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.

 

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

 

Your allowed to speak Bill.

 

Special exemption for my motor builder

 

Why hate on V-band? Just because it's not relevant, or are there issues?

 

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?

 

Rear mount!!!

 

40+ psi boost
650whp
10.93@134mph
1:26.9 laps @ Streets of Willow

 

probably to allow plenty of bolt stretch.

 

Is it possible that everyone has been torquing the nuts too much, and that's why they're loosening?

 

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.

 

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.

 

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.

 

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.

 

Awesome

 

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.

 

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.

 

NO ONE said that. Tomorrow everyone will claim that 15lbs is the newfound solution to all God-hates-Miatas issues.