ausmini :: View topic - Diff ratio's

Try guessworks website, easy to use for any combo!

http://www.guess-works.com/Tech/ratio.htm

Cheers Shane

A 2.95 will suck, it will be a dog off the line, even with a stock gearset inside.

Excellent, thank you all for the replies. Looks like I need to add a new diff to the list of things I want/need to replace.

Since i will do almost all highway driving a 3.1 will probably be best if not a 2.95.

cheers,

CJ

I used to run a 2.95 in a 1330, 731 cam, stock head, twin 1/4's & 10" rims. Nothing to right home about off the line but once your off the mark it was great. Cruised the highway at 3300 RPM at 100kph. It was a great combo. Good around town, but you need to use the gearstick a little more than usual.
With your 12" rims a 3.1 will sit at about 3350 RPM @ 100kph!

Cheers Shane

Author:	womble99 [ Wed Jul 03, 2013 9:23 am ]
Post subject:	Diff ratio's
Anyone able to give a breakdown of rpm to km/h (eg rpm @ 110km/h) for the different diff ratios? I have tried searching the forum as I am sure it has been posted before, but I could only find a set for the P76 cheers, CJ

Author:	drmini in aust [ Wed Jul 03, 2013 9:37 am ]
Post subject:
My 3.647 diff & 165/70-10 A008s does 4,600rpm @ a GPS 110KMH.

Author:	Convertible Mini [ Wed Jul 03, 2013 9:40 am ]
Post subject:	Diff ratio
I have 1975 Mini fitted with a 1380cc, 104 Cam, HIF 44, 3.1:1 diff ratio and using A+ standard Box and 12" wheels and does 100Km/Hr and sits on 3200 rpm. Makes it a pleasure to drive and also helps with Fuel economy. I have calculated that it does approx 15.5 Km / Litre. or 6.5 Lt per 100 Km. And Speedo is accurate according to My GPS.

Author:	Lillee [ Wed Jul 03, 2013 10:45 am ]
Post subject:
3.44 diff (stock S, clubman ratio), 10 inch wheels in 4th gear: 2400rpm = 60km/h 2700rpm = 70km/h 3100rpm = 80km/h 4100rpm = 110km/h 8000rpm = Jail Approx, except the jail part, that is for certain.

Author:	MiniVLT [ Wed Jul 03, 2013 11:02 am ]
Post subject:
Try guessworks website, easy to use for any combo! http://www.guess-works.com/Tech/ratio.htm Cheers Shane

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Diff ratio's https://www.ausmini.com/forums/viewtopic.php?f=2&t=81979	Page 1 of 2

Author:	Lillee [ Wed Jul 03, 2013 11:09 am ]
Post subject:
MiniVLT wrote: Try guessworks website, easy to use for any combo! http://www.guess-works.com/Tech/ratio.htm Cheers Shane Great site. Well I wasn't far off. I only remember it for my car only as I use tacho instead of speedo to gauge speed

Author:	michaelb [ Wed Jul 03, 2013 11:17 am ]
Post subject:
Quote: 8000rpm = Jail I suspect 8000rpm would be down a big hill? Conrod Straight? May be also followed by a few pistons trying to escape

Author:	Lillee [ Wed Jul 03, 2013 11:19 am ]
Post subject:
Lillee's done 8000rpm every gear (cept 4th) at Western Sydney Dragway, several runs But yeah, not sure she could do it in 4th though

Author:	womble99 [ Wed Jul 03, 2013 4:32 pm ]
Post subject:
Excellent, thank you all for the replies. Looks like I need to add a new diff to the list of things I want/need to replace. Since i will do almost all highway driving a 3.1 will probably be best if not a 2.95. cheers, CJ

Author:	drmini in aust [ Wed Jul 03, 2013 4:40 pm ]
Post subject:
A 2.95 will suck, it will be a dog off the line, even with a stock gearset inside. [edit] I would go with a 3.1 or 3.2 for highway work.

Author:	womble99 [ Wed Jul 03, 2013 4:51 pm ]
Post subject:
drmini in aust wrote: A 2.95 will suck, it will be a dog off the line, even with a stock gearset inside. I must admit my mini isn't anything special, pretty stock really 1275 twin 1-1/4 su's on 12" rims. I don't want to turn it into a real pig to drive but I would like to make it a nice cruiser (what I mainly do anyway).

Author:	Kennomini [ Wed Jul 03, 2013 4:51 pm ]
Post subject:
womble99 wrote: Excellent, thank you all for the replies. Looks like I need to add a new diff to the list of things I want/need to replace. Since i will do almost all highway driving a 3.1 will probably be best if not a 2.95. cheers, CJ I have a 3:1 in my mini on 10" wheels and I love it, still good around town and on the highway it sits well under 4000. From memory 120km is around 4000. My twinki engine will get eiter a 3:1 or a 3:2.

Author:	MiniVLT [ Wed Jul 03, 2013 5:05 pm ]
Post subject:
I used to run a 2.95 in a 1330, 731 cam, stock head, twin 1/4's & 10" rims. Nothing to right home about off the line but once your off the mark it was great. Cruised the highway at 3300 RPM at 100kph. It was a great combo. Good around town, but you need to use the gearstick a little more than usual. With your 12" rims a 3.1 will sit at about 3350 RPM @ 100kph! Cheers Shane

Author:	womble99 [ Wed Jul 03, 2013 5:09 pm ]
Post subject:
MiniVLT wrote: I used to run a 2.95 in a 1330, 731 cam, stock head, twin 1/4's & 10" rims. Nothing to right home about off the line but once your off the mark it was great. Cruised the highway at 3300 RPM at 100kph. It was a great combo. Good around town, but you need to use the gearstick a little more than usual. With your 12" rims a 3.1 will sit at about 3350 RPM @ 100kph! Cheers Shane nice, but it won't have 12's as soon as i can afford 10's

Author:	1071 S [ Fri Jul 05, 2013 9:36 pm ]
Post subject:
I think you will find is pretty much: 3.76 = 14.6 mph/K revs 3.44 = 16.4 3.1 = 18.1 10" wheels (which of course are not all the same diameter) - but close enough. Cheers, Ian

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