I forgot i had this...
http://s220.photobucket.com/albums/dd109/smokumxxx/?action=view&current=MVI_0249.flv

Was that a single battery? (left side of the car was too dark to really see in the video). How many CCA is that?

Also, what did you have stuffed in the glove box there :)

Ya that was a single battery, and the faceplate is in the glove box.
http://www.brailleauto.com/
http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&itemPerPage=90&N=1010683&langId=-1&catalogId=10002&Ne=1

i thought so too... i didn't see much, but it looked like there was just one battery.
makes me wonder, are there not two batteries for a good reason?
i forgot what the reason was , hmmmm

Well from what i know when i went to research what battery was for this car there is 2 options either 2 500cca batterys or 1 850cca battery, it was from an exide battery book @ kragen

first problem is that you are relying on information from Exide or KRAGEN.

either or exide im pretty sure knows batterys, but i was hesatent to say were i read it from cause i knew some one would have something neg to say.But the proof is in the pudding.

so why do all 850 come with 2 batteries?
i remember they can run on just one...but.
every 8 i've seen had two batteries.
either or exide im pretty sure knows batterys, but i was hesatent to say were i read it from cause i knew some one would have something neg to say.But the proof is in the pudding.

i didn't see anyone say anything negative.
but what actually is your proof, since you talk about dessert already, smokum

so why do all 850 come with 2 batteries?
i remember they can run on just one...but.
every 8 i've seen had two batteries.
Two batteries means they can be put in smaller spaces and the weight can be distributed over the left and right half of the car.

Both batteries are put in parallel. It doesn't matter if you put one, two, three or more batteries in the car, as long as they put out enough current to feed everything. The problem is that you will need one hell of a large battery if you want to go the single battery way and not lose on battery life. Where will you put it?

Btw, if you ever take out the instrument cluster you'll notice there are actually two battery symbols - but only one can be used. In other words, it seems BMW had plans to use the two batteries independant from each other - hence the two battery status indicators. However, somewhere along the development process they switched to a more standard parallel setup.

http://www.exide.com/batteryselector/AppLookup_Results.asp
KA-CHING!
Hope you dont think i maken it up

:)

waw..this is the guy I was looking for!!!

...so lets forget about gel batteries and focus on weight!!!!

my questions are almost answered....


so....

who is the winner?

...Optima...PowerMaster...Braille...or oddysey

..wasn't being negative, I was trying to say that when I went to get replacement belts for example, the local auto parts store "looked it up" and when I got home to install the one was too short and the other too long. ANother piece of info that is incorrect most of the time at AUTOZONE, PEP BOYS, KRAGEN, etc, is the oil filter, it too is listed incorrectly for all 1992 and up 8 series.

That is why I would be hesitant to just blindly go with what some auto parts guy that sells mostly small block chevy parts and air fresheners, has to say..

http://www.exide.com/batteryselector/AppLookup_Results.asp
KA-CHING!
Hope you dont think i maken it up

:)

i wonder why they don't have 93 listed there . it goes from 92 straight to 94.

they also say that two batteries may be required

Braille is what i have in my car i was going to go with the oddysey, they are both almost the same. Id call and chat a bit with the 2 companys if you have a big current draw when your can is off you want to go with something with more capacity, The one i have is a deep cycle they say takes a bit longer to charge. HIT THEM UP

Optimas has good new technology, with the gel stuff and spill proof...

Braille its also spill proof!!! ans super light weight, should I go for the B3121???

Oddysey Ive seen them in competition audio stores (must be good)

Powermaster D3100 seem to take all the above by far except for the price...


What you guys have to say?

Should I get MTP-93s??? Bosh??? or any of those kika ss batteries listed above???

WHICH ONEEEEE!!!!

Buy them all!

Buy them all!

:eek: hahaha you're awesome :D

Oddysey ,I was going to get it as a matter of fact i chatted with the sales dept and they were telling me about a shop that does this swaping out of the batteys on the porches from 2 batt to single and was using Oddysey for it.
in the end i went for the most cranking amps its close between the 2.
JEGS has them both the cheapest

I would leave at 2 battery's no matter how high the cranking amps, If you count the modules relays etc... Most wood leave it too! This amount of electronics is not sporting 2 batteries for looks, I also own a TT Porche and wouldn't think of doing the swap, That thing is light enough, So the weight is not a issue there, The 8 will do 180 Modified or course, It want do it any faster if you take both the batteries out, The best way to launch 2 tons is to change the diff or Force induction, Or both along with several other mods! If you don't fabricate a lot of parts to get the weight loss, Then it's sort of a loss cause, You make it too light, Then it's dangerous and you will have to tube it/Role cage it and then you got all your weight back, Or most of it, One thing about this car, It's safe and most speed mods more than likely been tried already. I've yet to hear of a success story reducing the weight in these cars and being safe. It's a GT, Enjoy it!

??? Im doing it with 1 battery and i have told everyone ? am i invisable?
i even have a video. i have reduced the size of my spare to reduce weight not diameter on a stk wheel. Your 0-60 will change you will notice it.

http://forums.bimmerforums.com/forum/showthread.php?t=1070566

The 2 batteries was also for even weight distribution (both front to back as well as side to side....

??? Im doing it with 1 battery and i have told everyone ? am i invisable?
i even have a video. i have reduced the size of my spare to reduce weight not diameter on a stk wheel. Your 0-60 will change you will notice it.

http://forums.bimmerforums.com/forum/showthread.php?t=1070566
No your not invisable!-) So what's your 0-60 now? Did you chip your car.

Well heres the debate in side my head if i chip not i know it will afect the advance curve... so when i got the chance to turbo it up it will be.. too advanced. So im holding off on that for now Id rather go for the added psi then not with too much timing.

You will have to change the timming and fuel curves if you add PSI no matter what (unless you want a complete meltdown). It is common Knowledge/practice in the drag racing world that for every 100 pounds of weight you lose you shave a tenth (1/10) of a second off your 1/4 mile time. not enough to notice in our case. A difference in shift points, driving style, weather and or elevation will make a bigger change than your spare and battery swap. Im not sure it will be worth the time and $$ invested especially as sensitive as our cars are with battery charge/reserve. CCA is usually not the issue.

Since there's a mention of weight savings in this most recent thread here's another alternative of chopping off some extensive weight. I have inquired about the posibility of molding certain exterior parts with aviation carbon fiber. Is it possible? Absolutely. Cost? Well......to do the hood....parts alone...not including labor...$9,000. Hood,fenders and rear trunk $22,000..molds and labor..30 grand...total weight of all ACF parts, about 45 pounds and guaranteed to withstand over 900mph...lol

Since there's a mention of weight savings in this most recent thread here's another alternative of chopping off some extensive weight. I have inquired about the posibility of molding certain exterior parts with aviation carbon fiber. Is it possible? Absolutely. Cost? Well......to do the hood....parts alone...not including labor...$9,000. Hood,fenders and rear trunk $22,000..molds and labor..30 grand...total weight of all ACF parts, about 45 pounds and guaranteed to withstand over 900mph...lol

30 grand buys you a nice fast car.
a jaguar
http://cgi.ebay.com/ebaymotors/Cars-Trucks___LOW-MILES-CONVERTIBLE-EXCELLENT-CONDITION-CLEAN_W0QQitemZ320287689092QQddnZCarsQ20Q26Q20Truc ksQQddiZ2282QQcmdZViewItem?hash=item320287689092&_trkparms=39%3A1%7C65%3A3%7C240%3A1308&_trksid=p4506.c0.m245
a vette
http://cgi.ebay.com/ebaymotors/Cars-Trucks___2005-Chevrolet-Corvette-Every-Option-Silver-Bullet_W0QQitemZ200246786970QQddnZCarsQ20Q26Q20Tru cksQQddiZ2282QQcmdZViewItem?hash=item200246786970&_trkparms=39%3A1%7C65%3A3%7C240%3A1308&_trksid=p4506.c0.m245
another vette
http://cgi.ebay.com/ebaymotors/Cars-Trucks___Magnetic-Red-Convertible_W0QQitemZ230280577077QQddnZCarsQ20Q26Q 20TrucksQQddiZ2282QQcmdZViewItem?hash=item23028057 7077&_trkparms=39%3A1%7C65%3A3%7C240%3A1308&_trksid=p4506.c0.m245
another z06 6speed
http://cgi.ebay.com/ebaymotors/Cars-Trucks___04-Chevrolet-Corvette-Z06-Silver-Black-6-Spd-LOW-RES_W0QQitemZ230279807148QQddnZCarsQ20Q26Q20Trucks QQddiZ2282QQcmdZViewItem?hash=item230279807148&_trkparms=39%3A1%7C65%3A3%7C240%3A1308&_trksid=p4506.c0.m245

22000 for jut the hood made by Alpina and you must have a real alpina with a vin match to purchaise it

Many years ago, Dinan took the time (and someone's money) to lighten up the E31. They used copious amount of carbon fiber, truck, hood, bumpers ditched the head light buckets, light weight cats and exhaust, drilled large holes everywhere that was deemed not structural or would not compromise the structural integrity. They lightened the doors, changed the seats, the list is very long.

For all that, the weight of the final product was right around 3700 lbs. The car sold in the last couple of years in the Bay Area and is still on the road AFAIK.

There are some major weight contributors in the E31 that probably can not be practically changed. The rear subframe, diff and suspension components weigh well lover 500 lbs. The V-12 fully dressed out but dry, weighs 585 lbs. The six speed trans is 150 lbs dry. The body is extremely heavy BUT, for a "B" pillarless coupe, it is one of the strongest with excellent crash resistance. We lost a E31 a few years ago in the SSCC, went off the road at high speed and did many roll overs, every body panel was damaged but the roof didn't collapse much and the driver walked away. His navigator was hurt but reportedly not badly hurt, a testament to the strength and of course the weight of the chassis.

Cars are designed and built for a purpose, The E31 was for a comfortable high speed cruiser, with a fairly high torque engine, To convert this to anything other, is alot of work and may just destroy some of its finest attributes.

The basic chassis and drivetrain weight is what kept the E31 off the race circuit, just way to much work and expense when other chassis were more available and less expensive to make competitive.

The E31 has never been a race car. If you want to go fast in style and comfort - the E31 is for you. If you want to go quick, take $25,000 and buy a low mileage Corvette.

22000 for jut the hood made by Alpina and you must have a real alpina with a vin match to purchaise itSomeone at the German E31 board recently inquired Alpina and a new hood goes for 5.400 euro and you don't need any Alpina identification or VIN. But even so, that's an insane price...

[quote=MWrench;13984923]
Cars are designed and built for a purpose, The E31 was for a comfortable high speed cruiser, with a fairly high torque engine, To convert this to anything other, is alot of work and may just destroy some of its finest attributes.

I agree Ed... and it's going to be a bummer in the future when looking for a nice example of an 8 and only find ones that are either badly maintained or chopped up. Don't mean to offend anyone, and hope I don't. IMO it is what it is ... a GT.

As far as batteries go, mine came with Interstate's when I bought it. I drive it on occasion and never have a problem with them draining ... vroom vroom fires right up all the time every time.

Yo,
Rod

One of the local guys up here in Portland tried tracking his E31 a couple of times. His answer was to subtract 1 and it seems to worked out for him :)

His E30 track car is now his baby and his E31 is for sale :(

For one i would never try to hack up the body on this car.End of story.
but if i can cut a couple 100Lbs here and there what the hell is wrong with that???
To me it seems like everyone except for a few of you is afraid or steping out and trying something new.
Why? If it works and we or ME want to share this experince with other people dont discourge it All of a sudden everybody piles on and says aww that cant work, nooo dont do that when they them self havent tryed it.
Have some stones seems like the getalong gang sometimes i wonder.
I have always said i would do a combo of things to this car to update it and lighten it ,I could have went corbonfibre seats but that looks like shit or manuel E36 seats to really cut weight and still be comfy, But i choose the M3 lux seats.I am the type of person that i have to see for my self that it didnt work and when all is done i will weight this car with a Quarter tank of gas and i will post it here.

You will have to change the timming and fuel curves if you add PSI no matter what (unless you want a complete meltdown). It is common Knowledge/practice in the drag racing world that for every 100 pounds of weight you lose you shave a tenth (1/10) of a second off your 1/4 mile time. not enough to notice in our case. A difference in shift points, driving style, weather and or elevation will make a bigger change than your spare and battery swap. Im not sure it will be worth the time and $$ invested especially as sensitive as our cars are with battery charge/reserve. CCA is usually not the issue.
Since you own a turbo i take it that you know as boost increases you will have to back off timing.Right.
So what do you think the chips that are around for our cars do???
these chips are not setup for turbo APPlication they are for N/A
So the timming will be agressive, Fuel will need to richer that is tru but messing with the chip isnt the only way& FYI from the battery and seat changes i will save at a min 100LBS and drag racer would love to do that if they could.Lets talk can do and not cant do.:alright

"Lets talk can do and not cant do."

"I am the type of person that i have to see for my self that it didnt work and when all is done i will weight this car with a Quarter tank of gas and i will post it here."

What and how are we supposed to reply to your posts?? Or should we even bother??

I think most here have been tying to be helpful and offer vast knowledge and experience from a pool of years of experience, but you don't want to hear that??!! Do you believe in reality? Or fantasy?

You didn't want to hear that you can't increase the valve size in the heads! Have you done it? Found someone to do it? What are the gains and what are the downsides? Haven't seen a post about that yet. Have you even checked with other people that have intimate knowledge of the heads and what can or can not be done?

A couple of hundred pound loss? What in the world will that do for you?? Single battery? Guess BMW didn't really know what they were doing!!??

Enlighten us, what are we missing?



OK,

Thats what we are here for ,listen and learn i am mistaken? I am not going to mess around with the motor we are not talking about that in this post so why bring it up?
If you dont know how to respond to my post how is that my problem?
Im simply stating the facts That my 850 runs good with 2 Huge batterys from the 90's technology and it will also run fine with a 1 high tech battery from 2008 and is lighter because of it.

BTW is anyone ELSE here running on a single battery or am i the only NUT.

dual battery here - makes lighting the fire oh so much easier... :)

...besides, what am I going to do with the added space and reduction in weight of 25 lbs?? Seems like a great place to store the Armorall...

:)
thx
Guess it depends on the batterys you have...this is the one i have and i know its more than 25Lbs

dual battery here - makes lighting the fire oh so much easier... :)Classic, But i will not laugh!

Im not going to put a single battery I am going to put 4 of those batteries since they are supper light weight and Im going to load my car with electronic...and appliances maybe an electrical motor too why not

Dishwasher?

I am with Mwrench you really dont care to listen and read between the lines sir hotrod. Its your car do whatever the hell you want to do with it and if you make any real world headway please enlighten us less versed than you. By the way it was you that initiated this discussion about your motor, (your quote: "Well heres the debate in side my head if i chip not i know it will afect the advance curve... so when i got the chance to turbo it up it will be.. too advanced. So im holding off on that for now Id rather go for the added psi then not with too much timing").
I was simply implying that no matter what when you add psi (if you ever do) you will have to modify your fuel and timing anyway so why not chip for now and get some real world gains immediately? They will be better than your spare tire and battery game.....you will never notice a tenth of a second difference but you will notice being stranded at the mall waiting for a jump if you have voltage issues........never mind, go for it.

I have those autolite and they seem to last 1 year

what a piece of junk I put in my car and I Carrie around

lol

I will get me a nice set of super huge crank amps and super light cause I love my car and I will try to forget I had those ugly pieces around

Well heres the debate in side my head if i chip not i know it will afect the advance curve... so when i got the chance to turbo it up it will be.. too advanced. So im holding off on that for now Id rather go for the added psi then not with too much timing.
You going to leave fwy 2.75 gears on that turbo? Try 3.73 or 4.11 ratio first!

Thats what we are here for ,listen and learn i am mistaken? I am not going to mess around with the motor we are not talking about that in this post so why bring it up?
If you dont know how to respond to my post how is that my problem?
Im simply stating the facts That my 850 runs good with 2 Huge batterys from the 90's technology and it will also run fine with a 1 high tech battery from 2008 and is lighter because of it.

BTW is anyone ELSE here running on a single battery or am i the only NUT.
At the drags a 13 second car and a 14 second car running side by side are very close! one second behind! a blink! Sure its alot to a racer but so is 1\1000 of a second!! I have seen plenty won by such margin! In the real world that second slower car is on your butt! Plus removing weight from the rear of a front engined V12 car with rear wheel drive only is retarted!

Classic, But i will not laugh!


Why not? I did (but only after it was back in form)

Well i hate to say i told ya soo but ...ya i did!
48.8Lbs each battery almost 100Lbs with 2
keeping the 21Lbs battery thats around -75Lbs
from the batterys alone.
Any questions?
BTW this isnt a quarter mile car and i dont want to be.
:redspot
PS
why in the hell would i messaround with the gearing if i am talking about weight???
also 4.10 gears on the street and freeway??? thats nutty

From somewhere in the how and why of 8 series development I got the impression that part of the rationale for the two huge batteries was to improve front to rear weight balance to nearer 50/50 and to improve/maintain the side to side weight balance.

So if that is true then lighter or single batteries could affect the balance of the car?

The E32 7 series has only a single battery located in front of the axle under the rear seat. It is on the passenger side of the hump presumably to offset the weight of the driver. It has less capacity than the pair of batteries in the back of the 8 and not too many fewer current drawing electronic toys. So then why the big dual batteries in the 8 if not for balance?