Good Sam Club Open Roads Forum: Tow Vehicles: Rated engine power
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MFL

Midwest

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Joined: 11/28/2012

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Posted: 11/17/19 08:52am Link  |  Quote  |  Print  |  Notify Moderator

Super_Dave wrote:

I've been bothered by HP ratings being at essentially redline RPM or in a range that I would never ever be driving at. I would want to know max HP at my user range.


This confuses some into thinking their late model V6 minivan, or suv, with say 290 rated hp, is as capable as some older V8s they have owned. Problem is, that hp is achieved at 6500 rpm, which no one would tow at, continuously.

Jerry





rjstractor

Maple Valley, WA

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Posted: 11/17/19 09:22am Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

^^^I find that interesting. Do these apps ask for the vehicle weight then time how long it takes for the vehicle to coast in neutral as well as time how long it takes to accelerate?


I'm not sure. I imagine it's a lot more sophisticated than that, using the phone's accelerometer and GPS, as well as data received from the vehicle's OBD2 port. Vehicle weight is part of setup I would think.

4x4ord

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Posted: 11/17/19 09:13pm Link  |  Quote  |  Print  |  Notify Moderator

rjstractor wrote:

4x4ord wrote:

^^^I find that interesting. Do these apps ask for the vehicle weight then time how long it takes for the vehicle to coast in neutral as well as time how long it takes to accelerate?


I'm not sure. I imagine it's a lot more sophisticated than that, using the phone's accelerometer and GPS, as well as data received from the vehicle's OBD2 port. Vehicle weight is part of setup I would think.


I think you're right it probably uses weight and acceleration along with a generic coefficient of drag to determine hp. Unless it involves coasting in nuetral on level ground it is just kind of a best guess. I wonder if these apps you are talking about will draw a torque curve and brake specific fuel consumption map?


2017 F350 SRW Platinum short box 4x4.
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2008 Citation Platinum XL 34.5

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