Originally posted by Bruce Shafer@Sep 13 2005, 03:19 PM
Try 195 HP @ rear wheels prior to the restrictor plate. SCCA has the dyno sheets. :P
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First, let's just get this out of the way... the restrictor plate has NO effect on these motors... The throttle plates are NOT the limiting point of these engines, and were WAY larger than necessary in the first place, so the restrictor is a non-issue and hasn't slowed anyone down...

As for the data... using the data Bruce has provided, which, no offense intended, can be considered an over-the-counter example of a shop-built car (Bimmerworld, right???), the BMW E-36 needs to weigh 3,100lbs in ITS based on the current classification process using dyno data for HP figures, BEFORE adders...... And that weight would STILL put it at the very top of the performance envelope...

If this car were being classified WITHOUT Bruces data, but rather simply using stock hp figures as we do with all the other cars, it's weight would be about 3291lbs BEFORE adders...

NONE of these numbers or the fact that we are discussing this has anything to do with the cars on-track performance or finishes, etc... It's all simply based on the mechanical properties of the car as it exists in race form... JUST like we figure all the other cars we've classified/adjusted...

The baseline for the class is basically the 240Z or the 2nd Gen RX-7, so these numbers are in comparison to equally as well known values as these two cars present...

There isn't a BMW "witch hunt", and no one is out to "get" the BMWs... These are hard numbers based on real information and derived from a defined process...

So, either way (Bruce's numbers or derived numbers), the BMW is WAY underweight to be fairly classified in ITS... OR, it desprately needs a more effective restrictor... At it's current weight (2850lbs)... It needs to be restricted to approximately 220+/- flywheel HP to be on par with the 240Z and the 2nd Gen RX-7...

Fire away...