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Open VS Limited Slip. Your opinions, please
Posted by: Mark M ()
Date: December 18, 2011 08:37AM

Eventually I am going to swap my 3:55 open diff for a 3:27. A member here has offered a swap, but I am likely a year away from that project.

I would like your opinions in limited slip (posi) VS the standard open diff. It's not like I will be drag racing this car, and I plan to drive it year-round, which means possible ice and snow. What say you?

Mark M
Project: 64 Spyder Convertible
1st Vair: 65 Corsa 140
St. Louis, MO
Show Me Corvair Club &
CORSA member

"If it's not broken, you're not driving it hard enough"

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Re: Open VS Limited Slip. Your opinions, please
Posted by: MattNall ()
Date: December 18, 2011 08:40AM

Posi is good if driving in ice and snow and mud and sand...

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
...............110-PG.................................................Webered-Turbo

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Re: Open VS Limited Slip. Your opinions, please
Posted by: 4carbcorvair ()
Date: December 18, 2011 08:45AM

All depends on the situation.

A posi can make snow/ice driving quite interesting in a front engine/rear drive vehicle. I have a posi (not a locker) in the rear of my Jeep, the back end wants to swing out much more due to both tires spinning. I didn't have this issue when I was open in the rear as one tire would spin and I could maintain straight direction. Posi can also be a good thing in the right situation where if you were open, you would be stuck. Posi clutch packs don't last for ever and need an occasional rebuild, especially on a DD, not cheap.

I have never driven a posi Corvair in snow, I have driven open. I had no issues at all with an open diff on slippery roads. I would almost compare the car to a 4wd. With a set of good snows, an open diff shouldn't be an issue.

--------------------------------
Ronnie
Southern Maine.
www.dirigocorvairs.net
66 Corsa Convertible, 140, 4sp.
65 Monza Convertible, 110, PG.




It doesn't leak, it's marking it's territory.

A mirror is a reflection of the miles travelled.

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Re: Open VS Limited Slip. Your opinions, please
Posted by: cnicol ()
Date: December 18, 2011 08:50AM

IMO, they're a mixed bag but after you shake it all out, they do add some value. I have them on both my cars and I live in snow country.

While I wouldn't consider driving the Corvairs during the winter (I'm not going to subject them to salt, deicer, or accidents) I do move them around on my hilly property when there's snow and ice on the ground and that's when the posi comes in handy.

Positives:
More traction than a regular Corvair

Negatives:
Reputation for breaking
Howl on slow tight turns (yes I have Posi addititve in both)
Less secure on side slopes

I guess I'd call that a mild recommendation.smiling smiley

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
65 Canadian Monza 4dr 110/PG 40k
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Open VS Limited Slip. Your opinions, please
Posted by: bill darcy ()
Date: December 18, 2011 08:50AM

I'd take the posi everytime.

In the Hub City, Belen NM

Lead from behind..... get left in the dust
"I have not failed I've just found ten thousand ways that won't work" Thomas Edison

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Re: Open VS Limited Slip. Your opinions, please
Posted by: Hex173t ()
Date: December 18, 2011 08:51AM

With an open diff, if you can't move because 1 wheel is spinning up (like on ice), if you put alittle parking brake on, it will bias some torque to the wheel that has the traction.

Bill

Edited to add 'ice'



Edited 1 time(s). Last edit at 12/18/2011 08:52AM by Hex173t.

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Re: Open VS Limited Slip. Your opinions, please
Posted by: 4carbcorvair ()
Date: December 18, 2011 08:53AM

I have a posi and lockright locker in my Jeep. Even the best of the best will not get you out when you are stuck. When you are stuck, you are stuck! LOL



--------------------------------
Ronnie
Southern Maine.
www.dirigocorvairs.net
66 Corsa Convertible, 140, 4sp.
65 Monza Convertible, 110, PG.




It doesn't leak, it's marking it's territory.

A mirror is a reflection of the miles travelled.

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Re: Open VS Limited Slip. Your opinions, please
Posted by: aircooled ()
Date: December 18, 2011 09:03AM

I generally don't like it. Unless you drive on ice a lot (highly unlikely) it will likely have no use. Corvairs have a LOT of traction already.

For performance driving (autoX) a posi diff will tend to make the car push coming out of corners.

Tim
Southern California - Where the stars are on the ground and dirt is in the sky

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Re: Open VS Limited Slip. Your opinions, please
Posted by: davemotohead ()
Date: December 18, 2011 09:17AM

I have a posi in my yellow corsa,,and had a open diff before I broke it,,what I have found,,in tight corners at speed,,the posi will make the front end push under power were as the open did not,,the posi will get the rear sideways alot easyer in slipery conditions than the open diff and you need to be ready for it,,mine did squeel some when it got hot when going around tight corners like in a parking lot,,I did add the GM posi additive when I built it and it still made noise,,BUT,,I bought the Ford additive as I read it worked better and it hasen't made a sound since,,so use the Ford stuff,,I had a posi in a ranch car that saw nothing but dirt roads and must say,,that car was almost 4WD like and would go almost anywhere,,it was amazing the places it would go in sloppy mud and snow,,I think for auto cross tight corners the open diff might be better as to not push the front end,,I like the posi because for me its fun in the rain to play as I can go down the road sideways in 3rd gear and its fun drifting it around in the wet weather! smoking smiley







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Open VS Limited Slip. Your opinions, please
Posted by: richard1 ()
Date: December 18, 2011 09:20AM

I like it on both my Grand Cherokee and my BMW. The BMW ends up on sand-on-asphalt a lot, and it keeps me accelerating with posi.

Restoration in Bolivia
Richard's Mini Pickup
Richard's Corvair
Richard's Renault Dauphine

Selection of the Right Motor Oil for the Corvair
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How to polish and restore stainless and aluminum trim

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Re: Open VS Limited Slip. Your opinions, please
Posted by: vairmech ()
Date: December 18, 2011 09:32AM

I have driven a Corvair extensively in the winter time in days gone by. I never had a posi and in the winter time we would take the Corvair instead of a 4 wheel drive vehicle! The Corvair would rival but never exceed the 4 wheel drives for traction. Maybe the posi would have been better but I also know that it is a little more control oriented in the slippery stuff, not exactly what you want all the time.

For the little bit posi might add for traction on the straight the over all control will be the factor you need to look at.

I had an open diff in a drag car that I had and when I would do burnouts, both tires would spin. I never had a control problem because of an open diff.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Open VS Limited Slip. Your opinions, please
Posted by: steve c goodman ()
Date: December 18, 2011 09:59AM

I have been driving Corvairs since they came out. My 62 spyder came from the factory with the posi (I bought as demonstrator in 63) and I immediately came to dislike the posi. It pushed badly on snow/ice on the roads and was terrible on gravel road hill climbs too but it was entertaining while ice racing on frozen lakes in the wintertime. When I swapped to 64 rear suspension in 66 the posi went and an open diff has always been in the car. Unlike a couple of the posters above, I drive one of my Corvairs every day of the year and the spyder has over 500K miles on it.

Read above and it tells you how to stop a wheel from slipping, old school driving technique that works well. Also I have found many posi clutch pack housing fail/broken at the bearing, the original housing is fairly weak.

Remember however that my statements are my opinion only.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

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Re: Open VS Limited Slip. Your opinions, please
Posted by: 65 Crown Corsa ()
Date: December 18, 2011 10:03AM

I run either in my corv8 and am starting to favor a open diff, in my application it allows something to break free without breaking.

Ed
65 Crown/Wills Corsa
WPB Florida

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Re: Open VS Limited Slip. Your opinions, please
Posted by: vairchet ()
Date: December 18, 2011 10:43AM

I have lots of broken posi-type differentials sitting about (both early & late) as compared to open drive. Rather flimsy design, especially early models. My '66 Monza and Debbie's '64 Monza have posi and they both groan going around corners at low speed (yes, they're using special additives). Surprised the '64 hasn't blown out the differential by now. Quite satisfied with open drive in any final gearing combination. When driven sanely, 4-spyder carriers are unnecessary as well.... perhaps useful in FCs that consistantly carry heavy loads.

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Re: Open VS Limited Slip. Your opinions, please
Posted by: richard1 ()
Date: December 18, 2011 11:39AM


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Re: Open VS Limited Slip. Your opinions, please
Posted by: davemotohead ()
Date: December 18, 2011 12:00PM

Hey Chet,,try the Ford additive,,you can buy it at the dealer,,my posi quit making any noise when I added it and runs smooth and quiet now thumbs up

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Re: Open VS Limited Slip. Your opinions, please
Posted by: Caraholic4life ()
Date: December 18, 2011 12:06PM

65 Crown Corsa Wrote:
-------------------------------------------------------
> I run either in my corv8 and am starting to favor
> a open diff, in my application it allows something
> to break free without breaking.


I had a posi in my Kelmark car for a while and found that under acceleration into a turn, the car wanted to go straight. I replaced it with a non posi and liked it much better for that car.

1962 95 F.C. Van
1964 Greenbrier Deluxe
1965 Monza Coupe
1965 Monza Convertible
Westminster, Maryland

MID ENG enthusiast &
prior Kelmark owner.

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Re: Open VS Limited Slip. Your opinions, please
Posted by: Johnniespeed ()
Date: December 18, 2011 04:23PM

In winter driving, when coming accross an icy patch, the open differential car will drive a straighter line, where the posi will tend to slide sideways.
As said before the benefits/drawbacks are a tradeoff.
My Greenbrier is 4:11 posi, the Rampside is 3:27 open diff.

John

1962 Rampside, 4.3 Vortec powered.
The thrill of speed overcomes the fear of death.

Sparta Michigan.


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Re: Open VS Limited Slip. Your opinions, please
Posted by: vairmech ()
Date: December 18, 2011 06:16PM

Yeah Steve, they are your opinions and 99 & 44/100% of the time you and I agree on what is said. We have had similar experiences with mostly the same outcome.

steve c goodman Wrote:
-------------------------------------------------------
> I have been driving Corvairs since they came out.
> My 62 spyder came from the factory with the posi
> (I bought as demonstrator in 63) and I immediately
> came to dislike the posi. It pushed badly on
> snow/ice on the roads and was terrible on gravel
> road hill climbs too but it was entertaining while
> ice racing on frozen lakes in the wintertime.
> When I swapped to 64 rear suspension in 66 the
> posi went and an open diff has always been in the
> car. Unlike a couple of the posters above, I
> drive one of my Corvairs every day of the year and
> the spyder has over 500K miles on it.
>
> Read above and it tells you how to stop a wheel
> from slipping, old school driving technique that
> works well. Also I have found many posi clutch
> pack housing fail/broken at the bearing, the
> original housing is fairly weak.
>
> Remember however that my statements are my opinion
> only.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Open VS Limited Slip. Your opinions, please
Posted by: Mark M ()
Date: December 19, 2011 04:53AM

Wow, glad I asked. Years ago I heard that open was best in snow and ice because when one wheel slipped, the other gave you traction. Sounds like that is only partially true - keeping in mind the E-brake suggestion above. And, I did not know about the posi causing the front to push with hard cornering. Does sound like you could have fun steering with the rear end on slippery surfaces, though!

It will be an open diff for me.

PS Good to see Steve Goodman post. God bless you, Steve.

Mark M
Project: 64 Spyder Convertible
1st Vair: 65 Corsa 140
St. Louis, MO
Show Me Corvair Club &
CORSA member

"If it's not broken, you're not driving it hard enough"

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