Discussion
Hi anyone fitted a better LSD unit ? If do which one and what's it like ? Mine has gone very weak and spinning the inside wheel now , I've fitted a OS giken ( to a race car ) which is amazing traction but not sure I would like to use it as a road diff ?? , or does anybody modify the std unit to take more power ? Cheers craig
I had the Eaton trutrac fitted in mine via Unitrax in California.. Cant fault it..
MADMAX on here has the OS fitted and it failed last week, Geoff Hauser (Hauser Racing) stripped it done to find the crown wheel is a loose fit againt the diff unit and the securing holes are to big causing some play during use....
Baz
MADMAX on here has the OS fitted and it failed last week, Geoff Hauser (Hauser Racing) stripped it done to find the crown wheel is a loose fit againt the diff unit and the securing holes are to big causing some play during use....
Baz
My car (rx7 ) has a gear type diff very much like the quaife unit , it is a bit unpredictable practically if one wheel goes light or coming out of tight corners , or if it lifts a wheel then it does not work ie it needs both wheels to have grip to work ? But never driven a quaife diff in a car to try it ,
Quaife is exactly the same in a Viper, if you lift a wheel, but it doesn't happen on road circumstances only if you come off a curb on track will you ever notice it. IMMOP, OSGiken is the way to go, I've trialled one on track and road and its the best I've driven yet for grip. You can even custom set ramp angles. Ade told me the ring gear bolts failed.. ie not ARP or lock tighted / wired... I don't think it was the Giken itself that was any problem!!
Okay, I'd better chime in here with my 2 pence - I was sort of looking for my opportunity to talk about this so here goes.
My experience with an OSG diff over the last 2 yrs (with aftermarket Dana 3.54 gear) is
good and not-so-good.
The good is, when it's working fine it's very fine - amazing traction.
When it's not working so-good ...... well ...... it's a bit disappointing - okay, a lot disappointing - form your own opinion - I was chuffin lucky.
Take for instance the diff output yolks/shafts - held in by two retaining bolts - sadly these bolts were supplied 1.5mm too long, which meant they eventually came loose and started coming out and leaking oil. I was at LeMans classic last year when this first started - I got home okay and after a bit of head scratching with Geoff Hauser we figured out the problem and I managed a repair on axle stands, diff still in car.
Next (this year at Dunsfold) the ring gear securing blots (10 of them) came loose - bolts floating around inside your diff is not a good idea.
Don't know when or how this first started but my first sign of "things ain't quite right" was when I started loosing diff oil from a hole 'punched' in the side of the diff - yep, one of the loose (sheared) retaining bolts making a break for freedom. Diff out, refurbed and rebuilt - back on the road again, AMAZINGLY no other damage.
Maybe my first problem (above) caused (or contributed) to the second - anyway, over the last 2 weeks I've driven it to North Italy and back and beaten the crap out of it at the Fiat test track at Balocco - with the exception of a small seal weep (not a problem) everything performed excellent and the 10 ring gear retaining bolts are still firmly bolting the ring gear.
So, I've got what I've got and have to get on with it - I'm living in hope I've just had some teething problems that won't recur.
Would I buy another one? Yes, I probably would, but I'd want a complete spare unit on the shelf just in case.
BTW, has anyone got a spare Viper diff they don't want.
Ade
My experience with an OSG diff over the last 2 yrs (with aftermarket Dana 3.54 gear) is
good and not-so-good.The good is, when it's working fine it's very fine - amazing traction.
When it's not working so-good ...... well ...... it's a bit disappointing - okay, a lot disappointing - form your own opinion - I was chuffin lucky.
Take for instance the diff output yolks/shafts - held in by two retaining bolts - sadly these bolts were supplied 1.5mm too long, which meant they eventually came loose and started coming out and leaking oil. I was at LeMans classic last year when this first started - I got home okay and after a bit of head scratching with Geoff Hauser we figured out the problem and I managed a repair on axle stands, diff still in car.
Next (this year at Dunsfold) the ring gear securing blots (10 of them) came loose - bolts floating around inside your diff is not a good idea.
Don't know when or how this first started but my first sign of "things ain't quite right" was when I started loosing diff oil from a hole 'punched' in the side of the diff - yep, one of the loose (sheared) retaining bolts making a break for freedom. Diff out, refurbed and rebuilt - back on the road again, AMAZINGLY no other damage.Maybe my first problem (above) caused (or contributed) to the second - anyway, over the last 2 weeks I've driven it to North Italy and back and beaten the crap out of it at the Fiat test track at Balocco - with the exception of a small seal weep (not a problem) everything performed excellent and the 10 ring gear retaining bolts are still firmly bolting the ring gear.
So, I've got what I've got and have to get on with it - I'm living in hope I've just had some teething problems that won't recur.
Would I buy another one? Yes, I probably would, but I'd want a complete spare unit on the shelf just in case.
BTW, has anyone got a spare Viper diff they don't want.
Ade
Edited by MADMAX-UK on Wednesday 17th July 21:28
There you go Ade
BTW, has anyone got a spare Viper diff they don't want.
Ade
[/quote]
http://forums.viperclub.org/threads/667272-2003-Do...
Ade, are you aware you can use ARP ring gear bolts, locktight, safety wire for track use etc. They usually come with a sheet to advise of machining, esp Gen2 fitment. The OSGiken has tested in good in the harshest of race car Viper conditions, if set up well, having a spare is simply not necessary unless you want to change out rear ratio in a hurry! Also on the subject of diffs, just a reminder that any clutch pack type diff should not be brake tested in the MOT on the rollers, ie locking one wheel. A lot of the Jap cars have it advised on the MOT test sheet, but Vipers do not, so be aware as your MOT tester might not!
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