[928uk] OT - Jump Leads charger Recommendation.

Wed Aug 31 15:55:19 UTC 2022

What's best really depends on how quickly you need to start it.

If you can wait a day or two, just reconnect the maintainer. If it can 
supply 2 amps, 24 hrs will give you 48Ah which will be more than enough 
to start the car as long is the battery holds most of what you pump into it.

If your maintainer won't charge a completely flat battery, (some won't), 
best bet is to connect the flat battery to a good battery with jump 
leads (no need to run the other car), leave connected for an hour or 
two, then connect the maintainer and disconnect the jump leads.

If the battery has been totally flattened for a while, it might not recover.

Smiffy

On 31/08/2022 15:51, Simon via 928uk wrote:
> Hi Al
> I presume you are talking about the Noco GB40 Boost Plus jump pack.
> Yes
> Really excellent. Also on Audi RS4 which is 4.2 litre V8.  Follow the instructions and make sure it is fully charged (which takes at least overnight).
> I think they are really excellent pieces of kit. I am always nervous about using jump leads in case you get a spike to the ECU.
> I would also charge your battery up first because although the GB 1000 will start a car with a fully flat battery, I believe it is best practice to protect the car’s electronics further by not using booster pack if the battery is completely flat if possible.
>
> I also have the Noco Genius 10 battery charger which is absolutely excellent as well.
>
> Halfords usually keep both in stock. No affiliation to Halfords or Noco.
>
> Alternatively, why don’t you disconnect the battery, charge it up in the normal way with a battery charger and then reconnect and start the car?
>
> Good luck and all the best,
> Simon
>
> Sent from my iPhone
>
> On 31 Aug 2022, at 15:33, Al Walter<alistairwalter at googlemail.com>  wrote:
>
> 
> Hi All
> Rolling back this thread
>
> Has anyone used the Noco 1000 charger on their 928 with success?
>
> I have a maintainer but it got disconnected and I need to start the car which hasn’t moved for a year.
>
> If not can you suggest a charger that will do the job?
>
> Al
> S2 slushbox edition
>
>
> On Thu, 4 Aug 2022 at 19:23, Jonathan Rackowe via 928uk <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>> wrote:
> No idea what you meant Simon. What you wrote was "The trouble with engineers is they spent far too much time analysing and picking at data and not enough time actually accepting that whether things work in  theory and practice are not always the same."
>
> Engineers analysing and picking at data and questioning the way other engineers have done things is what gave rise to the 928 that you seem to approve of and enjoy.
>
> You also wrote "I find it very boring when techies like you find fault with things or overcomplicate things unnecessarily because of their superior knowledge of engineering." You were right on one thing, that was rude. If you don't like something you read on the list, or have nothing relevant to add to the discussion, ignore it. The list has always been full of stuff that will only interest some people and not others.
>
> Best regards,
>
> Jonathan
>
> 928 GT 1991 Amethyst Metallic
>
>
>
> -----Original Message-----
> From: Simon <simon at acs-online.co.uk<mailto:simon at acs-online.co.uk>>
> Sent: 04 August 2022 19:03
> To:jonathan at rackowe.net<mailto:jonathan at rackowe.net>
> Cc: Simon Watson <simonwatson at unitelconsultants.co.uk<mailto:simonwatson at unitelconsultants.co.uk>>; Andrew Brierley <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>; George Layton <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; 928 UK <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
> Subject: Re: [928uk] OT - Jump Leads Recommendation.
>
> Hello. Everyone knows exactly what I meant! Right enough nitpicking: I am off for a drive in a 928 now! With superbly engineered Noco in the car just in case!
> Best wishes to all,
> Simon
>
> Sent from my iPhone
>
>> On 4 Aug 2022, at 12:54,jonathan at netvue.co.uk<mailto:jonathan at netvue.co.uk>  wrote:
>>
>> Please don't misquote me. I didn't say they don't work. I said the marketing claims on their spec sheet don't add up.
>>
>> Best regards,
>>
>> Jonathan
>>
>> 928 GT 1991 Amethyst Metallic
>>
>>
>> -----Original Message-----
>> From: Simon <simon at acs-online.co.uk<mailto:simon at acs-online.co.uk>>
>> Sent: 04 August 2022 12:35
>> To:jonathan at rackowe.net<mailto:jonathan at rackowe.net>
>> Cc: Simon Watson <simonwatson at unitelconsultants.co.uk<mailto:simonwatson at unitelconsultants.co.uk>>; 'Andrew Brierley' <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>; 'George Layton' <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; '928 UK' <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>> Subject: RE: [928uk] OT - Jump Leads Recommendation.
>>
>> Which is precisely my point. The Noco engineers who are specialists in their field have designed, tested and brought to market a product that does work really well. So it’s annoying when another engineer criticises it and says it won’t work, particularly when they haven’t even seen or used the product themselves!
>> They do work and they are really excellent. “Period” as the Americans say.
>> Often when engineers go into too much intricate detail on a simple topic on a forum it can be annoying, but I appreciate people looks at things differently and we have to cater for everybody!
>>
>> One thing we all have in common is we all love our 928s!
>>
>> Best wishes, Simon.
>>
>> -----Original Message-----
>> From: Jonathan Rackowe <jonathanrackowe at gmail.com<mailto:jonathanrackowe at gmail.com>> On Behalf Of jonathan at netvue.co.uk<mailto:jonathan at netvue.co.uk>
>> Sent: 04 August 2022 10:34
>> To: Simon <simon at acs-online.co.uk<mailto:simon at acs-online.co.uk>>
>> Cc: Simon Watson <simonwatson at unitelconsultants.co.uk<mailto:simonwatson at unitelconsultants.co.uk>>; 'Andrew Brierley' <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>; 'George Layton' <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; '928 UK' <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>> Subject: RE: [928uk] OT - Jump Leads Recommendation.
>>
>> Some people believe in magic!
>>
>> Engineers are the people that make the technical world work for you and keep you safe. Have some respect Simon.
>>
>> Best regards,
>> Jonathan
>>
>>
>>
>>
>> -----Original Message-----
>> From: Simon <simon at acs-online.co.uk<mailto:simon at acs-online.co.uk>>
>> Sent: 03 August 2022 17:52
>> To:jonathan at rackowe.net<mailto:jonathan at rackowe.net>
>> Cc: Simon Watson <simonwatson at unitelconsultants.co.uk<mailto:simonwatson at unitelconsultants.co.uk>>; Andrew Brierley <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>; jonathan at netvue.co.uk<mailto:jonathan at netvue.co.uk>; George Layton <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; 928 UK <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>> Subject: Re: [928uk] OT - Jump Leads Recommendation.
>>
>> Jonathan. The trouble with engineers is they spent far too much time analysing and picking at data and not enough time actually accepting that whether things work in  theory and practice are not always the same.  These Noco devices are incredible and they do work irrespective of your data analysis. I have two to prove it.
>>
>> Up to 20 indeed might not mean 20. Unless there were lots of starts on small engines where the battery was not too flat.
>>
>> The cables are thick and even when I was cranking that big V-8 in the winter time they took the current just fine.
>>
>> There’s a guy in Alaska who has lots of big old V8s. Noco asked him to test a device and I think he started about five or six cars that had not been started for a very long time and had flat batteries and it was way below freezing in the Arctic. And he was being honest, not being paid to say they were good.
>> You can find this and other tests online
>>
>> Anyway forgive me for being what you probably think is rude, but I find it very boring when techies like you find fault with things or overcomplicate things unnecessarily because of their superior knowledge of engineering. I know many people agree with me on this. These Nocos are an example of a very good product that actually does work extremely well in practice.  Why not accept that unless you have actually tried one yourself and proved otherwise?!
>>
>> Anyway let’s enjoy our 928s……!
>>
>> Simon
>>
>>
>>
>>
>>> On 3 Aug 2022, at 15:29, Jonathan Rackowe via 928uk <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>> wrote:
>>>
>>> The spec sheet for that Noco GB40 device gives charging info that tells us it has a 6Ah (Ampere-hours) capacity. That equates to 360 Amp-minutes capacity.
>>>
>>> So if you believe that its cables can really handle 1000A it would crank at 1000A for 22 secs. I suspect that more realistically it would provide 500A for 30 secs or so. Could be enough to restart a 928 if the battery is not totally flat.
>>>
>>> Don't know how Noco justify their claim that it gives up to 20 starts on a single charge, apart from the fact that up to 20 could include just 1!
>>>
>>> Best regards,
>>>
>>> Jonathan
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: 928uk <928uk-bounces at lists.928.org.uk<mailto:928uk-bounces at lists.928.org.uk>> On Behalf Of Simon Watson via 928uk
>>> Sent: 03 August 2022 14:50
>>> To: Andrew Brierley <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>
>>> Cc: George Layton <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; 928 UK <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>>> Subject: Re: [928uk] OT - Jump Leads Recommendation.
>>>
>>> + 1 Andrew!
>>> Simon
>>>
>>> -----Original Message-----
>>> From: Andrew Brierley <brierley28 at virginmedia.com<mailto:brierley28 at virginmedia.com>>
>>> Sent: 03 August 2022 14:34
>>> To: Simon Watson <simonwatson at unitelconsultants.co.uk<mailto:simonwatson at unitelconsultants.co.uk>>
>>> Cc: George Layton <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>; 928 UK <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>>> Subject: Re: [928uk] OT - Jump Leads Recommendation.
>>>
>>> I would also recommend Noco GB40, I carry a pack in each car.
>>> Regards
>>> Andrew
>>>
>>>>> On 3 Aug 2022, at 14:26, Simon Watson via 928uk <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>> wrote:
>>>> Hi George
>>>>
>>>> I spent a lot of time researching this a few years ago & am happy to share my findings.
>>>>
>>>> Firstly you need a battery of around 600+ CCA Cold Crank Amps for your GTS.  340 CCA is piddly.
>>>>
>>>> Secondly many jump leads are misleading.  I got some off Amazon & they looked great, but they were a con because the rubber was thick, but the copper wire strands were piddly & melted on attempting to starting a V8 (not a 928).  They were total rubbish.
>>>>
>>>> You need ideally 25mm copper core or more.  Good insulation and strong insulated clamps.
>>>>
>>>> The best ones for really good value price & high quality are as below at Halfords.  I have both and they are beautifully made, thick copper cores, superb insulated clamps.  I wish I had found this out at the start of my research!
>>>> Look no further.  Seriously.
>>>>
>>>> Jump Leads Halfords:
>>>>
>>>> 3.5 metre length.    25mm copper core diameter
>>>>
>>>> https://www.halfords.com/motoring/battery-maintenance/jump-leads/halfords-up-to-3.5l-jump-leads-438478.html
>>>>
>>>> £21.99
>>>>
>>>>
>>>>
>>>> 4 metre length.   35mm copper core diameter
>>>>
>>>> https://www.halfords.com/motoring/battery-maintenance/jump-leads/halfords-up-to-4l-jump-leads.-438486.html
>>>>
>>>> On offer £24.99
>>>>
>>>>
>>>> Also consider Noco GB40 or Noco GBX45 small booster packs also at Halfords.  Both are excellent, small portable booster packs.  I could not believe how good they are, I have one of each.  American & beautifully made & they really work well.
>>>>
>>>> On all above, if you have a Halfords Trade card they may be cheaper.
>>>>
>>>> No affiliation with Halfords.  Just passing on high Simon recommendations.
>>>>
>>>> Hope that helps.
>>>> All the best
>>>> Simon
>>>>
>>>> -----Original Message-----
>>>> From: George Layton <George.Layton at ukgateway.net<mailto:George.Layton at ukgateway.net>>
>>>> Sent: 03 August 2022 13:14
>>>> To: 928 UK <928uk at lists.928.org.uk<mailto:928uk at lists.928.org.uk>>
>>>> Subject: OT - Jump Leads
>>>>
>>>> Hi Chaps - A bit of help required from the collective wisdom of the list.
>>>>
>>>> I need to buy some new jump leads as mine are old and a bit corroded. The information given by many of the vendors has me a bit confused!
>>>>
>>>>  From the Porsche PET the starter motor on my GTS is rated at 1.5kW. Even if this is based on a 10V DC supply  (I understand the battery can drop to this when cranking the engine) then the current would be 150 Amps.
>>>>
>>>> The recommended Porsche battery for my 928 has a CCA rating of 340 Amps.
>>>>
>>>> But, most of the vendors stipulate that for an engine over 3.5 litres you need jump leads that are rated at anything from 500 to 700 Amps! This is obviously way more than the starter motor draws and considerably more than the battery can deliver.
>>>>
>>>> Is there a flaw in my logic somewhere?
>>>>
>>>> What would you guys recommend?
>>>>
>>>> Cheers,
>>>>
>>>> George.
>>>>
>>>>
>>>
>>