[DeTomaso] Re Re: ZF on eBay ??
Dave Londry
davel at trguys.com
Fri Mar 23 11:34:38 EDT 2018
Makes sense!
This was about squeezing the last bit out of a race car, so some
complexity is one of the tradeoffs.
On 23/03/2018 4:18 AM, Sean Korb wrote:
> 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/
>
>
>
> _______________________________________________
>
>
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
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-------------- next part --------------
Makes sense!
This was about squeezing the last bit out of a race car, so some
complexity is one of the tradeoffs.
On 23/03/2018 4:18 AM, Sean Korb wrote:
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][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]<[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]5]spkorb at spkorb.org [6][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. [7]http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=au
to_pres
2. [8]mailto:davel at trguys.com
3. [9]mailto:DeTomaso at server.detomasolist.com
4. [10]http://server.detomasolist.com/mailman/listinfo/detomaso
5. [11]mailto:spkorb at spkorb.org
6. [12]http://www.spkorb.org/
_______________________________________________
Detomaso Email List is not managed by POCA
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nks above.
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osted here to all past, current, or future members of the list. They also grant
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t messages.
References
1. http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context
2. mailto:[2]davel at trguys.com
3. mailto:3]DeTomaso at server.detomasolist.com
4. http://server.detomasolist.com/mailman/listinfo/detomaso
5. mailto:5]spkorb at spkorb.org
6. http://www.spkorb.org/
7. http://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=1011&context=auto_pres
8. mailto:davel at trguys.com
9. mailto:DeTomaso at server.detomasolist.com
10. http://server.detomasolist.com/mailman/listinfo/detomaso
11. mailto:spkorb at spkorb.org
12. http://www.spkorb.org/
13. mailto:DeTomaso at server.detomasolist.com
14. http://server.detomasolist.com/mailman/listinfo/detomaso
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