The ever problematic Stealth is finally getting sorted out, and behaving as a real race car should. The alignment, corner weight, and wing changes has really settled down the car. Racing the car in December of 2010 at Phoenix was a real pleasure. The car stuck well, was very neutral, and kept up with everyone in the corners.
The weekend started off with the back end stuck like glue, and there was the ability to experience some driver induced understeer. Unfortunately it was near impossible to rotate the back end around it stuck so well. This resulted in taking some wing out of the car. Understeer was reduced slightly and the back end just started to rotate around. Ideally I would like to have the back end a little more loose, but in the corners the car was holding its own very well.
The newest problem this weekend was twofold: clutch and weight.
As some of you fans know the car is heavy… 200+ lbs heavier than its competitors. With it being heavy and a motorcycle power plant, that motorcycle clutch gets a beating. The clutch continued to slip when trying to put power down. Every shift resulted in cars walking away, and it was very frustrating especially when I caught up to some of them at turn 1, and they only got away at shift points. The first day I just sucked it up and limped the car around the track.
At the end of day1 the clutch was taken apart and measured for wear. The friction plates we within spec (barely), and my spares on hand were no better. With those measurements, it was either marginally bad plates or the stock clutch spring couldn’t handle the weight of the car combined with the newfound request to drive hard(now that the car handles). The next stage is to disassemble the clutch in the shop, do some more precise measurements and upgrade the necessary weak components. Weight reduction is also being looked at, however here at PitMonkeyRacing safety is #1, so we are very careful before removing any metal.
To end the story, even with a slipping clutch lap times were reduced by almost 5 seconds a lap. Had the clutch not been slipping all the way around the oval, and at the exit of every turn it would have easily been 5 seconds a lap faster than before.
Unfortunately my benchmark of PIR is no more (see other story), so I wont have my old measuring stick any more as a guideline.