Problem with Cobb turbo heat shield - VIBRATION FIXED (w/ pics) - Subaru WRX Forum
 
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#1 Old 08-27-2008, 11:35 PM
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Problem with Cobb turbo heat shield - VIBRATION FIXED (w/ pics)

After I installed my Cobb downpipe, Cobb turbo heat shield, and flashed to Stage 2, I started hearing a random rattle under my hood and I figured it was just wastegate flutter, but it turns out it was actually my Cobb turbo heat shield rubbing up against a metal line (for lack of a better description). I don't actually know what the part is called - maybe someone can tell me what it is from the pics I took - but I'm glad I found the problem because if I let it go, I'm sure it would have eventually punctured the line. Fortunately, without taking anything apart, I was able to neatly grind away a small section of the heat shield with a dremel tool to allow what I think is significant clearance between the two parts. I'm happy to report that my rattle is now gone. So, if anyone is thinking of buying and installing a Cobb turbo heat shield, just beware of this potential issue.
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#2 Old 08-28-2008, 06:36 AM
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how are you comparing a "rattle" to wastegate flutter??

Your rattle went away? But the wastegate flutter is still there right?

That thing your talking about looks like the wastegate arm but don't quote me.
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#3 Old 08-28-2008, 03:22 PM
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Manshow: I just checked my Cobb heatshield and it's different than yours!
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#4 Old 08-28-2008, 03:24 PM
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Hey, how much is that heatsheild?

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#5 Old 08-28-2008, 03:55 PM
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Quote:
Originally Posted by SuBeast View Post
Hey, how much is that heatsheild?
$50 i think

Yup here ya go: IAG Performance: COBB WRX TURBO HEAT SHEILD, Down Pipes, 512500
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#6 Old 08-28-2008, 03:59 PM
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See how it is already cut/shaped for you??

http://iagperformance.com/images/pro...age_01_600.jpg
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#7 Old 08-28-2008, 04:03 PM
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Damn, i could make my own heatsheild for like $10.... But then again it doesn't say "COBB" on it. It looks like man show got an early production COBB heatsheild before they fixed the problem???

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#8 Old 08-28-2008, 07:03 PM
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ya, mine came with the notch taken out allready.

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#9 Old 08-28-2008, 09:07 PM
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96 accord: Sorry, I didn't mean to compare wastegate flutter to my rattle. I honestly don't really know what wastegate flutter sounds like. Shortly after I upgraded to Stage 2, I noticed the sound and did a little reading on these forums and one of the most common answers I got was, "The sound you're hearing is most likely wastegate flutter," so I just assumed that's what it was. The rattle that I was hearing before is definitely gone, but I'm sure there's still a little bit of wastegate flutter - I still don't know exactly what that sounds like. The thing my heatshield was rubbing against very well could be my wastegate arm - I don't know. And I believe your heat shield is different than mine. I just ordered my part from the cheapest place I could find it and assumed it would work. But shit happens and parts get mixed up, so I don't blame the company who made it or the place I ordered it from. Other than that one obvious point of contact, it seems to fit fine now.

SuBeast: Yep, I paid $50.00 for it from Boostbuddy.com Home Page and I think I had free shipping, but I can't remember. And yes, you can make your own turbo heat shield for less money, but I took the lazy way out because I preferred to have some bling under my hood - and it matches my downpipe, so that's my excuse. You can actually modify (cut) your stock turbo heat shield, but that thing is fugly in my opinion and I decided to keep mine in tact in case I ever wanted to put my car back to stock to sell it. I very well could have been sent an older version of the turbo heat shield, but I have no way of knowing. In a way, it was my own fault for not thoroughly checking clearances when I installed it. I'm sure I would have noticed how close it was to the metal tube, but I was just happy to have everything back together at the time.

zmanoside: Yeah, I wish mine had that notch taken out. It would have saved me a little trouble, but I think everything's good now. I'm glad you looked at yours though, because if your turbo heat shield was rubbing a notch in your metal line, I bet you'd be pretty happy you read this and I'd feel good for helping a fellow Subie out

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#10 Old 08-29-2008, 06:45 PM
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Wastegate actuator arm, BTW.
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#11 Old 08-29-2008, 07:23 PM
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yep that def. is the wastegate actuator arm. nice job wiht the dremel. its amazing the damage the heatsheild did to the arm. lucky you caught it before it made it any worse
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#12 Old 08-30-2008, 12:20 AM
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Cool, thanks.. I tried to take a picture of the dent in the arm, but I couldn't get the camera down far enough for a really good view. Even though the dent is about 1/4 of the way through the arm, it still feels pretty solid, so I don't think I'll have to replace it. Thanks for the info guys.

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