Originally posted by Knestis@Jan 27 2006, 09:11 PM
It all comes back to maximizing the area under the torque curve and those little changes can in fact become meaningful, to a race-winning degree.

K
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Kirk... Thanks for the clarification as to the function of the SIR... I'm sure there are still people who aren't getting the significance of how this works yet, but they will eventually...


As for your closing comment... Let's remember one thing... THIS IS IMPROVED TOURING... You just can't do THAT much to make a lot of changes to these curves... Certainly nothing more than can be done today... This isn't like a different cam profile... or anything that changes the curve at all... it just cuts it off at a specified airflow...

I don't know if it's been mentioned, but Bob Dowie has tested these, both on the Dyno and on the track... he reports to us that they have yet to make ANY adjustments to any of the FI cars... They react as if it's not there, right up until it is (sonic...)... On Carb'd cars, they don't even have to change jets...

Like Joe has mentioned... You MIGHT be able to squeeze 1, maybe 2 hp out of a good MOTEC system with this in place, but otherwise, the engine is blind to it right up until it hits sonic...

It keeps race cars as race cars... Or, in NASCAR's case, race trucks... They'll be using a similiar SIR device at the large tracks this coming season... WHY???? Because restrictor plate racing SUCKS, and hurts drivability... SIRs do NOT...