HP Autowerks lightweight battery kit installed - 30lbs lighter

[pixelblue]

Originally Posted by The1

i just wish i wasn't so tall, high center of gravity

LOL, that would've been a problem if you were driving standing up! actually your rides center of gravity is improved because you are tall since you would have to sit lower and further back in the car compared to someone who is 5ft tall for example. your butt is where your center of gravity resides at.

also, the older porsche had terrible mid turn throttle off oversteer not because they weighed more but because they weighed half a ton less with no active suspension management system (PASM) as they do now. hope this helps clear up your misinformation my friend

[rsjean]

Originally Posted by MarkR171

You don't gain horsepower by reducing weight...

But you do gain HP per LB. Which is really what it's all about.

[The1]

Originally Posted by pixelblue

LOL, that would've been a problem if you were driving standing up! actually your rides center of gravity is improved because you are tall since you would have to sit lower and further back in the car compared to someone who is 5ft tall for example. your butt is where your center of gravity resides at.

also, the older porsche had terrible mid turn throttle off oversteer not because they weighed more but because they weighed half a ton less with no active suspension management system (PASM) as they do now. hope this helps clear up your misinformation my friend

lol guess you'd have to see the way i'm built all my weight is at my shoulders.... And your center of gravity is nowhere near your hips.... especially when your legs are extended in front of you, that just raises it up higher.

and porsches without the PASM engaged still handle the weight in the back waaaay waaaay better then older ones, don't worry, there's been about 10 (literally) porsches in my family while i was growing up, right up untill about 3 weeks ago.

PASM is basically just there to keep rich people from suing them because they can't drive.


so please pull your misinformation out of your ass before you talk next time.
Thanks.

[The1]

Also, i think your comment has demonstrated to me that you don't actually understand fully what center of gravity actually means when it comes to a car.....

you're right me sitting in a car lower would help to a certain extent, but that's where your knowledge seems to end.... I suggest more research for you my friend.

[pixelblue]

Originally Posted by The1

lol guess you'd have to see the way i'm built all my weight is at my shoulders.... And your center of gravity is nowhere near your hips.... especially when your legs are extended in front of you, that just raises it up higher.

and porsches without the PASM engaged still handle the weight in the back waaaay waaaay better then older ones, don't worry, there's been about 10 (literally) porsches in my family while i was growing up, right up untill about 3 weeks ago.

PASM is basically just there to keep rich people from suing them because they can't drive.


so please pull your misinformation out of your ass before you talk next time.
Thanks.

WOW, you literally have no clue what you are talking about you young defensive man! lets break this down for you one more time. the human body's center of gravity is in fact the gluteus maximus and it doesn't matter how big and burly you are built in your shoulders. second, your comment "porsche without PASM...better than the older ones" confirms what I have been saying. the older porsche 911s weighed half ton lighter than the modern versions and therefore without the aid of some serious aerodynamic down force or electronic management system the cars exaggerated f/r balance contributed to the mid turn throttle off oversteer. third, your statment "PASM is basically..." is supremely infantile and uninformed and lastly if you can't have an adult conversation without being insulting, you should go back to your room and read some books instead of pumping weights. singing off...

[The1]

Lol. I'm glad you signed off, you're making other forum lurkers dumber. Do some research. Its really simple really. Its amaiziong how defensive you are when you "know you're so right"

[rsjean]

Originally Posted by pixelblue

WOW, you literally have no clue what you are talking about you young defensive man! lets break this down for you one more time. the human body's center of gravity is in fact the gluteus maximus and it doesn't matter how big and burly you are built in your shoulders. ...

I'm sorry to have to differ but years ago I married into a gymnastics family (Olympics level) and the discussion of human center of gravity was quite common. Here is a link to one such 'conversation'. You will quickly see that - you are wrong.
http://www.emunix.emich.edu/~wwitten/COFG.htm

[pixelblue]

^"The center of gravity is the theoretical point where all the body weight is concentrated" unless you are telling me that point is not where the biggest muscles in the human body are (thighs and butt) then I guess you are right and I am wrong.

[rsjean]

Originally Posted by pixelblue

^"The center of gravity is the theoretical point where all the body weight is concentrated" unless you are telling me that point is not where the biggest muscles in the human body are (thighs and butt) then I guess you are right and I am wrong.

Not sure how much more clear it can be:

"The center of gravity is the theoretical point where all the body weight is concentrated or the theoretical point about which the body weight is evenly distributed. If a body is of uniform density and has a symmetrical shape the center of gravity is in the geometric center. If the object is not symmetrical and does not have uniform density, it is more difficult to describe the location of its center of gravity.

Because the human body is not symmetrical and is of non-uniform density, the center of gravity is difficult to locate. In fact, the body's center of gravity shifts with each body movement. When the distribution of a person's body weight changes, the center of gravity shifts toward the greater weight concentration."

Theory is great - but the human race is far from theoretical. Also symmetrical is certainly NOT what most bodies are. And lastly if we were simply talking about a skeletal structure with muscle attached to it things would be simpler. But you have different density of muscle, fat, and many other mitigating factors. Rest assured that those crafty little Olympic gymnasts that have to fling their bodies all over the place and across a multitude of devices are pretty good at understanding how the center of gravity for a human body is NOT where you thing it is and changes dynamically with position and differs from person to person.

[pixelblue]

we are talking about one single position and that is sitting in a car. you are not jumping up and down. it is also known that the human muscle out weight every other organ or bone in the body. the statement was because someone is taller it compromises the cars center of gravity. my response was exactly the opposite because you sit lower and further back in the car therefore it actually enhances the cars center of gravity. in any event this subject has drifted into human physiology and what not. but if you still wish to believe the premise that being taller hurts the cars center of gravity then I will concede and call it the day.

[3onDubs]

Might be a stupid question, but how would this battery hold up in powering an aftermarket amplifier?

Seems like this can cancel out the weight added by throwing in a 10" sub + amp in the trunk, but I'm just wondering if it has enough juice.

[The1]

Originally Posted by 3onDubs

Might be a stupid question, but how would this battery hold up in powering an aftermarket amplifier?

Seems like this can cancel out the weight added by throwing in a 10" sub + amp in the trunk, but I'm just wondering if it has enough juice.

I would look at an optima battery or something like that.

these light weight batteries are more geared towards racing application instead of being a complete substitute for the stock unit.

[GaryS]

"135i has an added rear trim weight to improve axle load distribution."

--BimmerFile, Feb 13th, 2008
http://www.bimmerfile.com/2008/02/13...s-build-facts/

Maybe that is the quote I remembered, except I thought there was more detail.

Originally Posted by GaryS

I remember something about a weight, like a lead bar or something, that BMW added in the rear of the car to get better front-rear balance. Is that true? If it is, did you remove it?

[rsjean]

Originally Posted by pixelblue

we are talking about one single position and that is sitting in a car. you are not jumping up and down. it is also known that the human muscle out weight every other organ or bone in the body. the statement was because someone is taller it compromises the cars center of gravity. my response was exactly the opposite because you sit lower and further back in the car therefore it actually enhances the cars center of gravity. in any event this subject has drifted into human physiology and what not. but if you still wish to believe the premise that being taller hurts the cars center of gravity then I will concede and call it the day.

If you look at the diagrams you are using to support your case, the top body illustrations indicate a center around the abdomen when standing. (It's actually belly button / lower back on average). Once seated, as in the diagram below the figures, once you add the weight of the thighs and knee area, the center can no longer be at the same point as when standing. What is illustrated in the bottom diagram is 'center plane' not center of gravity.So it is when sitting that you are off.

[babyboss]

so bottom line - do we install this battery 2 go faster ??

[pixelblue]

^ do it. just keep in mind by itself it won't be a big improvement in performance but as an overall weight saving list of mods it's definitely worth it. 30 lbs is equivalent to 6 gallons of fuel. so the performance increase would be equal to driving with a half full tank of gas vs a full tank.

[The1]

Originally Posted by pixelblue

^ do it. just keep in mind by itself it won't be a big improvement in performance but as an overall weight saving list of mods it's definitely worth it. 30 lbs is equivalent to 6 gallons of fuel. so the performance increase would be equal to driving with a half full tank of gas vs a full tank.

will feel like you gave the car a coffee and it's having a cafine hit

it's no more powerfull, but it just seems to be more hyper.

[HP Autosport]

Originally Posted by babyboss

so bottom line - do we install this battery 2 go faster ??

Your car will be faster, especially around corners, you are removing weight from the end of the car to lower the polar moment. One of the result of a low polar moment is quicker steering response.

[vwrefugee]

Not to mention changing a battery without registering it with the car's electrical system can cause problems.

Bringing back this thread because the questions about the functionality of a lightweight battery swap were never really answered. My OEM battery was just replaced by the dealer on a recall (apparently going from 70AH to 90AH) and part of the procedure was a software update specific to the battery change. So if we do a battery swap without telling the ECU what happens?

[HP Autosport]

Originally Posted by vwrefugee

Bringing back this thread because the questions about the functionality of a lightweight battery swap were never really answered. My OEM battery was just replaced by the dealer on a recall (apparently going from 70AH to 90AH) and part of the procedure was a software update specific to the battery change. So if we do a battery swap without telling the ECU what happens?

Most of the time nothing happens, the charging system will still provide enough charge for the lightweight Braille battery.