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Why RS4 has mega midrange?
Posted: Tue Apr 21, 2009 10:06 pm
by kn9
Had a quick play on the dynoplot website.
The RS4 graph has such a huge midrange hp and torque ie around 3000-6000rpm.... compared to similar peak power engines eg. S4, and even bigger displacement eg. nissan rb30 and toyota supra 3.0l.
what design by cosworth made this possible?
RE: Why RS4 has mega midrange?
Posted: Wed Apr 22, 2009 3:32 pm
by derdle
Just a guess but variable valve timing and two big f*ck off turbos ?
RE: Why RS4 has mega midrange?
Posted: Wed Apr 22, 2009 4:09 pm
by Contigo
Yep Cosworth fettled with the cylinder heads and this resulted in a 50% power increase over the S4.
RE: Why RS4 has mega midrange?
Posted: Wed Apr 22, 2009 4:12 pm
by Contigo
Posted: Wed Apr 22, 2009 4:29 pm
by Spunbigendbearing
Cosworth has a reputation regarding cilinder-heads;they also machine and provide the heads for the 1000+ bhp EVO's in Florida.
The Merc. 190E 2,3-16 is a nice N/A example from the eighties.
Posted: Wed Apr 22, 2009 4:56 pm
by kn9
http://www.dyno-plot.co.uk/dyno/dynoplo ... /index.htm
Here's a comparison plot of 3 600hp cars:
MRC tuned RS4 2.6l
Nissan skyline RB30 3.0l
Toyota Supra 3.0l
The rs4 just monsters the others in midrange torque and hp. It has lots more hp from 2500 rpm to 5250 rpm.
Posted: Wed Apr 22, 2009 7:15 pm
by Blue_Thunder
Just took a look at that and was a tad sidetracked when I saw the 700+bhp 1.8T!!!
http://www.dyno-plot.co.uk/dyno/dynoplo ... not-UK.htm
Posted: Thu Apr 23, 2009 12:37 am
by rikrose
GRENADE!
*dives for cover*
Posted: Thu Apr 23, 2009 8:13 am
by kn9
Just look how far to the right the power curve is for that 1.8l...
It's just like those 1000hp supras that has only 1000rpm of power range.
Of course, here's MRC 3.0l vs the ultimate torque monster... twin turbo V12!
http://www.dyno-plot.co.uk/dyno/dynoplo ... /index.htm
Only problem is, too much torque will just become burnt rubber on the road and not much speed.
I think a well-tuned rs4 hits the sweet spot between low-midrange torque and peak hp....