better. Think about the gripping properties of different materials. The NB8B suffered from clutch shudder. Pretty sure there was fix with a change of clutch but i dont think it involved the flywheel
Ive got a 1.6 flywheel fitted in an BP-4W.
unable to give a review as it has not been dríven yet. But going aroundc the front yard...it feels strange to before. But there are many other possible reasons for that

1993-1997=T1 (so in ADM 1993-1995 Clubman 4.1FD)
1997-200?=T2 (so 1999 10AE 3.6FD)
2004-2005 ADM SE 3.6FD=slightly different T2 (see below)
2005-21?? NC=Super Torsen

Nevyn72 wrote:ADM SE got a slightly different version of the T2 than that used in other NBs, it's actually the same as the one used in the Honda S2000, hence the extra spline on the output shafts.

Worth noting, that while there's no real difference between T1 and T2 from a driving perspective, the T2 is a stronger design of the two.

The T1 helical gears are held by a thin-ish section of cast material at each end, which under high loads/power can break.

The T2 helical gears are a different design, and are held in place pretty much their entire length, as they sit in a fully enclosed area.

I just swapped out the standard flywheel n clutch from a NB8A. Not sure if the helps you but here are some weights of standard vs the new one I installed

lambertius wrote:was wondering if anyone had any idea on the original weight of the flywheel

MX5 BP motor FWs got slightly lighter as the models progressed, ie 1993-95 NA8, 1996-97 NA8, 1998-2000 NB8A, & 2000-02 NB8B. IIRC, NB8B FW was about 17lbs.

I also believe the NB8B fly is about 17lb, but I would question putting a LWFW in the Sp as it is already a much much stronger engine than the NA model.

I put an SE torsen 2 in my SP a few years back, you do need the half shafts from the SE as they are thicker and have 28 splines vs the standard 26 on the diff side.

SE shaft on the left.



Installation was easy, gear ratio was the same as the stock diff and it was heaps of fun on the skid pan. Never had an issue with the torsen in there, I highly recommend.