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So this morning, while commuting on the freeway, with my cruise control and maxed out speed of 78, another 451 Smart flew by me, at least 7-10 mph faster than I was going. How is this possible?? I thought the computer limited us to 80mph? I've never gotten above 78 by the way. I have a 2016 Smart Fortwo ED.
 

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Petrol 451s: The limiter is supposed to kick in at 90 mph, though on a few occasions with my pedal to the floor I blasted past the limiter and pegged the speedometer at 100... verified by a GPS and the police officer that pulled me over! He was more amazed it could go that fast and let me off with a giggly warning.

*My speedo actually reads accurately because of my chunky tyres.

Petrol 453s will go 100 all day long. I think their limiters try to stop you at 95 mph.

Petrol 450s will top 85 and their limiters are really aggressive about making you stick to that speed.
 

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I remember reading somewhere here in the forums that they took their stock smart to 117mph. I never heard of smarts having a limiter. Well other than the not so great aerodynamics and the 70hp lol.
If I get larger tires, will I actually be able to go beyond 78?
 

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With an EV car, all that will do is add to the rotating mass and you will go slower... :shrug:

So the limiter doesn't use the "speed" from the speedometer?



When I am at top (limited) speed, the analog speedometer gauge on my car reads about 83mph, but my true speed using GPS is 78mph. My car tires are standard size. It would seem to me that if I used slightly larger tires, with a bigger tire radius, I would go faster. That 78mph would increase somewhat, and be closer to the 83mph on the speedometer.


Is my thinking not correct?
 

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Your thinking is correct. You would lose acceleration with bigger tires that's all.
451s are known for having about 5 mph optimistic speedo.
With an EV car, all that will do is add to the rotating mass and you will go slower...

So the limiter doesn't use the "speed" from the speedometer?



When I am at top (limited) speed, the analog speedometer gauge on my car reads about 83mph, but my true speed using GPS is 78mph. My car tires are standard size. It would seem to me that if I used slightly larger tires, with a bigger tire radius, I would go faster. That 78mph would increase somewhat, and be closer to the 83mph on the speedometer.


Is my thinking not correct?
 

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Our '16 passion gasser will run @ 105 on the speedo on long interstates. The best was a schoosh over 110, limited by wind resistance.


It doesn't feel a whole lot different than 75.


S u b R o s a
 

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Your thinking is correct. You would lose acceleration with bigger tires that's all.
451s are known for having about 5 mph optimistic speedo.
Lose acceleration, but you will make that speedometer much more accurate. 185/60/15 on all four has my speedo absolutely dead on. :D
 

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My 2015 ED shuts down at 83mph, at 75 I can floor it and it gets to 83 in 2 seconds and you feel the SAM kill the throttle...
 

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@Smart car. I just looked at your garage photos. You have done very creative mods and the car really looks good.
Thank you,
All the Aero Kit was my own design, I modeled it in SolidWorks, ran tool paths with CamWorks and used my home garage CNC Mill to cut it out.

I wanted the "Bolt on" looks so all the Aero kit has bolts showing as well as the flare kit.
The H&R Lowering spring sure helped the front "Tuck"
It also took me 17x8 rims, 20mm adapters and 15mm spacers to get the rims out 1.75" past the body panels.
 

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I've got a 2015 (453) Passion ICE and I never take it faster than 75. The steering feels too light and crosswinds move the car significantly. I've been a speed demon with heavier cars in the past. Are you folks doing something to improve your suspension, aerodynamics, road stickiness, etc?
 
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