Speed Limiter Adjustment Down - Yes down....

Don't know about that but there is a device that can be put on the car and you can read the cars speed history from you smart phone. Not a limiter, but a monitor. I'd let the kid know the monitor exists and if he tops eighty, he loses the car.

 

I suppose I'm very tempted to say...don't give him the "tool"--the vehicle, if you don't trust that he's educated and responsible enough to use it safely.

Putting an 80 mph cap would accomplish what?
Very deadly accidents can happen at 80 mph, and everywhere above and below that arbitrarily chosen limit.

I don't mean to sound snarky, but if your son isn't ready to be trusted to drive safely and obey speed limits? Then maybe he's not ready for to be given the vehicle?

 

80 is low for Dallas standards.

 

I don't like going over 80 kmh.

 

Pertronics makes Rev Limiters that can be adjusted to just about any rpm. I'm not sure how the Prius engine management system would react to something like that but you can do some research.

 

Confusing kilometers per hour with revolutions per minute?

 

A rev limiter on a Prius would certainly limit engine power output, but wouldn't limit the car to any specific speed unless we make specific assumptions about wind and grade---or lack thereof. Probably not a good idea, because it might unduly hamper responsible hill climbing or merging.

 

Theoretically, the Prius can reach its topspeed with the ICE limited to 2600 rpm. Lack of power will probably prevent it reaching it like that, except going downhill.
To limit the car to 80 mph by limiting the rpm would mean a limit to 1325 rpm.
On a flat road, the car will still be drivable if you keep under 2600 rpm, but not if you keep under 1325 rpm.

 

80 ??? I don't think I ever hit that in the last 3.5 year .... it is not the prius but your son you need to limit....

 

I see your hypothetical point that that low engine speed (or even slower, by my calculations) would allow up to 80 mph without overspeeding MG1. However, aerodynamic drag would make 80 mph at 1325 rpm highly improbable except down hill.

According to Toyota's BSFC chart, the car needs 2200 RPM to maintain 120 km/hr [74.6 mph] (under unstated conditions, which I'd assume include a level road).