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Registered
Join Date: Apr 2011
Posts: 236
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Twin Scroll 1.06 A/R GT35 and dual gated Rarlyl8 headers
Pre-mod I was running a GT3582R on GSF headers with a home made 3" dual out using a dynomax straight through 3" system. I was also running SDS with M&W CDI CoP and 55# injectors on clewett blocks.
It had horrible boost spiking and overboosting so I went for dual gated Ralrlyl8 headers to get around the poor WG pipe design on the GSF headers. I also decided to go with a larger 1.06 T4 twin scroll tubine housing for a true dual gated twin volute system. I also thought I'd upgrade the ECU to a DTA S80 with new EV14 72# injectors. It uses two MV-R 38mm gates with 1 bar spring stacks. It must be said the larger T4 1.06 housing is huge compared to the T3 .82AR. It is an absolute pain to fit and needs extensive brackets / hangers, mount mods, exhaust mods, inlet pipe mods, tin mods etc......but it does fit, only just.  DTA S80 ECU:  Ralrlyl8 headers with twin Tial 38's running open screamer pipes.  The 38mm exhaust ports needed opening up as the headers use large primaries with 42mm port gasket inserts. Home made dual 3" straight through exhaust (with rough as guts welding!). This dynomax muffler is perfect as the inlet is top left with a 3" straight through running to the lower right outlet with a 3" junction in the middle for the lower left. You can roll a tennis ball though it and it sounds perfect.  Results: Boost onset is slightly lazier than the smaller .82 but similar, starts showing boost at 2000rpm, 0.5bar at 2500 and 1 bar by 3000rpm in 4th, a bit later in lower gears, say 32-3300. The boost does not ramp up and hit like the smaller 0.82 housing but surprisingly responsive for a 1.06 housing. The power?, jesus the power is night and day. The pull to red line is so much stronger its jaw dropping. Still tuning the system but it would never run as hard as it does now. The other best thing is the sound.....the howl at 3000 to 4000rpm out the these headers is so delicious. Boost control - ROCK solid. It also runs noticeable better at low injector pulse widths with the new EV14 72# injectors, much better than the old EV6 55#'ers. Note I need electrical and length adapters for them but well worth it. Will try get some vids once its tuned. I'm delighted with this mod, although expensive, it still has a serious bottom end to it and a ballistic top end, what I had hoped out of a true twin scroll set up. Looking forward to adding ported heads etc and some bigger cams to really turn up the wick. Feels like a solid 500rwhp at 1 bar but could be more? its pulling about 65-70 out the injectors currently. Top end power feels relentless.
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1988 930: 3.5L 100mm LN slipins, LN FFA rods, Supertec studs, GT3582R with T4 1.07A/R twin scroll housing, RarlyL8 equal length divided headers, dual Tial MVS 38mm WG's, Carrera 3.2 heads with 993 big valves. 964 Cams, full bay IC, KEP st1 clutch. PE3 sequential ECU with 750cc EV14 injectors, CoP twin plugs, J&S Safegaurd, Aquamist HSF3 water inj. Wavetrac LSD. Last edited by b930; 02-16-2013 at 03:57 AM.. |
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02-15-2013, 11:53 PM
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Registered
Join Date: Apr 2011
Posts: 236
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Twin scroll housing
 Everything needs re-locating or modifying 
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1988 930: 3.5L 100mm LN slipins, LN FFA rods, Supertec studs, GT3582R with T4 1.07A/R twin scroll housing, RarlyL8 equal length divided headers, dual Tial MVS 38mm WG's, Carrera 3.2 heads with 993 big valves. 964 Cams, full bay IC, KEP st1 clutch. PE3 sequential ECU with 750cc EV14 injectors, CoP twin plugs, J&S Safegaurd, Aquamist HSF3 water inj. Wavetrac LSD. |
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02-15-2013, 11:59 PM
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Registered
Join Date: Nov 2007
Posts: 396
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Nice work.
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SR 86 930 x: 62 356, 64 356, 76 930, 84 911 Targa, 85 ROW 911, 00 996, 07 Cayman S, 00 M5, 02 G500, 66 Shelby GT350 (x2), 64 Corvette. |
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02-16-2013, 04:05 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Your title alone gave me chills. Been dying to hear someone do this.
Full boost by 3000 is incredible! |
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02-16-2013, 04:46 AM
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Wide body, molester.
Join Date: Dec 2011
Location: San Antonio, Tx
Posts: 153
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Awesome setup. I too have been in your shoes and just got her all buttoned up and ready to test next week. I will be compairing my results to yours.
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91- 964T, It's upkeep treats me like a skinny white kid in prison, but it does give me a reach around every now and then by letting me drive it. That's not so bad. |
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02-16-2013, 08:13 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Quote:
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02-17-2013, 04:47 AM
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Registered
Join Date: Apr 2011
Posts: 236
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Quote:
0.2 bar / 3 psi at 1800 rpm 0.5 bar / 7.2 psi at 2500 rpm 1 bar / 14.5 psi at 3000 rpm all with a 1.06 housing with a ballistic top end. It definitely works. Porsche 930 twin scroll gt35 1.06A/R boost onset - YouTube
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1988 930: 3.5L 100mm LN slipins, LN FFA rods, Supertec studs, GT3582R with T4 1.07A/R twin scroll housing, RarlyL8 equal length divided headers, dual Tial MVS 38mm WG's, Carrera 3.2 heads with 993 big valves. 964 Cams, full bay IC, KEP st1 clutch. PE3 sequential ECU with 750cc EV14 injectors, CoP twin plugs, J&S Safegaurd, Aquamist HSF3 water inj. Wavetrac LSD. |
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02-22-2013, 07:00 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,126
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Proof's in the pudding. Nice.
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02-23-2013, 05:29 AM
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Registered
Join Date: May 2008
Posts: 1,144
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Nice set up.
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'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD |
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02-23-2013, 09:06 AM
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Wide body, molester.
Join Date: Dec 2011
Location: San Antonio, Tx
Posts: 153
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I know shaky one handed cell phone videos can be misleading. Was that floored in 4th? If so, what rpm was it floored?
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91- 964T, It's upkeep treats me like a skinny white kid in prison, but it does give me a reach around every now and then by letting me drive it. That's not so bad. |
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02-23-2013, 01:43 PM
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Registered
Join Date: Apr 2011
Posts: 236
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Floored in 4th at ~1700
Cheers |
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02-23-2013, 03:59 PM
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Gary
Join Date: Mar 2013
Posts: 3
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B did you put a restrictor in the oil line and a scavanger pump to take the oil from the turbo ? I am looking to change my turbo and dont know which to use.
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03-08-2013, 06:19 PM
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Registered
Join Date: Apr 2011
Posts: 236
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yes, I use a restrictor in the oil line to the turbo (-4AN fitting with a ~1mm hole in it) as the ball bearing GT turbo's should use them, and I use the stock oil scavenge system connected to a drain tank under the turbo.
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1988 930: 3.5L 100mm LN slipins, LN FFA rods, Supertec studs, GT3582R with T4 1.07A/R twin scroll housing, RarlyL8 equal length divided headers, dual Tial MVS 38mm WG's, Carrera 3.2 heads with 993 big valves. 964 Cams, full bay IC, KEP st1 clutch. PE3 sequential ECU with 750cc EV14 injectors, CoP twin plugs, J&S Safegaurd, Aquamist HSF3 water inj. Wavetrac LSD. |
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03-09-2013, 12:24 AM
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