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FD turbo to downpipe nuts coming loose

Old 10-30-09, 10:22 PM
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FD turbo to downpipe nuts coming loose

Perhaps a silly question. I'm running stock twins on my racing FD. All of the fasteners (studs and nuts) and gaskets are OEM from Mazda. I'm having a tough time keeping the nuts holding the downpipe to the turbo tight. Any suggestions? Thanks in advance.

Guy
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Old 10-30-09, 11:35 PM
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are they torqued properly? maybe loctite them but with the amount of heat there i dont think i would. i dont run turbos so idk about the lcotite
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Old 10-31-09, 12:20 AM
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Yellow FD?

What kind of EGTs are you seeing?
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Old 10-31-09, 12:26 AM
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Can you double nut them? I did that to my Miata manifold....works for that.
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Old 10-31-09, 12:44 AM
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Gracer-7 yes, I have the yellow FD. As for EGT's I'm not sure as I don't have thermocouples up there. I don't think things are too hot as my tune is very conservative and I'm only running 12psi.

I do start off with the specified torque, but that only seems to last a while. I'm trying to avoid re-torqung between sessions on the hot turbos.

I'm using the stock nuts which are pretty tall so I don't think I can double nut them.

Do people use nuts from other manufactures? I know the BMW locking nuts are nice.
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Old 10-31-09, 11:58 AM
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Originally Posted by finger lock View Post
Perhaps a silly question. I'm running stock twins on my racing FD. All of the fasteners (studs and nuts) and gaskets are OEM from Mazda. I'm having a tough time keeping the nuts holding the downpipe to the turbo tight. Any suggestions?
http://www.nord-lock.com/default.asp?url=2.16.37

Don't use Nylocs, don't bother with Loctite. Double nutting helps -- you can get a thinner nut for the second one. I've seen Nordlocks in other high vibration locations used very effectively.
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Old 10-31-09, 12:39 PM
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Originally Posted by finger lock View Post
Gracer-7 yes, I have the yellow FD. As for EGT's I'm not sure as I don't have thermocouples up there. I don't think things are too hot as my tune is very conservative and I'm only running 12psi.

I do start off with the specified torque, but that only seems to last a while. I'm trying to avoid re-torqung between sessions on the hot turbos.

I'm using the stock nuts which are pretty tall so I don't think I can double nut them.

Do people use nuts from other manufactures? I know the BMW locking nuts are nice.
you're using the mazda lock nut and having back off? that's a first...

there is a little bar thing on the s4 t2's that goes in place of the washer, and you bend the tabs up and it physically locks the nuts down....
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Old 10-31-09, 07:40 PM
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Originally Posted by gkmccready View Post
http://www.nord-lock.com/default.asp?url=2.16.37

Don't use Nylocs, don't bother with Loctite. Double nutting helps -- you can get a thinner nut for the second one. I've seen Nordlocks in other high vibration locations used very effectively.
I used Nordlocks on my wastegate to manifold and they work really well, I did three track weekends with them and no problems. If you do use them make sure you get he stainless ones, as they are able to handle the heat better than the other material they offer.
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Old 10-31-09, 07:58 PM
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Are the OEM nuts new? They are made with a slight oval shape which helps secure them when tightened. However, that oval shape for creating the locking is only good once.
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