But on automatics, whats the difference between "park" and "neutral"?
for one in park=4000 rpm rev limiter,in neutral, not so....curious why you need to know this?

15.2@89mph 2.171 60ft. 9.830 1/8 R.I.P. "LULU"
Park puts a parking pin in the gear system to keep the car from moving, neutral does not have this pin, and you can move/roll the car in neutral. Obviously when you park the car you don't want it to run away, so put it in park, neutral is for the car getting towed. You can feel the car rest against the parking pin in park if you park on a hill, put it in park, and release the brake, it rolls a bit then stops, the thing its stopping against is the parking pin.
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Or put another way, "park" is the reason why almost nobody with an automatic bothers to set their hand brake.

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^^^I still do my hand brake on a hill. Flat ground you shouldn't have any problem but on inclines or declines I always use the handbrake. Sometimes stories about cars rolling away and wrecking themselves are all the proof you need.
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Thanks. I always knew there was some sort of brake as the difference, but had no idea about the rev limiter. I was just wondering about it because I was making some before video of my exhaust sound. When researching my exhaust, I noticed a lot of people were asking about Borla, so I thought I would do a before/after video of the sound once everything is done. Are you sure there isn't a rev limiter in neutral also? Because everytime it got to about 4K it cut off. I couldn't get high rpm.
you also have a rev limiter in neutral, its 4k rpms. If you roll the car at like 5mph the rev limiter lets you go up to redline