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Old 08-28-2007, 02:46 PM   #1
MMastro
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Default '02+ steering rack in '00 by swapping pinion valve assemblies?

I'm swapping my entire '02 wrx engine and suspension into a '00 RS. Now many people use the RS suspension in there swaps and just change the PS lines. However, since I want to use the RS steering column with the WRX rack/suspension that won't work.. Many people modify their universal joints to mate the two, but my question is why hasn't anybody done this...

We pulled the "pinion and valve assembly" (#27 in wrx manual diagram below) as well as the one from the RS and they appeared idenitcal... So we then swapped the RS one into the WRX "valve housing" (#22 in diagram) and it fit in fine. Has anybody done this? Is there any reason why this shouldn't be done? I've heard time and again that these steering racks are the same, so why don't people do this instead of welding together the u-joints?

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Old 08-28-2007, 04:11 PM   #2
sidewayz
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why are you bothering to swap the suspension over????
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Old 08-28-2007, 04:32 PM   #3
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I have brand new KYB AGX's, Eibach lowering springs, & sway bars from my totaled wrx...
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Old 08-28-2007, 11:34 PM   #4
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still don't see why you don't want to use the rs rack ?
is the wrx a better ratio?
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Old 08-29-2007, 01:44 AM   #5
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I believe the 04 STi rack is a slightly better ratio.

05+ is idea... but they're attached to the crossmember
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Old 08-29-2007, 01:53 AM   #6
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I did that cause mine went and the only one I could get was 02 WRX and it works fine for me.
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Old 08-29-2007, 02:29 AM   #7
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Quote:
Originally Posted by moss View Post
I believe the 04 STi rack is a slightly better ratio.

05+ is idea... but they're attached to the crossmember
What do mean they're attached to the crossmember? You can still remove the rack just like the older style...
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Old 08-29-2007, 02:41 AM   #8
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er, sorry, the mounting points are different?

I forget now...i just had this conversation . All I know is you need the entire 05+ STi crossmember to put the rack into a GC or anything older than 05.
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Old 08-29-2007, 08:43 AM   #9
MMastro
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I believe it is the same ratio. The reason was to use the WRX suspension, hubs, etc because it is in much better shape than the RS stuff which is rusted, corroded, and beat up from 210,000 miles and Rhode Island winters. Also the wider track width... hopefully rubbing isn't an issue.

The point also is why is almost everyone (except for trowa) modifying their u joints if they could do this instead?
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Old 08-29-2007, 09:34 AM   #10
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you can still use the wrx suspension/hubs/subframe with the RS rack the tie rods ends have enough adjustment for the extra width ... what you won't be able to change is the strut top mounting point ... which isn't that big of a deal ...

i would speculate that you may have been the first as opening up the rack is kinda scary .. care to do a write up on it?
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Old 08-29-2007, 10:29 AM   #11
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good idea indeed. how much do you have to take apart on it?
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Old 08-29-2007, 12:01 PM   #12
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Well trowa did it first apparently, and actually my buddy (a Honda guy) really did it not me... He removed the power steering lines from the valve housings, unbolted the valve housings and removed the entire assemblies 21-31 from each rack. Compared the assemblies and they appeared identical, so he then gently wiggled the RS one into the WRX rack. T11 x2 is all that is required for removal/assembly minus whats needed to get the hard lines off the housings.

Jaxx, that would have been good to know before we went this route... we compared the tie rod + steering rack lengths and it was shorter so we decided to try this instead because we were afraid the geometry may be screwed up.

Last edited by MMastro; 09-06-2007 at 10:46 AM. Reason: updated
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Old 01-28-2008, 09:25 PM   #13
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Bump... curious to hear how this is working!
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Old 01-29-2008, 09:56 AM   #14
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Well I still have an alignment or steering issue of some sort (along with clutch slippage, a fuel tank pressure sensor code, a leak in my charging system)...

Before I got an alignment I had some uneveness in the feel throughout the range; being worse with the tires on the ground. I would describe it somewhat similar to post # 4 here: http://forums.nasioc.com/forums/show....php?t=1418388
We guessed it was probably air in the system which was somewhat likely as fluid was low when we first started driving it to work out the bugs. Since I got the car aligned the steering appears to have memory, as in if I make a hard right the car pulls to the right for a while when I return the wheel to straight. I was told by a knowledgeable friend it may be alignment, probably castor issue... Maybe the wrx control arms changing the suspension geometry? I post my alignment specs on one or both of these threads once I scan them so maybe some can make some sense out of what my issue is...
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Old 11-17-2009, 09:33 PM   #15
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MMastro I wanted to say thank you for posting this information. You just solved a future issue in one of my swaps
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Old 11-17-2009, 09:49 PM   #16
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No problem... I've done my fare share of research on these forums over the years and thought I'd share some useful knowledge for others.

For anyone else that finds this thread it has worked like a charm for 2 yrs now and the steering issue was entirely due to torn strut top mounts from the previous owner not using conical washers...
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Old 11-17-2009, 09:55 PM   #17
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If I remember correctly the steering racks from all the 90's legacy/impreza/forester were essentially the same so this mod should work for those as well.

Now I wonder if say an 05 STI rack is the same as the 02 WRX rack - in other words for example could I use a 90 Legacy pinion valve setup on an 06 STI rack?
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Old 11-17-2009, 10:21 PM   #18
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In the online parts catalogs the pinion valve assemblies are listed for the year ranges '02-'04 wrx, '04 Sti and '05-'07 wrx seperately, but the price is exactly the same for the wrx pieces. I think I remember reading STI's are a slightly quicker ratio so those may be different gears. I don't know where to look up part numbers for anything after '02 , but for '02 WRX and '00 2.5RS the part numbers are 34117FE010 and 34117AC010 which are pretty similiar
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Old 11-18-2009, 12:46 PM   #19
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Ciper- The 90 legacy crossmember wont accept an 05' sti rack as mounting points are different. However an 04' sti rack is a different story as it's the same mounting design as the 93-05 impreza/wrx
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Old 11-18-2009, 02:12 PM   #20
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Just make sure when you do that everything is shimmed correctly. I took one apart for a project for a cheaper quick rack and the pinion is shimmed to height so just make sure it is close or you will have slop in the steering.
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Old 11-19-2009, 02:16 PM   #21
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I love it when old threads spring new life. I've always woundered about this but not enough the do a search. Now I def. want to do this.
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Old 11-19-2009, 06:23 PM   #22
ciper
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Quote:
Originally Posted by JRach View Post
Ciper- The 90 legacy crossmember wont accept an 05' sti rack as mounting points are different. However an 04' sti rack is a different story as it's the same mounting design as the 93-05 impreza/wrx
Thank you for the information. I didn't intend to use a Legacy crossmember though...
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