EPIC nuts/studs loosening thread (reposting stupid stuff without reading = warning) - Page 17 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-20-2009, 10:40 AM   #321
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OK there is not enough clearance under two of the four bolts on the turbo side of the T2 flange. The turbine housing gets in the way, particularly the wastegate pivot part of the casting. Keep your EWG comments to yourself . So I am going to go the through-bolt route with socket head cap screws on the manifold flange side. Since I have an S4 manifold I can do this. Sorry all you cast mani guys

Seriously though I'll post up picts soon. I just have to figure out what FedEx did with my nuts.
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Old 07-21-2009, 03:04 AM   #322
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Begi has a new item listed in the coming soon area-complete V band setup on the turbo. No pictures of the exhaust manifold yet
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Old 07-21-2009, 04:30 AM   #323
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Quote:
Originally Posted by Rennkafer View Post
Since I qualify for keepin my mouth shut under several of these... I'll just sit in the corner over there ~~~>
Your allowed to speak Bill.
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Old 07-21-2009, 04:44 AM   #324
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Special exemption for my motor builder
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Old 07-21-2009, 06:00 AM   #325
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Why hate on V-band? Just because it's not relevant, or are there issues?
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Old 07-21-2009, 08:06 AM   #326
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Has anyone tried these from 034 motorsports?:
Aircraft Quality Turbo Lock Nut, M10 x 1.5
Temp range seems low at 500F, but I have a hard time believing our temps are much higher than this guy:
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Old 07-21-2009, 10:39 AM   #327
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Quote:
Originally Posted by bryanlow View Post
Has anyone tried these from 034 motorsports?:
Aircraft Quality Turbo Lock Nut, M10 x 1.5
Temp range seems low at 500F, but I have a hard time believing our temps are much higher than this guy:

"Torque to no more than 15 ft/lbs"

?????? Why so light?
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Old 07-21-2009, 11:56 AM   #328
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Rear mount!!!
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Old 07-21-2009, 12:49 PM   #329
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40+ psi boost
650whp
[email protected]
1:26.9 laps @ Streets of Willow

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Old 07-21-2009, 01:18 PM   #330
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Quote:
Originally Posted by faeflora View Post
"Torque to no more than 15 ft/lbs"

?????? Why so light?
probably to allow plenty of bolt stretch.
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Old 07-21-2009, 01:29 PM   #331
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Is it possible that everyone has been torquing the nuts too much, and that's why they're loosening?
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Old 07-21-2009, 01:35 PM   #332
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Quote:
Originally Posted by y8s View Post
probably to allow plenty of bolt stretch.
Because these have a 12mm head on a 10mm stud. So there is only 1mm of meat all around. You will tear it apart with more torque.

Tightening them by hand firmly with a normal hand spanner is - I think - roughly around double that (50 ftlbs/68Nm).
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Old 07-21-2009, 02:11 PM   #333
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Quote:
Originally Posted by Spookyfish View Post
Because these have a 12mm head on a 10mm stud. So there is only 1mm of meat all around. You will tear it apart with more torque.

Tightening them by hand firmly with a normal hand spanner is - I think - roughly around double that (50 ftlbs/68Nm).
50ftlbs is way too much. With a normal 12mm wrench, 15lbs is about right.
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Old 07-21-2009, 02:16 PM   #334
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Quote:
Originally Posted by bryanlow View Post
50ftlbs is way too much. With a normal 12mm wrench, 15lbs is about right.
Yes, but the nuts on my 10mm studs have a 15mm head. Although thinking of it, I don't think that firm by hand equals 50lbs after all, maybe 40.
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Old 07-21-2009, 02:31 PM   #335
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Just pulled my turbo last night. The nuts that came with my BEGi kit were 17mm! So if 15lbs is indeed the correct torque, mine were way overtightened. I'm hoping this is a partial solution to the loosening problem. I'm picking some up today.
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Old 07-21-2009, 02:40 PM   #336
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Quote:
Originally Posted by Spookyfish View Post
I don't think that firm by hand equals 50lbs after all, maybe 40.
I've tested this before. "Pretty tight" with a 3/8" ratchet is about 20ft/lbs. Years ago I worked as a mechanic at Russell racing. The axles on formula Mazdas are installed with 8 socket head cap screws that needed to be torqued to 22ft/lbs, yet there was no way to get a torque wrench in there. So we tested it by feel. 20ft/lbs was pretty tight. 22lbs would hurt a little when the end of the ratchet pressed into your palm.
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Old 07-21-2009, 02:54 PM   #337
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Quote:
Originally Posted by bryanlow View Post
40+ psi boost
650whp
[email protected]
1:26.9 laps @ Streets of Willow
Awesome
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Old 07-21-2009, 02:56 PM   #338
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Quote:
Originally Posted by bryanlow View Post
Just pulled my turbo last night. The nuts that came with my BEGi kit were 17mm!
Terminology check... The nut/screw/bolt/stud size, especially for for torquing purposes, is specified by the thread size, not the hex head size. The newer BEGI stuff comes with 10mm studs.
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Old 07-21-2009, 03:03 PM   #339
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Quote:
Originally Posted by bryanlow View Post
I've tested this before. "Pretty tight" with a 3/8" ratchet is about 20ft/lbs. Years ago I worked as a mechanic at Russell racing. The axles on formula Mazdas are installed with 8 socket head cap screws that needed to be torqued to 22ft/lbs, yet there was no way to get a torque wrench in there. So we tested it by feel. 20ft/lbs was pretty tight. 22lbs would hurt a little when the end of the ratchet pressed into your palm.
If I tighten 5 bolts, I either get number so they get tighter as I go, or I get tired and they get looser.

I'm sure it was pretty close, though - you get good at anything you do a lot.
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Old 07-21-2009, 03:36 PM   #340
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Quote:
Originally Posted by bryanlow View Post
So if 15lbs is indeed the correct torque, mine were way overtightened.
NO ONE said that. Tomorrow everyone will claim that 15lbs is the newfound solution to all God-hates-Miatas issues.
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