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Hi Mike,
With 150lb/in springs on the front the 944 rear TBs will be a little too soft to balance the car (I think), especialy with the heavy Scooby motor. I'm running 100lb/in front and 944TBs on the rear with a standard T1 motor. It has a 14mm 944 rear A/R bar but that is for autotesting and if it gets too tail happy for my wife and daughter I will simply disconnect it until I need it. Springs in 2 1/4" format are quite cheap so it is eminently feasible to try 100lb/in and 130lb/in springs to see which gives the best balance. You then have a choice to increase your roll stiffness - thicker/add AR bars or increase the rear spring rate. Your dampers are I assume adjustable to cope with the varying spring rate?
I do have a gut feeling that the best balance/drivability will be 130lb/in front springs 19 AR bar, 25.5mm equiv TBs with a 14mm A/R bar.
Clive
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