running without a battery
 

I am thinking about running with a really small battery for weight reduction, but I'm worried that it
Oght make less power or won't run right with the reduced battery power. How much does the battery effect how the car runs. I plan to use a jump box to start the car and it will be a dediated track car so headlights and things like that aren't an issue

Re: running without a battery
 

i'm not sure about the exact voltage levels while the car is running without a battery hooked up, but in theory, the alternator should put out 13+ volts. if you mean track, like drag strip id say you're fine. road course, you better have a way to start the car incase you stall it when you spin out, etc.

i'll tell you what, i'm interested in this info too, so when I get home, i'll do some testing with a volt meter and the battery terminals unhooked.

Re: running without a battery
 

it will auto-x and drag. Restating shouldn't be an issue since I won't be far away

Re: running without a battery
 

gotcha, i was thinking along the lines of roadcourse where you would be hurthing

Re: running without a battery
 

I just checked the weight and the battery I plan to use is 20lbs lighter and I get them free from work

Re: running without a battery
 

you get free batterys at work?
i want one :l

Re: running without a battery
 

I get used airplane batteries for free. The ones I get are sealed too so they can be mounted anywhere. The free ones that I get that I plan to use in the race car are secondary batteries. All of the batteries i get are replaced every 2 years weather they need it or not so they usually last 2-3 years after I get them.

Re: running without a battery
 

ill send you money for one of those batteries. you will be fine running with no battery i have done it before in my crx. the alternator should be around 14.5 volts so once the car is running it does not need the battery. and if your worried about voltage drop when hitting the gas maybe get a capasitor to help out. but if your alternator is working good then no need for a battery

Re: running without a battery
 

yea i just got a free Odyssey battery from my dads RV6a, i guess in an airplane you wouldn't want to run the battery till they die, lol

Re: running without a battery
 

Im using a odyssey PC680... It doesnt weigh ----, is really small and I have a small system in trhe car (JL 10 and Fosgate 200 watt amp). It has yet to let me down... Even in the EX Accord with power everything.

Do it.

http://www.batterystore.com/Odyssey/...0MJT_large.jpg

Re: running without a battery
 

Huh...that's good to know...

Re: running without a battery
 

its not as crucial as you think. the magnetos make their own spark so work case is you would lose your radio if for some reason your alternator died and your battery died.

i will take a pic of the battery i am going to use. it only weighs 5lbs. and its sealed so it can be mounted anywhere and in any postion

Re: running without a battery
 

sell me one man. im over here trying to give you free money

Re: running without a battery
 

+1

Re: running without a battery
 

got a pic of the battery you are gonna sell these guys? i want one.

Re: running without a battery
 

he hasn't agreed yet but im going to bother him until he does

Re: running without a battery
 

what do you want, the full size start your car battery, or the 5 pound battery? i am very limited on how many full size i can get, but i think i have like 6 of the small ones

Re: running without a battery
 

how much for a small one shipped to san diego?

Re: running without a battery
 

yea but what if the engine stalled mid-air and they wanted to restart it?

Re: running without a battery
 

you ever head of windmilling???


and it got dark before i could do anything. ---- winter and it being dark when i get home from class

Re: running without a battery
 

i need a fullsize one how much do those weigh

Re: running without a battery
 

dive
im not sure, i weighed a 24v one today wich felt about the same as a car battery and it was 25lbs. the 12v ones are probably 20lbs

i dont know, i will have to check on the legalities of shipping a battery

Re: running without a battery
 

I've been running this battery for almost 2 years on the street day and night. I even have 1000watts of sterio and I've never had a problem with it. Best battery I've ever bought. I just installed one in a kit car and my moms escort yesterday thats how much I trust them.

Re: running without a battery
 

Push start that ----.

Re: running without a battery
 

The battery is a storage cell for cranking the car, and the alternator is what supplies power to the system. I wouldn't run without a battery, though.

I have little love for those Odyssey batteries. They are a lot heavier than an equivalent-power lead-acid lawn mower battery, and about the same size. And they drain really fast, hook up a laptop and a wideband to the system and leave the engine/alternator off for 5 minutes, the car won't crank. Add in the $$$ pricetag and ---- those things. Even $50-something for the exact same thing in generic brand is a premium.


MISTER PHILL.... what is the amp rating of those 5lb units, and might I obtain one? :)

Re: running without a battery
 

i wont be able to find out anything about them till tuesday. i am getting married tomorrow and my life is a huge mess till monday night when everyone goes home. the batteries are at work and i am off today-monday.

i will see what the deal is with shipping batteries along with any info i can find on them

edit, they are exactly the same thing as this battery, but without the label
http://www3.towerhobbies.com/cgi-bin...?&I=LXL370&P=M

Re: running without a battery
 

Quoted for truth. :P

Re: running without a battery
 

7 Amps per hour isn't going to turn over a car engine. With a good starter (no worn/binding bushings) and good power/ground system you will need a minimum of 180 amp battery to crank the car, and then the battery has to be fully charged and it can't be cold out. I have a 225 amp lawnmower battery in my drag car, FYI.

If you put external battery terminals on your chassis, like you see drag cars do, and connect them to a jump box everytime you need to crank... that battery might work to preheat your wideband before you crank the engine over. :P

Re: running without a battery
 

JD, reading seems to own you lately.

i also dont plan to run a wideband once the car is tuned and i can tune it with a full size battery in it. do i even need to run a battery at all? thats another 5lbs i can save. this race really has no rules

Re: running without a battery
 

Like I told Leroy yesterday, I'm running a bit of a fever and dropping the ball on simple ----.

Re: running without a battery
 

ok.

Re: running without a battery
 

ok

Re: running without a battery
 

what do you think about no battery at all? i have heard of burning up alternators cause they work too hard with no battery, kinda like over spinning a turbo when you have a big boost leak.

i dont know if thats true though. i have never run a car long with no battery. only long enough to see if the engine would die to diagnose a bad alternator with no tools

Re: running without a battery
 

I don't think it burns up anything.

I advise against it. If you stall the vehicle, with the small battery you can at least roll the car off.

Re: running without a battery
 

when i worked at pizza hut 9 years ago we had a driver that needed a new battery. he had someone jump his car in the morning and drove it around all day with no battery. he just kept the car running the whole time.

Re: running without a battery
 

If it is a gm car the CS and CSD type alternators burn themselves up regularly with a battery in the vehicle. Running without a battery in these cars not a good idea.
Hopefully you are alking about a honda.

Re: running without a battery
 

No, we're discussing a 1932 Hupmobile.

Re: running without a battery
 

have you ever thought about an alternator kill switch? less drag on the engine might be worth more at the strip than the weight savings


just an idea, so go ahead and flame away if you want

Re: running without a battery
 

some circle track cars use a 16 v system where the vehicle runs off a 16v battery but w/o alternator the idea is with battery low it will still have 12v output.
But I think honda ecu's have input voltage from alternator if memory serves me right.

Re: running without a battery
 

I guess I will check into what real race cars do and copy that. The alternator kill swith makes sense, but I wonder where I would get more benefit. The engine would still be turning the alt so it would only remove the load of charging. I think removing 20lbs might be better.