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scotty timmerman
Samba Member
Joined: January 10, 2010
Posts: 1000
Location: gigharbor W.A
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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 Posted: Fri Jan 06, 2023 5:02 am Post subject: Re: Crown 5023 irs super diff |
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Even though it has the weaker combo gears(which are very Strong)
Being O'l skool,,It's got to be made Better then the China Crap  I've have not had any Issues with my 'Crown' 
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Mon Jan 09, 2023 12:36 pm Post subject: Re: Crown 5023 irs super diff |
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| I had the bug poop version, it had the rong gears in it..so i put the right ones and took some oe shafts and cut&drilled them as the shafts that come with it were soft & wore out.I also put in biger roll pins. and angle drilled for oiling and a oil exhaust to let the oil out. if they do not have a properly placed exhaust port they fill with fine steel dust/muck.witch is nice if you pull it apart to clean them out but that also kills the gear thrust surfaces as thats were it gets slung to... as with everything you need to be smarter than it is. |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Mon Jan 09, 2023 1:16 pm Post subject: Re: Crown 5023 irs super diff |
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The old school Crown IRS super diff isn't worth any more than a new China IRS super diff. All it is is a solid casting. The stock spider gears and the stock end gears that go inside the housing are still stock parts that fail at the same rate.
Twice on my Ghia I broke the splines off the end gears on my China IRS diff.
There are no oiling problems associated with IRS super diffs. All the oiling failures are with the swing axle diffs and the spade end of the axles.
Several years ago I blew up the spider gears on a ZF LSD drag racing my Ghia.
_________________
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
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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RickS
Samba Member
Joined: May 05, 2005
Posts: 430
Location: Speonk, NY
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| Posted: Mon Jan 09, 2023 1:52 pm Post subject: Re: Crown 5023 irs super diff |
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| vwracerdave wrote: |
The old school Crown IRS super diff isn't worth any more than a new China IRS super diff. All it is is a solid casting. The stock spider gears and the stock end gears that go inside the housing are still stock parts that fail at the same rate.
Twice on my Ghia I broke the splines off the end gears on my China IRS diff.
There are no oiling problems associated with IRS super diffs. All the oiling failures are with the swing axle diffs and the spade end of the axles.
Several years ago I blew up the spider gears on a ZF LSD drag racing my Ghia. |
And that is why Dave Folts sells his billet aluminum super diff that uses 091 side and spider gears. |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Mon Jan 09, 2023 5:02 pm Post subject: Re: Crown 5023 irs super diff |
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Wish they still made them 'Super Splines' or what ever they called them BITD 
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Mon Jan 09, 2023 5:06 pm Post subject: Re: Crown 5023 irs super diff |
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| madmike wrote: |
| Wish they still made them 'Super Splines' or what ever they called them BITD |
I broke one of those also.
_________________
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
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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RickS
Samba Member
Joined: May 05, 2005
Posts: 430
Location: Speonk, NY
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| Posted: Mon Jan 09, 2023 6:49 pm Post subject: Re: Crown 5023 irs super diff |
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| vwracerdave wrote: |
| madmike wrote: |
| Wish they still made them 'Super Splines' or what ever they called them BITD |
I broke one of those also. |
Dave, was the one you broke a welded one or a one piece? |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Mon Jan 09, 2023 7:01 pm Post subject: Re: Crown 5023 irs super diff |
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Welded. Broke it clean in 1/2 on the weld joint. Called Rancho and they confirmed the weld joint was a problem on several of them. I believe that is why ERCO quite making them. Replaced both end gears with stock and it's still cruising along today in my Dunebuggy.
_________________
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
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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RickS
Samba Member
Joined: May 05, 2005
Posts: 430
Location: Speonk, NY
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| Posted: Mon Jan 09, 2023 8:45 pm Post subject: Re: Crown 5023 irs super diff |
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| vwracerdave wrote: |
Welded. Broke it clean in 1/2 on the weld joint. Called Rancho and they confirmed the weld joint was a problem on several of them. I believe that is why ERCO quite making them. Replaced both end gears with stock and it's still cruising along today in my Dunebuggy.
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Now that’s disappointing! I thought someone, maybe it was Long Enterprises, had new, one piece ones made at one time, but I couldn’t seem to find any info on them. |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Mon Jan 09, 2023 10:00 pm Post subject: Re: Crown 5023 irs super diff |
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Maybe it was Long or ERCO can't remember who. Never heard of a one piece. All I know about are the welded ones where they spliced the gear end of a Type I with the splined end of 091.
_________________
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
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Tue Jan 10, 2023 5:14 am Post subject: Re: Crown 5023 irs super diff |
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Dame  Dave ever heard of 'Pre-load' LOL JustKidding
Do u remember your air pressure in the slicks and the Launch RPM?? I'm really curious ,Cheers,Mike
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Tue Jan 10, 2023 8:26 am Post subject: Re: Crown 5023 irs super diff |
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| madmike wrote: |
Dame Dave ever heard of 'Pre-load' LOL JustKidding
Do u remember your air pressure in the slicks and the Launch RPM?? I'm really curious ,Cheers,Mike |
Dug it up in my logbook back in 2014.
Ghia with 2276 street engine maybe 165 HP racing with no belt and 20 PSI in Phoenix 26X6 slicks. Pass before it broke 13.45 @98.89 MPH. Usually launch around 5000 RPM. 4.12 R&P with 1.48/1.04.
It broke clean at the weld joint.
_________________
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
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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mark tucker
Samba Member
Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Tue Jan 10, 2023 10:01 am Post subject: Re: Crown 5023 irs super diff |
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| they didnt key/pin those first? |
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madmike
Samba Member
Joined: July 11, 2005
Posts: 5292
Location: Atlanta,Michigan
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| Posted: Wed Jan 11, 2023 5:31 am Post subject: Re: Crown 5023 irs super diff |
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With 20 pounds in the Slicks it should not have broke! Bad weld!
Guess I'm just lucky I've had my slicks down to 15 lbs. I watch the Tree not the Tach so I have no idea what my Launch rpms are? no way to data log, maybe my PLX can do that? Tried taking a buddy for a ride but he got scared and forgot to look at the Gauge I'm gonna try a 2 step Launch this season, should be interesting,I've never launched on Boost 
Cheers,Mike
_________________
'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works" |
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