L22DC4Cab

I will give 40f/38r a try in an effort to reduce understeer. I want to be careful not to induce sudden oversteer and have the rear step out on me violently.

David in LA

Depending on the conditions of your local freeways, 40 lbs in the front will induce tramlining and will also make your steering nervous. I prefer 36/38 or 37/39; I prefer the latter a bit more as I run 18" rims and surface quality of the streets in LA have become really bad.

Also unless you are tracking or racing the car IMHO you are better off NOT trying to adjust the understeer/oversteer through tire air pressures. If looking for a cost effective was to reduce understeer you should drill the rear sway bar and stiffen it. IMHO of course

STLPCA

My MXX3 experience was much different. I ran 17" MXX3 for 2 yrs on the street (at 32/34) & then for 2 yrs as my DE track tires before moving to MPSC. I found the MXX3 to be very predictable, easy to read & throttle steer, w/plenty of audible warning as they gradually let go. They shouted as they approached their limit. The MPSC (as w/most R tires) OTOH, make barely a wimper until you're sideways. It took me 2 HWFMR spins to figure out the difference

Edward

Hi L22,

Just my opinion, but I don't think 40f/38r is going to do much for reducing understeer on the street. 36psi is what's rcommended for 17"cups, and I'd stick with that, or perhaps drop the rear by 2-3 psi, but I wouldn't go higher than 36. Tires are meant to operate under specific design parameters. Deviate + or - by too much and at best, your handling suffers; at worst, your tires fail and you go bye bye. Ultimately, you really can't address understeer issue with just adjusting tire pressures, sorry! When one is already within the tires' proper inflation range, fiddling with air pressure, especially for a street-driven car, just isn't going to yield much improvement in handling, and can even result in, ahem, less-than-desirable results.

The best way to address your understeer is first, go to 225/45 fronts, as was already mentioned. This makes a considerable difference. Then you can go to bigger swaybars --there's a host of them out there, but the most cost-effective fix is M030 swaybars, 22mm/20mm, IMHO.

And also remember that BOTH understeer or oversteer can be induced in most cars, depending on driver input...just a reminder.

Edward