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Old 05-05-2002, 09:47 PM   #1
Legacy GTR
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Question Swaping internal wastegates

Hey guys, I want to upgrade to a WRX turbo but don't want to run 8psi (or whatever) everyday. I was talking to a DSM friend of mine and he said to see if I could take the wastegate off the WRX turbo and put on the wastegate from my RHB5 turbo (5psi spring). Looking at the turbo's he has it was 2 bolts and a cottor pin. Looking at my RHB5 it was 2 bolts, but instead of a pin in looks like a spot weld or something. Something more permenent anyway. I know that the rods would have to be the same length and shape for this to work, but has anybody tried, or can shed some light on this for me?
Thanks,
Mike
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Old 05-05-2002, 09:59 PM   #2
Legacy GTR
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Oh, I have that 90* elbow on the turbo inlet, could I use that on the TDO4?
Mike
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Old 05-05-2002, 10:35 PM   #3
Graham
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As far as swapping wastegastes, you could probably do it, though you might have to do some modification to the actuator rods and mounts for the wastegates. When I initially set up my turbo (RHB5) I had to clock the turbo. This also resulted in having to relocate the wastegate, and we ended up having to drill an extra hole in the wastegate mount (there's only two screws for it) for it to fit. I do know that the wastegate mount for the TD04 is somewhat bent/not flat like the ones found on the Legacy turbo's. You may find some problems in trying to adapt these two together.

I have been considering the same upgrade as you, but finding the right springs for the turbo's is somewhat of a setback. I don't know of anyone who makes different internal wastegate springs for IHI turbo's, so I sort of gave up. Another option is obviously to use an EBC, or put on an external wastegate. For this, the internal wastegate on the turbo would have to be welded shut (that little gate) and/or disabled.

If you find anything out, let me know.

Oh, I am not sure if the 90 degree elbow will fit or not. I ended up not using mine, as the fabricator just made a custom mount for me instead. I doubt that the intake inlets on the two turbo's are the same size, but you could probably build some sort of a step-up to compensate.


Graham
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Old 05-05-2002, 11:13 PM   #4
Legacy GTR
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What are those rods made out of? If it's weldable I could cut the rods, put the RHB5 spring side and reld it to the rod on the TDO4. I would just get an external wastegate but half the reason I was going to do it was because i'm installing a FMIC, and figured it would be a good time. But I don't have the money for an external wastegate right now. Oh well.
The outlets are the same size. I'm not sure what that size is, but the intercooler is made for the WRX and the pipe that fits on the outlet fit on the RHB5 just fine.
Mike
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Old 05-06-2002, 10:44 AM   #5
subachad
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Have you considered an external wastegate?

Chad
93 1.8T
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Old 05-06-2002, 03:52 PM   #6
inpreza kid
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is it possible to cut the wastegate spring?
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Old 05-06-2002, 07:04 PM   #7
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Quote:
Originally posted by inpreza kid
is it possible to cut the wastegate spring?
don't do it

Brad
knows what not to do
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Old 05-06-2002, 07:31 PM   #8
inpreza kid
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i got my wrx turbo today. the rod that connects to the wastegate is ajustable but i don't know what the range is.
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Old 05-06-2002, 10:17 PM   #9
Graham
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Its adjustable? Are you sure about that?

I have heard of "shimming turbo's", which consists of shortening the wastegate actuator rod, but I'd be weary of doing anything like this, as you never know what ramifications it may have.

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Old 05-06-2002, 10:59 PM   #10
SPeeDSiN
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never really understood what shortening of the rod would do. could anyone elaborate?
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Old 05-06-2002, 11:19 PM   #11
inpreza kid
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this is just a GUESS but if you shorten the rod it will cause the wastegate spring to tighten up. this will cause the wastegate to bleed off at a higher boost pressure than before.

here's a pic. sorry for the quality. i'm not sure what the limits of the wastegate will be if you ajust the bolt.

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Old 05-07-2002, 12:08 AM   #12
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by adjusting that bolt you will by making it longer alwasy let the bypass bleed.... making it shorter would... umm well you can only make it so short.

I don't see how you'ld be able to fit like a legacy wastegate or anything else on there if you have ot clock the turbo though. for the simple fact that between the coolant feeds oil feed and where the position of the valve sits.... I don't see any room for it.
as far as I know the only option you have if you go the route of clocking the turbo is to weld the valve shut.

Brad
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Old 05-07-2002, 03:23 AM   #13
inpreza kid
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so would ajusting it longer or shorter make it bleed at a lower boost pressure?
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Old 05-07-2002, 09:21 AM   #14
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by making it longer you will bleed more exhaust gasses.


Brad
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Old 05-07-2002, 10:27 PM   #15
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Couldn't you also solve the problem, at least a temporary solution, by have your BOV vent while the TB is open, or would that just be counter-productive?
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