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Registered
Join Date: Jun 2006
Posts: 9
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One Battery Conversion
Hello what are some of the down sides of a one battery conversion? Do i even need to "convert" as it is right now i have a 1969 911E and it runs on one battery with out a conversion. has any one switched then switched back? If so why
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porsche fan since 1990 (cut me a break i was only 3) |
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06-26-2006, 10:44 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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No real downsides. The positives are ligher weight. With 2 batteries you can store more current, but it is unnecessary unless you have electric windows, sunroof, big stereo, etc. People like myself who switch back are doing it for originality purposes; nothng more, nothing less.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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06-26-2006, 11:19 AM
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Moderator
Join Date: Dec 2001
Posts: 9,569
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For street driving the car will handle more predictably with a greater amount of mass further from the center of rotation.
It is no mystery why the factory located the batteries where they did, and used two of them: they duplicate the increased polar moment of inertia that was found to be helpful to street handling when the SWB 911's had cast-iron weights added to the bumper in 1966. I have tried it in my '71 race car both ways and I get better lap times with more weight up front. The stopwatch doesn't lie.
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'66 911 #304065 Irischgruen ‘96 993 Carrera 2 Polarsilber '81 R65 Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13) Ex-'88 Carrera (Sold 3/29/02) Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04) Ex-'89 944 Turbo S (Sold 8/21/20) |
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06-26-2006, 12:04 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Nice real world info, John! There's not enough of it around here, it seems.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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06-26-2006, 12:08 PM
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Registered
Join Date: Jun 2006
Posts: 9
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thanks john! the reason i am looking into the switch has really nothing to do with weight savings or performance. the '69 has a pretty weak motor and hard tires. my dad drives it to work every once in a while. his "daily" summer car is a 2000 Boxster S. I want to know about the conversion because it is just a pain to have to deal with two batteries. charging both and such is annoying. has any one had experiance with the optima batteries.
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porsche fan since 1990 (cut me a break i was only 3) |
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06-26-2006, 12:09 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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I beleive that the rule is: Optima good, Odyssey bad.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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06-26-2006, 12:11 PM
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