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Re: Interesting torsion bar discovery... [Re: MuuMuu101] #2567671
10/22/18 04:12 AM
10/22/18 04:12 AM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
Striving for excellence
Kern Dog  Offline
Striving for excellence

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Granite Bay CA
Originally Posted By MuuMuu101


The B body bar will have about 10% more twist in the torsion bar for the same diameter, material property, and torque.


10% more twist?
Do you mean that it is less effective because it twists MORE or more effective because it resists twist 10% more ?

Re: Interesting torsion bar discovery... [Re: Kern Dog] #2567807
10/22/18 01:35 PM
10/22/18 01:35 PM
Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101 Offline
I got lucky at Woodward!
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Posts: 12,375
SoCal
Originally Posted By Frankenduster
Originally Posted By MuuMuu101


The B body bar will have about 10% more twist in the torsion bar for the same diameter, material property, and torque.


10% more twist?
Do you mean that it is less effective because it twists MORE or more effective because it resists twist 10% more ?


Because the B-body T-bar is longer, it is less effective because it twists more.

Re: Interesting torsion bar discovery... [Re: DrCharles] #2568309
10/23/18 12:55 PM
10/23/18 12:55 PM
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Posts: 5,385
Pikes Peak Country
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TC@HP2 Offline
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Pikes Peak Country
A 1" B body bar is 175# wheel rate. A 1" A body bar is 195# wheel rate. Wheel rates are the springs applied force at the center of the tire's contact patch. This is how you can compare different spring rates and suspension designs to come to an apples to apples comparison of rates.

In my experience, a larger bar gives up an amount of 60' time, however, it will be much more consistent and repeatable than a lighter bar and 90/10 shocks.

My drag car with SS rear, light front end rates, no sway bars, and adjustable drag shocks would run 12.2-12.6 and was variable with track prep and atmospheric conditions. The same driveline in my handling car with heavy t-bars, large front and rear sway bars and much wider tires all around would run 13.2 run after run after run. If you're a bracket racer, you know which one you need to have to win.

Re: Interesting torsion bar discovery... [Re: DrCharles] #2568361
10/23/18 02:22 PM
10/23/18 02:22 PM
Joined: Apr 2006
Posts: 4,220
West Plains, MO
DrCharles Offline OP
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West Plains, MO
Thanks. I am not planning to run limp t-bars and 90/10 shocks on the street, where my car will be 90% of the time.

I did some more reading... turns out PST now makes the 1.03 bar with the proper clocking (too many complaints/returns from people who didn't want the "slammed" look). $239 with free shipping. I also learned that as a FABO member I get 10% off. Down to $216. Not bad for new bars!

Re: Interesting torsion bar discovery... [Re: DrCharles] #2571072
10/29/18 04:37 PM
10/29/18 04:37 PM
Joined: Jan 2010
Posts: 1,440
NW Chicago suburban area
Mopar Mitch Offline
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pro stock

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Posts: 1,440
NW Chicago suburban area
I've tried many different sizes of TBs in the Challenger... and some different shocks.. and different leaf springs... for the purpose of competition AX/HSAX... settled with the 1.24 TBs... they are great! Yes stiff, but still drivable on the street and highway... as long as you avoid rough roads (race tracks typically are smooth!). Tire pressures and sidewall aspect ratios matter, as well, so, it becomes a compromise to accept what you've got and learn to drive the car with the setup. A benefit of larger TBs is that they also reduce lift and dive.


Mopar Mitch "Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers! Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
Re: Interesting torsion bar discovery... [Re: DrCharles] #2571560
10/30/18 12:43 PM
10/30/18 12:43 PM
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Pikes Peak Country
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The reduction in that lift and dive is where bigger bars give up performance at the drag strip. However, they are much more consistent in the e.t. department and are a significant improvement in street manners. I think Dr Charles will find the 1.03 bars for his dual purpose car will give me a much better mannered street car but will cost him some in the ultimate e.t. at the track. IMO, a fair trade off for something that is 90% street orientated.

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