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Old 04-27-2014, 05:03 PM   #1
justdrive
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Default swapped turbos, now I gots no boost

As some of you might know my turbo let go last week, and thanks to Shane here on Turbobricks, I got a unit sent to me yesterday.

spent the day swapping it out, installing my wastgate actuator and a few things....

Fired it up, tightened up the oiling line, let it get some temperature in the unit, backed it out the drive........ SLOWLY added gas..... no boost.
I thought I might have a hose loose.... I did, tried again, Nothing.....

As soon as it gets anything close to boost, the motor bogs, and looses power.....

Any guesses????
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Old 04-27-2014, 06:23 PM   #2
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Boost leak?
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Old 04-27-2014, 06:29 PM   #3
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gotta be a boost leak my first guess
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Old 04-27-2014, 06:30 PM   #4
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What turbo?
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Old 04-27-2014, 06:45 PM   #5
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Mitsubishi 13.

I suspect its a leak, I just can't figure out where.

I THINK everything is tight..... I try to figure it out after 7 or 8 beers
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Old 04-27-2014, 07:51 PM   #6
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Wastegate actuator set up right? I can guarantee it's not an issue with the turbo, that thing would hold 12psi no problem before I swapped the 15g on.
Since it didn't have that issue before, and the turbo is a known good unit, I would check over every little thing you touched/moved/removed and make sure there's no issues there. First things I would check are the WG actuator, turbo inlet/outlet hoses, and pcv hose that is routed into turbo inlet hose on both ends. I'm sure you've just got something loose and you'll figure it out.

Last edited by turbotankshane; 04-27-2014 at 07:59 PM..
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Old 04-27-2014, 08:07 PM   #7
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WG actuator
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Old 04-27-2014, 09:57 PM   #8
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Where's your amm?
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Old 04-27-2014, 10:23 PM   #9
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Is this the same thing that was the reason for putting the old turbo back on?

I if all hoses are tight. Check you I/C. Could have a hole in it.
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Old 04-27-2014, 10:42 PM   #10
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What's my AMM???
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Old 04-27-2014, 11:04 PM   #11
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Air mass meter
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Old 04-27-2014, 11:05 PM   #12
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Quote:
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What's my AMM???
You might not have one, but seeing how you so graciously gave us all the information on what you are driving, we don't know.
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Old 04-28-2014, 07:09 AM   #13
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So sorry, 1990 745 turbo.

Mass Air Meter is by the Air cleaner.

One thing I did that might have caused a problem....when I removed my wastegate actuator, I pumped the rod... a bunch of oil came out, so I kept pumping until all the fluid was out...... did I damage the diaphragm?

thanks for all your input on this
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Old 04-28-2014, 07:22 AM   #14
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eh maybe, but probably not. if you damaged the diaphragm it would have runaway boost, not zero boost. you've got a leak somewhere.
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Old 04-28-2014, 07:42 AM   #15
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If you had a lot of oil in the wastegate diaphragm that turbo pushed all that oil in there. I did notice on my 13 Mitsubishi that the diaphragm is very weak. I would also look at the compressor bypass valve to make sure its not just cycling boost right back into itself
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Old 04-28-2014, 07:44 AM   #16
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Quote:
Originally Posted by midnightsaint View Post
Is this the same thing that was the reason for putting the old turbo back on?

I if all hoses are tight. Check you I/C. Could have a hole in it.
No, the turbo was replaced because the bearing let go. up until that time, the car produced plenty of boost.

Intercooler is fine......
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Old 04-28-2014, 07:47 AM   #17
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Quote:
Originally Posted by bigreddog View Post
If you had a lot of oil in the wastegate diaphragm that turbo pushed all that oil in there. I did notice on my 13 Mitsubishi that the diaphragm is very weak. I would also look at the compressor bypass valve to make sure its not just cycling boost right back into itself
is that the thing on the outlet? where the vacuum line goes to the manifold????
I had to swap that because the one on the new turbo was damaged in shipping. can I install that wrong??
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Old 04-28-2014, 09:06 AM   #18
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Quote:
Originally Posted by bigreddog View Post
If you had a lot of oil in the wastegate diaphragm that turbo pushed all that oil in there. I did notice on my 13 Mitsubishi that the diaphragm is very weak. I would also look at the compressor bypass valve to make sure its not just cycling boost right back into itself
cbv was verified working properly, unless damaged in shipping.
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Old 04-28-2014, 09:15 AM   #19
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Now when I say I bogs, I mean it BOGS. It's seems there is no fuel or spark.... But when I back off the gas the RPMs come back if I mash the gas, nothing, flat above 2500....but if I slowly let the RPMs build it will spin past 4500 before it fattens out.....
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Old 04-28-2014, 09:20 AM   #20
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you've got a leak dude
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Old 04-28-2014, 10:42 AM   #21
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I think I figured it out, the turbocharger was shipped without the band holding the cartridge together. I'm going to remove mine from my turbo and put it on the new one.

You would think the band would've been on the turbo.
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Old 04-28-2014, 10:54 AM   #22
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hm. I suspect you'll find additional issues, unless the turbo fell out of the front of the housing (and the lines, waste gate, and other things kinda hold it in place) that's not very likely to be the sole reason you have no boost. Also, would be excessively loud if that were the case, but either way, good catch. I've had the bolt that holds the clam on break before, and lost the clamp that way, it may not have been something the seller did on purpose.
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Old 04-28-2014, 11:25 AM   #23
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I WAS THE CLAMP.

Took of the clamp from my old one, put a breaker bar on the turbo to force the two halves back together..... Clamped them ..... BOOST.

Thanks for all your input....
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Old 04-28-2014, 11:26 AM   #24
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hope it didn't tear up the turbine wheel, don't use all the boost up at once ;)
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Old 04-28-2014, 11:30 AM   #25
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Yeah, hopefully the housing settled down on the wheel while it wasn't spinning very fast. *buzz saw sound effect*
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