Discussion
Sounds baloney to me.
The difference is the size of the 'reservoir' as it were. Power rating and transfer in and out are regulated by the vehicle. Alternator runs whenever engine is running with power recharging battery and/or running the vehicle electrical system. Alternator/regulator will stop recharging the battery when charged.
The larger size doesn't mean the alternator is working any harder.
One one of my old cars the battery is nearly double the standard size, partly because I had it spare and partly as it takes some cranking on a cold winter morning to get going. Been on the car for years with no issue.
The difference is the size of the 'reservoir' as it were. Power rating and transfer in and out are regulated by the vehicle. Alternator runs whenever engine is running with power recharging battery and/or running the vehicle electrical system. Alternator/regulator will stop recharging the battery when charged.
The larger size doesn't mean the alternator is working any harder.
One one of my old cars the battery is nearly double the standard size, partly because I had it spare and partly as it takes some cranking on a cold winter morning to get going. Been on the car for years with no issue.
ilduce said:
I believe the gen 1 Cayman S has a 75ah battery as standard. According to my local OPC,the 80ah battery I fitted to it 2 years ago it could destroy the alternator.
They couldn't explain why, but it just would... because 80 is bigger than 75 (even though they are both 12v)
Please refute this with science facts that I can shake at them, as they are wrong.
No need - simply ask them to put their ramblings into writing. They won't able to - problem solved.They couldn't explain why, but it just would... because 80 is bigger than 75 (even though they are both 12v)
Please refute this with science facts that I can shake at them, as they are wrong.
Copy to the MD
Ask them why for some models Porsche offer(ed) an option of an uprated battery (with no other components changed).
I once owned the ex-Porsche press 996 GT3 Clubsport and one of the orignal factory options was an upgraded battery (I think it was 90Ah instead of 75, certainly a much bigger difference than just 5Ah). I don't know how many models this/was an option for, but it kind of refutes the nonsense they're spouting a bit, doesn't it?
I once owned the ex-Porsche press 996 GT3 Clubsport and one of the orignal factory options was an upgraded battery (I think it was 90Ah instead of 75, certainly a much bigger difference than just 5Ah). I don't know how many models this/was an option for, but it kind of refutes the nonsense they're spouting a bit, doesn't it?
ilduce said:
I believe the gen 1 Cayman S has a 75ah battery as standard. According to my local OPC,the 80ah battery I fitted to it 2 years ago it could destroy the alternator.
They couldn't explain why, but it just would... because 80 is bigger than 75 (even though they are both 12v)
Please refute this with science facts that I can shake at them, as they are wrong.
Absolute crap. they would rather you fitted their lower output battery for 3 times the price.They couldn't explain why, but it just would... because 80 is bigger than 75 (even though they are both 12v)
Please refute this with science facts that I can shake at them, as they are wrong.
James44 said:
Sounds baloney to me.
The difference is the size of the 'reservoir' as it were. Power rating and transfer in and out are regulated by the vehicle. Alternator runs whenever engine is running with power recharging battery and/or running the vehicle electrical system. Alternator/regulator will stop recharging the battery when charged.
The larger size doesn't mean the alternator is working any harder.
One one of my old cars the battery is nearly double the standard size, partly because I had it spare and partly as it takes some cranking on a cold winter morning to get going. Been on the car for years with no issue.
Anyone who told you that isn't fit to repair a car. The "reservoir" explanation is a good one. As an example I have a much higher than normal rated battery in my 996, so I can leave it stand for longer without charging. The only advantage with the smaller battery is lightness. My Hilux truck has two 12v batteries each of 80Ah. It will function with with just one, but with two giving 160 Amps it will stand idle for 3 months and still start in the coldest weather.The difference is the size of the 'reservoir' as it were. Power rating and transfer in and out are regulated by the vehicle. Alternator runs whenever engine is running with power recharging battery and/or running the vehicle electrical system. Alternator/regulator will stop recharging the battery when charged.
The larger size doesn't mean the alternator is working any harder.
One one of my old cars the battery is nearly double the standard size, partly because I had it spare and partly as it takes some cranking on a cold winter morning to get going. Been on the car for years with no issue.
They sound truly dreadful, and after this FOC work is done, I strongly recommend you try somewhere else?
It's almost as if they are trying to live-up to the stereotype of the worst way to run a service department.
I replaced one side's track-rod end in Feb 2011 - the other side is still absolutely fine. No-one can tell you how long each will last.
2xTRE means 2xparts and 2xlabour, there is no saving in getting them done at the same time, other than of course the GEO.
It's almost as if they are trying to live-up to the stereotype of the worst way to run a service department.
ilduce said:
The only thing I'll have to pay for are the 2 track rod ends but they're doing that for 250. I've had an independent tell me one was worn so they're half right and I suppose I might as well do both for the extra £50 in parts. I'd imagine the 250 would include a geo check but I'll check before I commit.
Reading back through that I have a feeling that they haven't really done me any favours.
That will not include the GEO, as a good GEO should cost around 200, as a good GEO will take a skilled mechanic a long time.Reading back through that I have a feeling that they haven't really done me any favours.
I replaced one side's track-rod end in Feb 2011 - the other side is still absolutely fine. No-one can tell you how long each will last.
2xTRE means 2xparts and 2xlabour, there is no saving in getting them done at the same time, other than of course the GEO.
ilduce said:
Well it's going in next week for all the repairs and I said "so I only need to bring £300 (250+50 for a tyre sealant that has expired) when I pick it up" and he agreed.
If that's the case it's a good deal, no?
Of course if not, and they try and charge for a geo, I shall tell the shiny suited cvn't where to put his TRE's.
Get a print out of the geo that they do.If that's the case it's a good deal, no?
Of course if not, and they try and charge for a geo, I shall tell the shiny suited cvn't where to put his TRE's.
Perfect - I'd suggest having a quiet word with the Service or After-sales Manager, just showing him this thread should do it, and ask for an apology and suggest that to make amends some form of compensation/gift/credit wouldn't go amiss, given that they would happily have lied to you and had you over to the tune of £250 or so to replace a perfectly good battery.
That's the Cold Crank Amps (CCA)
340 seems way too small for what's a relatively large engine.
Can't remember what's in my GT3 (though build sticker lists I ceased capacity battery code)
The Bosch S5 in the wife's X5 (3.0d) is 900 CCA, but obviously diesel needs slightly more power to the. It over with higher compression.
340 seems way too small for what's a relatively large engine.
Can't remember what's in my GT3 (though build sticker lists I ceased capacity battery code)
The Bosch S5 in the wife's X5 (3.0d) is 900 CCA, but obviously diesel needs slightly more power to the. It over with higher compression.
ilduce said:
The mystery deepens.
It appears that it's not the 80Ah that's the problem.
No. The problem is the other number on the battery.
740A.
It should be something like 340.
Any ideas?
Anyone with an original Porsche battery help me?
Sounds like they're back-pedalling somewhat to me and clutching at straws.It appears that it's not the 80Ah that's the problem.
No. The problem is the other number on the battery.
740A.
It should be something like 340.
Any ideas?
Anyone with an original Porsche battery help me?
please insert any extra metaphors here>>
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