Does anybody know what BHP @ the flywheel my S2 will be? It got 156 ATW

Thanks

Chris

 

184bhp ish at flywheel if thats the bhp at wheels.

 

Thats about cock on mate, mine is 155 @ the wheels and i think 180 at the fly.

 

In fact here you go mate.

 

 

What would mine be at the wheels. its 191.8 at the fly?

 

yeah the rule of thumb is around 30 is lost through the drive so if yours is 191 then approx say its 160 ish. cant wait to get mine re-mapped and rollered a week on saturday and see what power i get. Should be over 250 all being well!!!

 

Does that rule of thumb work for all engine and drive, so would a 600bhp cossie lump be 570bhp at the wheels?
How about monsters like vayrons?

 

no i was talking in regards to front wheel escort turbos, sorry i wasn't clear, i worked this rough estimate out from seeing mine on rollers a few times. fwd escort turbos seem to lose about 30 hp through the drive.

 

I see dude, cheers, its the a general rule of thumb for most cars?

 

yours is a nice looking car though mate, like the wheels, weren't sure wether to do that with mine.

 

who cares mate its your wheel power and power to weight that matters

 

Oks next Q then, for working out power to weight, do you use fly power or wheel power?
oh am I right is a rst 965kgs?

 

Really you should use wheel bhp, but every one will just use crank.... i think the rst is actually 940KG but could be wrong.

Just take your power and divide it by 0.94,

trans losses are normally given as a percentage so they are correct throughout. My car has 155 brake @ the wheels and 186 @ the crank.

Trans losses are 155/186 X 100 giving 83% so trans losses are roughly 17% things like wheels and tyre pressure can influence this quite a bit too. But as Herbo said, using the above percentage gives a loss of 31.62 bhp so pretty damn close.

Crazycage is right mate, its all about brake per ton and powers given at the wheels, crank powers can be so easily fudged.

Rob,

 

Yeah having seen mine on rollers at jamsport a few times i just seen 30hp is lost. just a rough guide nothing more. but its like cage says, its about how it goes!!! is that how much escort turbos weigh??? thought they weighed over a tonne slightly in standard form?

 

oks so I think I've got this right, my fly power is 191.8, -17% = 159.2 at the wheels.
then 159.2 divided by 0.94 = 169.4 bhp per ton.

 

Ta bud! the only thing with the back wheels is it dont take long before the look gray with brake dust!

 

Ye thats right @ the wheels, however most people give figures from the fly in the UK. Should go well mate.

 

Wicked dude! she does go well, when its on the road, lol

 

I know the feeling! I've forgotten what mines like to drive completely! forgot good enough to carry on spending money on it any way lol

Good luck mate

Rob,

 

A girl I know took me out in her FesRst(not on here) for a blast and some non car fun, and the best bit of the night was getting to drive a cvh turbo after 8weeks, only cos it was very cold out!lol

 

joker lol..... good girl tho! (for having a frst..... and for the rest)

 

was a very good girl! even if we were being super bad!

 

Why super bad mate, did she borrow the car from her fella

 

I dont need a response to that btw lol

 

I wont lol
Cheers for the useful hepl on the power front

 

If its around a 30bhp loss through trans then that makes mine about 180 at the wheels, wouldnt know how much mine weighs though

 

general estimate is a 15% power loss through transmission.
so 100bhp at the fly would be about 85bhp at the wheels.
200bhp at the flywheel would be about 170bhp at the wheels
so on an so forth.
this is for a fwd vehicle, rwd is a bit more and 4wd is more loss again.

 

Would you not be able you use the weight of a normal combi van?

 

Mine isnt a combi van though,its a 2 door estate with panels fitted instead of glass,from looking in the manual though it says that a 1.6 3 door estate comes in at 965kg