hi guys i own a sr20det s14a i want to relocate the standard battery to the boot just wondering if anyone has done this on here and what amp wire you used ? any help welcome cheers
Most people have I got 4 or 5m of 14mm red wire and 1m black wire joined it all up with a connect box and a few ring terminals from Vehicle Wiring Products Ltd. Suppliers of auto electrical parts. But I would get 6m next time and go for at least 20mm make sure you fuse it I used a in line fuse off ebay.
The fuse should be as close to the battery as posable do that if the wire earths out it dosnt burn out al the way through your car.
Ul need a fuse between 100-140a , I used a circuit breaker for my relocation, that's 140a and it's never tripped on me yet...10mm core cable should be ok for this , as the current only get pulled for a few seconds at a time.
My cables 10mm diameter copper core plus the outer wall, and I got virtually no drop at all, all tested on a volt meter too.....can be that 'no good.....'
cable with 25mm diameter is not a bit "too" thick? it's not that we're running high-voltage in cars or? about 10mm are the thickest cables i ever say in cars^^ (i could be wrong so don't point fingers at me guys,...!)
spoke to a auto electriction he say i need to use 240amp cable at least 35mm thick but he never metioned about fuseing the wire at all if you fuse the battery with a 140 amp fuse surely that might struggle to start as the cold cranking amps are 240 or is tht wrong
35mm thick .....fuc me u could run a town off that...lol , like I said, I use a 140a breaker and it never tripped ever even starting a brand new engine. The standard fuse is only around 100a anyway on the starter motor.
oh rite but if the starter motor is already fused why would you fuse the cables as the normal battery cable isnt fused until the fuse box and all you are doing is extending them sorry if i keep asking the same question lol i just want to understand why you would fuse it lol
You fuse it so if the live cable from battery from the rear of the gets cut and hits any metal it should trip rather than setting fire to your car.
Generall rule is fuse/breaker within 10 inches of the battery , like w2d just said it's only too stop ut motor going up in flames if the cable shorts somewhere.
I did mine the other weekend, used: 3 and a bit meters of 45mm 300amp cable and two 150 amp fuses. One under the bonnet and one in the boot about 10" away from the battery. I know the two fuses and size of cable I used are a bit overkill, better safe than sorry tho.
no its 12v.. your getting confused with mains electric.. to get the same power at 12v as you do at mains you need 20 times more current. hence you must run a large battery cable when extending the battery away from the starter motor. look at the skyline r33 front to back cable.. it is easily 25mmcsa edit.. to add. the starter motor is not fused on any of the s bodies or r32,33 or 34 bare in mind you will need around 200plus amps for cold cranking. a 10mmcsa cable is not rated anywhere near that.. i say pull your cas plug off and crank it for 30seconds and see how hot that cable gets.. volt drop at low voltage is vast.. thus the need for larger csa cables. you car might "work" but it is not right. and if there were such ruling to prevent mal practice in auto electrics then your install would be deemed dangerous since the cable is under rated. only recently have car manu been putting fuses on the main supply cable. (very slow acting fuse) the r33 does just fine without a main fuse.. i would recommend quick connect battery terminals tho.
Mines got a bigger battery than stock with 16mm that would be 7.5-8mm inner wire. Seems ok its got a low 145amp trip switch. cranked over in the -3 weather no probs.
if the wire is 16mm.. its not the outer diameter thats the cables cross sectional area.. 16mm tritrated cable (the very fine strand stuff) is approx rated at a constant 175A.. so in short burst (cranking) a 16mm2 cable is pretty closely matched.