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Title: Online gearbox ratio calculators Post by: Andy Sykes on July 07, 2013, 19:58:47 pm Hi guys I'm trying to get some idea of ratios but I can't find a website that show RPM as well as MPH I did find one the other week but seems to have vanished when I found out my 930 box was a paperweight.
So far I've come up with this Tyre 26 Rpm 8k 1st 2.91 2nd 1.93 3rd 1.26 4th .96 FD 4.13 1st 51mph 2nd 82mph 3rd 119 mph 4th 156 mph Cheers andy Title: Re: Online gearbox ratio calculators Post by: richie on July 07, 2013, 20:02:03 pm John Maher's site has some good calcs, here's the gearbox one
http://johnmaherracing.com/calculators/gear-ratio-calculator/ Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 07, 2013, 20:02:54 pm Cheers it won't work on my feckin iPad lol
Title: Re: Online gearbox ratio calculators Post by: richie on July 07, 2013, 21:32:35 pm Oh and just to confuse the calcs, a 26inch tyre grows by 1 1/2 inches at 150mph in tests by Mickey thompson
Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 07, 2013, 21:45:05 pm If I can get 150 I'm getting there lol
Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 07, 2013, 22:27:54 pm This is the 930 info as you can see WAY out
(http://i71.photobucket.com/albums/i149/gluemixer/garys%20picnic%202010/null_zpscc8c47b2.jpg) (http://s71.photobucket.com/user/gluemixer/media/garys%20picnic%202010/null_zpscc8c47b2.jpg.html) Title: Re: Online gearbox ratio calculators Post by: richie on July 08, 2013, 06:41:19 am Especially as that tyre calculates to 24.68 inches tall, put a 26inch tyre on there and that is stupid tall for a drag car ::)
Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 08, 2013, 10:38:14 am another try with rpm
Diameter of wheel and tyre 66.0cm Gear Ratios Overall Ratios First 2.910 12.018 Second 1.930 7.971 Third 1.260 5.204 Fourth 0.960 3.965 RPM 8000 Diff Ratio Gear Ratio KPH per RPM KPH 1000 RPM 4.130 2.910 10.4 0 0 8000 83 1.930 15.6 5306 83 8000 125 1.260 23.9 5223 125 8000 191 0.960 31.4 6095 191 8000 251 Title: Re: Online gearbox ratio calculators Post by: paul_f on July 09, 2013, 10:57:32 am Can you not get new ratios for the 930 box, or are the prices ridiculous?
Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 09, 2013, 11:03:27 am Hi you can get other ratios but they are not close enough and it feels all to much like and experiment lol
Title: Re: Online gearbox ratio calculators Post by: Fiatdude on July 09, 2013, 11:50:05 am Sounds like a simple case of needing more Horse Power
Wish you were on this side of the pond and I'd be glad to take it off your hands Title: Re: Online gearbox ratio calculators Post by: Andy Sykes on July 09, 2013, 13:16:51 pm I don't think power is the issue its being off boost that's the problem I should be about 1100 bhp when done and I wont be spooling till 5.5k if I had a 3 mile track then I would use it lol
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