hatch4x4 Posted March 2, 2004 Share Posted March 2, 2004 I just had a crazy low cost keep it simple idea for my Justy to convert it from 4wd to AWD. I was reading about different AWD systems focusing on the center diff, and found out that sometimes a coupling, either viscous or clutch based, is used to transfer power to the rear wheels. They went on to say that the following cars have something like this: Some subarus with automatic transmissions The upcoming Audi TT Quattro The Japan-only Nissan Pulsar GTi-R The old Honda Real-Time 4-wheel drive wagons Honda CR-V Nissan Skyline GT-R Porsche Carrera 4 and 95 VW Synchros I'm guessing most of the couplings are built into the tranny housing, but I am wondering if anybody knows of one that is seperate, maybe a little easier to custom fit into the justy... Just open thinking here I guess, maybe I will go to the JY and poke my head under some hondas and vw's.... -- Jeff Quote Link to comment Share on other sites More sharing options...
Guest taprackready Posted March 2, 2004 Share Posted March 2, 2004 The VW has had syncro around for quite some time but mostly in the Vanagon and quantam wagan platforms. Other models were like the golf were not US models and are extremely rare. Audi, abviously has had US versions forever and are famous for rally racing. Hoever I still believe all these models have the 4x4 system integrated into the transaxle. Both VW and Audi at least up until recently have had all the syncro/US model vehicles in north/south facing engine bays and NOT in the east/west oriented engine bays. Which means it won't work for the Justy. Bill Quote Link to comment Share on other sites More sharing options...
hatch4x4 Posted March 2, 2004 Author Share Posted March 2, 2004 I'm not looking to completely swap transmissions (yet ) but somehow adapt the limited slip coupling to my 4wd system, making it fulltime or all wheel drive. If I had the money and a little more in the engineering department, I would love to take a transverse mounted nissan or mitsubishi AWD system and make it fit in the justy. But if I could afford that, I'd probably just end up buying an impreza Quote Link to comment Share on other sites More sharing options...
WJM Posted March 3, 2004 Share Posted March 3, 2004 ALL AWD subaru 5spd transmission attached to an EJ engine had viscous center diffs. The autos have clutch packs, electronically controlled. Before the EJs....they were open diffs, or like the standard 4wd, OR, the FT4WD 4EAT auto trans had clutch packs like the newer AWD autos begind the EJ engines. Quote Link to comment Share on other sites More sharing options...
oddcomp Posted March 3, 2004 Share Posted March 3, 2004 amc eagles had a viscous coupled setup in the transfer case there was a company that made a small hub you bolted on the front out put of a transfer case inside it was a viscous coupler it was inteded for people who drive on and off road alot so they did not have to keep shifting in and out of 4wd it kept the drive lines from binding try writing a few of the 4wd magazine's to ask about it it would take some adapting but its kinda what your looking for i think Quote Link to comment Share on other sites More sharing options...
North Ursalia Posted March 3, 2004 Share Posted March 3, 2004 As a bit of additional information, I should point out that the center VC in the 5MT EJ series cars is housed in an extension case on the tail of the tranny. It is not internal to the tranny and can be removed with the tranny still in the car if you want to grab one from a junkyard to try out. They are also sealed VC diffs, so you don't really need the housing if you want to play with it, though the support and protection provided by the case is important. Quote Link to comment Share on other sites More sharing options...
hatch4x4 Posted March 7, 2004 Author Share Posted March 7, 2004 Those clutch packs in the autos, How self contained are they compared to how you described the viscous coupler out of the manual? I think it would be sweet to be able to "dial in" the amount of slip I need, but if it would require tons more fab work to integrate into my justy, forget it. -- Jeff Quote Link to comment Share on other sites More sharing options...
WJM Posted March 7, 2004 Share Posted March 7, 2004 i think maybe they are in an extension housing as well...BUT, in order to dial it in so fine like you say...would require lots of electrical work. As those trans only have 2 or 3 solinoids that control the TQ split, one for 50/50, 90/10, and one other one....i dont know what it did, or maybe i am mistaken out the third one. I dont know if you could go over 50% to the rear...that would be cool tho. I know that SUBARU stated in their sales information that the WRX autos have the TQ split at 45/55...."for a more sporty drive" or something like that. Quote Link to comment Share on other sites More sharing options...
dozer Posted May 19, 2004 Share Posted May 19, 2004 The optional hi-end transfer case in '95 ZJ's (grand cherokee) used a viscous center-diff. One big problem with that case: it didn't lock up in LO either! Which was kind of a drag off-road. Didn't start sending power to front until there was already a 5 or 15 (?) rpm difference between the driveshafts...which was usually too late <g> If you have one, and stand on the brake to smoke the rear tires, you'll burn up the viscous coupler. They're not meant to have an rpm difference across them for any length of time. It also prevents you from limping home on the front only...i.e. if you break a rear shaft, then drop the rear driveshaft to limp home. You can do that with a good ol' "locked" type t-case, but not with a viscous coupler. They tended to get burnt up by being towed too...until the tow-truck drivers all learned about it. I think you'd smoke the Subaru clutch-pack diff too, with sustained rpm-delta (slip) across it. Not enough heat-dissipation capacity... These center-diffs are basically meant only to slip for brief periods. To prevent 'windup' in the driveline on hard surfaces. Quote Link to comment Share on other sites More sharing options...
archemitis Posted May 19, 2004 Share Posted May 19, 2004 something that might make this doable, is using the turbo awd mitsubishi eclipse coupling, or tranny. its a side winder just like the justy, and it can handle some mean hp. made from 89-now probably. Quote Link to comment Share on other sites More sharing options...
hatch4x4 Posted May 19, 2004 Author Share Posted May 19, 2004 Man, this thread started so long ago... I changed plans (slightly) and am now working on getting the 160 horse Nissan SR20DE motor and the Japanese-only, SR20 powered, AWD GTi-R's tranny....... into the Justy I have managed to find the transmission so far, (they come imported on the turbocharged engines people keep tossing into their Nissans) and hold a value of next to nothing. I got mine for $100. Still, not bad for a < 60,000km tranny out of a '98... It's sweet too, electric speedo, hydraulic clutch, I mean this thing was begging to be put somewhere it wasn't supposed to go! As soon as I have some money to toss at the project, I should have an engine, and from there the fun starts! So far the only possible problem areas I have found, is that the engine and tranny are 1" longer than I have room for in between the frame rails. I have a few ideas that look plausible. The other thing is, the axle on the pass. side is going to be pretty damn short, I estimate the shaft's length to only be 4" or so. Before I invest some serious money though, I will find out if this is a very big problem. So yeah, anybody selling a roll cage for a justy Quote Link to comment Share on other sites More sharing options...
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