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one of the great unwashed
 
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Join Date: Apr 2004
Location: Ringwood, NJ
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Stock wastegate replacement ???

I am retrofitting my SC turbo convert with a 930 exhaust. I have two iterations of this. One is a set of OBX headers, which I have already done trial fitment of, and fabricated custom turbo support brackets, welded in the flange for my 38MM Tial wastegate, and plumbed all of the turbo piping for.

I also have a stock exhaust system from an '87 930, which fits reasonably close to the OBX stuff. One noticeable difference is that the turbo will sit about 1/2" lower on the stock 930 exhaust. The other is the wastegate location. I cannot really cut off the flange and put another 38mm flange on it, because I can't get the wastegate outlet on. I like parts interchangability.

What is the Tial (or other) replacement for a stock 930? I am leaning towards the headers, as they are much lighter. But, I also like the option of heat, as I did use the car occasionally in the colder weather. At least my 986 has heat and snow tires.

TIA
Pat
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Patrick E. Keefe
78 SC
01 Boxster
Old 11-22-2009, 09:10 AM
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The Tial 46mm is a direct bolt-on, and what most of us use as a replacement.
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1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
Old 11-22-2009, 09:22 AM
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Crotchety Old Bastard
 
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Quote:
I also have a stock exhaust system from an '87 930, which fits reasonably close to the OBX stuff.
This is backwards. The OBX stuff should fit reasonably close to stock. If it doesn't then nothing will line up right or fit.

You need a bigger waste gate, especially in a low boost application. Stock replacement for the 930 is 46mm. You will need to vent more exhaust to sustain 0.5 bar than higher typical 930 levels.
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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 11-22-2009, 10:01 AM
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The only wastegate to buy. Follow this link for some additional reading.

TiAL Sport.com
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 11-22-2009, 11:13 AM
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one of the great unwashed
 
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Quote:
Originally Posted by RarlyL8 View Post
This is backwards. The OBX stuff should fit reasonably close to stock. If it doesn't then nothing will line up right or fit.

You need a bigger waste gate, especially in a low boost application. Stock replacement for the 930 is 46mm. You will need to vent more exhaust to sustain 0.5 bar than higher typical 930 levels.
I agree, but I had the OBX stuff ready to fit before I had the stock 930 exhaust ready. One of the drawbacks to having no point of reference on a retrofitted SC. Also, the support is custom, as I have a new Borg Warner with a V-band exhaust, and really can't use a stock 930 support bracket. I am going to try and find a 46 Tial for the stock HE setup. I will say, the Tial 38 worked well on the prior Rajay setup without any boost creep.

Pat
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Patrick E. Keefe
78 SC
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Old 11-22-2009, 01:41 PM
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Crotchety Old Bastard
 
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Pat,
I may have an extra 46mm WG flange that you could make an adapter with to fit the 38mm unit on the stock J-pipe. If it worked for you previously then it should work now.
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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 11-22-2009, 03:21 PM
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one of the great unwashed
 
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Thanks Brian:
The problem is the 38 exhausts perpendicular to the valve cover face (the 930 is parallel), so I have no room to put the WG outlet anywhere. I don't want to chop up the stock setup. Wait, I think I have the spare I cut off the OBX headers, let me see if I can spin the WG.

I appreciate the offer!
Pat
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Patrick E. Keefe
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Old 11-22-2009, 03:52 PM
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Crotchety Old Bastard
 
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TiAL 38mm should be a v-band which would spin any direction you wish.
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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 11-22-2009, 08:52 PM
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