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Registered User
Join Date: Mar 2009
Posts: 64
Spool SSI vs Stock heat exchangers

Anyone tested this as only upgrade?

How much will it reduse spool compared with stock system (I know that i have too make secondaries myself).
Other choises:

Leave it as is.1bar 4000-6800rpm(marvelous when you are at booost) 4 speed tranny and the gearing makes it hard too stay in sweet spot(autox).

Build short pipe headers (Will propably not go this way cos I live in cold climate or inklude a Eberspecher heater).

If there is a spool benefit then I give it a shot.
Old 12-16-2011, 12:58 AM
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Forced Induction Junkie
WERK I's Avatar
Join Date: Jan 2003
Location: Wisconsin
Posts: 3,291
I know of two people that have converted the stock system to SSI's. One track and one street, both reported no discernible difference in the response of the turbocharger.

One other choice; change your turbocharger. Go with a Garrett GT30 or GT35 (based on engine mods). These turbos will more than compensate for any loss of runner length with faster response time.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 12-16-2011, 06:22 AM
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Crotchety Old Bastard
RarlyL8's Avatar
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
I've done a bunch of these and we still produce the secondary system to go with the exchangers.
The advantage of the SSI system over both OEM and short tube headers is not reduction in turbo lag but rather an increase in off-boost torque. This is also the only aftermarket system with real heat. The short tube systems (and my medium length system) have only a fraction of the surface area available for heat when compared to the SSI exchangers.

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 12-16-2011, 11:24 AM
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Registered User
Join Date: Mar 2009
Posts: 64
Thanks guys!
Seems that itīs not worth the hazzle go from std too SSI.
But if the SSIs produce better tourqe of boost it should produce more exhausts and spinn the turbo earlyer
Old 12-17-2011, 12:11 AM
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Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,369
I have Brian's SSI based system on my 1979. I didn't choose it because I expected it to make more power. For me the decision was based on quality and longevity. I read too many stories about poor fitting aftermarket systems, and of the tendency for them to crack. I wanted a system that would fit properly and have a chance to last 20+ years like the factory parts often do.

If I were building a dyno queen high horsepower car, I suppose I would look at a different exhaust, but for my extensively modded street/track car the SSI system is just right.

Photos available at the link

Porsche 930 - Jacob Asbury's Photos
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 12-17-2011, 06:11 AM
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