2005 4.0 Mustang: What is the real HP? - Ford Mustang Forum
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post #1 of 27 (permalink) Old 05-19-2007 Thread Starter
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Question 2005 4.0 Mustang: What is the real HP?

I have a 05 with the 4.0 ford rates this motor at (210 hp) I dont think so has anyone put theres on a dyno?
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post #2 of 27 (permalink) Old 05-19-2007
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You think it's more or less than advertised??

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post #3 of 27 (permalink) Old 05-20-2007
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Quote:
Originally Posted by 05 ponyguy View Post
I have a 05 with the 4.0 ford rates this motor at (210 hp) I dont think so has anyone put theres on a dyno?
The 210 HP is at the crank... eveyone here uses a chassis dyno which measure the HP at the wheel (what get's to the ground) not the crank... This is label RWHP (rear wheel HP).

Now if you look at an automatic you need to figure 18% to 20% power loss between the crank and the wheels... so

210HP - 20% = 168 RWHP

Take a look at this dyno sheet... it shows a stock V6 automatic.. (it's the RED one)

http://www.alternativeauto.com/image...ng_v6_dyno.jpg

167.9 RWHP which is about right.. this is a brand new car so the HP might be down a couple... the 4.0L doesn't loosen up until about 10,000 miles... LOL

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post #4 of 27 (permalink) Old 05-20-2007
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horsepower

http://www.dragtimes.com/Ford-Mustan...lip-10363.html

This should help you out this is an automatic.
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post #5 of 27 (permalink) Old 05-20-2007
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RE: Stock HP

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Originally Posted by illegalstealth View Post
http://www.dragtimes.com/Ford-Mustan...lip-10363.html

This should help you out this is an automatic.
According to that info (180HP), the loss is only 14.3%.

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post #6 of 27 (permalink) Old 05-20-2007
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Quote:
Originally Posted by zenflow View Post
According to that info (180HP), the loss is only 14.3%.
That sounds about right... General rule of thumb is 12% drivetrain loss with a stick and ~15% with an auto.

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post #7 of 27 (permalink) Old 05-20-2007
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Most people like us on this forum realize the difference between crank HP and RWHP. But I think car companies should start specifying the HP as either specifically crank or RWHP. Just putting up a number and not specifying that it is crank is kind of misleading for the average joe/jane with little car knowlege. Me personally, I want to know RWHP as most people would.

"Their are two types of pedestrians: The quick and the dead"
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post #8 of 27 (permalink) Old 05-20-2007
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Quote:
Originally Posted by zenflow View Post
Most people like us on this forum realize the difference between crank HP and RWHP. But I think car companies should start specifying the HP as either specifically crank or RWHP. Just putting up a number and not specifying that it is crank is kind of misleading for the average joe/jane with little car knowlege. Me personally, I want to know RWHP as most people would.
It's all marketing... Ford is going to be able to sell more GTs if it can say 300 hp vs 268.

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post #9 of 27 (permalink) Old 05-20-2007
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I believe most automakers will quote power as hp (SAE), which measures at the flywheel.

http://en.wikipedia.org/wiki/Horsepower#hp_.28SAE.29
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Anyone have a dyno sheet of a stock 4.0L manual? Is the difference really that big between stick and automatic?

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post #11 of 27 (permalink) Old 05-21-2007 Thread Starter
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hp for my 4.0

thank you. I thought it was less at the rear wheel i just did not know how much.
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RE: big difference??

Quote:
Originally Posted by Black05Pony View Post
Anyone have a dyno sheet of a stock 4.0L manual? Is the difference really that big between stick and automatic?
Based on what stlwagon said "general rule of thumb 12%loss for stick and 15% for auto"....I guess 3% difference between the two isn't really that big for the consistency and convenience of an auto. A lot depends on the tune as well. Take for instance if you put an auto with an aftermarket tune against a manual with a stock tune.

"Their are two types of pedestrians: The quick and the dead"
-unknown
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Ah... HP is just a number. If with my butt, I can feel the car pulling hard and going fast... that is all that matters!

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True

True...True. The higher gas prices get, the lower my interest in HP gets.

"Their are two types of pedestrians: The quick and the dead"
-unknown
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05 Satin Silver V6/Automatic/NO Traction Control NO anti-lock brakes (can't stand either one)/TI CAI w/ SCT Xcal2 93 Octane Bamachips Torque Tune/Pypes true dual w/x-pipe and Violator mufflers/Alpine Head Unit w/ iPod jack/XM Delphi SKYFi2/Alpine rear deck speakers/Molded splash guards/Steeda Dead Pedal/GT takeoff front and rear sway bars.
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Quote:
Originally Posted by wally05 View Post
Ah... HP is just a number. If with my butt, I can feel the car pulling hard and going fast... that is all that matters!
True. The only "accurate" dyno is the butt-dyno.

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