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| mrnasty |
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gday,
Is there a formula for working out top speed in each gear with a given gear ratio and diff ratio? basically im trying to work out my top speed in first gear with an EA T5 and 3.73:1 diff gears, with 15" rims and 205*65*15 tyres. cheers
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| Disco Frank |
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umm you can
get the circumfrence of each wheel the max rpm of engine and all the ratio's of gears and away u go 
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| mrnasty |
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yeah but what is the actual equation???
oh and does anyone have the ratio for first gear in an EA T5??
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| snap0964 |
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Disco Frank wrote: umm you can
get the circumfrence of each wheel the max rpm of engine and all the ratio's of gears and away u go . . . . . and then put them in a spreadsheet to make it easier. Edit what you need in the yellow cells, and then click on a vacant cell for your figures. Bear in mind this calculates rolling speeds, obviously speed limiters come into as well.
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| Steady ED |
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EA 1st is 3.5 from memory.
With 3.73's it'll be off tap dude, f**k burnout machine!
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| MikGan |
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yeah back in the day I wrote my first flash application, http://users.bigpond.net.au/mikgan/flash/carcalc.swf and I think its got them values in there somewhere..
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| MikGan |
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I only got the auto ratio in there 2.39, ahh well, was a while ago that thing...
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| mrnasty |
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thanks for that,
judging buy that snap, my top speed will be 51 km/h at 5500rpm in first gear.... doesnt sound right considering ARM said that an EA T5 redlines at bout 40km/h with a 3.45 diff...?
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| snap0964 |
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mrnasty wrote: judging buy that snap, my top speed will be 51 km/h at 5500rpm in first gear....doesnt sound right considering ARM said that an EA T5 redlines at bout 40km/h with a 3.45 diff...? I think you'll find it's reasonably close - my XH calculated 105kmh in 5th at 2000RPM - this is spot on in reality.
I did measure my wheel diameter, and compared with the spreadsheet, the diff is around 12mm less in calculation - rolling distance will calculate on the conservative side. Also I suppose the actual rolling distance will be slightly less due to the tyre sitting flat due to tyre pressure.
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| Andrew J |
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doesnt matter how flat they tyre is it will still be the same distance all around the tyre. Dont forget about torque converter slip in the autos either.
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| snap0964 |
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Andrew J wrote: doesnt matter how flat they tyre is it will still be the same distance all around the tyre. an example from http://www.southmainauto.com/tires.htm . "Rolling Circumference = The linear distance traveled by a tyre in one revolution. This can vary with load and inflation."
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| mrnasty |
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thats just made my day
mint. Thanks dude!
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| mrnasty |
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well its a goer. Pick the gearbox up tomorrow night, and then i have to collect a few more EF specific parts and a new clutch over the next month or two.
mint
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| MikGan |
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nice work!
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