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How much a difference in ride quality vs handling between the 1 inch torsion bar and the 1.18 size?

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Significant. You need to compare the wheel rates and vehicle weights. The wheel rate is almost doubled. 175 vs. 338 lbs/in.

Some other opinions here but the guy with the 1.12 T-bars just got it back together and has barely driven the car yet: http://www.cuda-challenger.com/cc/index.php?topic=51462.0

Controling a big spring with a good shock is very important to ride quality. IIRC, Clair Davis has 1.14 T-bars with 350 lbs/in rate in his A-body. He doesnt think it's too harsh. But when changed from KYB to QA1 shocks things got much much smoother.

IIRC, Clair runs 245/45/17 series tires with 17" rims. Sidewall thickness and tire construction will make a significant diffrence too. You run a 235/40/18 and that will make the ride quality go down. Remember a 275/40/17 has a bigger sidwall than a 225/40/18



From the www.firmfeel.com website..

Bar
Diameter Rate Application Per Pair
.880 101 Drag Racing $285
.940 142 Stock HP/Police $285
1.00 175 HD/Street $285
1.06 225 HD/Race $310
1.12 270 Race $310
1.18 338 Race $335