GR Yaris How much power is needed

Interesting posts . This is one very fast little
Car in a straight line and it’s ability to put down power in any situation on any surface is little short of amazing for an out of the box motor car . As most of us are normal
Punters it seems to an old geyser who started punting four wheel drive cars in the early seventies that being content with the GRs outstanding performance is all most will need or even be half capable of exploiting. Years ago when running a tweaked Laser TX 3 by Murray Coote ( ARC CHAMPION) I got the crazy idea I needed an exhaust pyrometer so I asked the great man why not ? So told me to work out how long I was on boost each day ! Well it worked out as about two minutes of WOT and max in each gear in daily driving! On track or rally max throttle max boost but once you lift off , poop! They used to have that wonderful rotisserie tick over noise ! So folks who wish to spend squillions go for it but don’t kid yourself ! This is a great , probably the greatest production car of its type . It will be hard to follow. Enjoy !
 
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Steve said:
That site is great, used to be called letstorquebhp and is a stato’s dream.

It also gives pretty accurate estimates when compared with real world performance tests. For instance it shows that even with 257 bhp (that we all know is lower than the GR’s actual power), a kerb weight of 1,280 kg gives a better 0-60 time than 5.5 s:

4WD - 257bhp & 1280kg
​
Power to Weight:​
204 bhp/ton
0-60:​
5.1
0-100:​
13.2
60-100:​
8.1
1/4 Mile ET:​
13.63
1/4 Mile Terminal:​
101
Dragstrip 1/4 Mile ET:​
13.28
Dragstrip 1/4 Mile Terminal:​
104

If you put in 270 bhp and 1,280 kg you get much closer to the actual recorded figures for our cars:

4WD - 270bhp & 1280kg
​
Power to Weight:​
214 bhp/ton
0-60:​
4.9
0-100:​
12.9
60-100:​
8.0
1/4 Mile ET:​
13.41
1/4 Mile Terminal:​
103
Dragstrip 1/4 Mile ET:​
13.06
Dragstrip 1/4 Mile Terminal:​
106

So 270 bhp, which is what many dynos have recorded for standard cars, tallies with the estimates above, and real world times.
Click to expand...
I think, can’t be sure, the 5.5 is due to a 2nd second gear change from 2nd to 3rd. If you don’t account for this (which some tests have) the 0-60 is reduced by circa 0.5 seconds

Reason we have high 0-60 is becuase most outlets are quoting 0-62mph (0-100kph) and converting this directly

However! The Yaris has a terminal velocity in 2nd gear of 61mph. So if you time 0-60 you get a much quicker time than the 0-62

Just a bit of background
 
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