PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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first off, I cant find the info with th gear ratios forthe F15 box in my GSi...
also what calculation do I use to work out the speed of the car from the RPM & tyre/wheel dimensions??
tried searching thenet, cant find shit 
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John
Member
Registered: 30th Jun 03
User status: Offline
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http://www.smokemup.com/auto_math/mph_range2.php
Any help?
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ed
Member
Registered: 10th Sep 03
User status: Offline
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Doesn't have the right gearboxes
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Paul_J
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Registered: 6th Jun 02
Location: London
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Thing is - The reason speedo's are out at high speeds is because the tyres expand. thus making the rolling diameter different.
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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hmmmm my speedo seems to be pretty accurate then... worked these out & compared to what it was reading earlier on the motorway...
code:
Wheel rim size 14 Tyre section 185 Aspect ratio 65
Enter diff ratio 3.74 Wheel diameter 23.468
Enter 1st gear ratio 3.73 Type 9 Standard ratios
Enter 2nd gear ratio 2.13
Enter 3rd gear ratio 1.41
Enter 4th gear ratio 1.12
Enter 5th gear ratio 0.89
Enter rev limit 6500 <- rev drop at ->
Limit <- change point ->
1000 2000 3000 4000 5000 6000 7000 8000 6500 500-600-700-800-650
1st (3.73 ) 5.0 10 15 20 25 30 35 40 33 285 342 399 456 371
2nd (2.13 ) 8.7 18 26 35 44 53 61 70 57 330 397 463 529 430
3rd (1.41 ) 13.2 26 40 53 66 79 93 106 86 397 476 556 635 516
4th (1.12 ) 16.6 33 50 67 83 100 117 133 108 397 476 556 635 516
5th (0.89 ) 20.9 42 63 84 105 126 147 168 136
Revs @ 60 mph in 4th 3599 Revs @ 70 mph in 4th 4199
Revs @ 60 mph in 5th 2860 Revs @ 70 mph in 5th 3337
[Edited on 07-01-2005 by PaulW]
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John
Member
Registered: 30th Jun 03
User status: Offline
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Site I posted was if you could find the gear ratios in the box you were wanting to do it for.
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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hummm according to that paul i should do 150ish mph
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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if u have an f15 Gearbox not a hope......
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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says 7000 rpm in 5th is 147mph, my limit is 7200. lol, i hit the limiter in 5th and its doing about 140 on the clock........ i say abotu as my clocks only go to 130.....
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Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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i havent hit my limiter in fifth yet.... i got afraid at 115 
have u fitted your TB's yet?
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Greasemonkey
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Registered: 17th Apr 02
Location: Drives a Tractor
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Dont be afraid to nail it man, ya gotta at least take it to above the standard top speed of 121 on a private track of course
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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u have to remember that my corsa is the merit model... it was only ment for carrying grannys to the shops.... although granted there not alot of the orignal car left....
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lee mitchell
Member
Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
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my gsi pulls 135 mph thats at about 6500-6750
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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lee.....does a unchip make any difference up to the gears? torque? or does it just add bhp?
i have a manztel but still on OE ecu.
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
User status: Offline
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quote:
Originally posted by Greasemonkey
Dont be afraid to nail it man, ya gotta at least take it to above the standard top speed of 121 on a private track of course
private road last night, ~6300rpm - speedo indicating just slightly over 130... didnt haver any more go in it tho as the engine dies out just after ~6300 & looses power
thats why was asking about ratios & such, but i found a program which will work out speeds & such to tyre/wheel size & ratios of gearbox... so my speedo seems pretty accurate then me thinks! worked it out seperate to 132.7mph @ 6300rpm
[Edited on 07-01-2005 by PaulW]
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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jesus christ your engine must have been screaming!?? 5500 is the highest id had mine in fifth..... 120 on the clock so i say 115.....
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PaulW
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Registered: 26th Jan 03
Location: Atherton, Greater Manchester
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was a bit loud
still, the maths add up & also got one of the maths teachers where i work to confirm it & he said exactly the same!
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lee mitchell
Member
Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
User status: Offline
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tested mine last nite around 105 at 5k at 135 its about 6750
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