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Old 06 July 2008, 00:10
Mikkel
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Was just looking at some power to weight figures for various Imprezas, which surprised me slightly.

The RB320 is around 207bhp per tonne, whilst the older WR1 is around 220bhp per tonne. Does that mean the WR1 will be quicker than the RB320?

Also, my spec D is around 205bhp per tonne running 360/390, so my car must be quite a bit heavier than both. Did they make the RB320 lighter? I thought it was just a PPP with frills?

On a different note - The FQ360 running the same power as my car has a quoted 260bhp per tonne, which is very impressive. Strangely though I have out accelerated an FQ360 before in my car, but surely it should be much quicker with that power to weight?
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Old 06 July 2008, 10:44
tony95
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other factors will come in to play,gear ratios,torque curves ,relative weight of right foot etc.
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Old 06 July 2008, 11:30
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I did my car on a power to weight calculator and mine came up with 358bhp per tonne

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Old 06 July 2008, 11:38
rooferman
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Mine comes out at 562 bhp per tonne on the car stats calculator........




But i lied about the bhp and the weight...............
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Old 06 July 2008, 11:42
bluenose172
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How can a 360bhp Spec D only have a P/W/R od 205?
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Old 06 July 2008, 11:49
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Quote:
Originally Posted by Mikkel View Post
Was just looking at some power to weight figures for various Imprezas, which surprised me slightly.

The RB320 is around 207bhp per tonne, whilst the older WR1 is around 220bhp per tonne. Does that mean the WR1 will be quicker than the RB320?

Also, my spec D is around 205bhp per tonne running 360/390, so my car must be quite a bit heavier than both. Did they make the RB320 lighter? I thought it was just a PPP with frills?

On a different note - The FQ360 running the same power as my car has a quoted 260bhp per tonne, which is very impressive. Strangely though I have out accelerated an FQ360 before in my car, but surely it should be much quicker with that power to weight?
How did you get you Bhp/tonne? Are you confusing metric and imperial ton(nes)? I think your car is around 250bhp/ton.
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Old 06 July 2008, 11:53
Mikkel
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LOL I've probably ballsed it up then!

I was looking at the graph I got from Andy F. Its says:

360BHP@5593rpm 389LbFt@4101rpm 205BHP/ton

Edit: Spec D weight is 1495kg
Last edited by Mikkel : 06 July 2008 at 11:57.
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Old 06 July 2008, 11:57
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try using this calculaotr for your car! I think yours comes out around 260bhp per tonne


Car Stats - Calculator

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Old 06 July 2008, 12:01
Mikkel
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Quote:
Originally Posted by stevebt View Post
try using this calculaotr for your car! I think yours comes out around 260bhp per tonne


Car Stats - Calculator
That calculator tells me 244.67bhp/ton

I'm only 12 stone myself and I guess Andy F is not much more, so not weighing the car down that much when he took the readings
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Old 06 July 2008, 12:07
Carl2
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Originally Posted by bluenose172 View Post
How can a 360bhp Spec D only have a P/W/R od 205?
It would need to weigh around 1750kg for that.
Last edited by Carl2 : 06 July 2008 at 13:28.
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Old 06 July 2008, 13:02
magicgreg
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265bhp/tonne for me.
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Old 06 July 2008, 13:05
bluenose172
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Remember he has to take into account the fuel etc in the car too.
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Old 06 July 2008, 13:29
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Yes: a tank of fuel and a fat driver make a big difference (15 kilos for being fat in my case and the fuel weight can add another 35 kilos too).
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Old 06 July 2008, 17:00
Mikkel
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Originally Posted by magicgreg View Post
265bhp/tonne for me.
You have the same car as me with the same mods so mine should be around the same I would have thought.

I never thought about a tank of fuel. Good point. Was 3/4 full at the time I think.
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Old 07 July 2008, 11:16
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Originally Posted by Mikkel View Post
You have the same car as me with the same mods so mine should be around the same I would have thought.
Balls, I counted the car as 1395kgs instead of the correct 1495kgs, therefore making my total 248bhp/tonne, so yes its around the same as yours.

G
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Old 07 July 2008, 11:44
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Yes: a tank of fuel and a fat driver make a big difference (15 kilos for being fat in my case and the fuel weight can add another 35 kilos too).
15 kilos? You lightweight, that's only about 2-3 stone.

Just over 240bhp/tonne. Divide by 3, times by 2. Yeah! I can still do maths.
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Old 07 July 2008, 14:06
jasonius
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