DrEvil

Hi,

Just passing this on to those that weren't there on Saturday (PE)...

Joseph brought his Warender STi 7 along to PE on saturday, now althought the BHp @ the flywheel was only 306Bhp, a good 245BHp was produced at the wheels.. now compared to the original shape scoobs and the MY'01 WRXs that ran, this was a particularly high value @ the wheels... eg a mod'd '97 ('98?) was running around 333Bhp - but less than Joseph's at the wheels, circa 238Bhp @ the wheels..

With my limited knowledge, this would surely suggest the new STi has a far more efficent drivetrain?

Alex

Adam M

you are right alex,

you do have limited knowledge.





























Tend to agree though. Locked diff on type rs tends to give 80hp drivetrain losses, never tried it with open diff but think tat chuck did. Four door cars seemed to give 100bhp loss.

DrEvil

Adam - I can always count on you can't I

Sooo.. if more BHp hits the wheels due to lack of loss thru the drivetrain, then this would go someway (if not all) towards compensating for the additional weight of the car... maybe, dare I say, faster (straight line - oh and round the bends due to better handling) than a pre '01 with the same/aimilar BHP/Torque figures at the flywheel?

BTW - I'm am not including the 22b in that sweeping statement, whole different ball game.

Alex

mutant_matt

Scott ran his STi5 RA on the rollers @ PE on Sat and Merv told him they usually run them in fully locked mode and apparently, you usually get less drivetrain losses with the locked c-diff.

Matt

MorayMackenzie

I went for a ride in a new-age UK WRX STI this weekend... It was, to be honest, totally underwhelming in the performance department. Amazing how the extra horsepower is absorbed by the extra weight, talk about middle age spread! Maybe it would be more accurate to call it the "middle-age" impreza?

Moray
bbs.22b.com

DrEvil

Moray - so if it was a UK WRX STi, it would be only 265Bhp @ the fly wheel, so hence under powered compared to an STi 6 for example which were 280Bhp...

What i was getting at was a similarly powered STi 7 ie. a 280Bhp @ the flywheel one, compared against an STi 6 with 280Bhp - might possibly be about the same 0-60 wise straight line ... just a thought... as even with the improved (reduced) tranmission loses it would still have the additional weight of the car to contend with thou..

EvilBevel

Alex, this might be down to "gearing" ?

I'm not sure, as the more I read about it, the more confused I get about RR's ... was the test done in 4th gear ?

DrEvil

EvilB - could be, as we all know the STi v7 has a 6-speed box... and yes, it was done in fourth gear like the other cars.

Its all a black-art really - init

Denmark

iTrader: (2)

On my my99 i only loose 35hp.
from 247hp runing 1,4 bar,but i get 212hp on the wheels.
It is measered at the guy who makes rally cars in Denmark.

Skassa

johnfelstead

it must be right then.

I think everyone knows that RR's arent acurate, they are only good for showing like for like modifications, and even then you are at the mercy of the weather.

Gearing does affect the results and the STi's 4th (on the 6 speed) is lower than 4th on a 5 speed. You can also take into effect the diameter of the wheels and the contact patch on the rollers.

I cant stand RR's, never take what they say as relevent. But thats just me.

dice

Drivetrain loss is related to speed. Higher gear = higher speed = higher drivetrain loss.

Joseph

And what unlimited knowledge do you bring to the table Adam?
I mean what kind of profession is a Torney?
There is always someone smarter, ********. More like a Turnip.
J.

You are right Alex.

Joseph

Sorry Adam just saw the rest of your thread.
J.
Friends now?

Trout...

The STi 7 in fourth will be running much slower than an Sti V in fourth due to gearing.

Certainly my 243bhp PAW figure gave me a lowly 336bhp ATF. Although last time I had 242bhp PAW and 345bhp ATF - the main change was that PE had their rollers serviced in the interim. Normally very consistent 345ATF, 240ishPAW.

Trout

Joseph

So what should it be ATF then?
My beleif is that it is running 320ish ATF. Oh! It's only running 1.2 bar not 1.4.
J.

SecretAgentMan

Only 247 hp from 1,4 bar? Give your tuner a decent flogging mate. Oh...and there's no way in hell you'll only loose 30-odd horsies in the scoob drivetrain.

You've been had mate....

The PAW quote you've got sounds almost (not quite though)reasonable with the boost - this depends on other mods though - but it should be around 300 at the crank...

/J

[Edited by SecretAgentMan - 3/9/2002 9:49:54 AM]