Any ideas whats causing this diff noise?

[richierich]

This is with the rear wheels off the ground just spinning them by hand. Pretty terrible noise. Any idea what might be causing it?

Trans is a swingaxle, superdiff, race axles and has around 1000 miles on it.

https://www.youtube.com/watch?v=evvQek2srDI&feature=youtu.be

[Howard 111]

I can't hear it for the noise of the exhaust, but it sounds good, and looks good too. Someone with better hearing will come along.
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

[richierich]

Haha - thanks Howard - I hope you're keeping well since we spoke .

The motor is not running in the video!!

[vwracerdave]

Don't drive it. Drain the gear oil and look for chunks. The noise is spider gears or fulcrum plates or ring & pinion gear. If the car has been lowered a lot that it might be wheel bearings but probably not.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK

[richierich]

Dave - the car is stock height at the rear. I'm going to drain the fluid and take the trans out. I did have the car out for 10 miles or so and noticed this noise when I came back to the shop

[Howard 111]

Sorry, I had the volume too high, and it sounded like the engine was sputtering. Yes, you need to find out what's going on with it. Good luck!
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

[gears]

Super diffs are notorious for poor quality, and poor internal oiling.
_________________
aka Pablo, Geary
9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[richierich]

OK - what would be the best alternative? A Quaife or something? If I decide to put a swingaxle Quaife in it, do the normal paddle axles just go straight in or is there other stuff that has to be done?

[gears]

Straight in. There was a thread some time back (Dawn's bug) that detailed Ray Vallero's mods for unsuper diffs.
_________________
aka Pablo, Geary
9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[jg405i]

DO NOT TAKE IT TO WRIGHT TRANSMISSION.

[Casting Timmy]

Gears, how much power can the 10/15 tooth swing diff handle? I know you side it did better than the 11/17 super diff in off road.

There are two sets of 15 tooth side gears in the classifieds right now and Weddle even has some stock on used ones, so it's still an option to convert back to the stock diff and 15 tooth gears.

[gears]

That's absolutely what I would do over a SD. Stock diff, dual circlips, 10/15 spiders/side gears.
_________________
aka Pablo, Geary
9.36 @ 146 in '86 Hot & Sticky
'90 Syncro Westy SVX
'87 Syncro GL 2.5
https://guardtransaxle.com

[richierich]

So you wouldn't run a super diff at all? This is a street car with approx 185hp...

[modok]

It's not power it's TORQUE
Traction, vehicle weight & clutch

[richierich]

[vwracerdave]

Super Diffs need to be modified by adding additional oiling holes. Take your transaxle to somebody that knows about them.

A stage 2 PP is too big for your car with street tires. You will just break the transaxle and probably why you broke the transaxle to begin with. A stage 1 PP should be all you need.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK

[richierich]

vwracerdave, the trans was built by Kevin @ KCR and he advised me to go with a Stage 2....

[modok]

I think you'd be ok with the diff as Gears says. Just don't run a four puck, they grab harder in second than first
Quaife is very nice unit IMO, but watch out for understeer on slippery surfaces.

[richierich]

[modok]

Yes. i have seen the late IRS diff handle a LOT, with the coarser tooth gears, so it makes sense it's possible.
You could also cryo and then temper the gears, which does not help a TON, but it doesn't cost much either.

I do not know if there is differences in the strength of the diff housings, but that also could be a concern. Need to hold the gears in proper alignment, thus the dual clips, and so forth. Seen diff housings break...... but not sure if that was before or after the gears exploded. Food for thought.