I decided to go back to green rears and brown fronts and try everything I could to resolve the roll issue without increasing damping and the rear becoming loose too easily on corner entry. On a high bite track, it was great, but as the traction surplus went away, I was at a disadvantage compared to my old setup. It was a decent setup, but it was a bit loose, and a bit pushy. I tried a few rear spring and front spring combinations and settled on green rears and black fronts, which allowed me to get roll centers working, but the car was just less capable than my old v2 setup and felt like it was lacking front/rear weight transfer due to the stiffer springs required to tame roll. ![]() In my testing and tuning, I determined that at 24mm ride height, even with a shaved u-brace w/ no washers and the a-hubs, which offer a higher roll center than the c-hubs, I could not keep the rear from rolling too much and washing out in the rear at times, especially when coming out of corners.Ĭhasing the front and rear with stiffer springs This is immediately apparent when you try to run brown front springs and black rear springs, basically the old shock spring rates (old rear green = new rear black). The lighter damping causes the car to roll quite a bit more than with the old shock setups. It is my opinion that the 1.6s are the right piston choice, really bringing the benefit of big bores home. You can run the 1.7s with thicker oil and get basically the same regular damping speed and pack as the old small bore shocks, but then what's the point of going to big bores if you can't get more pack for big jumps paired with lighter initial damping to float over bumps better. If you go up a half weight in oil, the 1.6 have more damping than the old shocks period, both normal damping and pack. You can see this yourself by bolting an old and new shock together at the eyelet and just playing with them. The big bores with 1.6 pistons and the same weight oil have less damping but more pack when compared to the old shocks. ![]() I feel that many of the stiffer spring setups are stable but not as capable due to less front/rear weight transfer and that the 1.6 pistons deliver the most benefit of moving to a bigger bore shock. The goal of this setup is specifically to stay on the 1.6 pistons and reasonably light (especially front) springs. ![]() This setup uses softer springs than the common 'team' setups and instead relies on roll center modifications to counter act the lighter initial damping of the 1.6 pistons. This is the result of testing and tuning on my b4.1 worlds with big bores for the past few weeks. Team Associated B4.1 - Wayne Schroeder - Fastlane Raceway.
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