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displaying posts 1 to 11 of 11
| Author | Subject: Battery to boot cable size |
 pugheaven
Seasoned Pro  Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #1
Hi, iv done a search and found alot of it usefull, however im still unsure what spec cable to go for.Im looking at using 175 amp 25mm cable from battery + to the kill switch in the engine bay then use same size as before for the starter, fuse box .. Is the 175 amp 25mm cable ok to use, or is it over kill? Thanks Ollie |
 Posted 16th Oct 2009 at 01:16
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mr swampy s16
**BAD SELLER**  Location: out and about Registered: 22 Oct 2003 Posts: 10,550 Status: Offline |
Post #2
135amp is fine. |
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Posted 16th Oct 2009 at 01:49
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #3
Thanks |
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Posted 16th Oct 2009 at 01:55
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farmer
Seasoned Pro  Location: Southend On Sea Registered: 20 Aug 2005 Posts: 2,245 Status: Offline |
Post #4
I dont think you will get 175A from 25mm cable tbh, not without damaging it! perhaps for a very very short periord it may be ok, but I personally would be running a 50mm cable in for a battery relocation (0awg).25mm cable is about 120A rated tops I would say, even for tri-rated (fine stranded) I know that would be fine to run the car, but the cold cranking current can run into very high numbers, added to the fact that the high current draw will increase the volt drop for the cranking period, so the battery will be having to work harder. ________________________________________ Long live the Sigma 6 Team Phase 1 supercharged XBL ID: farmer uk1 |
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Posted 16th Oct 2009 at 02:48
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mr swampy s16
**BAD SELLER** Location: out and about Registered: 22 Oct 2003 Posts: 10,550 Status: Offline |
Post #5
135amp is 20mm square and will be more than fine. |
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Posted 16th Oct 2009 at 02:54
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #6
Just looked on ebay and you can get 170 amp 25mm2 or 135 amp 20mm2.Think im going for the 135 amp 20mm. Think 0 gauge would be over the top, bmw's like the 8 series only had 25mm2 cable going from bonnet to boot. Looking at getting mine from http://www.kojaycat.com |
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Posted 16th Oct 2009 at 02:58
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phillipm
Seasoned Pro  Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #7
For that running length I'd be using at least 170amp otherwise the voltage drop in winter may become an issue.________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 16th Oct 2009 at 03:01
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #8
Will it be a prob if i do have a larger dia cable than needed? |
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Posted 16th Oct 2009 at 03:04
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jonnie205
Seasoned Pro  Location: Bicester Registered: 10 Apr 2005 Posts: 4,146 Status: Offline |
Post #9
In the rally cars we run 30mm, this is more than enough and starts high compression pinto engines even when they are hot and compression is sky high |
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Posted 16th Oct 2009 at 03:04
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phillipm
Seasoned Pro Location: Rotherham Registered: 15 Oct 2006 Posts: 20,607 Status: Offline |
Post #10
pugheaven wrote: Will it be a prob if i do have a larger dia cable than needed?  ________________________________________ - Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM meEmail me! Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces. |
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Posted 16th Oct 2009 at 03:04
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #11
Didnt think so, 170 amp 25mm it is then.Only down side more |
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Posted 16th Oct 2009 at 03:05
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