Originally Posted by 92verty
Whoa man!!! What the hell? 3.63's are causing this? Whats the factory ratio for a 92? Does anyone know?
Sorry, didn't mean to freak out the new guy.
If you read all the post, that's in second gear with an elevated rev limiter. It's a dedicated autocross car.
Your '92 came with a 4.30 rear end ratio.
With stock gearing and tires about the same diameter as 205/50/15s you would be around 3700 rpm at 70 mph.
The rpm, gear ratios, and tire diameter determine the speed. So unless your clutch is slipping or the tires are spinning, you will be traveling the same speed at the same rpm as everyone else's car with the same transmission, rear end and tire diameter.
The question I think you were trying to ask is "Is it normal for a Miata to rev that high on the highway?" The answer you should have gotten back was "Yes, you will notice that your Miata likes to be at a higher rpm for a given speed than some other cars you may have driven." Had they taken the answer a little further it would have gone something like this "If your car is up to date on it's maintenance and in otherwise good condition, you will not hurt the motor revving it even higher. In fact the closer to the rev limiter (and yes there is one to protect you) you get, the more responsive the car will seem".