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| Quick diff question. https://www.ausmini.com/forums/viewtopic.php?f=2&t=87917 |
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| Author: | 74Club-man [ Tue Dec 02, 2014 3:46 pm ] |
| Post subject: | Quick diff question. |
Sounding like a newbie, what's the pro's and con's of both 3.4 and 3.7 crown-wheels?? |
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| Author: | drmini in aust [ Tue Dec 02, 2014 5:59 pm ] |
| Post subject: | Re: Quick diff question. |
3.44 is good for a road car, as long as the motor is a 1098 or bigger. 3.76 was fitted stock on 850, 997/998 Cooper and 998 Mini Deluxe, is also used in group Nb race cars. It's a bit busy for cruising with a big motor. In between there is a 3.647, was fitted to most Mini K and 1100 Clubbies using the remote box. |
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| Author: | 74Club-man [ Tue Dec 02, 2014 6:36 pm ] |
| Post subject: | Re: Quick diff question. |
So a 3.76 (22g401) is best for a standard 998? If so it looks like I have a 22g411 to sell. |
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| Author: | Kennomini [ Tue Dec 02, 2014 7:30 pm ] |
| Post subject: | Re: Quick diff question. |
Basically the higher the number the more revs you'll be doing at 100km/h. Or to put it another way the faster you'll accelerate off the line. |
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| Author: | drmini in aust [ Tue Dec 02, 2014 8:14 pm ] |
| Post subject: | Re: Quick diff question. |
74Club-man wrote: So a 3.76 (22g401) is best for a standard 998? If so it looks like I have a 22g411 to sell. 3.44 was used in most Mini rodchange boxes, including the 998 from 1975 on. A 3.76 is better for going up hills with a 998 though. 
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| Author: | 74Club-man [ Wed Dec 03, 2014 6:36 am ] |
| Post subject: | Re: Quick diff question. |
Thanks guys. |
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| Author: | 1071 S [ Wed Dec 03, 2014 8:58 am ] |
| Post subject: | Re: Quick diff question. |
Like Doc says... but consider carefully what you intend to do ... and where you live. A 3.7 will blunt the acceleration edge and require an earlier downshift on hills. The upside is a much more relaxed car if you spend any amount of time on the freeway/highway.. Cheers, Ian Oh, and BTW, its not just the crown wheel involved in ratio change.. |
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| Author: | drmini in aust [ Wed Dec 03, 2014 10:05 am ] |
| Post subject: | Re: Quick diff question. |
1071 S wrote: Like Doc says... but consider carefully what you intend to do ... and where you live. A 3.7 will blunt the acceleration edge and require an earlier downshift on hills. The upside is a much more relaxed car if you spend any amount of time on the freeway/highway.. Cheers, Ian Oh, and BTW, its not just the crown wheel involved in ratio change.. Ian you got that statement arse about... 
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| Author: | 9YaTaH [ Wed Dec 03, 2014 10:46 am ] |
| Post subject: | Re: Quick diff question. |
74Club-man wrote: So a 3.76 (22g401) is best for a standard 998? If so it looks like I have a 22g411 to sell. Why? just tickle the engine a little so that it will pull the higher diff and enjoy the lower revs when cruising...(if that is your thing and the type of work the car does). |
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| Author: | 1071 S [ Wed Dec 03, 2014 11:37 am ] |
| Post subject: | Re: Quick diff question. |
drmini in aust wrote: 1071 S wrote: Like Doc says... but consider carefully what you intend to do ... and where you live. A 3.7 will blunt the acceleration edge and require an earlier downshift on hills. The upside is a much more relaxed car if you spend any amount of time on the freeway/highway.. Cheers, Ian Oh, and BTW, its not just the crown wheel involved in ratio change.. Ian you got that statement arse about... Not a big problem ...only the numbers are wrong.... and I got the three correct  But just to remove confusion.. I should have typed "3.44" Cheers... |
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| Author: | 74Club-man [ Wed Dec 03, 2014 2:43 pm ] |
| Post subject: | Re: Quick diff question. |
Ok so snap question, what is the best diff ratio for a stage one 998 to be used for shows and general Sunday cruising??? |
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| Author: | drmini in aust [ Wed Dec 03, 2014 2:59 pm ] |
| Post subject: | Re: Quick diff question. |
3.44 then.
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| Author: | 74Club-man [ Wed Dec 03, 2014 6:05 pm ] |
| Post subject: | Re: Quick diff question. |
Thanks drmini. |
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