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| FORDom |
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Hey guys, just a bit of advice on rim sizes when drag racing, what is best?
i have 19"s and last time i raced in them i got poor times.. should i go 15's all round or will i get away with 19's on the front and 15's on the rear? |
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| Froudey |
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FORDom wrote: Hey guys, just a bit of advice on rim sizes when drag racing, what is best? i have 19"s and last time i raced in them i got poor times.. should i go 15's all round or will i get away with 19's on the front and 15's on the rear? if you could get some 17's that would be an ideal size.
_________________ R.I.P Tobias my son. |
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| TROYMAN |
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you could go with wide low profile 15" tyres to get your tyre diameter smaller/ slightly faster launches off the mark..
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| Steady ED |
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why were the times poor, no traction?
if traction wasn't an issue they only way you'll improve is with ligher wheel/tyres...
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| low_ryda |
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it's a gearing issue, your gears don't stop at the diff... hehe
increasing the diameter of your wheels will increase your top speed for the cost of acceleration, and smaller wheels will achieve faster acceleration at the cost of top speed. thats why v8 supercars still run 17's and not blingin' 20's. thats why cars with 20's drive you more than you drive them lol and lighter wheels will work like a lightened flywheel (less rotating mass/inertia) theres an equation that compares lightening wheels to reducing body weight and it's something like 3 times more effective by memory. if that makes sense..... heh
_________________ Not to get technical, but according to chemistry alcohol is a solution. |
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| ebxr82nv |
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What sort of tyres do you intend on running? Full street, soft street, semi slick or drag radial? That should be the first thing to work out then go looking for rims to suit.
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| Steady ED |
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low_ryda wrote: it's a gearing issue, your gears don't stop at the diff... hehe increasing the diameter of your wheels will increase your top speed for the cost of acceleration, and smaller wheels will achieve faster acceleration at the cost of top speed. only if overall rolling diameter changes.
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| ebxr82nv |
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Steady ED wrote: low_ryda wrote: it's a gearing issue, your gears don't stop at the diff... hehe increasing the diameter of your wheels will increase your top speed for the cost of acceleration, and smaller wheels will achieve faster acceleration at the cost of top speed. only if overall rolling diameter changes. With 19s on an e series I'd be suprised if it didn't. The 20s I've got for my au are an inch taller than the standard wheels. Works out to be roughly 8-10%.
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| Steady ED |
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about as much difference as running with brand new tyres vs worn tyres
 my point was, saying that 'gearing' is changed by changing wheel size is wrong, it's changing the rolling diameter that does it.
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| ebxr82nv |
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Steady ED wrote: about as much difference as running with brand new tyres vs worn tyres my point was, saying that 'gearing' is changed by changing wheel size is wrong, it's changing the rolling diameter that does it. they're only car tyres not 35" muddies. The tread isn't that deep.
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| Steady ED |
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no s**t sherlock, i'm saying the difference in rolling diameter is sfa between 205/65 15s and 245/35 19s.
_________________ ED XR8 Sprint - S-Trim, V500, 249rwkw |
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| ebxr82nv |
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Steady ED wrote: no s**t sherlock, i'm saying the difference in rolling diameter is sfa between 205/65 15s and 245/35 19s. I don't care much for your attitude. 
_________________ 9/98 AU1 XR6hp-about to retire from the road and be reborn on the race track. |
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| TROYMAN |
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Steady ED wrote: no s**t sherlock, i'm saying the difference in rolling diameter is sfa between 205/65 15s and 245/35 19s. but if you drop profile to 50 series 15" it could help! but not as much as changin the diff ratio.. |
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| krisisdog |
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ebxr82nv wrote: Steady ED wrote: low_ryda wrote: it's a gearing issue, your gears don't stop at the diff... hehe increasing the diameter of your wheels will increase your top speed for the cost of acceleration, and smaller wheels will achieve faster acceleration at the cost of top speed. only if overall rolling diameter changes. With 19s on an e series I'd be suprised if it didn't. The 20s I've got for my au are an inch taller than the standard wheels. Works out to be roughly 8-10%. Be surprised then. 205/65/15 = 2034.2mm circumference 235/35/19 = 2032.9mm circumference Thats 0.1% difference. 235/30/20 = 2038.9mm circumference Thats 0.2% difference. It really really really helps when you get the right size tyre fitted. Even if you use 245s the difference is still 1% for 19s and 1.2% for 20s. |
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| big dell |
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but with 20'z you only get a very small contact patch and very little side wall flex.
so putting 20'z on fro racing is not the best bet. for drag racing get some M/T street slicks or what every they are called in 15's. |
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