| kim0663 |
MR2 Semi-Demi God
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Posts: 1672
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Joined: 04 May 2006
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Location: Auckland
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Posted: Thu May 01, 2008 3:02 am
Post subject: gen1 and gen2 differences
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was browsing mr2.com and found this.
a good read if your unsure of the differences in gens.
| JIMKING wrote: |
Here's the straight dope:
Neither car is going to spin when driving straight down the road (duh!), but if you are rounding a corner near the limit and have to lift / brake or THE CORNER SUDDENDLY GET SHARER UNEXPECTELY, then the 91-92 is much more likely to swap ends suddenly on you.
In stock form, the 91-92 cars do this for two reasons:
1) Tire sizes: The 91-92 cars come with 195/60-14 on 6" wide rims front and 205/60-14 rear on 7" wide rims rear. The 93+ cars went to 15" rims of the same width, but have 195/55-15 front and 225/50-15 rear tires. More rear grip = less likely to spin.
2) Rear suspension geometry: The 91-92 rear suspension geometry is designed to TOE-OUT under lift throttle / braking. In the hands of an experienced driver on a race track, this helps the car rotate on entry to a turn as you ease off the brakes and begin turning in. On a race track where you know every turn and have good visibilily this is great. In the real world with surprises and turns that aren't quite what you expect this can be disasterous if you are driving fast.
The 93+ rear suspension, due to the longer rear toe-control links, TOES-IN slightely under lift throttle / braking. This means turn-in is not as "crisp" as the 91-92 cars, but the car is much more amenable to mid-turn corrections, even braking. Braking mid-turn in a 93+ car will still cause the rear to lighten up and in extreme cases to start slding/spinning, but a good driver can recover with some opposite lock steering. In the same situation with the 91-92 cars, the toe-out that happens literally kicks the rear of the car towards the outside of the turn, making the spin happen much, much more quickly.
Using a much larger front/rear tire width stagger on the 91-92 cars (eg: 205 front / 245 rear) helps make it harder to spin by increasing rear grip, but the overall geometry problem (or feature, depending on how you look at it) is still there. |
from http://www.mr2.com/forums/mk-2-mr2/Toyota-MR2-7656-1991-suspension-v-s-1993-suspension-usa-car.html
_________________
You Joon Kim
1992 Mr2 GT-S
1991 Soarer
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