Power Figures

nissanman · Post by **nissanman** » Sun Jul 22, 2007 11:47 am

^ What boost is that on Brian?
Yea it is good to see the engine progress. Especially if you do your own work.
I dynoed mine stock and pulled 129rwkw, put in some time myself and got it up to the 173rwkw... feels good

Under 1000kg's....... thats a yummy power to weight ratio

Pistonfreak · Post by **Pistonfreak** » Sun Jul 22, 2007 3:23 pm

217hp was on 17psi

222hp was on 14.5psi

Ozchuck · Post by **Ozchuck** » Mon Jul 23, 2007 2:56 am

I dont know how the S14 weighs under a tonne through?
Given they're heavier than an S13, which is a challenge to get to that weight itself?

Unless you mean brians car?

nissanman · Post by **nissanman** » Mon Jul 23, 2007 9:47 am

Ozchuck wrote:I dont know how the S14 weighs under a tonne through?
Given they're heavier than an S13, which is a challenge to get to that weight itself?

Unless you mean brians car?

I wish my car weightd 1000kg with 170rwkw

Yea i meant Brians S12.
S13s are only 30-40kgs lighter.

I weighed my S14, got 1250kg taking my weight out of it. From factory they qoute from 1240-1320kg. With 173rwkw that makes it have a WHEEL-power-to-weight ratio of 7.22.
Brains S12 would be around the 6.0 Wheel KW Power-to-weight ratio (based on 1000kg and 163rwkw 222hp) Notbad...

Pistonfreak · Post by **Pistonfreak** » Mon Jul 23, 2007 11:24 pm

Interesting stuff
I have no idea how to work out the power to wight ratio?

But hellz yeah 6.0 sounds good to me

nissanman · Post by **nissanman** » Tue Jul 24, 2007 9:49 am

Its actaully very simple to equate the kw or hp power to wieght ratio. I just do them in WHEEL kw power to weight as, Kw's are used mostly these days and wheel power you can get pretty accuratly instead of working out a engine power from percentages from a dyno readout.

For example- A Nissan Micra with 200fwkw that weights 2000kgs = 10.0 wheelkw pwrtoweight.
Just divide the amount of mass you have by the power and you get your figuere.
My old S12, 120rwkw 1050kg... 1050/120= 8.75

This equation dusnt mean your car is going to be fast, but gives a pretty good indication of its capabilities.
Another good mathematical 'thingo' lol i like to use is horespower per Litres.
Work out a engine power (in hp) then divide it by ur literidge...
for example- SR20DET 1998cc 290hp/1.998=145hp per litre

Ozchuck · Post by **Ozchuck** » Tue Jul 24, 2007 1:22 pm

yeah but HP per litre doesnt really work anything out, as theres lots of other things engines are designed for than just going fast.

If you want to work out how an engine ranks engineering wise, you would normally go with horsepower/weight of engine, as the tricky bit is making more power with the same displacement using the same ammount or less steel/alloy to hold it together.
When you remember you've gotta account for how many miles the engine can go before finally going boom, which is not quite so far for an SR making 290HP

OUTATIME · Post by **OUTATIME** » Wed Jul 25, 2007 9:57 pm

250hp @ 9psi
1340kg car with the aerodynamics of a brick
whats that in powe 2 weight ratio thingo? lol

gadget1382 · Post by **gadget1382** » Wed Jul 25, 2007 11:03 pm

5.36kg/kW

OUTATIME · Post by **OUTATIME** » Thu Jul 26, 2007 3:07 pm

chars...