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Old 05-13-2015, 06:39 PM   #1
mrsaturn7085
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Default 2005-2007 STi Steering Rack Pressure and Return Line Thread?

I have been working on coming up with a braided hose kit for the 05-07 STi power steering system and have been having some difficulties determining what thread the 05-07 STi steering rack high pressure and return line fittings used.

Anyone have one of these sitting around and able to check? The two fittings in question are on the left side of the following image:

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Old 05-13-2015, 08:33 PM   #2
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I can't guarantee this is correct, but I think the threads are 14x1.5mm for one, and 16x1.5mm for the other. A few months back I was able to crosscheck an '04 WRX rack and a '15 STi rack and both had the same threads, so I'm assuming they have used the same compression nuts for all years in between...which may or may not be true.

You'll want to make sure to use o-ring fittings like these

http://www.summitracing.com/parts/FRA-491970/

http://www.summitracing.com/parts/FRA-491970/

edit: Here is a helpful write up
http://www.rs25.com/forums/f105/t185...ing-lines.html
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Old 05-13-2015, 08:39 PM   #3
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Default 2005-2007 STi Steering Rack Pressure and Return Line Thread?

One M14x1.5 fitting and one M16x1.5 fitting. Both are the o-ring flare fittings (male) as shown in your post #1 photo.
Freshly measured re-measured off rack(s) I had around:
2004 STI rack
2006 WRX rack
2007 STI rack
2002 Forester rack

Last edited by JarHarms; 05-14-2015 at 08:59 PM. Reason: updated with new info
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Old 05-14-2015, 11:45 AM   #4
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Thank you so much! I will be posting a write up similar to the RS25 one soon, except it will have a few... upgrades (?) to the guide. I am running a JDM steering cooler, and this 'kit' should bolt right up when complete!

JarHarms - PM'ed; I see you have an '06 WRX. I was under the assumption that the WRX used female connectors and the STI used male on the rack itself.
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Old 05-14-2015, 06:12 PM   #5
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Here's one more - high pressure banjo fitting on the P/S pump... anyone know the thread of the banjo bolt, or better yet, the short spacer between the banjo and the pump itself?

I believe it to be either M16x1.5 or M18x1.5 - the RS25 guide says M14x1.5 O-Ring... but then he uses a non-o-ring adapter... so I'm hesitant to buy without checking.


Last edited by mrsaturn7085; 05-14-2015 at 07:35 PM.
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Old 05-14-2015, 07:44 PM   #6
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Quote:
Originally Posted by mrsaturn7085 View Post
Here's one more - high pressure banjo fitting on the P/S pump... anyone know the thread of the banjo bolt, or better yet, the short spacer between the banjo and the pump itself?

I believe it to be either M16x1.5 or M18x1.5 - the RS25 guide says M14x1.5 O-Ring... but then he uses a non-o-ring adapter... so I'm hesitant to buy without checking.

Hey Stephen,

Maybe you'd be interested in one of these for that connection: Link. I have to think that MSI went the route of custom machining for a reason.

Jacob
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Old 05-14-2015, 07:58 PM   #7
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Jacob - wrong fitting. That custom fitting is for the vacuum line from the reservoir. I do not plan to replace this as the Subaru line is plenty sufficient here.
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Old 05-14-2015, 08:03 PM   #8
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I have one of the HP banjo bolts in my hand now. Looks like 14 x 1.5.
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Old 05-15-2015, 11:26 AM   #9
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As long as you've got the banjo out, any change you could take the spacer off the pump and check that, as well? I *think* it will be the same, but I want to see if it has an o-ring.
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Old 05-23-2015, 02:58 PM   #10
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Progress - I ordered 9 feet of hose. I expect to use 7-8 feet but it's not *that* expensive and I'd rather just pay shipping once.

It will be a while before I finish this install but I did make one *minor* mistake. I should have installed one 45 deg end and one 90 deg end first and worked my way back from the rack. The tricky part is going to be routing (may need a few ADEL clamps) and attaching the hose to the OEM steering cooler. I have the fitting (3/8" hard line to -6AN male - Earl's AT165064) but it's gonna be messy and I *might* need to cut the barb off the OEM pipe to get the olive over it.

One side note - P/S fittings are a royal pain to install, and even worse is cutting the hose. They aren't difficult like "maybe I need to take it to a shop" difficult... but you'll easily break a sweat.





Rack fittings appear to be 45 deg and 90 deg:





And the motivation for new lines:


GDB Spec C models used entirely different power steering lines. They *do* fit the LHD USDM rack, but they are nearly $300 with a good imported, and aerospace lines should be under $200 total. You can use the USDM lines as well, but you'll be using a decent amount of zip ties to attach them to the manifold.

Last edited by mrsaturn7085; 05-23-2015 at 03:12 PM.
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Old 05-26-2015, 03:38 PM   #11
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For some reason I couldn't see the pictures before. Now I get it. Are you sure that Earl's fitting is rated for the pressure it will see?

Jacob
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Old 05-27-2015, 01:50 PM   #12
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Are you talking about the return pipe fitting or the adapter fittings for the rack?
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Old 05-27-2015, 03:19 PM   #13
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You referenced Earl's AT165064 in post #10. That type is not very strong, but then, I know you've done your homework.

Jacob
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Old 05-28-2015, 03:59 PM   #14
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Quote:
Originally Posted by renob123 View Post
You referenced Earl's AT165064 in post #10. That type is not very strong, but then, I know you've done your homework.

Jacob
You are correct - this part *might* work, but the pipe on the OEM steering cooler is actually 10mm, not 3/8". Since this is a return line, pressures should be will be ~25 psi or less. I am working with the company that made some of the Group N fittings for Prodrive now. Due to the time difference, it takes some time to ask a question and get a reply, but the bottom-line is, if they didn't make the power steering fitting for this tube, I think Goodridge did (p/n HL831-06, sometimes listed as HL831-06D). Very similar to the Earls part I purchased, but designed for a 10mm pipe rather than 3/8". It is still a -6AN male barb.



My new issue is learning that the 16mm x 1.5 o-ring adapter that attaches to the rack line may be too deep (male threaded nut bottoms before o-ring contact). Fragola and Russell make alternates, but I have seen that the Russell is an equal depth to the Earls. I'll pick up the Fragola fittings this Friday.

I disassembled the spacer on the P/S pump last night. The top bolt is M14 x 1.5 banjo, and the spacer is M14 x 1.5 w/o-ring (NOT a GM/Saginaw style bump/power steering fitting!). Most companies make one of these in aluminum, Goodridge makes one in steel (p/n 306-06-M14). If I retain the spacer the OEM pump uses, I'll use a crush washer; if I go straight to the pump, I'll reuse the o-ring.
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Old 06-17-2015, 11:32 AM   #15
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Glad I found this thread, I'm about to do the same, for the exact reason.

I'm a bit stuck on the adaptors needed for the rack. they are M14/M16 x 1.5 but all the adaptors I've found, appear to be too long vs the stock nut/thread depth...
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Old 06-17-2015, 12:33 PM   #16
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What year and trim level of rack are you modifying?

The M14x1.5 female to -6AN male adapter should be okay, but the M16x1.5 female to -6AN male is likely too deep. The Earl's parts are of significantly quality than the Fragola. Honestly, I'd be shocked if the M16 adapter leaked considering that line is more-or-less flow without pressure.

I've more or less put this on hold until I get additional parts. FWIW that HL831-06D will work with the OEM steering cooler but you need to take the barb off the pipe with a cut-off wheel.

So, a complete list of parts would be:

Cooler kit:
34620FE120 (Subaru Japan); Spec C Steering Cooler Kit
34630FE001 (Subaru Japan); STI/Spec C Steering Cooler Reservoir

Supply hose:
130006ERL (Earl's); p/s hose, 4.5 ft (cut to length)
139106ERL (Earl's); 90 deg end
134606ERL (Earl's); 45 deg end

Supply adapters:
9894DBH (Earl's) or 491970-BL (Fragola); M14x1.5 female o-ring to -6AN male
871406 (XRP) or 306-06-M14P (Goodridge); M14x1.5 male to -6AN male (SEE NOTE 1)

Return hose:
130006ERL (Earl's); p/s hose, 4.5 ft (cut to length)
130106ERL (Earl's); straight end
139106ERL (Earl's); 90 deg end

Return adapters:
9894DBJ (Earl's) or 491971-BL (Fragola); M16x1.5 female o-ring to -6AN male (SEE NOTE 2)
HL831-06D (Goodridge); 10mm pipe to -6AN male (SEE NOTE 3)

NOTE 1 - Use XRP part w/washer if retaining OEM spacer; use Goodridge part w/OEM o-ring otherwise.
NOTE 2 - Part may need to be modified.
NOTE 3 - Cut barb off OEM steering cooler pipe before use.

I have located the source for the TRUE Group N components that were used instead of 9894DBH/9894DBJ/HL831-06D... but the price is over 200 USD including shipping for those three adapters from the UK. I'll take some pictures when they get here mid-July. I found they were also the source for the 8mm pipe to -6AN adapter for OEM Spec C fuel rails on the Group N cars... priced at 60 USD ea. Picked up 4 of those, as well.

Last edited by mrsaturn7085; 06-17-2015 at 12:42 PM.
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Old 06-17-2015, 04:46 PM   #17
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Hey mate,

I'm doing this on a 2012 WRX STi.

Will look into what I can do with the M16x1.5 adaptor...
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Old 06-17-2015, 08:53 PM   #18
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Actually, I just realised the adaptors I'll need are slightly different as our cars are RHD so we do not have the cross over hard line with the male ends like you guys do.

For the supply hose on the rack itself I just need this
http://www.summitracing.com/parts/fr...9-bl/overview/

Return hose off the rack
http://www.summitracing.com/int/part...8-bl/overview/
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Old 06-18-2015, 12:51 PM   #19
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That is correct - however, I would get Earl's parts. Quality is a little better. I have a spare if you need one!
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Old 06-22-2015, 03:48 AM   #20
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Thanks for the offer mate, I had to order some gear from Summit so just chucked that in the order..

Huge thank you for the guide and info... been searching all over for what size fittings etc are used on the rack
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Old 06-22-2015, 11:54 AM   #21
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Not a problem. When I get the actual Group N parts mid-July, I'll post up some comparisons. I am debating on waiting until I get a 13:1 LHD rack before I install the lines and intake manifold. Seems like it would be easier to do it all at once.

With regards to the supply side adapter (at pump), I just got my Goodridge part today (~$20... spendy one!). Between the 4 possible parts to use here (XRP/Fragola w/washer or Goodridge/Earls w/o-ring) the steel Goodridge adapter is clearly the best option. The Earls and XRP have a step on the inner diameter, and the Fragola visibly has inferior machining vs. the other three. If you prefer the crush washer option, the XRP is still a decent choice if you don't mind the step on the inside diameter. It is not a large enough difference to cause any type of venturi effect.


Goodridge, Earls, XRP, Fragola

On the high pressure side, I'd prefer to keep everything steel anyhow to prevent any leaks due to differences in expansion rates when the pump/engine heat up. I'm not sure if the Group N rack-side adapters were aluminum or steel, but I'll know in a few weeks.

Last edited by mrsaturn7085; 06-22-2015 at 04:40 PM.
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Old 07-03-2015, 10:46 AM   #22
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Just to confirm the fitting on the power steering high pressure side, it is also a M14x1.5?

I'll go with the goodridge steel fitting too
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Old 07-03-2015, 11:57 AM   #23
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Yes - if you are talking about the pump side. Retain the factory o-ring if you remove the extension piece on the pump.
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Old 07-03-2015, 12:04 PM   #24
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I'll have a look and see whether i'll keep the extension or not. on the 2012 STi, the high pressure outlet is on the side of the pump not on the top next to the return like the earlier models so I'll see what will work best..
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Old 07-04-2015, 01:21 PM   #25
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My instructions are purely for the GD platform. You should make a new thread for your platform and do some research! I'm people would appreciate it!

FWIW the additional parts I've bought and haven't used have cost under $40, so you certainly won't break the bank!
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