I you want a car with traction control I'd suggets buying one. So - not a GT3, then.

The PSM system, as fitted to the 996 and Boxster range, is fantastic. It does not step in other than when things are going badly wrong.

The 935 look alike race car that I drove at Spa last year had a traction control system fitted. I imagine it was race logic. It did have sensors on the hubs and it was wired through the cars Motec ignition system. Additionally there was an on off switch and an adjustable dial on the dash. The sad bit is that whoever carried out the installation of this system bu**ered it up and it did not work at all, so I never got to find out if it was effective.
So not much help to the OP BUT. The conditions that the Britcar raced in at Spa last year where horrendous, with torrential rain. Probably the worst conditions that I can ever remember racing in. Even running full wets the car would aquaplane towards the top of the Kemel Straight at about 115mph. TC would not have helped this and in truth unless I could emphatically prove to myself that the TC knows best I would never have used it. In fact testing at Spa the week before in the wet I only tried it in the last session of the day as the chaps preparing the car wanted to make sure it worked and it did not.
My advice is it is unnecessary and don't do it. That learning how to understand the behaviour of your car is far more important and if anything the TC may lull you into a false sense of security and potentially bite you in the ass. Spend the money on good tyres, suspension and geometry.

I don't think its that sophisticated but haven't looked at the web bumpf for a while. There is a load on there site about it :

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The system works by monitoring the speed of all four wheels using the ABS system or specially fitted sensors. When wheelspin is detected the engine power is reduced, by cutting a single injector pulse or a spark, until grip is resumed. This occurs in a thousandth of a second, and appears to the driver as a slight miss-fire with no loss in acceleration.

Maximum acceleration is achieved by limiting the slip between the tyre and the road. The point at which a tyre is just beginning to slip against the road gives the maximum coefficient of friction value.

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http://www.racelogic.co.uk/?show=Traction_Control

It's like the TCS they had in F1 where you can mash the the throttle on corner exit and it will find max grip without power oversteer. This is why I don't see it being the same as an LSD as that will quite happily let you snap the car around on the throttle if road grip disappears very quickly. Of course I've not tried this system so no idea how well it would work in that situation, but the reviews of Elises which apparently use this are very positive.

Thanks for all the comments. I thought it may throw up a few discussions... Ive had 2 wheel rear drive cars before with a TVR, m3 breadvan and a Lotus exige. The exige was a cup car which had this kind of TC on it and it worked well. I know its probably best to get a car with a TC system on it if Im that worried, as I said, I have considered a 6TT. The problem I have is that I dont really like the 6TT, and more importantly I lost the M3 coupe in a spin many years ago and that shuck me up. The back wheels lost it - and this was when I was gently (yes this is true, no lie) accelerating in a straight line! I was only doing about 20mph and had no control of the car what so ever. This does make me sound like a bad driver, but to my defense I am nearly 40, have been driving rear wheel cars for 10 years or so and have caught spins, slips ect before.... Now I know that Im no racing driver, or driving god, but equally I dont expect a car to behave like that. The good thing about the spin is that it did make me realise the imporance of good tyres and car set up, as I think the reason the car spin, with no way of getting it back, was due to its poor state (it was booked in at the local BMW for a few things to be changed on the rear suspension...)

Anyway, I liked the security of the TC on the lotus (which I think was a racelogic system). I dont intend to be in a hedge, but anything which I can do to prevent this (appart from driving a diesel) in the one in a 1,000,000 chance that may happen like this again, Im prepared to consider.

ChrisW - Do you go to any meeting in North Yorks for the porsche club? I did go to the TVR and Lotus ones once in a blue moon when I had those cars. Maybe then I could meet some GT3 owners to have a look firsthand at some Mk1s to see what they are like.

I'm inclined to agree.

No you won't... Whichever wheel has lost traction in isolation will always try to get in front of the rest of the car. If both rear wheels are spinning and the steering is pointing straight ahead you will stay straight (unless there is a camber or your start waggling the steering)

If you don't believe me it is a very easy theory to test: Get a toy car with rubber tyres and put sellotape around one of the wheels and then roll it down a slope... Whichever way around you do it, the wheel with least traction (i.e. the sellotape) will try to get in front of the rest of the car

I know what you mean, I probably did not write the previous reply very well. I have had faster cars than a 996TT, and Im still alive, I do drive quite sedately. I dont take risks when driving and really Im asking myself why do I want a GT3 as I would really never get anywhere near its limits by the way I drive? For me, I do pick the cars I have had partly due to the "special feeling" you get from driving them no matter what speed you are going.

But, I just dont want to buy a car that has a similar ability to the z3M coupe I had which just wanted to change directions when you looked at it, never mind when driving it. I believe the porsche would be better as it has been designed as a sports car from the start (Im not convinced the z3 is really in that class). Hopefully that gives you a more rounded understanding of what Im looking for.

Cheers Mikey