i was at work today and i walked past a cart full of what looked like small car batteries ...i picked one up and i was like damn thats light...290 CCA 12v and about 10lbs or less for 20$ ...these are tractor lawn tractor batteries...wonder if the 290's enough...maybe just for track day ?

 

I'm sure somebody could try it. My guess is it won't crank it over. Aren't the Optima batterys supposed to be lighter?

 

optima weighs close to stock.


for $20, you should get one and try it TypeR.

 

im gonna...shit i can return it if it doesnt work

 

Or double up for more juice and still weigh way less.

 

cant you just start the car, then take the battery out, like manual cars?

 

The biggie is going to be when it is hot . . . that's when I had most of my problems getting a car to fire . . . of course I was running 11.25 to 1 compression . . :P

I'd bet you could find smaller batteries that are in the 350-400CCA range and still weight a lot less.

Ruf

 

You can do that w/ just about any car...auto or manual...but whats the point??

 

a friend of mine has one of those in his rx7. its enough to start the car.

 

umm cause he wanted to save weight at the track maybe????

 

oh wait nm. they probally wouldnt let you run. but just put the cover on it. and they would never know lol

 

NO

your battery is also engineered to act as a capacitor. You would allow all of your electronics be wide open to a voltage spike. I.E. cooling fan turning on and off would produce a spike.... pressing the brake pedal...

Enough of a spike and you coulf fry your ECU.

You could replace the battery with a large capacitor once the car is running. Which would be lighter...

Although mot newer electronics are pretty good handling voltage spikes I wouldn't play with fire...

 

Don't you mean when it is COLD, not hot?