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Registered User
Join Date: Apr 2000
Location: San Francisco, CA
Posts: 542
Result of Modifications to my '88 930

Looking through the old service records for my 88 930, I have discovered that the first owner had a shop install the following cams, in place of the originals in June of 1993, when the car had only 15,700 miles on it:

105 246 09 964 - C2/4 camshaft (right)
105 247 07 964 - C2/4 camshaft (left)

So I'm assuming these are stock 964 Turbo cams?

In addition to these cams being installed, the following was done at the same time:

Performance valve job, including guides (tapered high flow) and surfacing heads. Convert heads for twin plug set up and port. Port match intake manifold and injector spacer blocks.

Sublet heads for head surfacing, valve grinding, valve lapping and mating. Assemble fuel injection system, install new (93) fuel pressure regulator & set air flow box. Install TEC-1 Dual Plug Kit and wire as needed.

INSTALL Garretson Intercooler, K27-7006 turbocharger and GHL exhaust system.

So I'd like to know specifically what effect these modifications have over a stock 883.3 930? More HP? Or no HP change, just improved response and powerband moved higher up in the rpm range?

Oh, also, I'm really curious what effect these modifications have on smog emissions? Wouldn't the twin plug setup ensure a cleaner burn?

Last edited by 73ess; 10-09-2009 at 12:18 AM..
Old 10-08-2009, 11:56 PM
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Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,556
Those are 964 cams, not 965.
K27-7006 is a top end turbo.
Twin plugs create better burn and move the detonation threshold up.
965 WUR has more inputs than '88 such as altitude compensation.
Intercooler will cool intake charge for free HP and allow use of higher boost.
Headers will aid in driveability and facilitate all other modifications.
This setup is very typical and should add 100HP on the top end. Boost probably is not all in until after 3000rpm. Affect on emissions has more to do with tuning than modifications.
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 10-09-2009, 06:55 AM
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Manassas, VA
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Join Date: Apr 2007
Posts: 1,211
I show that P/N 964-105-247-07 is the left cam and 964-105-246-09 is the right cam for a 3.6L NA 964. Those are desirable cams because of their longer duration, not sure about the lift specs. Turbo cams normally have a 930 part number. However, any cam can be a regrind, so you have to be careful. Most camgrinders will stamp their numbers on the cam, though.

I don't know how the cam would effect smog emissions unless there was some lobe overlap that caused some unburned fuel to exit into the exhaust system especially at idle. You have a catalytic converter? The twin plug heads and ignition may slightly improve the burn but I have never seen a before and after smog check to know for sure.

It sounds like you have a nice engine there.

1991 964 Polar Silver Metallic Turbo Coupe
Old 10-09-2009, 07:03 AM
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Cynical Misanthrope
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Location: Campbell, CA
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That's pretty much my build, and I passed CA smog fine.
Brian's right, those mods should be good for >100hp. I put down 354whp (probably 425 crank) last month with my stock K27/7200 on a very hot day.
X-1, AFM744, Jon, '92 C2 Turbo
JE 8:1 pistons, 964 cams, 38mm intakes ported/polished/twinplugged, ARP hardware, B&B headers/exhaust, 355whp. Full-blown GT35R 3.2 intake EFI pending...
Where my misspent time and money is currently going.
Old 10-09-2009, 10:06 AM
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Registered User
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Thanks for the info guys. Wow, I didn't think these mods would add that much HP. So 100HP above the stock 3.3 rating? So I guess I've got close to 400HP at the crank?

So which of the mods adds the most HP?

The engine feels very strong above 4500 rpm. I just took it on an 800 mile road trip, after changing all the W3DPO spark plugs. Pricey suckers! Well, actually, I changed 9 of the 12. I can't tell yet just how much stuff I've got to remove to get to the 3 plugs on the left intake manifold.
Old 10-09-2009, 03:13 PM
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