Hey everyone.

Since i put my battery into the boot, i've been having problems with starting. I was told i need a booster relay, as the voltage drop across the extended cable is too high. Anyone know about those booster relays? and where can i get one from?

Thanks in advance

i could be WRONG but i work out, there is less than 3% voltage drop on your 4gauge wire

so i dont think thats your problem with your car starting

also Jowet used 4gauge to wire his battery to the boot with NO problems

Simon has the same problem as youself BUT his battery is in standard postion

i have my battery in the boot and NO problems

sorry dont no anything about boosters beside they do exist

check the voltage at the battery and then at the end of the 4 gauge wire, I'd be very surprised if there is much of a drop. If there is I'd be inclined to think that either the wire is dodgy or there's a shlight short somewhere along the line.

Alan, Jowet has the same problem. He told me about it before he left for melbourne and he got it checked out from mitsubishi and they recommended it.

Also, you have a bigger battery which can sustain the voltage for longer. I dunno. Im just trying what was recommended. Once i have this booster thing installed, i will see if it made a difference. They can't be that expensive.

Alan, Jowet has the same problem. He told me about it before he left for melbourne and he got it checked out from mitsubishi and they recommended it.

Also, you have a bigger battery which can sustain the voltage for longer. I dunno. Im just trying what was recommended. Once i have this booster thing installed, i will see if it made a difference. They can't be that expensive.


fair enough when i ask him about the battery long ago he said he had no problems

a cheaper option maybe just to add addition 4awg power cable to lower the voltage drop, but its up to you

you should move the battery back too the front and see if the problem stops

The voltage drop needs to be measured when cranking the engine - not steady state - voltage drop will be at its greatest when the most current is drawn.

Booster relays are used when you cannot get enough voltage to the starter motor solenoid.

4GA is far too light to run from the rear to the front - I would use either 2 or 1 myself, with a distribution block and battery isolator. And a fuse.

A bigger battery gives you more reserve capacity (ie voltage drops slower) under load.

Cheers
Heath Young

Well i was told the 4GA was big enough as the original connector to the battery at the front was around 4GA.
Anyways, im using a Odyseey Drycell battery (http://www.odysseybatteries.com/battery/pc680mjt.htm) which has more cranking amps than a standard car battery. But yeah. So you think using thicker cable may be a solution? Hm....

Might hook the battery up at the front and see if it does the same thing still...

Might hook the battery up at the front and see if it does the same thing still...
yes do that the 4ga is more than enough for your amps and the battery is small so it will fit in the front with your pod there

Well i was told the 4GA was big enough as the original connector to the battery at the front was around 4GA.

The 4GA at the front only has to go a few feet - the longer the cable, the greater the resistance and the greater the voltage drop. 4Ga may be fine for 3 feet, but 5 metres will drop a few volts...



Anyways, im using a Odyseey Drycell battery (http://www.odysseybatteries.com/battery/pc680mjt.htm) which has more cranking amps than a standard car battery. But yeah. So you think using thicker cable may be a solution? Hm....

Might hook the battery up at the front and see if it does the same thing still...

Oddessy batteries have a higher CCA (they are often used for electric vehicles as they have a lower internal resistance - the motors draw a lot of amps, and would boil conventional wet lead acid batteries) but the downside is that they have a lower reserve capacity (this is something that they do not really like to talk about.

A high CCA is fine and dandy if you can get the amps there, but when you are running through a high resistance connection (relative to the old setup) you aren't going to be using them anyway...

I am sure that the better cable would be a solution. Last car I fitted a battery in the boot for was using DC welding cable - cheap, tough and flexible, much cheaper than car audio cable too IIRC.

If you use the battery in the original spot and still have the problem, you could have a crook starter motor solenoid (or the contacts are stuffed). Rebuilt a few of them too...

Cheers
Heath Young

Heath can you tell me how much current draw, when starting the car??


I am sure that the better cable would be a solution. Last car I fitted a battery in the boot for was using DC welding cable - cheap, tough and flexible, much cheaper than car audio cable too IIRC.

also welding cable is not always cheaper, also thick gauage like 2-0 is hard to fine

if you can source them cheap and thick can you please point me in teh right direction

thanks

Starter draw - depends from car to car (things like battery voltage and compression ratio, engine wear etc) but 200-250A is not unheard of.

I used 1-0 from a Simsmetal (scrap metal) dealer, you buy it by the KG, but you can pick up from welding suppliers at not too bad a price.

Cheers
Heath Young

thanks for the info Health

thats explains Elements voltage drop on 4ga cable i thought it would be around 100 amps which should be no problems

al... i picked up some 0awg welding cable the other day for my new stereo. cost me bout $8.75 p/m. just look up welding suppliers in the phonebook and check this site for the sizes. (Welding supliers don't know awg sizes so u have to ask for the mm2)

http://www.kodiakbs.com/Techinfo/wire.htm


Tim

Starter draw - depends from car to car (things like battery voltage and compression ratio, engine wear etc) but 200-250A is not unheard of.

I used 1-0 from a Simsmetal (scrap metal) dealer, you buy it by the KG, but you can pick up from welding suppliers at not too bad a price.

Cheers
Heath Young

Would that explain why my 150A fuse burned out this morning?