When I try to do a 0-60 in an I-series with a modded engine, the car soon spins out of control because the engine sometimes delivers more power to one axle than another. This only happens when I use the RWD layout. Or may be it is normal for a 350+ hp engine? I've made a video of it. In the video it is compared to an SBR4 that, despite having RWD and similar amount of horsepower, doesn't spin out of control at all. I DID NOT STEER BOTH CARS WHEN FILMING THE VIDEO.
Considering that the ETK is front engined (less weight over the rear which means less traction) whereas the SBR4 has a big heavy engine right over the rear axle, has thinner and harder tires than the SBR4, and is easily 20 years older than the SBR4 this seems perfectly reallistic. Also the ETK has an open differential, which means torque is always split 50-50 between the two wheels. What this means is when one wheel has more grip than the other, the wheel with less grip will receive more power, as it becomes easier to move.
