One other point....IF there was a misclass, was it really 5 hp? I see some opinions here that the ECU issue is responsible, if so, it's a moot point...but I also see opinions that a late year compression bump is responsible. I'd think that in reality, IF those numbers are accurate, it's a combination, so we're really talking about a possible 2 - 2.5 hp misclass. Which is a weight misclass, off the top of my head, in the 25 -35 pound range, give or take a pound or two.

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The facts:

the '94 miata 1839cc motor originally came out with 128hp and was classed at 2380lbs

the '95-'97 miata 1839cc motor was improved and uprated to 133hp, an increase of 5hp, and was added as is no additional weight.

the '96-'98 Z3 1895cc motor was rated at 140hp was originally classed at 2675lbs and has been brought down to 2600lbs

I think that Jakes states pretty clearly here that 2.5hp -> in a 25-35lbs of weight so by this we get 7hp -> in 75-120lbs of weight. So how does 133hp -> 140hp equate to 220lbs?? If on the other hand 7hp does infact justify 220lbs, then 1hp -> 31lbs and the 1.8l Miata should gain 150lbs at a minimum. If on the other hand the Miata is correctly classed the the Z3 should drop at least 150lbs. Seems pretty simple to me.


James