2006 Noble M400 #141

[Goat Blower]

I'd try backing off the preload on the wastegates. I did that to my Green last summer and I seem to remember that at one point, I lost all boost as well, didn't really make any sense.

[Mnementh]

Silly question: Did you drive up here for the Mitsu cookout last August or was that ANOTHER Noble?!?? o_0

(I didn't take pics of it and can't remember if it had MN plates or not...)

[asshanson]

I'd try backing off the preload on the wastegates. I did that to my Green last summer and I seem to remember that at one point, I lost all boost as well, didn't really make any sense.

It doesn't make sense, but I'll try that too. That was really the only thing I changed related to the turbos, so it's entirely possible. But it will boggle my mind if that actually works.

Silly question: Did you drive up here for the Mitsu cookout last August or was that ANOTHER Noble?!?? o_0

(I didn't take pics of it and can't remember if it had MN plates or not...)

Yea, that was me.

[Goat Blower]

It doesn't make sense, but I'll try that too. That was really the only thing I changed related to the turbos, so it's entirely possible. But it will boggle my mind if that actually works.

I'm still new to internal gates surprisingly, I had an external already on my car when I bought it back in 1999. Much easier overall, but now I like the stock look. :D

[turbotalon1g]

sorry to hear of the issues my friend.

[asshanson]

So far I've tried unplugging the wastegate actuator boost lines, backing off the extra preload I had added, tried loading the stock tune which had crappy driveability, none of them fixed the boost issue.

Next step, remove both intakes and downpipes from the turbos. I'll be checking to make sure both wheels on both turbos are spinning together, not broken, etc.

[turbotalon1g]

Just an FYI since I have not been keeping up to date with this.
But when I had a similar issue my wastegate arm was disconnected from the flapper.

[Kracka]

Just an FYI since I have not been keeping up to date with this.
But when I had a similar issue my wastegate arm was disconnected from the flapper.
Brown might be on to something here. I had a similar issue once too; the preload eventually fatigued the flapper mechanism enough where it started to warp and eventually break off. The symptom was similar to yours: drove fine except no boost. Giving them some additional preload like you did might have been the straw that broke the camel's back. How old are the turbos?

[Goat Blower]

Time to get out the JB Weld. :D

[asshanson]

They might be 5000 miles old, or 2 years. These BW EFR turbos haven't been out that long, but it could have been a manufacturing defect. When I have the downpipes off I'll also be checking to see if the flappers are still there inside the turbine housing, and that they look like they're sealing.