What is whp? please i know it stupid question but i dont get it

[mickey]

i know it stand for "wheel horsepower" but i dont get it. can someone explain it to me because it making me confuse between hp and whp. it would be help a lot of u help me get my mind straight and clear.

 

[davidalindsey]

well HP is the horsepower that the engine puts out at the flywheel without a transmission or axle, WHP is horsepower that makes it to the drive wheels, WHP is always going to be lower, if you gain on one you'll gain ont he other but the WHP is what really matters, you lose HP through the drivetrain so thats why WHP is always a little less and you lose a little more through an auto than with a manual

so to answer your question, WHP is what counts so thats what you want to gain but if you gain on one the other will gain to

 

[AG 305]

simple really. when you say HP it usually means the amount of horses the motor itself is making. not always is the amount of hp actually being put down to the ground.

WHP would mean actual power to the wheels. for example, you can have a car with 100hp but only 50 of it is actually being put down to the ground.

you want some good WHP numbers

 

[mickey]

well HP is the horsepower that the engine puts out at the flywheel without a transmission or axle, WHP is horsepower that makes it to the drive wheels, WHP is always going to be lower, if you gain on one you'll gain ont he other but the WHP is what really matters, you lose HP through the drivetrain so thats why WHP is always a little less and you lose a little more through an auto than with a manual

so to answer your question, WHP is what counts so thats what you want to gain but if you gain on one the other will gain to

so u telling me hp is tell me how powerful or fast just alone engine without tranny. whp is just tranny and axle. correct me if im wrong?.

 

[96awd]

You're making this more difficult than it is..

WHP = wheel horsepower. Meaning how much power your wheels are putting to the ground. All that power is going through your trans, to your axles, to your wheels, to the ground. As you said, sort of.

Simple as that. /thread.

 

[mickey]

simple really. when you say HP it usually means the amount of horses the motor itself is making. not always is the amount of hp actually being put down to the ground.

WHP would mean actual power to the wheels. for example, you can have a car with 100hp but only 50 of it is actually being put down to the ground.

you want some good WHP numbers

hmmm i want to make sure i understand. if i got 200 hp. my whp is 100? does it take half or depend?

 

[mickey]

You're making this more difficult than it is..

WHP = wheel horsepower. Meaning how much power your wheels are putting to the ground. All that power is going through your trans, to your axles, to your wheels, to the ground. As you said, sort of.

Simple as that. /thread.

oh i get it but what kind of parts to add whp? can whp be more than hp?

 

[AG 305]

hmmm i want to make sure i understand. if i got 200 hp. my whp is 100? does it take half or depend?

oh no no not at all that was just an example

 

[96awd]

hmmm i want to make sure i understand. if i got 200 hp. my whp is 100? does it take half or depend?

No, FWD is something like 13% drivetrain loss. I'll let a wiseman come in and fix that if it's wrong. AWD is in the 30 percentile range, I believe.

 

[Calan]

Your engine makes some amount of HP at the flywheel... your drivetrain has x amount of power loss due to friction, usually represented as a percentage.

wheel horsepower = flywheel horsepower * (1 - drivetrain loss %).

So if you are making 250hp at the flywheel, and you have 20% drivetrain loss, your WHP is:


Wheel horsepower = 250 * (1 - 20%)
= 250 * .8
= 200 awhp


There are no set rules to determine how much drivetrain loss any one car has, although that doesn't stop people from making educated guesses about it. There are just WAY too many factors involved...which is the main reason that people don't discuss flywheel horsepower very often. Measure it at the wheels, and it is what it is.

 

[TSi Kid]

hmmm i want to make sure i understand. if i got 200 hp. my whp is 100? does it take half or depend?

That seems still too high being that you own a dodge neon. You may be in the 80-90whp range but even then that's only if you're double clutching instead of granny shifting.

 

[mickey]

Your engine makes some amount of HP at the flywheel... your drivetrain has x amount of loss due to friction.

wheel horsepower = flywheel horsepower - drivetrain losses.

There is no set rule as to how much drivetrain loss your car has, although that doesn't stop people from making educated guesses about it. There are just WAY too many factors involved...which is the main reason that people don't discuss flywheel horsepower very often. Measure it at the wheels, and it is what it is.

huh?!. i mean why u say drivetrain loss? i mean all u got to do is put better parts for whp and add whp.

That seems still too high being that you own a dodge neon. You may be in the 80-90whp range but even then that's only if you're double clutching instead of granny shifting.

hp is always more than whp or whp is always more than hp? i mean why people always talk about whp more than hp?

 

[davidalindsey]

Well you know engine horsepower (Gross Horsepower) is measured directly from its source, the flywheel. The flywheel alone puts no load on the engine. And as a result of the engine having no load on it all of the energy it produces is used for making horsepower.
Wheel Horsepower (Net Horsepower) on the other hand is measured at the wheels, obviously. The frictional loss between the engine and front and rear wheels will always cause the engine HP to be higher then Wheel HP. There are many factors that affect the whp such as the weight of the car, the transmission, the driveshaft, rear-differential, and four axle shafts.

 

[Calan]

huh?!. i mean why u say drivetrain loss? i mean all u got to do is put better parts for whp and add whp.



hp is always more than whp or whp is always more than hp? i mean why people always talk about whp more than hp?

Did you read my post?

 

[TSi Kid]

huh?!. i mean why u say drivetrain loss? i mean all u got to do is put better parts for whp and add whp.

Serious time, drivetrain loss is like friction.

With just horse power, it's like sliding a hockey puck across a palate of ice.

With WHEEL horse power, it takes into account how life isn't a perfect system and energy is lost through your drive train parts; like sliding a hockey puck across your hardwood floors.

 

[96awd]

huh?!. i mean why u say drivetrain loss? i mean all u got to do is put better parts for whp and add whp.



hp is always more than whp or whp is always more than hp? i mean why people always talk about whp more than hp?

Please, stop. Just stop. That's not "all u gotta do."

Because nobody cares how much power your motor is making itself! They want to know how much wheel horsepower your car has, as if it was put on a dyno.

Again, please stop posting.

 

[mickey]

Serious time, drivetrain loss is like friction.

With just horse power, it's like sliding a hockey puck across a palate of ice.

With WHEEL horse power, it takes into account how life isn't a perfect system and energy is lost through your drive train parts; like sliding a hockey puck across your hardwood floors.

ooh i get it, great example

Did you read my post?

it help hehe. thank you

 

[TSi Kid]

Thank you sir, I work hard to benefit this community. That and I do it for teh lulz.

 

[H4G64T]

420A makes 140 to the crank stock, with an average drivetrain loss of 15% you are putting down around 119.

Now to really /thread this.

Next time you want to know what you are making, go to a dyno.

 

[mickey]

420A makes 140 to the crank stock, with an average drivetrain loss of 15% you are putting down around 119.

Now to really /thread this.

Next time you want to know what you are making, go to a dyno.

how much i got to pay for dyno? just guess

 

[96awd]

how much i got to pay for dyno? just guess

Really? That depends on the shops going rate for a dyno run or 3. Call around to shop with a FWD/RWD dyno.

 

[mickey]

Really? That depends on the shops going rate for a dyno run or 3. Call around to shop with a FWD/RWD dyno.

i have no idea how much it cost. i dont know if it expensive. just guess how much u know of?

 

[96awd]

You have to call shops around your area that may have a dyno in their shop. I can't give you a price!


That's seriously as plain as I can get. If you're lucky, and the shops around you have a dyno day, maybe 30 bucks a pull. That's my guess. Now call around and get an ACCURATE price.

 

[gusu]

Most shops charge 65-150 for three pulls on a awd dyno. I have never checked fwd/rwd dyno rates. The other factor is what else they are doing. Such as dyno tuning or dynoing with AF monitoring.

 

[Fotowntalon]

420A makes 140 to the crank stock, with an average drivetrain loss of 15% you are putting down around 119.

You forgot to take into account 15 years of wear and tear, so he is putting down less than that. (I know now I really confused the hell out of him) but I sense he is a troll anyways.