I don't know if this made any difference but when I installed the studs into the head, mani flange to turbo outlet and turbo exhaust outlet to DP, I used a stud driver and torqued them down/in to 15 ft lbs. Then I installed the stage 8 nuts and torqued them to spec in 2 stages diagonally, like you would a wheel. I believe this minimizes tension/preload on any one end of the flange which allows for uniform expansion/contraction during heat cycling. I only had one instance of studs backing out which was when I switched from the cast FM DP to the divorced Begi unit. This was due to Begi fitment issues I was dealing with. Once they were resolved, I reinstalled the hardware using the above sequence and no problems, knock on wood. I have run about 20000 miles in the last 4 years and about 20+ track events and the same # of auto X's. My Miata is not a daily driver and see's about 60% of its use on the track.
Myron ----- Original Message ----- From: [email protected] To: Emilio - 949Racing Cc: MiataPower Sent: Wednesday, April 01, 2009 11:23 PM Subject: Re: loosening turbo to mani and turbo to d/p nuts I had them put on minime's head studs and NONE of them came loose after nearly 8k miles and about 10 track events. On the turbo and DP I was only using standard stover nuts on 8mm studs, but none of them backed out. Just last week I drilled out FrankenBRG's manifold and installed new 10mm studs for the turbo mount and am using Stage8 fasteners for the turbo mount as well as the manifold to head mount(as I had on minime) - they were very easy to install. Myron Ybarra has had them on his manifold for several years now(lots of track events) and none of them have backed out. Also(and I don't know why they don't state this on their website), but the locking retainers have a neat feature - if you flip them over they are offset 13 degrees, so you should have little issue getting them abutted -Mike ----- Original Message ----- From: "Emilio - 949Racing" <[email protected]> To: "MiataPower" <[email protected]> Sent: Wednesday, April 1, 2009 10:37:14 PM GMT -08:00 US/Canada Pacific Subject: Re: loosening turbo to mani and turbo to d/p nuts That's good news. I'll start recommending them if it's proven fix to the stud problem. I'd heard the stage 8's were rather tricky to get installed. Emilio Cervantes www.949Racing.com 26242 Dimension Dr #130 Lake Forest, CA 92630 949.716.3111 phone / fax ------------------------------------------------------------------------------ From: Bill Cardell <[email protected]> To: Emilio - 949Racing <[email protected]>; MiataPower <[email protected]> Sent: Wednesday, April 1, 2009 10:04:08 PM Subject: RE: loosening turbo to mani and turbo to d/p nuts We have had studs come out, mainly on track driven cars. I'd have to disagree about the stage 8s, though. They also address the stud coming out. TurboDog's Dad Bill Cardell www.flyinmiata.com 1-800-FLY-MX5S 970-464-5600 tech support Don't miss our Summer Camp! August 6-9 ------------------------------------------------------------------------------ From: [email protected] [mailto:[email protected]] On Behalf Of Emilio - 949Racing Sent: Wednesday, April 01, 2009 9:40 PM To: MiataPower Subject: Re: loosening turbo to mani and turbo to d/p nuts My experience has been that its more the studs backing out. So even, stage 8's, Nordlocks, safety wire and what not doesn't always fix it. Someone at MRLS mentioned that FM may be switching to or optionally offering 10mm studs with their kits. The extra surface area does seem to make them stay put longer. 10m studs have been de rigueur for turbo Miatas that see a lot of track use but its trickling down to street cars slower it seems. I haven't tried green, hi temp cylindrical bonding Loctite but that might help. Another fix might be staking them, but that may raise cracking issues with cast manifolds. Jason, you don't track your car do you? That's when stuff falls off :) I've seen daily driven turbo cars that have never had an an issue on the street, not make one session at the track before a stud or two backs out. But to answer your question yes, it's endemic for turbo track miatas. Emilio Cervantes www.949Racing.com 26242 Dimension Dr #130 Lake Forest, CA 92630 949.716.3111 phone / fax On 2009-04-02 03:05, Jason C wrote: > A lot of people seem to have this problem (though not me)....I want to understand why some do and some don't. Â Some do despite the fancy serrated FM washers.Do FM see this problem? _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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