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Old 05-21-2005, 07:28 PM
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new tires slowing me down?

hey guys, i just got new 275/60/15's put on the back of my 76 el camino. before i got these i was running on basically bald tires of the same size. i went to the strip again and was running about .15 secs slower than normal. can the difference in height between a bald tire and a new tire make this much difference? also, does anyone know what the optimum tire size would be for this car with a 3.73 locker rear end and a th350c trans?
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Old 05-21-2005, 07:38 PM
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Do you notice anymore tires spin then you did before?

Chris
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Old 05-21-2005, 09:01 PM
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With the 3.73 gears, approx. 26" to 27" tall tires would give you the best performance in the 1/4 mile unless you are running 110 m.p.h.+ at the big end. I doubt that the new tires are the only variable that caused .15 slower E.T.'s, unless (as Chris stated) the new rubber isn't hooking up as good as the old tires. You should be able to compare 60 ft. times. We have varied nearly that much from week to week just going from good weather conditions to crappy air the next.
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Old 05-21-2005, 09:08 PM
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Thats true times to change esp. the 60 foot I was just thinking that maybe that new rubber was spinning a little too much. It could be that you have to get used to the new tires they may have to be a little hotter then your others did. Even within the same type of tires and brand tire tread will change even the rubber.

How many times have you taken it to the track?
Anything else could ahve changed such as track temp.

Chris
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Old 05-22-2005, 12:06 PM
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there was a little slippage from the line on my first run, but after that they seemed to hook up just as well. the weather when i ran last time was overcast. it had been a muggy day and threating to rain all day
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Old 05-22-2005, 12:12 PM
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Track conditions do effect time slips. It might have been the track was cooler and tires did not bite as hard as they otherwise would have on a hotter sticker track. See how it runs after a few visits to the track and if nothing else changed you should get back up there.

Chris
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