The torque & power of WRC cars, part 1

[Mirek]

I think that 750 Nm was at ca 3000 rpm...

In fact I saw even a WRC dyno chart but it was very bad one. It was one of the first Fabias 03 with problematic electronics and it had only ca 300 Hp (4000-5500 rpm) and 550 Nm (3700 rpm). It was realy bad one...

[OldF]

]I think that 750 Nm was at ca 3000 rpm...

In fact I saw even a WRC dyno chart but it was very bad one. It was one of the first Fabias 03 with problematic electronics and it had only ca 300 Hp (4000-5500 rpm) and 550 Nm (3700 rpm). It was realy bad one...

Thanks Mirek,

I think I’ll make a graph of those figures. I’ll also try to find a dynographs of some kit car. It could be quite similar to a dynograph of a S2000.

Last year at NORF a team of the Finnish magazine VM made (or they have made it for several years) some speed measurements at different places and one was after a tight junction (SS18 Himos) when they accelerated from quite low speed to a long uphill.

Fastest:

Kopecky, Skoda 148 km/h
Atkinson, Subaru 147 km/h
Hirvonen, Ford 146 km/h
Aava, Mitsubishi 146 km/h
Grönholm, Ford 145 km/h
Loeb, Citroen 145 km/h

So by this result power was not a problem for Skoda. Skoda also had the biggest stroke (93,5 mm) / bore (82,5 mm) ratio of the WRC cars that is, as far as I know, a good thing for torque.

[Mirek]

Hmm, that is interesting but everyone says that the 20V engine in Fabia is weak. Maybe just a good run from Kopecky or mabye the aerodynamics of the car was different.

I'm sure that Fabia 03 had never more than 330 Hp. Fabia 05 maybe about 340 with water injection (Fabia 05 was the only Skoda equiped with that). Fabia 03 had reasonable fall of power in 5500 rpm. And even 05 also have not more than 650 Nm...

[dimviii]

a dyno sheet from a friends evo 6 gr A was at 530Nm at3700 and 320 bhp at 4800 @1,9 bar. with turboelf gas

this may be usefull
i have an evo8 with exaust catless,programm in the oem ecu and 1,7 bar overboost with 1,5 ct
i had a race with my friends evo 6 gr A for about 40km/h to 200km/h
at the go from 2500rpm with 2nd gear(not antilag in the gr.a EVO)was slightly faster, after a second and when i was at 5000rpm my evo was much more faster gaining about 4-6 metres at each speed
finally at 200km/h my evo was about the length of 5 cars faster.
all the difference was maid when i was reaching 4500 rpms...
it was obvious that the restrictor was acting badly!
the group A evo6 of my friends was championship winning car at greek hill climps

my evo weights at 1480kg the evo6 was at 1280 kg
my evo is dynoed at 349 bhp at 6670 rpm and 432 Nm at 3650 rpm

the cars had their dyno at different dynos(maha for me, mustang for the evo6)

my opinion is that a wrc must be at circa 350bhp and 650-700 NM

[Viking]

Andreas Mikkelsen says in this vid (Norwegian)
http://webtv.tv2.no/webtv/?progId=219957
that his car has 360hp and up to 850! nm.

[OldF]

Here’s the latest one build on information from Mirek.

Ford Focus 06, 750 Nm @ ~3000 rpm & 350 hp @ 4500 hp. The graph is little mixed but I tried clear it up with the explanations on the chart.

http://i267.photobucket.com/albums/i.../FordWRC06.jpg

There are three different curves. The blue and red torque curves are overlapped at the end. Red and green curves are overlapped in the beginning.

As you can see it’s again the same phenomena, the peak power is 365 hp @ 3900 rpm, not 350 hp @ 4500 rpm. At the en I made the power curve go true 300 hp @ 6000 rpm as Ford says on their web site. The two other are the torque peak moved to 3500 rpm. The red dotted power curve is overlapped with the blue curve. On this case peak power is 382 hp @ 3900 rpm, very close to the torque peak. The third one is the “original” moved to 3500 rpm as it was (not going true 300 hp @ 6000 rpm). As you can notice moving the torque curve from 3000 rpm to 3500 rpm increased the power from 365 hp to 413 hp so even few hundred differences in rpm have a huge impact on the peak power.

Otherwise this makes sense (torque peak between 3000 – 3500 rpm) because the Fords are also driven with very low revs, as Hoover machines, to quote Mirek.