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I would be interested to know which shop is advising you.
The set-up they recommend is what 9M, for example, calls a "fast road" set-up. I ran something kind of similar for about 3 years on my 89 car which came with the 1mm bigger rear torsion bars as std (25mm) and a smaller rear sway bar, which I replaced with a 22mm adjustable sway bar. Damping was Bilstein HD. It is a nice road car set-up that works ok on the track. I had fun with it for 3 years before getting bitten with a more hardcore track bug. I have also riden in and followed various 3.2 CS cars and an early 3.2 running the exact same set-up you are looking at - std front torsion bars and 26mm rears. My car runs 22/29mm torsion bars and is quicker than all of them - so far anyway. The car with the "fast road" set-up was running newish Michelin Cup tyres vs my very old Dunlop/Pirelli R compounds and simply couldn't match the corner speeds in steady state cornering. Too much roll and weight transfer and the tyres just didn't perform to their optimum.
IMHO, the fast road set-up is just that, a good road set-up that will let you have fun on the track. If you are using R compounds and have done any other mods - sounds like you have reduced weight - then I would strongly recommend you go to big t-bars. 22/28 is a popular combo but in my opinion is too understeer biased. I have my bigger rear sway set full hard with the 22/29s and still feel it has a safe understeer bias. I notice this particularly on wet tracks where balance is easier to feel and limits easier to explore.
It really depends what you want. I used to have to toss and catch my car to get it to rotate on some corners and on road tyres that was fun. Now on R compounds and much stiffer it just turns in and grips. It's still adjustable and getting up to the limit can be a scarier experience because you are going a lot faster but its really nice to be able to lap at a similar pace to the more modern cars. I have spent laps pinned to the rear bumper of MkII GT3s, 964RSs etc, which is fun with a capital F. I don't for a second claim my car is faster or even as fast as GT3. 964RS etc but on track days where the drinving standards vary so much, you can often keep up with much more impressive cars.
The RSR comparison is not a good one. Tyre technology has moved on 30 years since then and the RSRs are much lighter. A better comparison is to look at how much stiffer Porsche made the 964RS compared to the std 964. And the 964 Cupcar stiffer again.
Just my $0.02.
Richard
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