Rotating weight decrease v. HP increase
02-27-2009, 11:33 AM
#21
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Originally Posted by EuroCarFan' post='803227' date='Feb 27 2009, 12:31 PM
Yeah we had a nice thread discussing lightweight batteries on here too: http://forums.e60.net/index.php?showtopic=...t=0&start=0
BTW, Voltphreaks was giving $500 discount for their batteries on M5board but even then, I can't justify spending that much on a battery.
BTW, Voltphreaks was giving $500 discount for their batteries on M5board but even then, I can't justify spending that much on a battery.
very cool! I just read that thread.. it gives me a wish to buy that battery! wow it is pricy!
02-27-2009, 11:51 AM
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Very interesting to learn that. thanks!
Also I found some good info to diet the car:
About more lightweight batteries: http://forum.e46fanatics.com/showthread.ph...ght=voltphreaks and http://www.voltphreaks.com/index.html but it is a very expensive battery and it is only 5 pounds! (OEM is about 48 pounds) About $1500 the unit!
Also I found some good info to diet the car:
About more lightweight batteries: http://forum.e46fanatics.com/showthread.ph...ght=voltphreaks and http://www.voltphreaks.com/index.html but it is a very expensive battery and it is only 5 pounds! (OEM is about 48 pounds) About $1500 the unit!
Originally Posted by EuroCarFan' post='803220' date='Feb 27 2009, 11:26 AM
Thanks for clarifying and I completely understand what you're saying. Man, I should just go splurge and buy a set of Dymax wheels. 
I see Dymags in your future. Perhaps after 1-2 more changes?
02-27-2009, 12:08 PM
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Originally Posted by NobleForums' post='803293' date='Feb 27 2009, 12:51 PM
I see Dymags in your future. Perhaps after 1-2 more changes?
02-27-2009, 01:19 PM
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Originally Posted by EuroCarFan' post='803420' date='Feb 27 2009, 02:08 PM
WHOA! Didn't know HREs make CF barrels. How much do those things weigh? But is it me or do the faces of those wheels bulge out?
HRE's simply buying the CF barrels from Dymag. HRE's forging the aluminum centers instead of using Dymag's proprietary magnesium composite ones. I'm not sure which one is supplying the titanium connecting hardware.
The faces bulge out depending on the offset.
http://www.msnbc.msn.com/id/29364490/
02-27-2009, 02:21 PM
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Originally Posted by NobleForums' post='803293' date='Feb 27 2009, 03:51 PM
Actually, rotors are rotating unspring weight.
02-27-2009, 03:38 PM
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Originally Posted by 545OH' post='803490' date='Feb 27 2009, 03:21 PM
Actually rotors and brakes are not rotating weight. They are unsprung weight but are not part of the mass needed to rotate in order to accelerate the car. That is the wheels/tires alone plus other rotating parts leading back up to the engine itself, drive shaft etc.
You know, of course, the rotors turn with the wheels (the wheels are bolted to them), right?
04-15-2009, 08:23 AM
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Originally Posted by 545OH' post='802645' date='Feb 26 2009, 07:07 PM
...
I noticed this when I put new wheels and tires on that amounted to 44 pounds lighter for all 4 wheels w/ tires compared to stock. I noticed marked improvement in acceleration and speed as well as handling.
...
I noticed this when I put new wheels and tires on that amounted to 44 pounds lighter for all 4 wheels w/ tires compared to stock. I noticed marked improvement in acceleration and speed as well as handling.
...
Good post, good questions. I am learning more as a result of your inquiry. thank you
Question for ya though....how did you sav 44 pounds? that equates to 11 pounds per tire. OEM wheels weigh in the range of 25-26 pounds an up(124's for example). dinan rims come in at 20 pounds, enkai racing rims come in at 21 pounds. so lets say I have 124's with general tires ---> rear wheel/tire combo weighs 26+25+51 pounds. If I replace rims with dinan I only save 5 pounds per wheel. Where does the other 5 pounds come from? Tires? If so, which tires weigh 20 pounds? Are there rims lighter than dinan?
this is not meant as a challenge (dinan claims their set up saves 47 pounds!), I just want to know more on this subject.