Barnaby

Here's some fun for a Sunday afternoon....

I've been trying to calculate power to weight for a number of scoobies:

__________power___weight__BHP/Tonne

STiV_______276_____1270_____217
STiV RA____276_____1210_____228
UK GT______215_____1235_____174
UK GT PPP__240_____1235_____194
WRX________215_____1385_____155
WRX PPP____240_____1385_____173
STi7_______260_____1470_____177
STi7 PPP___300(?)__1470_____204
Evo6_______276_____1350_____204
Clio 172___172_____1059_____162

Last two added for interest value
Some of the numbers are probably a bit off, especially on the imports.

[Edited by Barnaby - 9/1/2002 5:16:47 PM]

Barnaby

I wish somebody would take 200kg out of my STi7

[Edited by Barnaby - 9/1/2002 6:45:54 PM]

Blackscooby

Our 205 1.9 GTi hillclimb car (Road legal)

180Bhp (anticipated power when completed),
850Kgs,

211 BHP/tonne.

Cool

But not as cool as Johns 600+ bhp/tonne !



[Edited by Blackscooby - 9/2/2002 9:52:02 AM]

Type_RA

importsti

...thats why I love the STI V5...
I prefer the 4 door plus lots of motorway mileage mean that the
RA is too tiresome....

Barnaby

I'm not suprised an RA owner is smiling!

Here's some more to add to the fun....

___________power___weight__BHP/Tonne

355_________350_____1350_____259
911(996)____296_____1370_____216
BMW M3______343_____1570_____218

Type_RA

Yep the gearing can make motorway journeys more of an effort but I dont do many motorway journeys in the RA . The 1210kgs is for the no kit version the V-Ltd are a bit heavier as they have the electric pack and aircon back in. Probably more like 1240/1250 kgs but still pushing nearly 220bhp/ton in standard trim. The short gearing and low lag turbo makes the mid range simply stunning. Not sure how close they are but the 1 to 5 ratios of new 6 speed STI seems similar to the 1-5 of the RA box (ratio wise). A standard UK 4th gear is pretty similar as my 5th gear ratio.

johnfelstead

They are all pretty naf. 220BHP/tonne is tame when you look at what some road cars have. The reason the TypeRA feels much quicker than most scoobs is down to the gearing more than the extra bit of power/weight. You also have the fabulous engine that is on boost from 3300rpm all the way to 8200rpm in the STi5 version.

The car i am building right now has 640BHP/tonne roughly, and yes, it's road legal.

catflap

westfield fireblade 130bhp______430 kg________302 bhp/tn
oh and thn theres the busa 180 bhp_____440kg_____409 bhp/tn

What you building john?

johnfelstead

Ariel Atom 1.8 K series Supercharged

290BHP 450Kg 644BHP/Tonne

and it has all the right bits to make it work.

Makalu

EVO mag has pages of this kind of info at the back.... could save you the trouble of getting your calculator dirty?

QUESTION RE: WRX PPP rated at 240 Bhp - what is the figure likely to be running Optiumax? Prodrive quote about 245 for normal SUL and 240 for normal unleaded...

Mak.

Barnaby

Haven't got an Evo mag to hand. It wasn't too difficult to get the data anyway, took just a few minutes on the net.

Interesting that an STi7 would need 340BHP to match the p/w of an unmoded type RA!

Mossman

Hi John!

Is the Atom going to be ready for the Sept ring trip!?!? here's hoping!!!

Mossman

NDT

Don't agree with the sums -
add the mass of the driver to that of the car, otherwise it's meaningless - that, plus some fuel is the real mass that has to be hauled around.

Obviously this has a much bigger impact on the Atom's figures than on the heavier cars. But it's still going to be a hoot.

One other thing though -
How do you get the right compromise in terms of suspension setup etc on something like an Atom / Westfield etc?
When you add a passenger to a 'normal' car you make a relatively small difference in terms of total mass and position of CoG. (say 1300kg car, 75kg driver, 75kg passenger = 5.5% increase)
Do the same in a much lighter car and you have changed these things by a much greater extent. 75kg passenger in the Atom is a 14% increase over car and driver alone...

johnfelstead

No, the atom wont be finished until November, we are trying to sort a loaner with half the power though, not counting on that at the moment. We are doing a huge amount with this car no one has before, it's got F3 wings front/rear, 6 speed sequencial box, full data logging, full rose jointed/roller bearing suspension. We are running full race brake setups, the list goes on. it will take some setting up but should be a rather rapid piece of kit.

The car will be setup with driver and average weight passenger in the car to get the corner weights sorted. It's pretty much always going to have a passenger in there i would think.

Andy.F

Of course, everyone has a mate with something faster

It's a westfield bodied special chassis with 2 x Hayabusa motors in it.......
4 wheel drive, running F3 pushrod suspension and AP braking system
2x180 bhp 480 KG - P/W = 750 bhp/tonne....... Should it start to feel slow (they all do eventually) he plans turbocharging the rear driving engine just to get to the 1000bhp/tonne......gulp !