Rwhp vs. bhp

[Gman5001]

Im still new to sports cars and performance so could someone please explain the difference between RWHP vs BHP I know what they stand for I just don't understand why they are different. Please help

[Tayap79]

BHP is basically what HP the engine produces if it were say, tested in a lab. No accessories hooked up to it, no transmission, none of that. The RWHP is the HP that is seen at the wheels and what is put to the ground. It is lower than BHP due to the losses from the transmission, various pumps on the car, friction etc.

Get it?

[Gman5001]

Yea so when they say my car makes 323 (I think) it really doesn't?

[Tayap79]

I'm assuming you have the V6? The engine would make 323 on a dyno, so technically, yes it does make that much. Does that much HP make it to the road? No.

For instance my 2SS A6....rated at 400 HP, I'm only seeing proably around 320ish to the ground. Automatic transmissions have a bigger loss than the manuals do.

All this is easily displaced with a few bolt ons though!

[Gman5001]

Originally Posted by Tayap79

I'm assuming you have the V6? The engine would make 323 on a dyno, so technically, yes it does make that much. Does that much HP make it to the road? No.

For instance my 2SS A6....rated at 400 HP, I'm only seeing proably around 320ish to the ground. Automatic transmissions have a bigger loss than the manuals do.

All this is easily displaced with a few bolt ons though!

Yea I have a v6, so why do autos lose more and also why does it lose the power anyways.

[ChibiBlackSheep]

http://autospace.co/did-you-know-wha...hp-bhp-ps-whp/

[Gman5001]

Originally Posted by ChibiBlackSheep

http://autospace.co/did-you-know-wha...hp-bhp-ps-whp/

Thanks that actually cleared up mostly all of my question.

[Gman5001]

Does anyone know what the RWHP of a 2012 v6 camaro is stock?

[kjkjr27]

Each is different but I want to say around 260rwhp?

[ChibiBlackSheep]

Originally Posted by Gman5001

Thanks that actually cleared up mostly all of my question.

Glad I could help

[Gman5001]

Originally Posted by kjkjr27

Each is different but I want to say around 260rwhp?

Why doesn't Chevy advertise that?? They make it seem like it is so much more.

[Tayap79]

Originally Posted by Gman5001

Why doesn't Chevy advertise that?? They make it seem like it is so much more.

Everyone does that.

[zer0ss]

Originally Posted by Gman5001

Why doesn't Chevy advertise that?? They make it seem like it is so much more.

For the same reason they tell you the sticker price instead of grand total with fees, how much interest you'll pay at your qualified rate (until you get in the dark room in the back), its sells better that way.

Also, I thought the quick math on loss to the wheels was 15% for the auto and 20% for the manual.

[JohnnyBfromPeoria]

Originally Posted by zer0ss

Also, I thought the quick math on loss to the wheels was 15% for the auto and 20% for the manual.

I believe that's a bit backward.

John B.

[KMPrenger]

Originally Posted by Gman5001

Why doesn't Chevy advertise that?? They make it seem like it is so much more.

Don't make a big deal out of it. EVERYONE advertises that way..and it is NOT false advertising. The engine does make 323 horsepower, but by the time the power makes it to the wheels, it has lost roughly 20% power because of the drivetrain.

Sure, so its only 250 or 260 at the wheels, but just think about other cars on the road. Hell, my Ford ranger with the little 3.0 V6 only makes 160 horse...so I'm probably only getting 125 or so to the wheels.

[meissen]

Originally Posted by Tayap79

I'm assuming you have the V6? The engine would make 323 on a dyno, so technically, yes it does make that much. Does that much HP make it to the road? No.

For instance my 2SS A6....rated at 400 HP, I'm only seeing proably around 320ish to the ground. Automatic transmissions have a bigger loss than the manuals do.

All this is easily displaced with a few bolt ons though!

Just to correct the slightly false information here -- The engine may put out 323 on an ENGINE dyno which is just measuring horsepower at the crank (I'm assuming engine dynos are only measuring crank horsepower). But it will NOT measure 323 on the regular dynos that everyone uses where you drive onto it and then the operator "drives" the car while the rear wheels spin two drums and then horsepower is calculated. That type of wheel dyno will get you the rear wheel horsepower which will be lower than 323.

My 2012 LFX with only a Cold Air Inductions cold air intake put down 270rwhp and (at least for now) is the "highest horsepower LFX" on the site.