The 3rd of October saw the first ever IWOC Impreza rolling road test. Thanks to Jonathan R. for the organisation of getting all the cars there. Seven cars of various different specifications were put through their paces on the rolling road dyno at Power Engineering in Uxbridge. The purpose was not really to find out the ultimate power of each car (well ok there was one car that was of interest), but the differences between models and modifications.
The seven cars were made up of five UK specification and two Japanese specification as follows :-
MY94
Standard Terzo with a slightly modified version, note rear wing and single tail pipe of a Scoobysport exhaust (allied to free flow Ram Air drop in air filter)
Prodrived Terzo - includes Prodrive Performance Pack power upgrade
WRX STi 3 type R with free flow exhaust and filter
WRX STi 22B with Leda type C suspension As you can see above, there were a lot of blue Imprezas floating around! Interesting to see that the 22B and type R both share the Terzo colour, whilst the dark blue mica looks black in comparison. Onto the rolling road. To stop the car in question heading off into the distance it is strapped down....
To see and hear a car, only 10 feet away doing over 125mph is something to behold. Just don't touch those brakes!
Type R the dial on the left reads 225kph!
So how does a Japanese specification WRX Type R compare with the best UK specification of the day?
Last run of the day was left to the 22B. Would it crack 300bhp? Rumours had been heard of 350bhp....... 22B - how fast does it go Mister?
22B rolling along quite nicely ;-)
As well as the cars on the dyno, several other members tuned up to watch. nose of an STi 4 type R along with the 22B
same STi 4 type R, this time along with the blue STi 3 type R
If you were wondering about the results from the day have a look at Paul Strongs web page - THE Impreza dyno data page!
MY95
MY97 (see the picture above)
Type R dyno data the black graph represent power to the wheel, and the red line is added as the car slows down in neutral with the rolling road monitoring the transmission losses....result power at the crank. Note for a 4 wheel drive car we lose near 1/3 of the power!
WRX STi Type R and UK spec. dyno data the red graph represents the best UK specification run with the type R in the white. The UK car actually produces more power under 3500rpm probably due to the smaller turbo. From there the type R gains an advantage but is still tracked by the UK specification. Only at the end at 6500rpm the UK spec tails off and the type R carries on pulling straight into the 7900rpm red line!
Type R or 22B? Which is more powerful? White is 22B, and red is type R....there is just over 40bhp difference at the cursor, but notice how the 22B tails off and the type R climbs into the redline/rev limiter. Sorry about the focus :-(
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