Re: [Chrysler300] dyno

[Edward Mills Antique Tractors <millserat@xxxxxxxxxxxxx>]

No constant answer - parasitic losses will include alternator, air cond, 
power steering, fan, and any other accessories. And it will make a 
difference if there is a lot vs minimal electrical draw on alternator 
and whether fan clutch is in good shape etc. Then figure efficiency 
loses in transmission and rear end. 15% may be ballpark loses, but I 
suspect it may be a bit high at the HP range you are at or a bit low on 
a 100 HP engine. Back in the 70's when they went to Net HP instead of 
previous Gross HP, we did a 240Z which was140 or there abouts Gross 
rated HP but in the 80-90 HP range Net on a chassis dyno. You could pick 
up about 10% by opening up exhaust and another 4 to 5% by losing Air 
Cleaner element, but it was difficult to get over 100 HP with alternator 
and fan plus transmission losses. I would kind of guess the losses are 
more nearly a constant 40-50 HP rather than a %. but best to run engine 
alone on dyno before installing in car if you really want to know.

Dave Schwandt wrote:
>  
>
> Figure losing 15% in the drivetrain, at least that's what they figure 
> on a
> big truck.
>
> That makes it approximatley 490 HP
>
> Dave Schwandt
> ----- Original Message -----
> From: "bluesport62" <LUCKYL46@xxxxxxx <mailto:LUCKYL46%40aol.com>>
> To: <Chrysler300@xxxxxxxxxxxxxxx <mailto:Chrysler300%40yahoogroups.com>>
> Sent: Wednesday, September 30, 2009 8:02 PM
> Subject: [Chrysler300] dyno
>
> > HI GANG. MAYBE SOMEONE CAN ANSWER THIS QUESTION. IF A DYNO READS 
> 417HP AT
> > THE REAR WHEELS WHAT IS THE HORSE POWER AT THE FLYWHEEL? THANKS JOE
> > QUEENS NY
> >
> >
> >
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> 




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