205 Turbo (Gr.b) has a very BAD physics wheel clipping-through floor issue that's not shown in replay, only gameplay; seems the replay mode uses different physics..
How to reproduce: Install the mid turbo (721hp), use racing hard tyres, Drop the suspension, then take it to northern Isle, the car's right side wheels will bounce as it keeps clipping into the ground (tyre sidewall goes into the ground with the rims) , sending you into the wall or oversteering you as the "glitched suspension" will rebound you off your racing line.
Also, the Celica Grb car will always spin out on this track when driven by the AI, kind of funny to watch (do a group B race here). It's a smokeshow. Don't know if either bugs are new due to the 1.42 update but buggy nonetheless
for the clipping issue, Could be avoided by stiffening springs and ride hieght increase? But I haven't bothered to try that, it's a funny glitch. Either way, not realistic behaviour whatsoever to have a quarter of the wheel beneath the tarmac. If anything the car should spin out and slow down when forces are too great for the suspension or tyres to handle and wheel well contact should be simulated here.. the Tyres and rims should not clip into the ground to this extent.
EDIT: after more testing, replay is using a combination of different physics and/or animations
I raced then checked the replay of my race. Here's what I found:
- The wheel tucks into the body completely in replay mode, more suspension travel. and the car bottoms out, sparks fly
- However in gameplay mode the wheel does not tuck into the body as far (lack of suspension compression travel), the car does not bottom out, no sparks, the rear right wheel itself just clips a good 40 centimetres into the ground instead of compressing the suspension further like it should (as shown in replay).
- Either incorrect suspension animations used in gameplay, different physics simulation or a combination of the two between the replay and gameplay modes. Probably a combination and/or the frequency of the tire/wheel model physics simulation is lower than expected or volatile in this circumstance. Case closed. There was a similar clipping bug in GT6 and GT Sport, but it was for a different car, might have been the pontiac trans am, with front wheel clipping the ground IIRC.