Unusual problem
Thread Starter
Joined: Sep 2004
Posts: 4,917
Likes: 909
From: Stockbridge GA
Unusual problem We dynoed my friend's vette with M/T DR's tonight, and couldn't keep the wheels from spinning on the Mustang rollers. The HP and Torque #'s were anything from 80-100HP lower than they were a few months ago. We noticed a lot of tire rubber splattering everywhere. We then swapped the rear wheels back to his Nitto street tires. This cured the wheelspin problems, and the dyno #'s were back to where they should be. I am just curious why the tires that hook better on asphalt won't hold on the dyno, and the tires that won't hook on the street stick to the rollers fine. This makes no ******* sense whatsoever to me. BTW, the best 60' on the nittos is 1.9 and the best on the M/T's is 1.6, so I know which tires hook better on the road.
TECH Enthusiast
Joined: Sep 2004
Posts: 564
Likes: 0
From: Omaha, NE
I'm assuming that this dyno had dual rollers for each tire as apposed to one huge 50" drum like our Mustang dyno. Smaller dual roller dynos create much more tire heat because each roller applies all of the force at small areas of the tire as apposed to distributing the force over a more wide tire patch. Any tire, such as your soft tire compound MTs, will lose traction when overheated, which they obviously were if you were throwing chunks of rubber around the place. So putting your hard rubber Nittos on kept your tire temps within an acceptable range, creating more traction.
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