Not_Sure

I just installed a 19mm rear. but I decided to comepare to the 18mm I pull off. the softest hole looks slightly further back than the on on the 18mm, Will the softest setting on the 19 still be firmer than the 18?
can anyone who has run both comment?
I didn't compare them back to back (with 28.6 front) but I did give it a test drive last night, just around the neighborhood, only one turn that i could really "test" it (but I didnt test the 18mm on this same turn) but as I was trying to feel it out, the turn in seems fine, so I kept turning more....Ok,,,,little more... Ok, a little more, then I felt the front start to oversteer, and by that point I was through the turn. I guess I was expecting a little more "darty" feeling on turn in.

T&T Racing

Bar Stiffness varies to the 4th power of the diameter. In your case, the 19mm bar is (19x19x19x19 )/(18x18x18x18)= 1.24. Using the lever arm hole setting ratio, you can determine overall stiffness. But the bottom line, the softest 19 mm bar setting is stiffer than the 18 mm single hole.
Matched with 26.8 mm front bar, you have a car that has the potential to oversteer with front spring rate and rear torsion bars effective spring rate as you experienced

Not_Sure

[=-po[3ppffffffffffffok good to know.
Now the question is, as you may have seen in my other thread comparing the 968. So turns out the 968 has a 25.5 rear T-bar, and the 931 has a 23.5. If hypothetically I was to put a 25.5 in the 931, would that give more of the "solid" feeling the 968 has? what other effects would that have? ( i have 300lb front springs, and 475 rear coilovers to go on, when I install the Poly bronze spring plate bushings). Im looking for "controlable oversteer" More on the initial turn in, than deep in the turn.

(all that being said, I guess I should have mentioned that I just rebuilt all the front bushings, with poly and the car currently has 225+/- front springs. I didnt have the car aligned yet, but after the rebuild it now slightly pulls to one side(didnt remove the steering)

T&T Racing

Is the rear coilover spring setup using a rearTB delete?
If so, then the 300 lb front springs rates and rear failover 450 spring rates are a good match. The bronze bearings makes the rear a little stiffer.
I cannot answer the question on changing out the 931 TB except the 968 makes the rear stiffer.
As far as overseer, I want the race car to rotate prior to apex after apex to be able to go to full throttle at apex in the race car. My rave car does not oversteer at corner turn in which would be a little unsettling to me, that is my preference.