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Join Date: Jan 2001
Posts: 696
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3.4 upgrade for '87 worth it?
What's the consenous out there for this upgrade? Cost effective for the gain? Remeber it will be using Calif. 91 octane gas. Only other mod's done is a Euro premuffler and a Dansk SS muffler added. Maybe C2 cams would be a better avenue, at least cheaper.
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07-03-2002, 10:39 PM
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Join Date: Nov 2001
Location: a few miles east of USA
Posts: 3,393
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worth while if you're doin a rebuild anyway otherwise expensive. 6.25% power increase.
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Rich  '86 coupe "there you are" |
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07-03-2002, 10:55 PM
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Join Date: Mar 2002
Posts: 3,563
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I looked into this prior to doing my Turbo conversion. With the price of the P&C's at around $3.5k USD (approx $8k AUD by the time it lands in Oz), I decided against it.
Instead, I put that money into the components for my turbo conversion and haven't looked back. IMHO, not really worth the added 6% of HP. You'd be better off getting a performance header system for that $$$$. Just my 2c...
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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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07-03-2002, 11:50 PM
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As RichardNelson said (hah don't think you can confuse us by changing name) I too would recommend a 3,4 conversion only when you are rebuilding your engine anyway.
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07-04-2002, 12:01 AM
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Warren Hall Student
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Can't you take the 95mm cylinders and bore them out to 98mm. Then replate the nickasil and add JE pistons? This would be cheaper than new P+C's, right?
Bobby |
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07-04-2002, 02:15 AM
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Join Date: Mar 2002
Posts: 3,563
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Certainly would be a cheaper option. I may look into that also when it comes time to do a rebuild and capacity upgrade on my turbo 3.2. The trick is finding a machinist you can trust!
May be worth just sending the 95mm cylinders to JE to have machined, recoated and new forged pistons @ any C/R made to suit. I'm told this is what RUF and Mahle do - bore out the 95 C's to 98.
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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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07-04-2002, 02:25 AM
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Irrationally exuberant
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I've done this - sort of. I twin plugged mine and went to a higher compression. I would not say my setup was cost effective compared to a 3.6 conversion. EBS sells bored out replated cylinders and JE pistons for around ~$2400 I think.
-Chris |
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07-04-2002, 03:39 AM
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73' Porsche Targa
The Blue Pheonix
