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Q: What's a UN1 Gearbox?
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boulderdrop
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PostPosted: Sun Feb 06, 2011 1:57 pm    Post subject: Q: What's a UN1 Gearbox? Reply with quote

I've heard this mentioned a few times, but I don't know what a UN1 gearbox is.
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D Clymer
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PostPosted: Sun Feb 06, 2011 2:47 pm    Post subject: Reply with quote

Alika can tell you a lot more about this transmission than I can, but it is a Renault transaxle designed for longitudinal mounted powertrains. It had a convertible ring and pinion assembly so it could be used for rear engine or front engine/front drive cars. It was used on something as exotic as the Lotus Espirit, something as unusual and cool as the Renault Alpine and the Delorean, and something as pedestrian as the Eagle Medallian. It has a bolt on bellhousing so there are many engine adaptations possible.

Apparently a good component. The only downside to using one in a Vanagon is its length.

David
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ALIKA T3
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PostPosted: Sun Feb 06, 2011 10:14 pm    Post subject: Reply with quote

http://www.thesamba.com/vw/forum/viewtopic.php?t=449503 LAST WEEK Rolling Eyes
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VisPacem
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PostPosted: Mon Feb 07, 2011 7:54 am    Post subject: Reply with quote

D Clymer wrote:
Alika can tell you a lot more about this transmission than I can, but it is a Renault transaxle designed for longitudinal mounted powertrains. It had a convertible ring and pinion assembly so it could be used for rear engine or front engine/front drive cars. It was used on something as exotic as the Lotus Espirit, something as unusual and cool as the Renault Alpine and the Delorean, and something as pedestrian as the Eagle Medallian. It has a bolt on bellhousing so there are many engine adaptations possible.

Apparently a good component. The only downside to using one in a Vanagon is its length.

David


Just as an historical detail, said UN1 (IRS) transmission was used on Alpines, however,and at least to me , Alpine automatically means Alpine A110, 1.1l, 1.3l or 1.6l.
Yes indeed Alpine, thereafter aka Renault-Alpine continued on with the 310, I believe 310 or 610 GTA with said UN1 IRS transmission as, THE famous Alpine, the A110 never had an IRS transmission making do (very well) with a swing axle, which was common to the Renault R8 Gordini 1.1l and 1.3l, not taking into account the racing version factory works.

The reason for the post is that I was at first puzzled on how a Vanagon would behave with a swing axle, my real knowledge of Alpine cars being limited to the 106, 108 and 110.

I am sure Monsieur Alika can give us all the "dirty" details Laughing
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ALIKA T3
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PostPosted: Mon Feb 07, 2011 10:03 am    Post subject: Reply with quote

Hello!

Alpine GTA
Image may have been reduced in size. Click image to view fullscreen.


Model Part No.

Renault 21 Turbo UN1-013 25
R21 GTX UN 1-03

R25V6 UN 1-04
R25 Armored UN 1-06
R25V6 Turbo UN1-08

Alpine GTA * UN1-05
Alpine Turbo UN1-07
Alpine A310V6 369-02

R30TX 369-01/06/017
R30TS 369-01/06/014

Renault Espace (earlier models) UN1
Renault Master van:UN 5 (you can't flip the ring,its diameter is too big)

DeLorean 369

Lotus Esprit UN1-25/26/27 (stronger cases and pinion/shaft assemby maybe?)

Venturi ??


Gear ratios of various UN1/369 variants

Model Part No. 1st 2nd 3rd 4th 5th Rev Diff

R5 Turbo 1 369-04(+)/09 3.36 2.06 1.38 1.06 0.87 3.18 3.89 =(couple9x35)

R5 Turbo 2 369-15 3.36 2.06 1.38 1.06 0.87 3.18 3.89=(R&P 9x35)

R20 369.00 3.36 2.06 1.38 1.06 0.82 3.55 4.11 =(9x37)

369.05 3.36 2.06 1.38 1.06 0.82 3.55 4.11 =(9x37)

R20TX 369 3.36 2.06 1.38 1.06 0.87 3.55 3.778

R20LS/TS 369 3.82 2.18 1.41 1.03 0.86 3.55 3.778

R21Turbo UN1-013 3.36 2.05 1.38 1.03 0.82 3.54 3.44 =(couple9x31=

R25GTX UN 1-03 3.36 2.05 1.38 1.04 0.82 3.55 3.89

R25V6 UN 1-04 3.36 2.05 1.38 0.96 0.76 3.55 3.89

Alpine GTA * UN1-05 3.36 2.05 1.38 1.04 0.82 3.55 3.44 =(couple9x31)


R&P 9x35 ( 3.89)
special pinions for rally (strait cut) TDC? (I don't what it means)
1st 39x12 3.25
2nd 38x17 2.24
3rd 34x21 1.62
4th 30x24 1.25
5th 29x28 1.04
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boulderdrop
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PostPosted: Mon Feb 07, 2011 10:32 am    Post subject: Reply with quote

Interesting! The specs are pretty detailed. I don't get how they are used in the Vanagon platform.

ALIKA T3 wrote:
Subaru EJ22+UN1 5 speed transmission


How is your's mounted? Do you have any pics? Just not sure how it works.
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ALIKA T3
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PostPosted: Mon Feb 07, 2011 4:00 pm    Post subject: Reply with quote

Hello!

You have the choice to back up your engine or cut the crossmember and make another one.

I use the vanagon shifter,I attached the VW ball selector to it and shortened the linkage.I did a replica of the vw shifter,shorter with same bushings and location basically.
Many options have been done,but I like mine,easy.

The bellhousing mates with an adapter plate that needs to be 15 or 20mm I don't remember,I did mine not thick enough for the Subaru,it should have been 15mm,I did 3/8 so I removed material from the input shaft where the coupling is attached.
The splines are the sames as VW,so that's butter.

That's the easiest cheapest swap you can dream about,specially since I found out Delorean flanges can be used along with Eurovan 33 splines cv joints on the VW axle shaft.

You can look at pics on the link in my signature,they are spread over the period,but they are accurate pics Wink

Bye!
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syncrodoka
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PostPosted: Mon Feb 07, 2011 10:17 pm    Post subject: Reply with quote

http://ultimate-engineering.co.uk/renaultun1.html
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IdahoDoug
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PostPosted: Mon Feb 07, 2011 10:38 pm    Post subject: Reply with quote

Random thread hijack. I got to drive a new Alpine GT somethingerather 310 on the streets of Lansing, Michigan in 1984. I had it for a week and was impressed by French automotive engineering (wait - that's an oxymoron). It was a beefed model with big front air dam, fender flares and the yellow headlights got me some further unwanted attention. A serious motorcycle accident happened right in front of me and I used the Alpine to block traffic until the ambulance arrived (rider was down in the street). An overzealous officer noticed the headlamps, flipped out on me about the car and started telling me to follow him to the station until another officer who was aware I had played a minor role in helping them talked him out of it. Wild car. Forgot all about it until this random thread.

DougM
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syncrogreg
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PostPosted: Tue Feb 08, 2011 7:09 am    Post subject: Reply with quote

Just a cad but I'm sure it's a great product.


http://shop.busprojekte.de/un1-getriebeumbau/umbauteile-t3/subaru-getriebeglocke.html


GSB
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boulderdrop
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PostPosted: Tue Feb 08, 2011 9:57 am    Post subject: Reply with quote

syncrodoka wrote:
http://ultimate-engineering.co.uk/renaultun1.html


Nice link, Thanks man! That helps a lot to understand too.
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keithwwalker
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PostPosted: Sun Feb 26, 2012 2:48 am    Post subject: Reply with quote

Thread info = golden, thanks!
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PostPosted: Sun Feb 26, 2012 3:10 am    Post subject: Reply with quote

If you have a Subi conversion, forget the UN1. There is now a better option: www.SubaruGears.com
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ALIKA T3
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PostPosted: Sun Feb 26, 2012 10:57 am    Post subject: Reply with quote

Domo wrote:
If you have a Subi conversion, forget the UN1. There is now a better option: www.SubaruGears.com


It depends on many factors:where you live and how much money you got in your wallet.

You can find a good UN1 in Europe for 150 euros.....,adapter plate is easy to make,shifter is easy to connect,but chassis crossmember has to be cut,which is a big thing.
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ALIKA T3
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PostPosted: Wed Jun 20, 2012 8:46 pm    Post subject: Reply with quote


Link

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Subaru EJ22+UN1 5 speed transmission
http://www.thesamba.com/vw/forum/viewtopic.php?t=416343
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presslab
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PostPosted: Wed Jun 20, 2012 10:29 pm    Post subject: Reply with quote

Alika, what ratios/R&P does the UN1 in your van have?
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ALIKA T3
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PostPosted: Wed Jun 20, 2012 10:53 pm    Post subject: Reply with quote

presslab wrote:
Alika, what ratios/R&P does the UN1 in your van have?


Hi Presslab,

I have the UN 1-03 model

1st 3.36
2nd 2.05
3rd 1.38
4th 1.04
5th 0.82
Reverse 3.55
Ring and pinion 3.89 (9x35)

I almost never use the 5th gear,it's already really good with 4 gears,I can push the 4th at 100 Mph

Gotta do a video starting from zero Mph,it's freaking amazing how "long" it pulls Razz

Cheers
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PostPosted: Thu Jun 21, 2012 9:00 am    Post subject: Reply with quote

ALIKA T3 wrote:
I almost never use the 5th gear,it's already really good with 4 gears,I can push the 4th at 100 Mph


Thanks Alika! Smile

You have EJ22 engine, yes? So how would you say the power is in 5th gear? Can it hold 65 MPH on the flats? Are your tires stock size?
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PostPosted: Thu Jun 21, 2012 9:05 am    Post subject: Reply with quote

syncrodoka wrote:
http://ultimate-engineering.co.uk/renaultun1.html


Does anyone know if this is the only source for pre-made parts for this swap?
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PostPosted: Thu Jun 21, 2012 9:11 am    Post subject: Reply with quote

Holy crap, is that speedo in mph?

I'd leave a brown trail in my seat if I got my van to a 100.
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