Well On my work I tried somthing , apparently unkonown to my knowledge(I thought I knew this car in and out) you can take a miata all the way to the rev-limiter around 7500 rpms where mazda apparently built a fail-safe to cut off fuel before and engine damage occurs, so In term a miata can be rev happy all the way until you bounce off the rev-limit and from what I read no damage occurs by this, so all this time be cautious and shifting @ 6500-7500rpms, Well this morning I tried this 3 times, between first and second gear, the whole time I was shitting bricks because my exhaust note is seriously loud thanks to an exhaust leak AND i Did'nt want to get pulled first thing in the morning, So I took the back roads to work, Bounced off the rev limit @ 35mph then again in 2nd @ 60mph, I did'nt take this any further In fear of getting pulled over for my exhaust. but I had this wierd feeling of gratification and new respect for the car...I read all this in the "MAZDA MIATA PERFORMANCE HANDBOOK" I got this book in the mail yesterday, I like it!

 

lol...7200rpms is the fuel cutoff. Its not bad but I really wouldn't leave it up there for more than a second or so at a time. I take mine to 7k all the time, no harm.

My 90 w/ do 37 off the revlimiter in first and around 63-64 on the limiter in second.

 

My fuel cut-off is 7500k rpms, If my exhuast was more subtle, I could do This at night, but the way it is now , you can hear me comming from 2 miles away.

 

your's is more peppy than mine is right now, I need new o2 sensor,Get the leak in my exhaust fixed , And I think I need to replace my o-rings on the injecters, there's a bit of hesistation @ 3k rpms , but its brief.

 

No, your fuel cut-off is actually closer to 7100 RPM on the 1.8L, as I recall. The 1.6L has a 7250 RPM cut-off. The tachometer is not incredibly accurate, that's why it looks more like 7500 RPM.

 

The spedo is also not very accurate either. At 100km/h indicated it's out about 6-7km/h according to my GPS. Oddly enough so is my Tribute. Go Mazda/Ford!

And it isn't actually fuel cut, it's spark cut. At 7000rpm cutting fuel could be very very bad. Lean .... booom!

And I thought the revlimit on the 1.8 was around 6900?

 

with a link, i know someone regularly running their n/a 1.8 upto 8500 rpms.

 

I wonder at what point valve float occurs on stock valve springs?

 

from the discussions i've had: ~8500

 

wow ,but I can't believe this is possible to do this without engine damage, and It has a kick to, Im not saying stay gas to the floor and letting it hit the rev-limiter for more than a sec or so , but taking it the point of spark cut off every gear without damage to the motor...Its probly better since Im running full synthetic right?

 

The only reason I can ever see bouncing off the revlimiter is while autocrossing. I often will hit revlimit for a couple of seconds to avoid a gear change. When running through the gears hitting the revlimiter before each gear change is a waste of time.

 

What he said.