I have a 2006 optimax 90 it Plane quickly and hit a top speed in the low 40's then it drops off to a 31 mph top speed but still running smoothly and won't go any faster

Check your oil level. You may have to check your spark plugs and clean or replace them.

Acceleration cut off when reach 30mph - Range Rovers

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Mar 30, 2010 - 16 posts - ‎6 authors
All of a sudden, RRSport HSE 2006 can not speed above 30mph. ... It's only an hour's drive away if your car could go straight upwards. .... My guess is that some control module got fried or out of whack when the power spike ...

WILL NOT GO OVER 30MPH WITH PEDLE TO METAL ...

repairpal.com > Questions > Dodge > Charger > 2006 Dodge Charger

... and a 18 wheeler comes up behind me going 85mph. or more and my car drops down to 35 to 40. ... It would not let me go pass 30mph and it would bog out. .... His truck was barely over 36k. when this happened. ... sudden I was cruising at 30 more or less and could not accelerate or shift gears I could just switch to Drive.

My Chevy Silverado won't go over 25 miles an ... - CarGurus

www.cargurus.com > Questions > Chevrolet > Silverado 1500

CarGurusSep 19, 2012 - His response wasn't even there until the page refreshed when I hit ...The engine would shut off due to a clogged fuel filter not hit 25 MPH and just stopaccelerating. ... when the gas pedal was to the floor but it wouldn't go over 30 MPH?.... When I punch it at 110 or above, it will cut out and drop to 103kph, ...

Starts,Idols perfect Bogs down, no power upon acceleration ...

Hi, you could check your engine mounts.

Cutting out at 32mph - Yamaha Rhino Forum - Rhino Forums.net

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Apr 23, 2011 - 12 posts - ‎8 authors Once it cuts out I let off the gas to let the speed drop a little, it pulls fine then ... The reason I say that is because feathering the throttle gets you 4 mph more .... Spent halfa night starting it and reving it trying to go somewhere but I'd give it ... Join Date: Sep2009 ... 2008 yamaha rhino 700 cuts out at 40 mph. 700 Sputtering with constant throttle
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tires out of balance--bad tire thread damage --hub -going bad -strut /shock going bad

Since it's an Optimax, I'm going to have to defer to an authorized Merc service station. Barring that sounds like a fuel problem, try cleaning with some Seafoam or the Merc equivalent. I'm guessing this after is sat all winter with no love.

sounds like a bad motor or transmission mount try to step on the gas hard and release it quickly while in park do you feel the same thing if you do a motor mount is no good you'll see the engine twisting or raising up on one side the reason why I think its happening at slow speed is the transmission shifts gears and this lets the motor settle back down if not try with no body behind you quick acceleration then wait 5 seconds and hard stop when the car is stopped and you feel a bang from underneath the transmission mount is no good

The stopping distance is proportional to square of speed.

that is 90ft proportional to 40^2 mph.

We can write as 90 = X * 40^2. ( X is a constant of proportionality) .

Which implies X = 90 / 1600 = .05625.

Assume S be the distance at which car stops when the speed is 90 mph.

S = X * 90^2. ( since X does not vary as same car is used)

=> S =.05625 * 8100 = 455.625 ft.

Thank you.

This is your one of your axels.. they are damaged inside.. Get them removed asap it can cause major damage if it brakes loose..each axle costs about $90-100

Check your transmission lock-up. It's programmed to come in at at 40mph. You can replace the lock-up to come in at 60mph or better.
Or you may have some ignition wires going bad or distributor cap has crack in it.