How do you calculate bhp per ton

[Ben P]

Just wondered if for example I had 120bhp and a kerb weight of 950kg what would the formula be for calculating the bhp per ton?

Cheers

 

[Nick Read]

Assuming were measuring metric tonnes rather than imperial tons (which most people do) you divide bhp by weight in tonnes.

ie 120/0.95= 126.3 bhp/ton

In fact the unit of measurement itself tells you what calculation you need to do...eg mph is distance in miles divided by time in hours.

 

[technicalman]

mmmm, dont make cars like that anymore, its not allowed, sounds like a 1.6 Gti 205.......

 

[Ben P]

Cheers Nick, thats what I thought but I was getting stats from a website and it wasnt quite adding up

The example I was using was supposidly a 106 gti

Stats given (could be wrong) 120 bhp, 950 kg, 128 bhp per ton

 

[RSTDL]

My Cup = 946Kg

1000/946x172 = 181.8 BHP/Tonne approx (withoout petrol)

 

[SteveJJH]

1.6 gti 205s are about 135bhp/tonne

115 bhp 850kgs

 

[black-cat]

It could be a saxo, kerb weight is about 937kg if I remember right.

 

[Pugboy]

cupsize:

your car would be zero BHP/Tonne without petrol!

0/946 = 0

 

[Pugboy]

sorry, i meant 0/0.946

 

[RSTDL]

Hows that Pugboy? Just coz it aint moving doesnt mean it doesnt have a ratio !? The ratio with petrol goes down due to the added weight!

 

[Pugboy]

take the petrol out and see how fast your car is!

 

[RSTDL]

Its theoretical mate - cars in showrooms have none or little petrol they still have a BHP/Tonne ratio in the spec - maybe it should read for the increibly dumb (please add petrol) after the ratio - eh? I have a funny feeling you know what I mean though

add 43kg of petrol then and the ratio becomes

946kg + 43kg = 989kg

1000/989x172 (180) in my case = 182 BHP/tonne !!!!!!!!!!!!! Like I said!