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Porsche Crest TURBO 4 speed to G50

Hi all I am trying to find out if anyone has done the turbo 4 speed -G50 conversion.. what to look out for and what is needed.. Paul

Old 11-23-2014, 04:15 PM
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Crotchety Old Bastard
 
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Typically it starts with a saws-all, torch and welder. I recall someone on the board did the swap with minimal chassis damage, could have been a short bellhousing or possibly a specific type such as the G50/00. Hopefully they will chime in.
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Old 11-23-2014, 04:42 PM
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There are options that don't involve modification to the torsion tube. I think Patrick Motorsports is one source for machined/shortened bell housing g50. Probably others too.
Old 11-23-2014, 05:00 PM
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I did it but notched my torsion tube. I'll post some picks tomorrow. You will need the following
g50 donor parts
Pedal cluster
Transmission
Slave and master cylinder
Shifter assembly and shift rod
I think trans mount also.
I bought a complete donor car and sold the engine. Ended up with the car less engine for $2500

Think you'll need clutch and flywheel too.
Old 11-23-2014, 05:19 PM
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Option to not cut torsion tube is a shortened bell housing and input shaft.

I jumped on my comp so here are some pics.







Old 11-23-2014, 05:31 PM
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Do not cut the torsion tube!
It's structural and the backbone of the car.

The best conversions I've seen have used a g50 with a shortened bell housing and input shaft. It's an expensive proposition. Personally I would keep the 4 speed. You can always change the gearing. I currently have an 88 930 4speed and an 89 930 with a g50/50.
I re-geared the 4 speed with a taller first gear and it's great. The g50 is an improvement but likely not worth the time $$'s and effort to convert.
Just my opinion
Old 11-23-2014, 05:52 PM
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The guys that work on my car have 2 G50/50 units if you are interested
Old 11-24-2014, 04:27 AM
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The factory makes it the G50 torsion tubes in 3pieces. As long as you brace and support. You car will be fine.

Quote:
Do not cut the torsion tube!

It's structural and the backbone of the car.



The best conversions I've seen have used a g50 with a shortened bell housing and input shaft. It's an expensive proposition. Personally I would keep the 4 speed. You can always change the gearing. I currently have an 88 930 4speed and an 89 930 with a g50/50.

I re-geared the 4 speed with a taller first gear and it's great. The g50 is an improvement but likely not worth the time $$'s and effort to convert.

Just my opinion
Old 11-24-2014, 04:38 AM
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The way you did yours looks good to me and with the roll cage tubes welded to the tops of the trailing arm pickup points it looks like you made it stronger than it was.
Old 11-24-2014, 06:50 AM
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Quote:
The guys that work on my car have 2 G50/50 units if you are interested
$?
Old 11-24-2014, 08:34 AM
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Blast for the street/track:
- standard 1987-89 Carrera transmission
- shorten it -- no cutting the chassis
- bolt in the Carrera G50 pedals, hydraulic reservoir & lines, shifter
- minor mods to clutch slave line and shift coupler
Done. Excellent close-ratio gears for the street.
Have tortured these with engines making 700hp/600tq and 335-width sticky tires. It holds up fine.
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Old 11-24-2014, 10:19 AM
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With or without the billet diff, Chris?
Old 11-24-2014, 12:11 PM
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Porsche Crest Turbo 4 speed to G50

Thanks for all the input... Chris where do I obtain parts to shorten transmission... I would prefer to go this way then cutting up the car... I already have pedal box, shifter, slave cylinder and all lines... I will still be running my 3.4 Twin turbo Flat fan EFI engine in this as I am pulling out of putting it into my Speedster..
Old 11-24-2014, 12:25 PM
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Did I hear flat fan? What?
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Old 11-24-2014, 12:29 PM
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Ship us the bell housing and mainshaft, we can shorten it.
Or ship the whole gearbox and we can go through it, replace what needs replacing.

If you need a long 5th gear for cruising, we routinely install the Turbo 5th.

Yes -- a good Limited Slip Differential (LSD) is essential, and at this age most factory ones we've seen are so worn down that you cannot even measure the breakaway torque -- you can just grab the output flanges and twist them opposite directions. Most can be rebuilt, or, just upgrade to a better diff (Wavetrac, Guard).

Lots of torque?
Add a stronger side cover plate.
Prep it for oil cooling if you think you'll get into track driving, then it's ready to add a pump and cooler at any time.
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Old 11-24-2014, 12:38 PM
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I did the G50 with shorten bell housing conversion - no chassis modification.

I did not notch torsion tube, nor did I weld any new mounting brackets for the transmission mount. Can swap back my 4-speed at any time.

Btw, Chris knows his stuff
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Old 11-24-2014, 12:58 PM
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Turbo 4 speed to G50

Hi Chris I am in Melbourne Australia so it would be a bit hard to send trans over to you ... can I buy the parts and have it done locally I have a great Porsche technician here
Old 11-24-2014, 01:24 PM
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Hi Totle

Totle where did you get the parts from to shorten the transmission... also what power would you be making with your combination... I am also looking at swapping out my camshafts and going for the GT2 grind did you experience any issues with this combo
Old 11-24-2014, 02:45 PM
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A really sharp cleaver.
Old 11-24-2014, 03:10 PM
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I'll find out price tom. Tippy

Old 11-24-2014, 06:49 PM
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