porsche 914 compared to 5 rib 2.0l vw box

68 bayman

hi
since getting my bay running under scooby power i now feel it needs more gears at the moment ive got the standard 1.6 box paired to the engine 2.2, ive just purchased a 5 rib 2.0l box and also looking at a 914(901)5 speed box from a porsche,is there much difference between the two regarding ratios , is it worth going through the hassle to convert the 914 or do i just stick to the 5 rib box , how much work would be involved to convert the 914, does the bellhousing detatch from the 914 would i have to change the input shaft and so on

all info would be appreciated thank you

13 window deluxe · Posted: Tue Jan 05, 2010 7:32 pm Post subject:

arnt the internals of the 5rib same as the 002 3 rib box but just in a stronger case?

the 6 rib 091 "cp" is the strongest & highest gear'ed stock bay box i would use one of those

i had one in my last bay and 70mph was just over 3500 rpm with 205/45/17 tyres that would be about 130mph on the redline with a scooby motor
_________________
1964 rat 13 window deluxe 1Z tdi,
1975 rhd twin slider tintop (TBA)
1991 golf 2 gti with tweaked AHU tdi,

previous tdi swaps: gone but not forgotten
1979 rhd twin slider tintop bay ahu 1.9tdi
1990 T25 1Z 1.9tdi
1993 suzuki samurai with 1Z 1.9tdi

68 bayman · Posted: Tue Jan 05, 2010 8:37 pm Post subject:

thanks for that mate
i feel like im no further forward hearing that the ratios are the same in the 5 rib as the 3 rib , do you know anything about the 5 speed 914 box regarding fitting and so on and the ratios OR do you know to a 091 6 ribber anywhere

regards keith

sven · Jedi Guardian Joined: 27 Dec 2006 Posts: 814

The boxes are almost the same in ratio according to the debates at Shoptalkforums.

STIDUB · Padawan Joined: 08 Oct 2009 Posts: 54

i found all the info i needed on the samba for bus boxes, perhaps look up bug@5speed on germanlook forums for the 914 etc porsche box info,

after weighing up my options i went with the 091 box, (both it & porsche gear arent easy or cheap to find here though) the only thing that it would of been nice to have is a 5th/6th gear BUT the 091 fits with torsion housing uncut Happy

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68 bayman · Posted: Tue Jan 05, 2010 11:19 pm Post subject:

thanks both of you for the info i will check both sites in the morning

Kai · Posted: Wed Jan 06, 2010 10:34 am Post subject:

I'm assuming you've already using an adaptor plate between your VW box and the Subaru motor?

A 901 and VW bus box should fit onto the adptor plate already. I'm not sure about input shafts through. especially not with an existing adaptor plate.

The Porsche 901 gearbox has a dog leg gear pattern for the forward gears. 1st gear is left and back as opposed to a more conventonal H pattern were 1st is left and forward followed by 2nd (left and back). I think reverse will be in front of 1st but I dunno.

Heres the germanlook how-to-article

http://germanlook.net/html/tech/Tech02Porsche5SpeedTrans.php

and

The bug@5spd write up

http://www.germanlook.net/forums/showthread.php?t=9153
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