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Author Topic: Open spool or posi-traction rear ends??  (Read 18310 times)

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Offline kiwi belly tank

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Re: Open spool or posi-traction rear ends??
« Reply #30 on: March 22, 2014, 02:27:41 PM »
The long wheel base & narrow track of a liner will be more forgiving in this situation than a production based vehicle.
It would be well worth getting some input from the short fat FWD guys before spooling up.
  Sid.
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Offline SPARKY

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Re: Open spool or posi-traction rear ends??
« Reply #31 on: March 22, 2014, 04:07:19 PM »
tons of hi-po FWD & AWD cars have Torsens from the factory
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Offline grumm441

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Re: Open spool or posi-traction rear ends??
« Reply #32 on: March 22, 2014, 06:57:04 PM »
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Offline Jack Gifford

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Re: Open spool or posi-traction rear ends??
« Reply #33 on: March 22, 2014, 11:50:59 PM »
Quote from: grumm441 link=topic=13730.msg247553#msg247553 date=1395529024[/quote
... No need to lose the 9"...
Unless you want to lose the [presumed] 4% frictional loss of the 9" rear's inherent geometry (extreme pinion offset).
« Last Edit: March 22, 2014, 11:52:31 PM by Jack Gifford »
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gkabbt

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Re: Open spool or posi-traction rear ends??
« Reply #34 on: March 23, 2014, 08:34:44 AM »
Guys, Thanks for the FWD info.....Torsen it will be!  :cheers:

Gregg
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Offline sirstude

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Re: Open spool or posi-traction rear ends??
« Reply #35 on: March 24, 2014, 04:24:04 PM »
Sum,

Is that GM torsen carrier basically the same unit as the Detroit TruTrack that I run in my Impala?  Seems to look kind of the same, but never been inside of the carrier.

Doug
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Offline Sumner

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Re: Open spool or posi-traction rear ends??
« Reply #36 on: March 24, 2014, 05:26:45 PM »
Quote from: sirstude on March 24, 2014, 04:24:04 PM
Sum,

Is that GM torsen carrier basically the same unit as the Detroit TruTrack that I run in my Impala?  Seems to look kind of the same, but never been inside of the carrier.

Doug

I'm probably not really qualified to answer but from what I read they both work on the same principal and yes do look the same.  Some sources I read imply that the TruTrack might be a stronger unit and that possibly ....

Quote
I know both function similarly but the torsen has a 4:1 bias ratio vs. the truetrac's 2.5-3.5:1
http://www.nrscca.com/forum/viewtopic.php?f=21&t=3078

....now I think that it is only some of the torsens (T2R not the one that came in the Camaro's) that have the higher bias ratio (the ratio of power they can transfer to the wheel with traction).

A couple links...

http://www.torsen.com/products/products.htm

http://www.eaton.com/Eaton/ProductsServices/Automotive/AutomotiveAftermarket/Differentials/PCT_338418#tabs-2

See you at Speed Week next year?

Sum
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Offline GH

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Re: Open spool or posi-traction rear ends??
« Reply #37 on: March 24, 2014, 05:38:34 PM »
I ran a spool in the 9" Ford rear 2.47 gear, never spun, did get loose in 09 between the 4 and 5 mile. Went 248 in 09. That was the only time it got loose except in the lower gears, when it got loose I would grab the next gear, was always in 5th before the 1 mile.
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Offline Avanti Kid

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Re: Open spool or posi-traction rear ends??
« Reply #38 on: March 25, 2014, 12:41:49 AM »
Thanks guys for all your good inputs on this subject, take care, Dave  :cheers:
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Offline sirstude

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Re: Open spool or posi-traction rear ends??
« Reply #39 on: March 25, 2014, 08:30:53 AM »
Sum,

Thanks, I really like that rear in the Impala, when I had the locker it was almost impossible to drive on slow curvy roads.  Yes, I will be at Bonneville this summer.  Just verified my reservations at the Garter yesterday.

Doug
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Doug Strong

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