Reply to "Directional Instability Topic (Split-Off from Sticky #7)"

bosswrenchMember

Renee- posted March 20, 2018 10:58 AM
'And we know where this instability comes from? Aerodynamics? Hence the big front and rear spoilers on GT3 and GT4?'

Off topic for this forum category, but there is some evidence hi-speed nervousness come from front end aero lift, just like GT-40s w/no front spoiler. The only known wind tunnel test published on a Pantera showed 136 lbs of frt lift @160mph while the GT-40 showed 120 lbs of front lift @ same speed. A 2 degree nose-down position seems to raise but not eliminate the speed at which the nervousness starts to get scary. Lack of enough front caster may contribute as well. SS runners say a rear spoiler/wing is needed for balance on Panteras above about 175 mph, maybe due to rear lift (only 20 lbs @160mph)

7/25/183:39 PM

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