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Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
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Compression on a 930?
What is a good compression to do on a 3.4 turbo engine? I was thinking 7:5:1, what do you guys think?
will also have upgraded exhaust, intercooler, twin plugged, and turbo (probably k27 HF)
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John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
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02-28-2007, 11:48 AM
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up-fixing der car(ma)
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John, check this out:
930 Twin Turbo 3.4 Project...commencing... 7.5:1 will allow more top-end boost, 8:1 may be a bit better for you on the street--a little quicker off the line/low rpm. Cheers
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Scott Kinder kindersport @ gmail.com |
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02-28-2007, 01:28 PM
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Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
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Thanks Scott
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John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
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02-28-2007, 01:31 PM
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Join Date: Mar 2002
Posts: 3,563
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My vote is 7.5:1, which will allow you to run higher boost, than a 8.0:1 configuration and will still allow good streetability with nice aftermarket headers, turbo and exhaust.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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02-28-2007, 05:08 PM
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Registered
Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
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Thans Merv. From the info I got from Scott I'm thinking I will go 7.5:1. Since I will be twin plugging it will really be closer to 8:1 anyways, and I dont want to have to buy new pistons for when i do decide to race. Also the pistons I'm getting are race pistons.
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John A. 1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.) 05 Boxster S: For the Track. 06 Dodge Ram 2500 Power Wagon: Tow Vehicle |
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03-01-2007, 04:56 AM
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