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MR2 Oversteer FAQ

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MR2 Oversteer FAQ MR2 Oversteer Description The MR2, being a mid-engine car, has handling characteristics which differ from most. Oversteer, the tendancy for the back tires to lose traction during a hard turn, can result in the back end suddenly becoming the front. As the center of this discussion, we will not label the *oversteer tendancy* a "problem", indeed, used properly it is a valuable characteristic. Rather, the substance of this discussion is the tendancy towards oversteer in the 91-92 MR2 as compared with the 93-95 and whether the MR2 is 'tail happy'. [Ed. - I suggest all posters to the MR2 digest avoid the term 'tail happy' lest you are asbestos coated!] It should be noted that neither the early nor late Mk2 has an oversteering tendancy in normal use. The rest of this missive will be aimed at extreme driving; the edge of the envelope. The Basics In extreme cornering, as in all, the momentum and weight of the car shift entering a corner, allowing the outside tires to increase their grip on the road which enables the car to drive with the curve. In the best circumstance the driver will neither accelerate or brake while in the corner preserving the momentum and weight characteristics. If, however, the driver slows or brakes within the corner, the momentum characteristics will change and the weight of the car will shift towards the front resulting in traction loss in the back tires. If the shift is drastic enough, the rear tires suffer a catastrophic loss of grip and the back end of the car will break loose. There are other instances that will cause oversteer also, for instance, going over a large bump while in a hard turn or having to suddenly slow in a corner because of an upcoming accident - basically anything that results in a drastic change of weight will almost invariably spin an MR2. Of course this could happen in *any* car, the *degree* of the tendancy to oversteer is the point of examination. The MR2 The 91-92 year MR2 has a different rear suspension geometry as compared with the 93-95. It is true that the change in geometry was intended to reduce the tendancy to oversteer and most would agree that the modification does just that. The hotly debated topic is whether the 91 MR2 has a "problem" with oversteer. I'm not sure that there is one answer to this question. so best to enlist the comments of those who know. Abridged comments from the digest are below: " With an *experienced* driver the '91 has better holding capabilities. With its shorter (trailing) arms, the car is VERY responsive to all movements; it is ADVANTAGEOUS to have control over the rear-end. In corners the '91 holds harder than a comparably configured '93 suspension *if* you maintain your speed. Let up (on the gas pedal) once and the tail will wake you up and tap you on the shoulder. My feelings with the '93 is that for the general public the suspension changes were an improvement. SCCA drivers typically drive the '91-92 models if they have a choice. I feel Toyota made the (91) car to fit the vision of a production racer. Realizing the general public needs saftey built into their cars (because they aren't competent enough drivers) Toyota made the suspension changes. " - Pete Feret (91T and 93T) " Yes, the rear suspension of the 91-92 is somewhat quirky for the uninitiated, but anybody with a strong familiartiy of rear wheel drive and power induced oversteer will relish in the enhanced 'point and shoot' driveability of the car. (Very quick through a slalom with the right rhythm.) The nay-sayers of the 91-92 MR2 have never really driven one hard. It requires a special finesse that rewards a skilled driver. " - Kip Anderson Regarding the uninitiated driver or those who drives the limits but prefer predictability: " If you like driving the car at the limits you may want (a 93+ or modified 91 which is more like a 93+) because it is a bit more predictable and forgiving. That is not to say, the 91-92 suspension is not predictable, but rather the time from rear end breakaway notification to actual breakaway is a little longer for 93-95." -Jeffrey HoSee (91T) [End comments] So, the choice between a 91 and 93 with regards to oversteer is a personal one. If you can master the characteristics of weight, momentum, and cornering then possibly the 91 is for you. If you are unsure or want a more predictable oversteer response, then a 93+ (or modofied 91) would probably be a good choice. Overall, one should remember that *both* cars have a tendancy towards oversteer. The degree of that tendancy is the difference between the two years. In either case, one mistake during extreme cornering may have dire consequences. rev A

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