What RPM's are you guys running around 70mph?
06-09-2010, 07:03 PM
#23
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".
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06-09-2010, 07:23 PM
#24
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Thanks Chris,
Yeah, i found that i have the 4.30 final drive. And i totally ignored where you did state that was in 2nd gear. So my bad man. I was not really that surprised to see around 3500 @ 70mph. It reminds me of my buddys Toyota Corolla Gt-s. That thing is screaming at 70, but its a 86. And i know about the tire/ wheel combo that would have a dire effect on the rpm at speeds etc. I just thought since i was running 17's that at 70 i would be a lil' lower that's all. And it seems that most people are saying around 3.5 is the norm.
So i am right up to par, thanks for the insight however.
Yeah, i found that i have the 4.30 final drive. And i totally ignored where you did state that was in 2nd gear. So my bad man. I was not really that surprised to see around 3500 @ 70mph. It reminds me of my buddys Toyota Corolla Gt-s. That thing is screaming at 70, but its a 86. And i know about the tire/ wheel combo that would have a dire effect on the rpm at speeds etc. I just thought since i was running 17's that at 70 i would be a lil' lower that's all. And it seems that most people are saying around 3.5 is the norm.
So i am right up to par, thanks for the insight however.
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06-19-2010, 11:48 PM
#32
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stock diff gear and 99 transmission on my rotary swap i'll be at 71.5mph at 8000 rpm in 2nd. 
and at 9700rpm redline in 2nd I'll be at 88mph, making approximately 1.21 jiggawatts to the wheels
and at 9700rpm redline in 2nd I'll be at 88mph, making approximately 1.21 jiggawatts to the wheels
Last edited by N3v; 06-20-2010 at 12:23 AM.
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06-20-2010, 12:47 AM
#34
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hella long gears.
i want 6 speed.
PS here is a vid of a 2nd and 3rd pull.
http://www.youtube.com/watch?v=Hp_T2_8j8To
i want 6 speed.
PS here is a vid of a 2nd and 3rd pull.
http://www.youtube.com/watch?v=Hp_T2_8j8To
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