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v-band help please, any experts? pic included

Hey everyone,

first I'll start by saying I have no experience with v-bands but I do have a vband turbo. I purchased it in December and now in the process of fitting it to my Carrera. Anyway, my lovely Rarelyl8 muffler and zork arrived today (thanks Brian I will email you soon, excellent service and products) and when I matched them up to my Garret GT30 with a vband, the outter diameters of the bands are different? (both internals are the same 3inch ). the mufflers which I know are correct are 3.89 inch (99mm) and the turbo is only 3.3inch (88mm)?

Am I missing something, they dont have much of a surface to seal and the clamps wont fit this. I took the turbo and mufflers down to the local turbo shop and he said WTF! he's never seen a flange like that (he smelt like old feet and looked like the subway bum out of 'Ghost' so I'm sure he's seen worse), he was saying he thinks it's just a machined down 4 bolt flange? I dont know, then I got the standard lecture about not buying over the internet, I put my cigarette out on his forehead and left.

Anyway, any help appreciated, thanks!

Spence
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Old 03-04-2008, 11:21 PM
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Crotchety Old Bastard
 
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Wow, that's a head scratcher. The muffler flange is standard 3". In order to avoid machine work we need a way to prevent the joint from moving once clamped.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-05-2008, 06:41 AM
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no thats how it is , find the right v-band flange for a gt30 turbo . they are easy to find in websites where they sell this particular turbo....
Old 03-05-2008, 09:20 AM
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Quote:
Originally Posted by 930targa View Post
no thats how it is , find the right v-band flange for a gt30 turbo . they are easy to find in websites where they sell this particular turbo....
All the 3 inch v-bands I have every seen are all the same size.. Kind of odd.. I wonder if the GT is 2 3/4 v-band?
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Old 03-05-2008, 09:40 AM
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Do you have a picture of the clamp installed?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-05-2008, 09:48 AM
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Thanks for the replies guys.

Brian I dont have a clamp, the one they had at the turbo shop clearly didn't work so I didn't buy it, the turbo didn't come with a clamp.

I received this reply from ATP this morning though so maybe all is good, I just fail to see how it would work well. It's also gotta support the weight of the muffler and although light it seems like a big ask.

"The Garret housings do not have enough material to machine to full 94mm outer
diameter and can only be machined to 88mm OD. They are both compatible with
each other if you use our clamp and they will mate and centre out just fine.

No additional insert is required between them."
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Old 03-05-2008, 02:02 PM
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Quote:
Originally Posted by spence88mph View Post
Thanks for the replies guys.

Brian I dont have a clamp, the one they had at the turbo shop clearly didn't work so I didn't buy it, the turbo didn't come with a clamp.

I received this reply from ATP this morning though so maybe all is good, I just fail to see how it would work well. It's also gotta support the weight of the muffler and although light it seems like a big ask.

"The Garret housings do not have enough material to machine to full 94mm outer
diameter and can only be machined to 88mm OD. They are both compatible with
each other if you use our clamp and they will mate and centre out just fine.

No additional insert is required between them."

yup sounds right to me
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Current project 73 914-6 Gt project rusteration 2.4
Reproduction 914-6 oil tanks, 1-5/8" 914-6 heat exchangers source call 2623647426 or email mbconsulting21 @gmail.com
Old 03-05-2008, 02:49 PM
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Crotchety Old Bastard
 
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Spence, if you are concerned about the support you can add a simple muffler bracket to the tailpipe and hang it from the bumper shock mount on the chassis of the car.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-05-2008, 06:09 PM
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This is correct i use them on my twin gt35rs. newer tech than the old bolt set up.
Old 03-05-2008, 09:05 PM
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Thanks for the replies guys, I'm going to go ahead and mount it now and keep looking for a vband that will work.

Brian, yep I think I will do that, thanks for the advice, BTW, jaws are dropping when ever I show them the muffler! No one can beleve how light it is!
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'89 911 M491+Turbo
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'88 928S4
'13 Z4 35is
'13 MV F4RR
Old 03-05-2008, 09:08 PM
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Crotchety Old Bastard
 
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Titanium is cool.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-06-2008, 06:59 AM
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thoes v band clamps are apx 90.00 for that turbo.
Old 03-06-2008, 05:15 PM
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Im going to V-band on my car, I hope I dont have the same crap to deal with (PT-67)
Ill call precision and see if they have any recommendations
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Old 03-06-2008, 07:46 PM
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yep it's a pain but atp say their clamps work with that turbo, they're not too expensive either I think about $30.

Brian, Ti? you for real, I love Ti! I put Ti Fasteners through my motorbike, such lovely stuff!
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'89 911 M491+Turbo
'89 944 Turbo
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'13 Z4 35is
'13 MV F4RR
Old 03-06-2008, 09:10 PM
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If anyone needs a Garrett turbo I can get a break on them and will pass it on to you. PM me with the turbo you need as well as accessories.
Old 03-06-2008, 10:50 PM
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Crotchety Old Bastard
 
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Ti comment was a little tongue in cheek. 321 SS contains Ti and more Ni than 304 making it much more expensive and helping to give it the properties you see - strength, light weight, and the ability to take a lot of heat.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 03-07-2008, 06:40 AM
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Yea, I like Ti as well- hold on while I sell my soul for a few ti connecting rods...
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Old 03-07-2008, 09:21 AM
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Yes, the ATP v-band housings have a proprietary flange machined into them. Anytime I deal with those housings I always buy a few extra flanges to properly mate up with them.

As long as the clamp bites into the taper of the GT side v-band flange, you won't have a problem with leaking and or slippage.
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Old 03-08-2008, 06:50 AM
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