Weight reduction - 981 cayman
12-18-2014, 11:40 PM
#16
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I have this battery. It's 11 pounds.
12-18-2014, 11:42 PM
#17
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There is a lot less to shed vs. the 987.2 When you start removing panels there's at least 1 less layer. The doors are a good starting point but they're not as heavy as those would think. The exhaust manifolds and mufflers are heavy AND they're in the rear so it's good weight to remove. Trim pieces and other parts for sound deadening and/or heat insulation can be removed but you don't want to go too far if it's street intended. I would assume you could do the following WITHOUT breaking the bank:
1.) lexan windshield
2.) lexan hatch
3.) lightweight wheels
4.) battery
Getting a bit more expensive...
5.) lightweight disc assemblies
6.) lightweight/aftermarket seats
While a bit more expensive...
7.) any number of OE replacement parts from Getty Design in So Cal for the 981 (hatches, decklids, doors, etc.)
8.) cutting of trim metal/aluminum from the car's peripheral/trim pieces.
The gutted PDK race car we just finished weighs 2800lbs with some gas in it and full aero, roll cage, etc. I think that a stripped 981 has potential to get awful close to 2700 or below.
1.) lexan windshield
2.) lexan hatch
3.) lightweight wheels
4.) battery
Getting a bit more expensive...
5.) lightweight disc assemblies
6.) lightweight/aftermarket seats
While a bit more expensive...
7.) any number of OE replacement parts from Getty Design in So Cal for the 981 (hatches, decklids, doors, etc.)
8.) cutting of trim metal/aluminum from the car's peripheral/trim pieces.
The gutted PDK race car we just finished weighs 2800lbs with some gas in it and full aero, roll cage, etc. I think that a stripped 981 has potential to get awful close to 2700 or below.
12-19-2014, 12:30 AM
#18
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1400 cold cranking amps. It's a lot better than OEM. Instantaneous. Lead acid is like starting an engine with a hand crank, and is very inefficient to recharge which puts unnecessary strain on the alternator. Lithium ion draws only 1/5 the energy to fully recharge.
12-20-2014, 06:27 PM
#20
Instructor
You can't make an NA motor more powerful, but you can do things like delete the AC (Boxster spyder) or effectively remove the burden of charging the battery (Boxster spyder). Losing 40 pounds is nice, also.
Or you can be the cheapest Porsche owner in the world and get batteries at Sears every 4 years, instead of this lifetime battery.
Or you can be the cheapest Porsche owner in the world and get batteries at Sears every 4 years, instead of this lifetime battery.
12-20-2014, 08:22 PM
#21
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is this a double duty street track or simple track car?
Headlights are about 20lbs after you add the blanks.
door side impact bars are abt 18 lbs each
cut away on the doors are a big plus as well.
Remove the higher weight and it will improve the center of gravity.
As John said
Lexan by itself isnt much of a savings on the windshield but hatch and teh rear glass is big.
Headlights are about 20lbs after you add the blanks.
door side impact bars are abt 18 lbs each
cut away on the doors are a big plus as well.
Remove the higher weight and it will improve the center of gravity.
As John said
Lexan by itself isnt much of a savings on the windshield but hatch and teh rear glass is big.
12-29-2014, 09:29 AM
#22
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You can't make an NA motor more powerful, but you can do things like delete the AC (Boxster spyder) or effectively remove the burden of charging the battery (Boxster spyder). Losing 40 pounds is nice, also.
Or you can be the cheapest Porsche owner in the world and get batteries at Sears every 4 years, instead of this lifetime battery.
Or you can be the cheapest Porsche owner in the world and get batteries at Sears every 4 years, instead of this lifetime battery.
I listed Getty Designs for that very reason. Going to carbon produces greater weight savings in the rear. The 987 and 997s already had a hybrid composite front deck lid. The new 981 stuff is light but there are already Carbon Fiber replacements available.
12-29-2014, 10:58 AM
#23
Rennlist Member
AFAIK Porsche has only made one "Motorsport Battery", suncoast sells them. Ridiculously expensive (even used) but they do pop up occasionally on the B&S for $1200-1500. It's hard to believe how light this battery is. It has worked flawlessly for me but I do keep it on a tender when I'm not driving the car for a while. The tender is more to promote long battery life then worry about a marginal charge.
01-02-2015, 11:27 PM
#24
I have this battery. It's 11 pounds.
Amazon.com: Braille Battery i48CX Intensity 12V 'Group 48' Carbon Lithium Battery: Automotive
Amazon.com: Braille Battery i48CX Intensity 12V 'Group 48' Carbon Lithium Battery: Automotive