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Originally Posted by stephen wilson
Would these pressures be adviseable on the street? I'd like to reduce the understeer, though some is due to the rear weight bias, which gives great rear grip. In tight turns (on the street), I tend to hit the throttle to soon, causing power-on understeer.
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yes this will also work on the street. the understeer is due more to factory setup than to the rear weight bias.
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Originally Posted by stephen wilson
I also think Porsche did TOO good of a job in eliminating trailing throttle oversteer. I'd like the car to rotate more with a throttle lift, for mid-corner corrections. I've never driven a car so stable off the gas and trail-braking, even with the PSM off. (MY06) I find the PSM very intrusive if I'm trying to have fun, it kicks in way too early. But, it's great for joe blow, or if you're not paying attention, you couldn't spin the car if you tried!
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again, this is due to a large extent to porsche's OEM setup. understeer is SAFE for road cars because, to the untrained driver, it is a self-correcting phenomenon. the instinct is to lift off the gas & this solves the problem. oversteer, on the other hand, requires a trained response. porsche spent a long time trying to engineer turn-in on throttle lift for road cars. we can, of course, add this feature with a few mods. by FAR the most bang for the buck here is a rear sway bar upgrade. simply swapping to the BASE model's M030 sway bar makes a HUGE difference.
with the right setup, a mid-engined car will rotate like a top; all the mass from the motor/tranny is right at the center of the car. this means VERY short polar moments of inertia. this can be a blessing.....and a curse.
another reason the car is tough to rotate with power ON is because it lacks a limited slip diff. right about the time the car is putting down enough power to cause power-on OS, the inside tire will spin.
i have experimented EXTENSIVELY with various isolated & incremental mods to the 986. if anyone has questions about how different things WILL effect handling (NOT are likely to, WILL) on this car, fire away. i have tried all KINDS of stuff, street & track. i have logged data to back a lot of it up.