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Old 04-13-2004, 07:36 PM   #1
J.D.Hogg
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Member#: 59536
Join Date: Apr 2004
Location: WNC
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1988 GL wagon 4X4
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Default Suspension and turbo swap questions.

Well this is my first post here so howdy.

My first subaru as well.

Here's my story, I hope you find it at least amusing. I was scooting along a rather rough road known as Pinnacle Mountain Road in Western NC. I had heard for the last week what I thought might be the failing of one of my rear bearings. I know you don't have to tell me.

Going around a turn I heard the sound of a CV joint coming apart. After pulling over I noticed my right rear tire was up about two inches into the wheel well. Kicking it I confirmed my suspicions that the wheel had somehow come free of the suspension. Jacking it up and with a bit of effort I was able to tear it free. Rust had eaten holes around the hub and the noise had been the bolts slightly touching the inside of the wheel. The steel had torn around the frame exept for the top which allowed it to flip up and over to where the axle was spinning against the shock.

Now I've found a junker. It's an 86 with rear discs, while mine is an 87 with drums out back. the junker also has a turbo that seems to be spinning smoothly.

Now for the questions.

1 Will the these trailing arms/control arms fit my brakes (unlikely)?

2 Will these arms fit on my frame?

3 If compatible with my frame, is the brake cylinder properly proportioned for the discs Allowing me to replace both sides at once.

4 Should I?

5 Assuming it's in serviceable condition, is swapping the turbo practical?

6 aside from the obvious parts that connect to the turbo, what needs to be moved over? i.e. computers, plenum, throttle body, injectors?

7 Is the compression ratio of a non turbo significantly higher than a turbo model.

Any advise you have to offer is welcome. As well as any links to people who have experience with this issue.

Thanks in advance.

Edit: I forgot the details. My car- 87 gl wagon 5spd, non turbo, 4X4 manual transfer case with low range. The junker is an 86 with pushbotton 4X4 and a turbo motor. There was no indication of it being a GL10 which I had expected.
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Old 04-14-2004, 12:49 AM   #2
Flowmastered87GL
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Grab the entire rear trailing arm... the rear disk conversion is very popular and there are many ways to do it, but since you have rust issues back there, swap the WHOLE arm. dont worry about the brake perportioning... you can run these disks on a brat, a hatchback, a 94 loyale... pretty much any 4 lug subaru (except really old ones from the 70's and justys)

you have an 87... which type... carbed or SPFI? If its fuel injected you could rig up the turbo, but it would in all honesty be easier just to get a turbocharged subaru and drive that (so I wouldnt bother)

Carbed and EFI subaru engines have a higher compression than the turboed engines (I forget the ratios exactly)

There are 1 or 2 people running around on the USMB (www.ultimatesubaru.net) with a carbed block with a turbo on it...
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Old 04-14-2004, 01:00 AM   #3
J.D.Hogg
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It's fuel infected. SPFI? Sequential Port? I was under the impression that it all dumped into the throttle body but I haven't gotten too deep into it.

The junkyard sells everything by weight so I thought I'd grab the turbo setup for the hell of it, but I am more interested in a lower Compression ratio setup, what with the cost of premium these days. I also don't think I can afford to pull the pistons out right now to get em' machined.

I'm pretty sure that I'm going to take those parts anyway, so I'm still interested in what is unique to the turbo. They're going to crush it next week. Shame to let it go to waste.
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Old 04-14-2004, 01:06 AM   #4
subaru__styles
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when you take thoose rear control arms take the swaybar too!! the spfi has no rear sway bar.

as far as turbo motor in your car you would have to swap the whole wirring and computer over
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Old 04-14-2004, 01:18 AM   #5
J.D.Hogg
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1988 GL wagon 4X4
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Hmm.

Are you talking about that flat bar running behind the axles with a large rubber bushing on either end? The reason I ask is because I didn't notice a traditional sway bar on the junker. I have a feeling your talking about something that I didn't notice because my car has one of those cross pieces. Lemme' guess... to hold the differential in place?


Now about the wiring. Are you talking about all the wiring on the car or just the engine related harnesses. I can see the computer mounted on the firewall.

Are the injectors bigger?

Thanks for the help by the way.
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Old 04-14-2004, 01:26 PM   #6
Calebz
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Looks like your brake questions are covered, so i will stick to the turbo stuff

Yours sounds like its SPFI (single port fuel injection.) Which has a CR of 9.5:1. Turbos are 7.7:1.. they also have different heads, intake manifolds and exhaust manifolds

You have a few options. You can modify the the exhaust and such and put the turbo on your current motor. I don't know what all will be involved, but there will be a bit of custom Fab work to do it

Or you can use the turbo specific stuff off the turbo motor. this will be: Heads, intake manifold, exhaust manifold, up pipe, down pipe, ECU and all the wiring from motor to ECU. You will then have a 9.5:1 turbo motor.. its been done, but with mixed results.

Basically if you want to keep your motor and put the turbo stuff on it, all you will be keeping is your block.. everything thing else will have to be changed.

as far as the rear sway bar goes, its a plain old traditional sway bar.. the junker probably just didn't have one.. they aren't very common.. I have had 5 EA82 wagons (3 turbo) and only one has had the rear sway bar.

You said you saw the ECU on the firewall.. not sure what you actually saw there, but the ECU on those cars is located under the dash by the steering column (under the rear parcel shelf on an XT)

Its a big project and you can expect some down time while its done. definitely not for the faint of heart or anyone without an FSM with all the various wiring diagrams.

Also, given that the turbo is an 86 and your car is an 87, you will need the distributor and airbox/MAF from the turbo car as 85-86 is different from 87+

Quote:
Are the injectors bigger?
Competely different.. yours has one injector in the TB, whereas the turbo is MPFI(multi point fuel injectio) it has 4 injectors seperate from the TB

Oh yeah.. and don't forget the engine crossmember.. you will need the one from the turbo car.
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Old 04-14-2004, 07:50 PM   #7
J.D.Hogg
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Well thanks.

I found the car I was referring to, to be a few feet flatter than it was yesterday. Luckily they had another turbo wagon with discs out back that they are pulling aside for me. I going to abandon the turbo conversion idea but maybe I'll grab just the turbo body for future projects.

Are these turbos on ball or needle bearings, or do they require oil pressure to spin freely like the newer ones? Just want to know what to look for.
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Old 04-18-2004, 05:19 PM   #8
subyrally
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the tubo swap isnt htat hard, well, im not sure about the ripping out of the oldstuffs, but ibuild an '86 rx from the firewall foward, i had to rewire the engine and dash, i swapped everything from a gl-10 wagon into the rx. it wasnt too hard, it was how i learned how to work on subies.
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Old 04-18-2004, 06:27 PM   #9
J.D.Hogg
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1988 GL wagon 4X4
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Thanks for the encouragement, but I've since found that the rust on my car would make it impractical to spend that much effort on something that will rot away in a few years.


Funny thing. I went back to the junkyard and started working on the one they set aside. The car had been sitting so long that the axles were rusted onto the shafts. After removing the pins I preceded to beat on the cups for half an hour. By the time I was done they were oval but hadn't moved a millimeter.

I got the parts from Speedy's, a local used parts vendor. Installed it without a hitch.

Thanks everybody.
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