WHAT TRANSMISSION COULD REPLACE UN1 ? - Page 6 - LotusTalk - The Lotus Cars Community
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post #101 of 106 (permalink) Old 04-05-2018, 08:15 AM
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Only question here is how much are you willing to spend???

1. Audi - tends to be the least expensive. Sub $5K for a workable 6 speed 01e, for example. Good for up to 450hp/tq with reasonable treatment. Scott at Advanced Automotion can pull this together for you. Advanced Automotion

2. Porsche - more expensive. Sub $8K-10K for a workable 930 box. Good for a chunk more hp/tp than the "breathed on" 01e (perhaps 500-550).

3. Others - quite expensive. ZF seems to be the most commonly available with good parts supply and some repair/support. Most of these options are in the $10K-20K+ range.

It's easy to talk a big game about how this or that transaxle can easily handle big HP....right up until you have to write a $15K check for one.

Who here has paid $15K+ for a transaxle?
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post #102 of 106 (permalink) Old 04-09-2018, 04:05 PM
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WHAT TRANSMISSION COULD REPLACE UN1 ?

The 2 workable solutions for someone to actually offer a kit for Esprits to replace a UN1, rather then each person having to custom fabricate a solution each time are:
Option 1 the cheap, plentiful and robust enough for this application is the Audi FWD 6 speed boxes.

Option 2 is making the Boxter gearbox work in here. Way cheaper then the vintage Porsche options previously used. Plentiful enough and already designed to be mid engined transaxle. Can handle the power, upgrades available, lots of clutches etc...

Whoever offers the first bolt on kit for either of these options would result in a bunch of orders at first and then a continuous stream of ongoing ones as the years went on.
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post #103 of 106 (permalink) Old 05-17-2018, 08:20 PM
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[QUOTE=Beerman;5774705]Only question here is how much are you willing to spend???

1. Audi - tends to be the least expensive. Sub $5K for a workable 6 speed 01e, for example. Good for up to 450hp/tq with reasonable treatment. Scott at Advanced Automotion can pull this together for you. Advanced Automotion

2. Porsche - more expensive. Sub $8K-10K for a workable 930 box. Good for a chunk more hp/tp than the "breathed on" 01e (perhaps 500-550).

3. Others - quite expensive. ZF seems to be the most commonly available with good parts supply and some repair/support. Most of these options are in the $10K-20K+ range.

It's easy to talk a big game about how this or that transaxle can easily handle big HP....right up until you have to write a $15K check for one.

Who here has paid $15K+ for a transaxle?[/QUOTE---------------------------
I know this isn't the right place to put this, but I couldn't find how to post a new question. I have a Vixen RV that uses a Renault UN-1 Transaxle, having a 4.11 final drive. Mine blew up and I cannot find another one. Is there another transaxle I can use in my Vixen? It must be rear engine/pusher configuration, not mid-engine. My new "built" BMW engine stripped out the ring and pinion and blew 5th gear right out the back case. Any help would be highly appreciated. [email protected]
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post #104 of 106 (permalink) Old 10-21-2018, 06:26 PM Thread Starter
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Quote:
Originally Posted by Foxedupone View Post
The 2 workable solutions for someone to actually offer a kit for Esprits to replace a UN1, rather then each person having to custom fabricate a solution each time are:
Option 1 the cheap, plentiful and robust enough for this application is the Audi FWD 6 speed boxes.

Option 2 is making the Boxter gearbox work in here. Way cheaper then the vintage Porsche options previously used. Plentiful enough and already designed to be mid engined transaxle. Can handle the power, upgrades available, lots of clutches etc...

Whoever offers the first bolt on kit for either of these options would result in a bunch of orders at first and then a continuous stream of ongoing ones as the years went on.
How about 2005 Porsche 911 Carrera 3.6 RWD 997 Manual 6 Speed Transmission G97.01 ?
Anyone?

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post #105 of 106 (permalink) Old 03-07-2019, 04:57 AM Thread Starter
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Possibility: Porsche G50/52 ?

Food for thought only:

How to shorten G50 tranny, details:
Converting long G50 into short g50 - Pelican Parts Forums
.
http://slc-wiki.squarespace.com/porscheg50
'
The G50/52 gear box from the later 964 could take 360HP and I can imagine some tuner taking it to 400HP. Each new version of the G50 was improved on from the 1987 which in 88 got a new fork etc.
many of them are being put into midengine kits cars like the FF GTM Mulsanne or the Ultima. For midengine, the gearbox needs to be inverted to run the other way around. It requires moving the drain and vent to the opposite side of the gearbox. Also, if the gearbox has a pump and internal oiling it also requires moving the pickup of the pump to the opposite side as well.

The other modification is a hefty billet side cover, which even on the turbo and other 9" ring gear boxes is nice to have.

Spec for G50/52
964 (965) Turbo 1991-94

5-speed fully-synchronized transaxle

Manufactured by Getrag

Plate-type limited-slip differential available

Rod shift

Single-plate clutch

Gear ratios:

1st gear: 3.154

2nd gear: 1.789

3rd gear: 1.269

4th gear: 0.967

5th gear: 0.756

Ring and pinion: 3.44, 9" ring gear

Last edited by MRDANGERUS; 03-07-2019 at 07:00 AM.
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post #106 of 106 (permalink) Old 03-07-2019, 08:36 AM
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The problem with the air cooled transmissions I think is that they are very expensive and getting more rare. I think you can buy a boxster trans for $1500? A rebuild able G50 is probably north of $7K - rebuilt over $10K?

94 Esprit S4 - Silver
Previous - lots of hot rod Air Cooled 911s
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