Quote:
Originally Posted by joe88911
Bill:
I've got a stock 88 3.2 Targa i'm autocrossing a little. I'm really new to any actual performance driving. The car seems to push pretty bad but i've also spun it a couple of times (on lift).
All my bars have wear from metal/metal contact and/or corrosion so I have to replace them all. I'm doing all the bushings while I'm in there. I'm thinking 20/27 and will run 205/225 200 tread wear tires on the 16" Fuchs when I get it all together before spring. I have Bilsteins, now.
I also do a lot or pleasure drives so having it not too harsh would also be good. This is why I thought 20 up front.
What do you think? Will it have too much bias toward oversteer?
Thanks
Joe
PS: you are my favorite in all the forums. You seem to back up all your contributions with data. I like that!!
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Never driven a 911 that couldn't be made to snap spin, if you lift at the wrong time
and yes a stock 911 will understeer most of the time, this tendency is speed related, the faster you go the less evident. It is related to weight transfer and aero, so you drive to put weight where you want grip, gas on the straights, brake in a straight line w/ a little trailing throttle on the transition to turning,
tires are huge, they are you only contact w/ the rest of the universe, 205/55 on 6 and 225/50 on 7 is a very poor choice for performance
if staying w/ 16" Fuchs I'd want 7 & 8 205/50 & 225/45 min
the suspension choices are made to keep geometry changes related to suspension travel to a minimum, stiff suspension and geometry changes to suspension both kill grip, snap spin comes from the sudden transfer of weight from the rear + suspension geometry changes where camber and toe revert to less grippy realms.
for A/X you want more over/less under than for street or track purposes.
Here's an array of street oriented t-bars
𐤃 f/r is the best indicator of basic over under, higher numerical is more under lower numerical is more over(red)
18.8/27 is the most A/X oriented but would likely be too far for regular street use, 20/24 is the most under and most drivers would hate it. choice of bars is related to choice of wheels, tires and suspension setup
if I wanted to A/X but also use the car normally I'd probably go 20/27 w/ your stock sways
I'd also lower the car a lot , raise the spindles, lower the steering knuckles, use digressive Bilsteins(Vonn)