dot Posted July 29, 2004 Share Posted July 29, 2004 I changed over to the STI/WRX power steering rack and pump. On the good side I hauled off on the steering to make the car swing out of the garage and nearly took out the pillar. It is a very responsive system. On the bad side the system hums. It’s not loud but it is there. It is noticeable on even the mildest of turns. But makes no noise going straight. I put in the recommended Dextron II fluid but I suspect it may be wrong. The lines are now shorter and bigger (3/8â€) than stock so I doubt that is the problem. Anyone else had this happen? Quote Link to comment Share on other sites More sharing options...
mark Posted July 29, 2004 Share Posted July 29, 2004 I'm still a long ways off but I do have the rack on the car. I wonder if you could post a pic or diagram of the line routing for the rack. I have the WRX maunal on my PC but The line routing is kind of vague in the manual. Did you do anything to limit the travel of the rack? Looks like the wheels will turn in to my inner fender wells without some kind of travel limit. Thanks, Mark Quote Link to comment Share on other sites More sharing options...
dot Posted July 29, 2004 Author Share Posted July 29, 2004 Hey Mark: This should help. I use a small offset so my wheels don't hit anything. I does turn sharp! Quote Link to comment Share on other sites More sharing options...
mark Posted July 29, 2004 Share Posted July 29, 2004 Thank you!!! You would think that the FSM would have that diagram. Again Many Thanks. One more question, did you use the stock datsun steering shaft and datsun connector to the attach it to the rack? Mark Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted July 29, 2004 Share Posted July 29, 2004 about the hum, is it as loud as a Ford power steering pump. I the hum of a ford!! Quote Link to comment Share on other sites More sharing options...
dot Posted July 31, 2004 Author Share Posted July 31, 2004 I used the Z shaft shortened about 2 or 3 inches. (NOTE: I lined things up this is not a true measure) I had to purchase the u-joint assemble from the dealer and welded it on. The u-joint assembly is made of hardened stamped steel. These things are pricy from the dealer so try and get one from the P&P. Drill it out to 15mm, slide the Z shaft in and weld. The Z rack shaft and Subaru rack shaft have a different spline count. Quote Link to comment Share on other sites More sharing options...
mark Posted July 31, 2004 Share Posted July 31, 2004 Thanks for the info. That puts me one step closer! Quote Link to comment Share on other sites More sharing options...
dot Posted July 31, 2004 Author Share Posted July 31, 2004 I changed the fluid to an Autopar power steering fluid and the noise is gone. It is now completely silent. I have been driving around all day this P/S system is great. Lots of road feedback too. Definitely worth all the time and effort. Quote Link to comment Share on other sites More sharing options...
datsunlover Posted August 1, 2004 Share Posted August 1, 2004 Yah but don't you loose som HP from running that P/S pump dot? Oh wait.. Jag V12.. like it matters right?!? Good to hear it worked out for ya. Sooo.. yuor cruisin in the Z eh? Hmmm.... Quote Link to comment Share on other sites More sharing options...
ToplessZ Posted August 1, 2004 Share Posted August 1, 2004 I have yet to see the final work on this. What are the exact years and models this peticular rack can be taken from I really want to do this swap. Thanks for the drawings too. Quote Link to comment Share on other sites More sharing options...
dot Posted August 1, 2004 Author Share Posted August 1, 2004 The rack and pump I used are from a ’98 Impreza. There is a part number change from 2001 and 2003. I don’t know why for sure. I think it might have something to do with the speed sensing pump. For the tie rods, you can use the ZX inners ( p/n EV 164) and two right side outers from an early Z but you will have to drill and thread the rack ends. I chose to cut metric threads on the Subaru inner tie rods as the EV 164’s were unattainable and use the stock Z tie rods. Use the EV 164 parts if you can get them. It’s an easier way to go. For reference my car is a ‘71 Quote Link to comment Share on other sites More sharing options...
mark Posted August 1, 2004 Share Posted August 1, 2004 Dot, I used the same tie rods as you and would have to say I would have a machine shop drill and tap the rack if I had it to do over again. Hard metal!! but it turned out OK. I did some checking of my factory service manual and it calls for DEXRON yes DEXRON (that is how it is spelled in the manual) III fluid. Hope that helps but sounds like you have it figured out. Thanks for the info. Mark Quote Link to comment Share on other sites More sharing options...
dot Posted August 3, 2004 Author Share Posted August 3, 2004 Hey Mark: I have to thank you for posting the pics of your P/S swap a while back. It saved me a lot of fabrication time. Those were the “blue prints“ I needed to get the swap done…Thanks. Quote Link to comment Share on other sites More sharing options...
Guest 2slo4u Posted August 3, 2004 Share Posted August 3, 2004 Just wondering why you guys changed over to the sub. rack? Does it respond quicker than the zx? Is it smaller or lighter? Just curious. Maybe if my impreza bites the dust, I'll keep the rack. 81zxturbo 95slobaru impreza Quote Link to comment Share on other sites More sharing options...
mark Posted August 4, 2004 Share Posted August 4, 2004 Glen, Glad to hear I was able to help you. Makes me feel better knowing what I'm working on will work. I'm using the Sub rack because it is very close in size and mounting points as the stock rack. I'm old and need PS and it is very quick when compared to the stock rack. Mark Quote Link to comment Share on other sites More sharing options...
zgeezer Posted November 16, 2004 Share Posted November 16, 2004 Thanks folks. I don't know why my search w/n pick up on the STI/WRX. Santa's little elves will be visiting our favorite JYs this weekend. g Quote Link to comment Share on other sites More sharing options...
Tony D Posted November 16, 2004 Share Posted November 16, 2004 To clarify, this is for a swap into an early S30 model, and not a replacement for an S130 unit, correct? Quote Link to comment Share on other sites More sharing options...
drunkenmaster Posted November 17, 2004 Share Posted November 17, 2004 Is there any chance of a brief "how to" and any traps found. Also updated links ot the pictures would be great Thanks Quote Link to comment Share on other sites More sharing options...
mark Posted November 17, 2004 Share Posted November 17, 2004 Go here for a few pics http://hybridz.org/photopost/showgallery.php?cat=500&ppuser=8092 Quote Link to comment Share on other sites More sharing options...
drunkenmaster Posted November 17, 2004 Share Posted November 17, 2004 Thanks for the pics, however I was under the impression the crossmember did not need to be cut to fit the subaru rack, yet you have cut it in several places. The one that would be the biggest concern to me is the chunk taken out of the engine mount support. Also I wonder how crucial the actual positioning of the rack is from left to right in relation to the steering system geometry? Thanks Quote Link to comment Share on other sites More sharing options...
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