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| Diff selection help? https://www.ausmini.com/forums/viewtopic.php?f=2&t=44172 |
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| Author: | smelly [ Thu Jul 24, 2008 2:30 pm ] |
| Post subject: | Diff selection help? |
I have orderd a new set of straight cut gear from the UK (Three months ago  and they are still on back order) I have been told that first gear is very tall so it may be a little hard to get off the line.
If any one runs straight cuts on the road what diff are you running to compensate for the tall first gear? |
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| Author: | slide [ Thu Jul 24, 2008 2:37 pm ] |
| Post subject: | |
I ran a factory sc/cr 3 synchro remote box in my Cooper S for years on the road, along with a 649, Browriggs and 45 Weber. I always used the 3.44:1 diff with no problems, and that was coping daily with Melbourne traffic. Gives you a great take off range before you need to change into second. |
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| Author: | albino235 [ Thu Jul 24, 2008 4:56 pm ] |
| Post subject: | |
I have a spread sheet I put together to illustrate gear ratios with diff ratios etc. pm me your email and I'll send it too you... |
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| Author: | DOZ [ Thu Jul 24, 2008 4:58 pm ] |
| Post subject: | |
I have a 3.44:1 and it's a biatch to drive on the street in traffic, not that I do that anymore... Daniel |
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| Author: | MINImal effort [ Thu Jul 24, 2008 9:52 pm ] |
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You can try this web site.... Has an online calculator just put in the various details (geraing, wheel size, diff ) and it'll show the data... http://www.guess-works.com/Gearbox/Technical/ratio.htm |
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| Author: | albino235 [ Sat Jul 26, 2008 2:47 pm ] |
| Post subject: | |
Mine is similar to that but I grabbed a dyno plot to show torque versus speed and the overlap in each gear 
It's not very accurate because each engine is different but its actually really interesting to mess around with... |
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| Author: | Monaco [ Sat Jul 26, 2008 4:36 pm ] |
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Hi, We ran a 3.4 diff in Targa one year and a 3.7 the next with a four syncro SC gearbox. The 3.7 was my choice, the 3.4 is too tall and makes hill starts a killer expecially on really hot engines. I know the English tend to run really low diffs...I don't think this suits our roads as well - mind you I am not an expert! Cheers Rich |
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| Author: | smelly [ Sat Jul 26, 2008 9:10 pm ] |
| Post subject: | |
I just had a close look at my 3.44 diff pinion gear shaged. I think 3.7 would best suit what i want to use the car for thanks for your input. Cheers Tony |
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