battery size
 

what is the smallest and lightest battery the you can run on a midget with a ecotech and elec fuel inj :11:

Re: battery size
 

Red

You probably want to look into a couple of 14+ amp hour lithium ion motorcycle batteries. Probably a little less than 2 pounds each and they hold up real good. Use one for hot laps and heat, then put the fresh one in for the main.

The problem is you are powering a fuel pump, ignition system, and injection system on a total loss electrical system, and when the battery gets below 12 volts those electronics go crazy.

Some smart guy is going to look at the little generators used on John deer lawn tractors and put a timing belt pulley on one of them and drive it off the engine timing belt or maybe off the PS pump. Then you will be able to get by with one battery.

Honest Dad himself:6::6:

If you're running an ecotec, look up mwr's setup as they have an alt option. If you have the room, I'd run one if possible.

Re: battery size
 

The antigravity batteries seem decent although you need a charger that is made to charge lithium batteries. We run a AGM battery in the tq's we have to run a ignition and fuel pump with no charging system. When the batteries get low the ignition will start acting up, in the days of the lead acid batteries a rough track would crack a plate and cause all kinds of havoc! I know Literal racing in Fortville stocks the antigravity batteries, they've gotten popular with the tq guys.

Re: battery size
 

the only thing im running of this battery is the ecm and inj I have a manual fuel pump that is run off the motor

ECM and ignition probably pull 30-35A combined I assume? So a 300 battery should be sufficient maybe top up after heats before feature

Re: battery size
 

I plan on putting on charger in between heats and main which brand and size of battery yall think is best to go with also thanks for the help and info :6:

Re: battery size
 

12+ Ah will be fine something in that range should provide 300-400 cranking amps be able to supply safely supply 14 amps for an hour continously, which will be more than enough. If money is no object and you want super light weight ie:2-3lbs a lithium motorcycle battery will fit the bill just fine. The AGM type batteries are available at most powersports places like a cycle, quad dealer etc. They are cheaper but a little heavier. http://shop.antigravitybatteries.com...teries-ag1601/ would be a good lithium choice.

Re: battery size
 

I've had good luck with a MotoBatt brand battery, AGM, 18mo replacement warranty, available on Ebay, MBTX16U, same size as the old Honda, but 16ah. Had one go bad, after I left the ign on for 3 days, emailed em, sent in the required paperwork, and a thin plastic lid off the battery, and in less than a week, I had a new one to put in. Just another choice. Bob!

I run the agm style motorcycle battery and it just plug it in to a battery tender when I'm in the pits. It has worked well with injection, electric fan, fuel pump, starter, and lighted tach and cost effective. I think the batt is in the 525-625 range. It's the same size as my odyssey battery as well.

Re: battery size
 

got a odyssey pc925 on it right now was just looking for a lighter battery but need some thing that will last through a race

Re: battery size
 

Red

When you look and feel one of these little lithium batteries you say to yourself no way. But they really pack a lot of juice, so to say. Look at your drill or impact, there is no way 10 years ago they would work as hard and as long as they do today.

Now the reasoning for 2 batteries. You are running a total loss electrical system. Sure you may charge it for an hour or so between races, and that will probably be enough. When you run into a bunch of yellow flag laps or other delays in the race that charge may not have gotten the battery all the way to full charge. The engine will run fine for these caution laps, but I can't think of a worse feeling than being in front of the pack and when you get on the gas when they drop the green flag that old motor falls flat on it's face. Took me two times before I put a generator back on and haven't had a problem since.

The other reason is them batteries go bad ever so often and when they do it is nice to have a spare. I know a guy that was sitting in the chute on the front row for the start of the B main at the Chili Bowl and his battery takes a dump and no spare handy>

Honest Dad himself:6::6:

Re: battery size
 

so your saying need to run small alt what is the smallest one to get or if I get two batteries whats the best size to get

thanks

Re: battery size
 

Red

Somebody said someone already makes on in previous post. When You depend on electronics you need a good hot battery, when they fall off a couple of volts you got big problems. Murphy's Law states that you will be in front when it craps.

Honest Dad himself:6::6:

This is a very accurate statement. Nothing like standing on it and it feels like you hit the brakes instead..... :(