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Old 07-22-2005, 05:22 PM   #1
2.5rsDOHC
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Default 92 legacy sport turbo up grade

Im thinking of buying a 1992 legacy sport just so I'll have a car to drive while my 98rs is in the paint shop & getting the motor rebuit, I just happen to have a TD04 and wrx I/C just laying around so how difficult would it be to install these items and turn the boost up to like 14lbs. I was thiking that I could tune it with a apex SAFC but im not a tech type of guy so im not sure, it could be a bolt on for all I know.
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Old 07-22-2005, 06:24 PM   #2
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Well, you might head on over to bbs.legacycentral.org and see what we have going on. As for the TD04, it is not much better than the VF-11. The WRX intercooler will fit, but you have to modify the turbo to IC pipes. You can up the boost, but you will reach fuel cut before the 14lbs.
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Old 07-22-2005, 07:40 PM   #3
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The TD04 isn't really worth the effort. The WRX TMIC is worth the effort but it will take some massaging to make it fit. You'll need to shave the TB down about an 1/8"-1/4" and pound the firewall slightly. The throttle linkage for the cruise control can also be in the way of a BOV.

You'll need a FCD if you want to raise the boost over 13 psi at sea level. You'll also need a boost gauge and MBC. It is also pretty much useless to turn the boost passed around 11-12 psi without doing a TBE.

If you take the time to do the mods you'll probably fall head over heals for the car and never want to give it up. You've been warned.
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Old 07-27-2005, 02:04 PM   #4
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how much boost on the stock turbo is safe to get?
how much boost before i SHOULD get an I/C?
thanks
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Old 07-27-2005, 11:48 PM   #5
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Stock, you can run around 10-11 psi without too much worry. You'll still need the MBC and boost gauge though.
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Old 07-28-2005, 02:08 AM   #6
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What does 10-11 psi on the stock turbo and block put down to the wheels?
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Old 07-28-2005, 09:33 AM   #7
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Without supporting mods? Maybe 180 to the crank, so whatever that'd be to the wheels (also depends on the dyno). With a TBE and intercooler you might get closer to 190-200 chp but that's about it.
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Old 07-28-2005, 09:39 AM   #8
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I was running 15-16psi on the stock VF11 with other heavy mods (FCD, TMIC, 3" TBE ect..) and was pulling on stock to lightly modded WRX's and could almost hang with my buddies Evo 8 down low. Up high he walked away pretty fast though because the VF11 will drop off to about 11 psi after 4800 rpm.
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Old 07-28-2005, 02:26 PM   #9
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for turning up the boost to say 10psi, is it ok to use one of the cheap ball and spring MBC's that you find all over ebay and such?
what is the stock boost level anyway... i thought it was around 7 or 8
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Old 07-28-2005, 02:29 PM   #10
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also, is there a difference between the vf10 and vf11? i think the 10 was on automatics and the 11 was on manuals.. not sure though.
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Old 07-28-2005, 04:49 PM   #11
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Ya, one of those ball and springs would be fine. Don't touch your boost without a boost gauge being installed first though.

Stock boost is 8.7 psi

The VF10 came on the EJ20G with autos in Europe and Japan IIRC. We've only seen VF11's here in the states though. IIRC the difference is that the VF10 has a compressor wheel with 1 less blade and a larger compressor outlet to mate up with the AWIC setup on the EJ20G.
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Old 07-29-2005, 01:41 AM   #12
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8.7 eh? i just ordered an autometer boost gauge which goes from -30 to 20 psi cuz i assumed i will never be boosting more than that haha... any clues on an easy way too hook up the gauge to my engine? im sure there are instructions but it makes sense coming from another person whos done it..
sidenote: i also ordered a wrx 3" catless downpipe so now i need a cat-back...
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Old 07-29-2005, 02:33 AM   #13
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Stock boost on the turbo block (8.7) = 160 ish chp
7 psi on a NA block = 200 chp. (yeah I got dyno chart, 152 whp mustang dyno)

Of course its WAY easier to raise boost on the ej22t without breaking pistons than on mine! Don't I know it.....
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Old 07-29-2005, 09:02 AM   #14
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Quote:
Originally Posted by Natoe
8.7 eh? i just ordered an autometer boost gauge which goes from -30 to 20 psi cuz i assumed i will never be boosting more than that haha... any clues on an easy way too hook up the gauge to my engine? im sure there are instructions but it makes sense coming from another person whos done it..
sidenote: i also ordered a wrx 3" catless downpipe so now i need a cat-back...
T into the vacuum line that comes of the #1 runner on the intake manifold. It's the line that runs to the MAP. Then find a spot to run it through the firewall and run it to your gauge location. For the light, I'd wire it to the lighter light because it will work with the dimmer then. It's a very easy install. Good luck!
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Old 07-29-2005, 12:37 PM   #15
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heres the thing, what i think my number one runner vaccum is, isnt being used right now... i have a line going from the turbo that wraps around directly to the wastegate, i assume that that will let the wastegate open normal...
the vaccum line on the passenger side of the intake manifold is unused, can i plug directly into that to read boost?
thanks
you can kind of see what i mean:
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Old 07-29-2005, 03:11 PM   #16
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Ya, the nipple on the #1 runner that it looks like you have some tape around is the one you want.

Do you not have a MAP sensor? What ECU are you using?

Hooking the wastegate straight to the compressor outlet nipple on the turbo will cause you to run wastegate boost (around 5-6 psi on the VF11). When you get a boost gauge in you can put a MBC inbetween and raise the boost.
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Old 07-29-2005, 04:51 PM   #17
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yeah i have no MAP sensor because i am using the 1.8L ECU for now... hopefully it wont be too rough, and i can get some engine management things later. and yes, i am running it on wastegate boost level, so ill expect 5-6 once i get it driving. (it runs, but no exhaust, and control arm issues)
soon ill get a MBC and run it at 10 if thats pretty normal.
thanks
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Old 07-29-2005, 04:52 PM   #18
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...but can i still plug my boost gauge into that vaccum line???
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Old 07-29-2005, 05:27 PM   #19
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Quote:
Originally Posted by legacy92ej22t
Ya, the nipple on the #1 runner that it looks like you have some tape around is the one you want.
You want the one off the manifold that you're not using at all....
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Old 07-29-2005, 06:27 PM   #20
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awesome, thanks for the help

can you tell me what the turbo IAC does? matt monson said i should block it off since im using the 1.8 ECU, but what am i losing?
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Old 07-30-2005, 04:07 PM   #21
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It does the same thing as the EJ18 IAC. It's the idle control valve. If you don't have one the car will probably not idle very well (especially at start up) and when you go off throttle and the revs get lower it might stumble and be a bit eradic.

I highly recommend you pic up an ECU from '91-94 turbo Legacy and run it. Then you can run the OEM EJ22T IAC, boost controller (needs to remain hooked up to the ECU to run properly), MAP and MAF. THe car will run much better and you can push that ECU fairly easy.

My buddy has an EJ22T swap in an early Impreza too and he was having mad problems until he finally tracked down an EJ22T ECU and now his car runs great.
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Old 07-30-2005, 07:29 PM   #22
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hmmm, well ill try and track one down, but this setup is going to have to work for a while... it idles fine with the 1.8L ecu, havent drivin it yet though.

i just thought the IAC was different since the legacy one has coolant lines and a mongo breather coming from it (which i blocked off).

it didnt come with the boost controller hooked to the engine, but i can get an aftermarket cheap one.. but wont be hooked up to the ECU.
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Old 07-30-2005, 07:30 PM   #23
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i wouldnt need a different chassis harness right? just the engine harness and ecu..?
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Old 07-31-2005, 11:35 PM   #24
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The ej22t ecu freaks out if it doesn't have the proper sensors hooked up and won't run right without them. Even with a MBC you need a factory boost controller hooked up so it sees it.

I'm not a 100% sure about the harness situation. You'll probably have to wire the MAP and OEM bosst controller all the way to the ecu I would think. That's not that big of a deal though.
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Old 08-02-2005, 03:18 PM   #25
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any guess of how my ej22t will run on my 1.8 ECU then..? ive got it runnin and it feels good, but havent been able to drive it yet because of the suspension..
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