Recent content by dsgerbc

Idk, I did measure geometric motion ratios crudely around stock ride height and got 0.63/0.6 front/rear. Those numbers roughly matched what I got from lower arm hole ratios and coilover inclination angles. MPP/RW claims I've seen are generally about the spring perch offset <-> amount of...

@gearchruncher measured the front one much closer to 0.6.

I'm gonna quote this reply in this topic, cause it's more relevant here. I seem to recall calculations just a few pages ago in this topic that suggested 900+ front rate just to get to 2hz. Did you perhaps re-measure the motion ratios or unsprung weights more accurately? Thanks

I think it could be camber. -3.5 degrees is too much for autox IMO, especially with more caster. I had tons of inner wear on 295 and 305-wide tires. I'm probably dialing it down to start the season.

Tirerack also did the same test in 2022 and ended up with the 225->245 change yielding slightly slower laps in the dry. In the 2023 test linked above, the 225->245 move resulted in a hair faster time...

TBH, if one were to invest tons of time/effort/$$ into research/testing to squeeze the extra 0.1s out of tires, it may still be worth it instead to invest the same resources into seat time/driver education for likely higher payoff. Unless one is already an alien-level autoxer. Tire testing is...

Extrapolating between different cars is pretty hard. Our wheels/tires are not 40% larger than 17"/25-ish inch rolling diameter tire on the Tirerack's BRZ. There's only one way to tell - test it on the car you intend to run. Anything else is just guessing. I would also take Tirerack's results...

Would not recommend in a state where it rains more than a few times per year. It gets quite sketchy in the wet after only a bit of wear.

So, an AS Model3 did pretty well at the Texas tour. Thoughts? The courses looks to have a had a slow corner or two, but otherwise seemed pretty fast/flowing.

What's the difference?

Correction, I tried 10/11 setup. Redwood HPDE setup is 10/13k.

I have Redwood's shocks with 7/11 and 11/13 spring sets. I did actually try 11/11 and it was predictably somewhat more understeery, with little perceived benefit in putting the power down on autox courses. I think street comfort (at least on RW-tuned shocks) is largely a function of front springs.

Probably a question for the Autox thread. If you care more about HPDE times, then sure, your lap times will likely benefit from wider fender/tires/wheels. For autox, getting fenders takes you into XS, with a lot tougher PAX (which is driven by other faster cars in the class). If you care about...

So, the recent Fastrack has a 'clarification' on the toe arms + camber arms. Appears to say that just one arm allowed...

Why are people happy about the adjustable suspension? Short of a well-tuned magneride (which Tesla won't install), it's probably not gonna be too useful, will carry extra weight, and make installing an aftermarket one marginally more involved. Even worse if it's an air suspension.