Diff ratio

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burls
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Diff ratio

Post by burls » Fri Apr 14, 2017 6:11 am

Just had a look at the gear ratio calculator on Suby gears. If l run 33's with 3.9 final drive l would get 3000 grand @ 100k. This would be using a suby 2.5 and 5 speed suby box in a bug. Is this a good outcome?
71 superbug Subaru Outback cross

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billz60vw
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Re: Diff ratio

Post by billz60vw » Fri Apr 14, 2017 5:57 pm

3000 grand @ 100k????
Any who 33's with a 3.9 is not going to work! You are going to need the 4.44 or the 4.87....and ra close gear set with an .82 5th...

burls
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Re: Diff ratio

Post by burls » Mon Apr 17, 2017 2:25 am

What RPM should l be shooting for at 100k
71 superbug Subaru Outback cross

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billz60vw
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Re: Diff ratio

Post by billz60vw » Mon Apr 17, 2017 1:36 pm

About 36,000 rpm!! :-)
100k = 100,000
Need alot more info! What engine what gear!!

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jsturtlebuggy
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Re: Diff ratio

Post by jsturtlebuggy » Tue Apr 18, 2017 12:22 am

I really think burls is meaning 100 kilometer and hour which is approx 62 miles per hour.
More information is needed.
What kind of vehicle is it ?
How much does it weigh ?

I have a buggy that used both on and off road using 33x10.50R15 tires. I have a Subaru 2.5L N/A and am using a Vanagon 094 5speed transaxle. The ring and pinion ratio is 4.56 and 5th is .85 I can cruise at approx 70mph at around 3100 rpm
I would look at what is available r&p ratios that are a little above a 4 to 1 ratio if you are planning of doing any off roading.
Joseph

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petew
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Re: Diff ratio

Post by petew » Sun Apr 23, 2017 5:14 am

burls wrote:
Fri Apr 14, 2017 6:11 am
Just had a look at the gear ratio calculator on Suby gears. If l run 33's with 3.9 final drive l would get 3000 grand @ 100k. This would be using a suby 2.5 and 5 speed suby box in a bug. Is this a good outcome?
I had a 2.5 in a buggy with a taller 4th in an 091. It ran about those revs. Stock they run those revs...

http://forums.whirlpool.net.au/archive/2483002

burls
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Joined: Thu Mar 30, 2017 6:01 pm

Re: Diff ratio

Post by burls » Thu Jun 01, 2017 1:34 am

back on this. I really want to use the suby box with either a 2.2 or 2.5, so I'll do some more research but looks like l can get 4.86:1 from subygears which should work well
71 superbug Subaru Outback cross

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