Quote:
Originally Posted by ivangene
this is so distrurbing as I had a set of 28 rears and looked long and hard fpor 22 fronts and thought I was lucky to get a set of 23's.... then was told 23/28 was going to push and I should find the 22's... I asked what about 23/30 and got "the nod" so sold the 28's and got some 30's.....
now I am worried its going to be too much cowbell....I also dont know what anti-sway bars I have but I would bet 100% they are stock based on the car history....
At this point I am fairly commited to going forward....I will re-valve the shocks while its apart.
thoughts on the 23/30 match?
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Years (decades?) ago I ran 21/28 on an SC I had, soon switched to 22/29. Also had H&H sway bars (how's that for dredging up some history), 22mm adjustable at each end. That was OK for street and track, and anything stiffer would likely have just caused too much flex in the Targa chassis.
My next SC, a coupe, I started with the 22/29 with Weltmeister sways and was never happy on the track but it was quite nice on the street.
Fast forward to the late 80's and an '86 Carrera I had. 22/29 was just too soft in that heavier car, so I tried the 23/30 route. Way too much understeer. so I settled on 23/31 with custom valved Bilsteins, Jack French valving specs.
Current Carrera, started with 23/31 and stock Bilsteins. Boy it was uncomfortable, and not as much fun as I'd remembered from my previous 911. Sent the Bilsteins to be rebuilt and revalved to the specs I had from 10 years earlier. What a difference, but still too much understeer at the track. Moved to 23/33, had the rears revalved to match, and that's what I've run for years now. Beautifully balanced car on the track, custom valving actually helped the ride quality because the shocks could control the torsion bars.
So ultimately, it's a personal choice. And there's always a compromise between street and track. But the real lesson I learned more than 20 years ago when I first discovered Bilstein's revalving service is that once you move much beyond stock torsion bars, stock Bilstein valving is less than ideal. Can probably get away with Sport Bilsteins with 22/28's but past that and you really need to get the shocks valved to match your torsion bars, car weight, intended use, etc. It's worth the investment, and you will be amazed at how it works.