Whp vs. Engine hp?

Pelican170

Ok, just curious about if there is any real conversion to tell what the engine hp is when knowing the whp? Here is my logic but im sure its not accurate. For example, when comparing the sport vs nismo, we see there is a 19 engine hp difference. From what ive read, there is approx a 5 whp difference (19 bhp) between the two cars (this is not a nismo vs sport thread or anything of the sort, so please dont bring it to that level. If my info is wrong, i appologize). So my logic tells me the whp to engine hp is 3.8 =(19/5). So for add on parts that get dyno'd, can you simply take the dyno whp and multiply it by 3.8 to get the bhp? Make sense? Lol, im sure thats not accurate but very curious...

Kingbaby

I don't think that math is correct.

I think MT cars take a 17%+/- drivetrain loss

so a 100hp car = 78whp give or take

something like that, cause using your math of whpx3.8=CRAZY

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spearfish25

With your 3.8 factor, people who dyno 300 whp would be making about 1100hp at the crank.

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leighspped

i like those numbers

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Pelican170

Haha good point above. Didnt think about that lol. Stupid me... Wonder if there is a conversion just cuz when i get parts on, id like to be able to say i have about x amount of hp...

shadoquad

I test it the old fashioned way. I line up at the drag strip next to a sled with X horses tied to it and the same weight in the sled. I haven't reached the point of testing whether we really get 330 horsepower, because I only got as far as 30 before running out of space for all the horses, and quite frankly, I'm tired of cleaning up the poops.

Pelican170

Lol

dixon cider

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m4a1mustang

Converting from whp to bhp always involves some fuzzy math, but we can assume on a Dynojet the average 370 loses about 17% of its power through the driveline in stock form.

But this number can change from day to day and especially dyno to dyno.

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UNKNOWN_370

If 17% is the magic number? That means the Z is overrated. Crank to wheels its supposed be 15%. I'm guessing the british 326hp at the crank is the right number???

Very interesting. The genesis coupe 3.8, is underrated by 20hp. It runs 306 but runs about 280hp at the wheels. We run 326 at the crank as well. Crazy how much faster we are considering realistically, we are running the same exact power.

Red__Zed

The Z has a very inefficient drivetrain, hence higher loss.

PapoZalsa

Also depends if is RWD or FWD car for the loss in WHP...

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Pelican170

I just meant for our cars. Haha when can we say we have a 400hp car? Lol

Pelican170

My main thing is if a nismo only has an exhaust and slight tune to give it a bhp of 19 more, how much bhp do hfc's and an exhaust add, ya know??