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Old 08-08-2007, 12:37 PM   #1
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Default WRX turbo info thread

Since i'm using a WRX turbo in my build, and have seen a few people asking about it since i started investigating it, i'm starting a thread for info about it. not much to look at right now, except the compressor map in this post, but i'll be updating this as i do my build, and hopefully will also be able to answer any questions future kit-builders have as well.

compressor map
Name:  wrxcompressormap.jpg
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Old 08-08-2007, 12:40 PM   #2
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some basic info, as you can see form the map, it's a td04h-13t mitsu turbo.

i'll post another map a little later with some points on it showing where you are in the map for some common boost levels with 1.6's and 1.8's.... just need to get some time. :-)
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Old 08-08-2007, 01:34 PM   #3
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Thanks for the info...or as you might say..."wicked ahhhsome"
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Old 08-08-2007, 01:38 PM   #4
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Driven both a 1.6 and a 1.8 with the WRX turbo, on an ETD manifold.... It's a great combo to work with the miata motor. Spools well, and seems to keep pulling to the top.

NOTE: It's a 3 bolt flange, so either a custom manifold, or adapter will be required.

This is with around 7 or 8 psi.....

Dave,
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Old 08-08-2007, 02:25 PM   #5
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yeah, my next post was going to be about how much of a pain in the *** this is on me from a manifold and flanging perspective... :-)
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Old 08-08-2007, 02:42 PM   #6
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well its sort of designed to be basically a remote turbo, since it is so far downstream on the exhaust. Still, I will never understand why subaru used that flange for their turbo. Cheap little thing to replace though, you will find an endless supply of them for $100 or less on ebay all day long. BTW, i owned a wrx for about a year and tinkered a little on it.
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Old 08-08-2007, 02:52 PM   #7
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Quote:
Originally Posted by akaryrye View Post
well its sort of designed to be basically a remote turbo, since it is so far downstream on the exhaust. Still, I will never understand why subaru used that flange for their turbo. Cheap little thing to replace though, you will find an endless supply of them for $100 or less on ebay all day long. BTW, i owned a wrx for about a year and tinkered a little on it.
yeah, the flange choice makes no sense... but the manifold flange isn't a tough problem to solve. slice one off a stock up-pipe and there ya go.

the downpipe side is a lil tougher, though. The stock downpipe is a grade A craptastic piece. the flange more or less just covers over the wastegate flapper opening and creates what has got to the the worst flowing downpipe i've ever seen. the aftermarket upgrades are all "bellmouth" but they're expensive and cast, so they don't really make for a good diy chop-style experience like the manifold side flange does...

i'll have a decent writeup of what i do for a DP once i sort it out, though.
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Old 08-08-2007, 07:32 PM   #8
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I too am going to be using the WRX turbo on my build. My turbo and manifold are currently at BEGi as they are making an adapter to adapt it to my BEGi T3 manifold. Can't wait to see how it works out, I have a feeling its going to be a great turbo for my 1.8
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Old 08-08-2007, 07:50 PM   #9
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Quote:
Originally Posted by devin mac View Post
the aftermarket upgrades are all "bellmouth" but they're expensive and cast, so they don't really make for a good diy chop-style experience like the manifold side flange does...
Are you saying that all the aftermarket WRX downpipes are cast? If you are, then I'm 100% sure that you're wrong.
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Old 08-08-2007, 07:51 PM   #10
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When I built my WRX system, the outlet flange for the turbo was the easy part. My exhaust guy had them in stock (he did a lot of custom Subie stuff), unfortunately, he is no longer in business...

I made the inlet flange myself with a drill press, pretty easy really.

I'm pretty happy with it overall, and my setup (6psi) is faster than my buddies BRP M62 blower setup (7psi).
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Old 08-09-2007, 03:49 PM   #11
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Quote:
Originally Posted by firedog25 View Post
Are you saying that all the aftermarket WRX downpipes are cast? If you are, then I'm 100% sure that you're wrong.
nice productive post. thanks.

no, I'm not saying they're ALL cast. Well, actually, i did. But i was over generalizing. Most of them are, however. The bellmouth and flange on the vast majority of them are cast (i haven't see a bellmouth DP that doesn't have a cast bellmouth/flange section yet, so feel free to enlighten everyone with a link or something of substance).

Karter, that's good to hear. I wonder if begi would be willing to offer a downpipe flanged for this...
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Old 08-09-2007, 07:26 PM   #12
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devin, I would recommend contacting them while they have mine there so they could possible make duplicates. I'm having him build me a downpipe as well, so if you want one now is the time!
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Old 08-09-2007, 10:55 PM   #13
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yeah, i sent an email earlier today, so i'm hoping to catch the right timing. :-) maybe i'll send a PM here as well. cover as many bases as possible, right? :-)
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Old 08-11-2007, 07:53 PM   #14
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the best thing about the wrx turbo is that is designed to be efficient at high boost levels/moderatre cfm ....at 12 psi and fairly low CFM levels compared to a 2 liter the WRX turbo is a winner..quick spool and good efficiency at high boost...what more could you want. You can see that in the compressor map which is "tall and skinny" compared to other maps ive seen.....Oh and i used the older subaru"VF10" found in JDM Legacy/liberty GT turbos. will probably swap to a newer wrx turbo when it dies.
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Old 08-11-2007, 08:48 PM   #15
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Quote:
Originally Posted by devin mac View Post
nice productive post. thanks.

no, I'm not saying they're ALL cast. Well, actually, i did. But i was over generalizing. Most of them are, however. The bellmouth and flange on the vast majority of them are cast (i haven't see a bellmouth DP that doesn't have a cast bellmouth/flange section yet, so feel free to enlighten everyone with a link or something of substance).
The only cast one I've seen is the APS one, the rest are made from tubular. Maybe the flange is cast on some of them, but like I said, the only full on cast bellmouth I've seen is the APS unit.

http://www.z1auto.com/prodmore.asp?m...ust&prodid=602

http://www.z1auto.com/prodmore.asp?m...st&prodid=1020

http://www.z1auto.com/prodmore.asp?m...st&prodid=2031

http://www.z1auto.com/prodmore.asp?m...st&prodid=1321

This looks cast though.

http://www.z1auto.com/prodmore.asp?m...st&prodid=1493

The flange shouldn't be hard to come by, hell most performance shops that deal with the WRX installations will have piles of stock downpipes lying around. One place was clearing all of their junk out about a year ago and you could get that stuff for damn near nothing. I've seen stock WRX turbos go for $50 as well. Another good source to get used WRX and STi turbos is www.jdmspecc4u.com , I got my aluminum control arms from them. Great prices and good guys to deal with. I guess they get whole, cut in half cars because they also offer interior junk.
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Old 08-11-2007, 09:06 PM   #16
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MY FREIND HAS A 2001 WRX AND MANAGED TO UNDERSTEER IT INTO A CURB (whoops caps) and bent the lower control arm...he freaked out when he learned that it was TWICE the cost of a chrysler 300C arm!!!
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Old 08-13-2007, 10:54 AM   #17
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firedog, the second link is cast ;-)

ok, so they're 50/50 cast and tubular. in any case, i'll update this thread with whatever i do for a downpipe, so anyone else who wants to go this route can have something to imitate.
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Old 08-13-2007, 11:05 AM   #18
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If you're going to hack up a downpipe and want the bellmouth I'd suggest hitting up ERZ. They're by far the cheapest non-used Suby exhaust manufacturer on the market. It looks like they started selling their wares on eBay, I never bought any because it kind of seemed like cheap rubbish to me. THey've since become a vendor on NASIOC.com and I don't think anyone has said anything bad about them yet.

Also, 4sfed5, the inherent handling dynamic of Subaru's is understeer. It's really not that hard to shove one into a curb. Too many people think all wheel drive is about sideways rally heroics and wicked 4 wheel burnout drifting. I personally know of at least three people who have totally their WRX's because of this false thinking and thinking all wheel drive will be their savior, and one of them died because of it. I've completely changed my suspension to neutralize the handling some for when I go charging through the canyons. I know I went WAY off topic here, but FYI I've done the following.

1. Prodrive springs on stock struts since they were engineered for them.

2. STi Aluminum control arms.

3. Group A aluminum endlinks.

4. Whiteline steering rack bushings.

5. Whiteline 22mm front and rear sway bars (incl. poly bar bushings).

NVH is significantly increased, handling MUCH sharper. However in corners the rear end can be unsettled by potholes into oversteer. THere's a particular corner down the street from me that I literally bounce the rear end around. Key is to stay on throttle, to go from the wheels that slip to the wheels that grip you need throttle.
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Old 08-13-2007, 12:55 PM   #19
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Quote:
Originally Posted by firedog25 View Post
If you're going to hack up a downpipe and want the bellmouth I'd suggest hitting up ERZ. They're by far the cheapest non-used Suby exhaust manufacturer on the market. It looks like they started selling their wares on eBay, I never bought any because it kind of seemed like cheap rubbish to me. THey've since become a vendor on NASIOC.com and I don't think anyone has said anything bad about them yet.

Also, 4sfed5, the inherent handling dynamic of Subaru's is understeer. It's really not that hard to shove one into a curb. Too many people think all wheel drive is about sideways rally heroics and wicked 4 wheel burnout drifting. I personally know of at least three people who have totally their WRX's because of this false thinking and thinking all wheel drive will be their savior, and one of them died because of it. I've completely changed my suspension to neutralize the handling some for when I go charging through the canyons. I know I went WAY off topic here, but FYI I've done the following.

1. Prodrive springs on stock struts since they were engineered for them.

2. STi Aluminum control arms.

3. Group A aluminum endlinks.

4. Whiteline steering rack bushings.

5. Whiteline 22mm front and rear sway bars (incl. poly bar bushings).

NVH is significantly increased, handling MUCH sharper. However in corners the rear end can be unsettled by potholes into oversteer. THere's a particular corner down the street from me that I literally bounce the rear end around. Key is to stay on throttle, to go from the wheels that slip to the wheels that grip you need throttle.
5 bucks says youre a member of the maic?
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Old 08-13-2007, 02:52 PM   #20
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Quote:
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5 bucks says youre a member of the maic?
I am. But I just sold my FXT so I'm turbo Subyless though I have an '03 Outback as a DD.

Frank
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