[DeTomaso] Re Re: ZF on eBay ??

[Sean Korb]

The alternator might need an upgrade for that kind of sustained RPM with
underdrive pulleys but Honda and... frankly all the other automakers solved
this in the '90s in an effort to increase gas mileage.  Here is a
whitepaper on the principal and practice.

http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=auto_pres

It charges the car when the battery is in fact drained but moves back down
to 12v during operation when the battery has a full charge and decreases
the field strength of the alternator.

It's... tough to diagnose a car like this if it is malfunctioning and you
are used to getting the voltmeter out and having more direct diagnostics
but it's still not bad when it is understood.  I pulled the last of my hair
out last time though.

sean


On Thu, Mar 22, 2018 at 2:24 PM, Dave Londry <davel at trguys.com> wrote:

> I remain troubled by the friction and windage losses of an alternator
> turning 10,000 rpm, when it could be turning 2500 rpm. Red-line operation
> is not good operation..
>
> If you needed (for instance) a 25A average output to keep the battery from
> cashing out before the end of the race,
> then the most efficient way to provide that should be to run the
> alternator at the minimum required rpm
> to produce 25A and at as near constant speed as possible.
> It would not be to run it under the most variable conditions and having
> already given up the parasitic drive losses.
>
> If you wanted to be most effective, do all that plus suspend charging when
> the pedal is down (play hybrid).
> Dave
>
>
> On 22/03/2018 6:10 AM, Tomas Gunnarsson wrote:
>
>> Actually, the alternator is typically geared to turn at up to around 10
>> 000 rpm at engine redline.
>>
>> Tomas
>>
>
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65 Suprang,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso
-------------- next part --------------
   The alternator might need an upgrade for that kind of sustained RPM
   with underdrive pulleys but Honda and... frankly all the other
   automakers solved this in the '90s in an effort to increase gas
   mileage.A  Here is a whitepaper on the principal and practice.
   [1]http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context
   =auto_pres
   It charges the car when the battery is in fact drained but moves back
   down to 12v during operation when the battery has a full charge and
   decreases the field strength of the alternator.
   It's... tough to diagnose a car like this if it is malfunctioning and
   you are used to getting the voltmeter out and having more direct
   diagnostics but it's still not bad when it is understood.A  I pulled
   the last of my hair out last time though.
   sean

   On Thu, Mar 22, 2018 at 2:24 PM, Dave Londry <[2]davel at trguys.com>
   wrote:

     I remain troubled by the friction and windage losses of an
     alternator turning 10,000 rpm, when it could be turning 2500 rpm.
     Red-line operation is not good operation..
     If you needed (for instance) a 25A average output to keep the
     battery from cashing out before the end of the race,
     then the most efficient way to provide that should be to run the
     alternator at the minimum required rpm
     to produce 25A and at as near constant speed as possible.
     It would not be to run it under the most variable conditions and
     having already given up the parasitic drive losses.
     If you wanted to be most effective, do all that plus suspend
     charging when the pedal is down (play hybrid).
     Dave
     On 22/03/2018 6:10 AM, Tomas Gunnarsson wrote:

     Actually, the alternator is typically geared to turn at up to around
     10 000 rpm at engine redline.
     Tomas

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   --
   Sean Korb [5]spkorb at spkorb.org [6]http://www.spkorb.org
   '65 Suprang,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
   "The more you drive, the less intelligent you get" --Miller
   "Computers are useless.A  They can only give you answers." -P. Picasso

References

   1. http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=auto_pres
   2. mailto:davel at trguys.com
   3. mailto:DeTomaso at server.detomasolist.com
   4. http://server.detomasolist.com/mailman/listinfo/detomaso
   5. mailto:spkorb at spkorb.org
   6. http://www.spkorb.org/