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Smart quod bastardus
 
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SSI heat exchangers on 930

What needs to be modified to adapt SSI heat exchangers to the 930?

I know the crossover pipes to the turbo need to be custom but doesn't RarlyL8 sell this special turbo crossover plumbing?

Any special gaskets or flange mods to the SSI and which version SSI works best?

Thanks,
Fredmeister
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 02-18-2014, 02:16 PM
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I've gone native
 
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You need to backdate the oil lines as well, crossover and pickup line to the t stat.
Keep in mind that the pipe dia is smaller as well.
Old 02-18-2014, 02:45 PM
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SSI use to offer a 930 version, did they discontinue it? I bought one of the earliest sets.
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Old 02-18-2014, 03:57 PM
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beancounter
 
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I bought the SSI kit from Bryan some years back. It has the same exchangers as Gumba's, that terminate with vband flanges just after the merge. I believe they came that way from SSI. Bryan's part was the crossover pipe and turbo inlets, wastegate plumbing, etc. I notice that the turbo flange on my set up is also stamped as SSI, but I seem to believe Bryan's crossover was his design and welded up by his supplier, not SSI. Fred will not need to backdate oil lines if he still has the original set up on his '79. '79 models came 'backdated' from the factory.

Look closely and you can see SSI stamped into the cast (or is it forged) bit where the x-over meets the turbine inlet

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Jacob
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Old 02-18-2014, 04:11 PM
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Probably the coolest exhaust you could put on a 930!
Old 02-18-2014, 05:53 PM
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Crotchety Old Bastard
 
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We designed a couple versions of the secondary pipe assembly, one elephant nose and one with dual waste gates. Nice system. The only thing I didn't like about it was the length of the secondaries. Really no way to get around that.





The best SSIs to used were the ones designed for the 930. They were 321 stainless and came with v-band flanges.





When using standard 911 SSIs we put a slip joint on the secondaries and you simply cut the SSIs after the collector. You'll notice we got away from the heavy cast SSI y-pipe and made our own merge collector.


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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
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Old 02-18-2014, 06:43 PM
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Are these still available for the 930?

Rahl
Old 02-18-2014, 08:52 PM
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We haven't made any in a while but still have the fixtures.
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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 02-19-2014, 05:11 AM
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Brian,
How much power difference did you see with the SSI system versus your header design with equal length secondaries and improved wastegate plumbing?

Did you ever dyno each set up?

Thanks,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 02-19-2014, 09:12 AM
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No back to back dynos. We had one client we built an SSI system for who later bought a set of my headers. He really liked the SSIs until he bolted on mine.
Old 02-19-2014, 09:20 AM
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I really like the stock like apearance. Most aftermarket headers look cool but are obviously not stock, like when you see blue AN fittings on a classic car.
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Old 02-19-2014, 09:40 AM
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I must be getting old, my first thought was "wow, those look like they would provide better heat".
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Old 02-19-2014, 09:47 AM
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Cost?
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Old 02-19-2014, 10:04 AM
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Quote:
Originally Posted by 16Volt View Post
I must be getting old, my first thought was "wow, those look like they would provide better heat".
The SSIs provide stupendous heat. I recognized when I bought them that there were choices which gave bigger #s on the dyno. For me, I wanted real heat, plus I wanted something that would have the quality and longevity of the OE parts. That 2nd requirement eliminated 99% of the aftermarket offerings available at the time. SSI was the only choice, and I don't think its possible to do better than them from a quality/longevity perspective.

I have no regrets and no plans to upgrade.
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Old 02-20-2014, 10:09 AM
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Quote:
Originally Posted by TT Gasman View Post
Cost?
Second this question.

Brain, what would the cost be for a set of the crossover pipes to complete the set up if one already had a set of SSI on hand?

Fredmeister
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 02-20-2014, 11:21 AM
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Crotchety Old Bastard
 
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I'll have to research that Fred as 321 has gone up sense we last made these. Shoot me an email if you don't mind and I'll return it with a quote.

Yes SSI have OEM quality heat. The original 321 exchangers will last a lifetime in most applications.
Old 02-20-2014, 12:28 PM
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would these SSIs have any performance advantage over standard (non thermal reactor) headers. They look pretty similar to the normal euro headers, except for material of course
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Old 02-20-2014, 12:47 PM
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Crotchety Old Bastard
 
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Yes. The primaries are near equal length long tubes which help with off boost torque and peak HP. The secondary system is a compromise.
Old 02-20-2014, 02:10 PM
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Quote:
Originally Posted by RarlyL8 View Post
I'll have to research that Fred as 321 has gone up sense we last made these. Shoot me an email if you don't mind and I'll return it with a quote.

Yes SSI have OEM quality heat. The original 321 exchangers will last a lifetime in most applications.
Brian I sent a PM for quote.

regards,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 02-26-2014, 12:51 PM
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