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Registered
Join Date: Jan 2001
Posts: 696
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Best dailey driver cam for '87 Carrera, Web 20/21 or 964?
I'm probably going do a valve guide replacement soon on my '87. While at it, what cam would be an improvement and still pass Calif. smog? I have a Dansk sport muffler and Autothority chip #911.300 and use the P-car for occassional dailey commute. I have a hunch the 964 cam is slightley milder and should pass smog, no problem. Is the Web cam 20/21 a more potent performer and does it pass smog? Could someone explain the differences between the two?
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03-09-2003, 08:55 PM
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Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Hard to beat the stock cam IMHO. What kind of improvements are you looking for specifically?
Regs, Joe |
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03-10-2003, 07:16 AM
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I just put a recently rebuilt 3.2 in my '87 Carrera. It has Webcam 20/21 cams, Autothority chip and really pulls a lot stronger after 4000 rpms. My gas mileage has plumetted and I'm taking her in tonight to have the mixture checked. I'll report back.
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2022 BMW 530i 2021 MB GLA250 2020 BMW R1250GS |
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03-10-2003, 08:34 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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I'm wild about my 20/21 cams, but my car is not the same as yours. Mine is a SUPER Carrera. (wink) And I don't have smog testing to worry about. If I did, and if the cams would not pass, I would change cams twice a year. I like them that much.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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03-10-2003, 08:38 AM
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Yeah? Well, mine goes to eleven!
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2022 BMW 530i 2021 MB GLA250 2020 BMW R1250GS |
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03-10-2003, 08:41 AM
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Join Date: Jan 2001
Posts: 696
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Yeah, I've noticed that the Autothority Chip does reduce gas mileage. Is the additional fuel consumption really necessary for the small increase in power? I wonder if that is typical for other power chips?
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03-12-2003, 08:37 PM
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Join Date: Jul 2002
Location: Geneva
Posts: 15
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I had 964 cams, Euro spec cylinders/pistons and a custom chip installed in my '87 Carrera about 3 months ago when the car had a top end job (at 95,000 miles). I use it as a daily driver and notice a great improvement in acceleration throughout the range. Gas mileage is about 14 to the gallon in the city. Very pleased with the results.
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Michael H 1987 Carrera |
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03-12-2003, 11:49 PM
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Only Porsche
Only bike
