924Board.org

[kcoyle]

I'm kind of a wuss and don't want to cut the WG actuator line for a MBC. The fittings appear to be metric and not NPT. Is there anything I can use to install the MBC without cutting the WG line?

I was thinking maybe I could use an old fuel line from a CIS car cut in half to install the MBC.

Or should I just cut the damn thing already?

KC
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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.

[Rasta Monsta]

Just cut it. When your car is ready for Concourse, you can have it rebuilt by any competent hose shop.
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Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[kcoyle]

I slapped this together in the garage tonight. Couldn't get it to work consistently on the bench. I think I might bite the bullet and get a real one like yours. Does the boost "T" come with smaller diameter barbs? It looks like you had to adapt the WG line to a smaller diameter hose.

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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.

[ideola]

Why cut a perfectly good stock part, especially one that is NLA (even if it can be repaired later by a competent hose shop).

A better solution is to get one of these, put it between the charge tube and the boost cutoff switch, and plumb the vent line of the controller to the top of the wastegate. Remove the mushroom style vent port up top and use one of these with a standard 12mm banjo bolt.

Related reading.
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erstwhile owner of just about every 924 variant ever made

[kcoyle]

I read that whole thread and I prefer the method of applying pressure to the top of the wastegate (failsafe) but I'm under the impression that it's extremely annoying/difficult to get to the top of the WG. I would have to remove the WG, yes? I have to admit I didn't crawl under the car to check it out.
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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.

[ideola]

Yes, you do have to remove the wastegate. Remove the j-pipe (two nuts on mani and four nuts on wastegate). Unbolt the wastegate from the dump pipe (four nuts). Disconnect the control line (one banjo bolt). Unbolt the torque-tube-mounted bracket (two nuts).

Of course, if you have old nasty rusty hardware, that always adds to the fun. It does require a little bit of maneuvering to wiggle the wastegate out once you have it loose, but it's really not that bad of a job.

Do you have any interest in an in-cabin boost controller???
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erstwhile owner of just about every 924 variant ever made

[kcoyle]

[Rasta Monsta]

[kcoyle]

Dan,

Did this work for you to avoid cutting the line?

"Thanks Min! I ordered one each of the M12x1.5-to-1/8NPT and M14x1.5-to-1/8NPT bushings from egauges.com. There is actually a male-to-male M14-to-M12 reducer between the actuator line and the charge tube, so both sizes are needed. I'll then pick up some cheap 1/8" NPT to 1/4" hose barb fittings from the local hardware."
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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.

[ideola]

Yes.

Earlier I had ordered the adapter bushings that Min referenced, but decide it was a cleaner install to go on the cutoff switch side, plus I want the extra protection of plumbing the vent line back to the top of the wastegate and not interrupting the stock control line function.
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erstwhile owner of just about every 924 variant ever made

[kcoyle]

Cool, thanks. I will steal that idea then and add Rasta's boost "T"
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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.