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Pertinent Conclusions of the Report with more questions
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Posted by David G. Mills (more from David G. Mills) on Thu, 7 Jun 2001 19:03:04 Share Post by Email
In Reply to: Re: Ford Explorer Woes (Need 2 Slow's expert opinion, among others), 2Slow, Thu, 7 Jun 2001 13:57:44
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Here's what the Firestone expert (PhD Ohio State) said in his conclusions:



"The standard method of measuring understeer/oversteer gradient establishes that the Explorer, with four good tires, has a relatively small amount of understeer compared to other SUV's -- less than half the amount found in the Blazer and Cherokee. In fact, the Cherokee has about the smae understeer with a detreaded tire as the Explorer with four good tires.

"The test results show that, unlike the other SUV's tested, the Explorer loses its small amount of understeer when it experiences a tread separation and becomes an oversteer vehicle.

"This is true whether the Explorer is operated on Goodyear OE tires recommended by Ford or on Firestone OE tires.

"The Explorer's oversteer characteristic is worse in the loaded condition.



Not surprisingly Firestone concludes the the Explorer has a serious safety defect that warrants a recall.

Here are my questions:

1. Is there any agreement between engineers as to what constitutes neutral steering? Is there some objective standard, say mathematical, whereby someone can clearly say above or below this certain number it is understeer and above or below this certain number it is oversteer? I ask this question because what is oversteer to you might be understeer to Coolknight.

2. Can Firestone really prove that going from understeer to oversteer really is as dangerous as this opinion suggests?

3. I have always read that understeer is bad but Firestone suggsts that it is not. When is it good and when is it bad?

4. How would you characterize the 9-5's understeer/oversteer gradient?


Much obliged for the insight.

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