Well the current WRC's don't really have it either...
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Well the current WRC's don't really have it either...
Quote:
Originally Posted by SubaruNorway
Those were the days. About ten years ago the sound was great (higher revs) and driving more spectacular. BTW, IMO the 1998 Impreza was the best looking Impreza ever.
here we agree :p :
That's why i have a 99' 2 door impreza ;)Quote:
Originally Posted by OldF
is it by chance a 22b? :eek:
Superb videos, the Sierra is amazing ...
Haha no it's a 2.5RS NA. Made in California i think and ran in New Jersey.Quote:
Originally Posted by dimviii
http://photos.streetfire.net/photo/_1031285.htm
Quote:
Originally Posted by dimviii
Haha no it's a 2.5RS NA. Made in California i think and ran in New Jersey.
http://photos.streetfire.net/photo/_1031285.htm
There is a 22B registered in Norway though, for sale ;)
http://imprezadriver.com/phpBB2/viewtopic.php?t=15006
ALS explained..
Firstly, boost is controlled very acurately by using 2 fuel injectors as air valves, these feed the boost/atmospheric pressure to the waste gate actuator, allowing minute and very fast acting boost control.
Secondly, the normal method of controlling engine idle via an idle control valve, that bypasses the throtle butterfly is dispensed with, the static idle is set in the old fashioned way by a locked off bypass screw.
Thirdly, where the idle control valve used to be, a new valve is fitted that has a solenoid controlled valve (looks like an engine inlet valve internally) that can open/close the throttle butterfly bypass orifice very qickly.
Forthly, a miriam turbo shaft is used to withstand the massive increase in turbo temperature generated by ALS.
Fifth, there is no dump valve used on an ALS equipped engine, the whole point of ALS is to keep boosting the engine, even on closed throttle.
The way it works is that when you come off the throttle, for example braking hard into a corner as you describe.. the throttle butterfly closes as per normal, once the boost drops to a certain level, the ECU starts to pulse the Throttle butterfly bypass valve, this has the same effect as you constantly stabbing the throttle on and off very quickly, this means that the engine is being driven by the ECU as though it wants to accelerate again, however this occilation of the throttle bypass valve is happening so fast, it has the effect of allowing the turbo to stay spinning yet produces no additional torque to drive the car forward. The ignition timing is also controlled during this off throttle period to again reduce torque yet maintain boost presure.
The effect of all this is that massive heat is generated in the turbo exhaust side, which ignites all the excess fuel, there is no deliberate overfuelling going on to explode the turbo impellar area.
The most modern of ALS systems on the current world rally cars are far more efficient due to them being so finely controlled unlike 10 years ago, which is why the ALS banging is less apparent on the modern cars.
Really? They sounded w**k as far as I'm concerned. Whever you get a driver in a Cossie who isn't on it you just hear this horrible banging noise from the anti-lag which lets everyone know that they are too scared to have their foot on the throttle.Quote:
Originally Posted by big_sw2000