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The one thing that is throwing me for a loop with this is that the 60 ft times were quicker by .024 with the 23s than they were with the 29s with the 27.5s .005 quicker than the 29s! The car was really low in the front with the 23s and it does have an airdam so maybe that had something to do with it? The 1/8 mile times were .037 better with the 29s that with the 23s which I could see. As usual, any insight will be appreciated!
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Certainly. The 60' beams are significantly higher than the rest of the incrementals, so it's pretty easy to pick them up with a spoiler or air dam. The quicker incrementals at the other clocks with the taller tire are a result of the additional rollout. You can stage a car crooked and pick up ET (with a slower R/T). Might not want to do it with a fast wheelstander, though. ;-)
When I had 23" fronts on the Volare, I had a breakout run against Eberst: showed more stripe than what I took, picked up a little ET and MPH. What's tripping on a VOLARE?!? I crawled under the car and started measuring things... sure enough, there was a suspension piece on the driver's side that was juuuuust low enough to trip the finish when I lifted, at least with those lil' donuts on the front.
With the Turismo, the 60' times can be dramatically different from track to track, depending on how high they have them set up. At the finish line, the nose will go over the beams, but even just lifting is enough to drop the nose into the beam, picking it up .03 and 3 mph. At Pittsburgh, my 1/8th mile ET's were fine, but the MPH was wacky lane to lane, showing that it was tripping the MPH start beam with the nose in one lane, but the tire in the other lane. I run a stripe taker when bracket racing it, but can't in Stock, so I drop the nose at the stripe on every single run. Wanna slow down? Keep your foot in it! ;-) Kinda like driving a rear-steer firetruck. LOL Even with the tall tire, you'd better bounce the front end hard with someone watching underneath with a tape measure to see if it might trip under hard braking. Finish line is about 5-5/8". Likewise, you should always check your opponent's car for what's tripping where.
Remember you used to tell me about Rusty Canfield's Charger running the same ET but changing 3 mph depending on whether or not you had the rear spoiler on? That's very likely what you were seeing: just a matter of whether the nose was tripping this beam vs that beam (or not).