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Thread: AWD WHP vs 2WD WHP??????

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Posts: 41-48 of 48
2009-11-20 17:22:22
Just bustin peoples balls. This thread reminds me. I need to go get the b15 weighed. That would be a nice addition to people's sigs.
2009-11-20 19:49:21
If you want to put things in your signature, the most often used stat (and thus most easily recognizable and comparable) is horsepower per tonne or HP/tonne. (That's a "metric ton" not a US ton, so 2,204.6 lbs. or 1,000 kg)

This is how Caterhams are named actually. They are called the CSR 260, R300, R400 and R500 having 260, 300, 400 and 500 HP per tonne respectively. The car weighs approx. 1,100 lbs. (500 kg or 1/2 ton) and for example the CSR 260 has 130 HP. At the other end of the spectrum the R500 has 250 HP.

130/0.5 = 260 HP/tonne

250/0.5 = 500 HP/tonne

Pounds per HP or HP per pound is much less commonly used.

Mine weighed 2,492 lbs. at the convention (1.13 tonnes) and has 303 WHP so that gives me 303/1.13 ≈ 268 WHP/tonne. I don't usually like to do this, but you'll probably want to convert from WHP to HP if you want to compare to OEM vehicles.

303 * 1.15 ≈ 348 HP

348/1.13 ≈ 308 HP/tonne for my car.

That's comparable to a Caterham R300 (sort of) for whatever that's worth.

For a long time 500 HP/tonne was the holy grail of performance cars after WWII. Some time in the change of the century with the power wars going on, someone got the crazy idea to make a car with 1,000 HP/tonne. That car is the Caparo T1 and re-wrote the book on performance cars with 1,045 HP/tonne.
For reference the Ariel Atom weighs 456 kg (1,005 lbs.) so similar the Caterham, about 250 HP gets you to the old pinnacle of 500 HP/tonne. The upcoming 500 HP Atom should put it slightly past the Caparo T1 at 1,096 HP/tonne.

The DP1 is 375 HP and 850 lbs. (385.5 kg) so 973 HP/tonne.
2009-11-22 19:11:50
Originally Posted by mirrortints
This is more of what I was expecting from this thread. A layout of the avg losses, then comparing weight.

Why did it take so many posts to get here?

funny...i still didnt really get where i was trying to go with my original question. i try my best to explain in detail what kind of info im looking to get or that im giving, but apparently i was not detailed enough.
2009-11-22 19:13:07
correction: the answer probably lies within this thread somewhere. im honestly just not willing today to decode all the mathmatical jargin!
2009-11-28 20:27:49
Like Ben said, these are all rough estimates. Too many variables to have a simple formula dedicated to calculating the exact WHP #.
2009-11-28 20:32:43
Disconnect Driveshaft Then Dyno.. For An Awesome Comparrison
2009-11-29 15:58:03
Originally Posted by nismo94tuner
Honestly my buddy had a 35r kit on his STi. The car made 430whp on not sure what boost level. Definately had more in it but it was a conservative street tune. I won't get into details but lets just say a T25 sentra on high boost was hurtings feelings. Something about those subarus I don't get. I have yet to see one that is holy **** fast. Evos on the other hand, I have seen a **** load of scary fast evo's. I'll report back when I take a ride in my other friends 35r wrx that just made 511whp.

ha. i hear ya bes. ive ran alot of subbies in my day, and i have only lost to 1. ive raced some with alot more whp then me and still showed them was up.

to the op dont fear his car at all, a 300whp subbie is not fast at all.

2009-11-29 23:07:04
Originally Posted by STRATTON

to the op dont fear his car at all, a 300whp subbie is not fast at all.


nope. haha. i was in it today on his 20psi map. quicker than his 18psi map ofcourse, but still doesnt snap my neack like my sub 300whp b13.... and thats with my outragous wheelspin!!! LOL
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