Will slicks and steeper gears cause lower dyno numbers
01-21-2008, 06:17 PM
#1
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Will slicks and steeper gears cause lower dyno numbers Like the title states, I would like to know if running slicks vs drag radials or street tires on the dyno would cause lower numbers.
The same question applies for gears, would the same car with 3.55s dyno a little higher than it would with 3.73s(or 3.23s vs 4.10s for a larger spread)?
The same question applies for gears, would the same car with 3.55s dyno a little higher than it would with 3.73s(or 3.23s vs 4.10s for a larger spread)?
01-22-2008, 12:49 PM
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01-22-2008, 12:52 PM
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Shorter gears (4.10) will yield lower numbers because of more friction since they turn more for the same speed.
The slicks have more rolling resistance than a radial, so that will also lower numbers.
The slicks have more rolling resistance than a radial, so that will also lower numbers.
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01-23-2008, 09:14 AM
#10
The gearing will cost a bit on the dyno, but not much. The physical size of the rear means alot. Bigger gear set, bigger axles, as in Ford 9 compared to factory 10 bolt, that will eat more than just a 4.10 in place of a 3.42 in a factory 10 bolt.
01-23-2008, 11:03 AM
#11
They dont. Slicks are lighter than a radial. And the rims are usually lighter too.
The gearing will cost a bit on the dyno, but not much. The physical size of the rear means alot. Bigger gear set, bigger axles, as in Ford 9 compared to factory 10 bolt, that will eat more than just a 4.10 in place of a 3.42 in a factory 10 bolt.
The gearing will cost a bit on the dyno, but not much. The physical size of the rear means alot. Bigger gear set, bigger axles, as in Ford 9 compared to factory 10 bolt, that will eat more than just a 4.10 in place of a 3.42 in a factory 10 bolt.
Much, much lighter in most instances.
01-23-2008, 12:55 PM
#12
They dont. Slicks are lighter than a radial. And the rims are usually lighter too.
The gearing will cost a bit on the dyno, but not much. The physical size of the rear means alot. Bigger gear set, bigger axles, as in Ford 9 compared to factory 10 bolt, that will eat more than just a 4.10 in place of a 3.42 in a factory 10 bolt.
The gearing will cost a bit on the dyno, but not much. The physical size of the rear means alot. Bigger gear set, bigger axles, as in Ford 9 compared to factory 10 bolt, that will eat more than just a 4.10 in place of a 3.42 in a factory 10 bolt.
01-23-2008, 01:47 PM
#13
I agree. ^^^. Now wouldn't slicks or drag radials have more rolling resistance due to being at lower PSI? Figure a 16-17" rim with the same exact tire. One being at 14psi...and say the other at normal street pressure like 32psi. Would there be a difference in dyno numbers or would the difference be negligable?
01-24-2008, 12:38 AM
#14
I've always heard slicks weigh more. I haven't weighed them or anything or ever owned any slicks. Just hear say. It makes sense though they are solid instead of having tread cut out.
