How to u disable the governor, or limiter?

[evergreen96]

In general, how the heck do you disable the governor or limiter on any cars.

For example, On a speedo it goes all the way up to 140mph but its limited by the governor to 110 mph..What gives? beside it was design to protect the engine from over reving

I know that "cars tuner" disable this limiter for the extra umph

 

[vi edit]

Generally, replacing the ECU or similar component with a third party one tuned for performance will effectivley remove any governing of the engine.

One of the biggest reasons that vehicles are governed to certain speeds though is because the tires that are sold with the car are only rated to be safe up to a certain speed.

 

[b0mbrman]

<< Generally, replacing the ECU or similar component with a third party one tuned for performance will effectivley remove any governing of the engine.

One of the biggest reasons that vehicles are governed to certain speeds though is because the tires that are sold with the car are only rated to be safe up to a certain speed. >>



Really? I always thought the government regulated it

 

[d33pt]

alot of luxury cars are limited to 155... such as benz's and bmw's

 

[vi edit]

Nope.

For example: The Nissan Maxima GXE and the Maxima SE models have two different governed speeds because the SE model comes with a higher speed rated tire. One is like 110, the other is somewhere around 125 or so(not absolutely certain on numbers)

 

[MichaelD]

Vi Edit nailed it.

Also, on "lesser cars" (not a Porsche/Ferrari/M3/E50/that upper echelon breed) aside from the tires, the vehicles suspension as stock, is just not up to the task of high-speed manuevering. So, they limit the top speed electronically.

 

[Jzero]

<< Really? I always thought the government regulated it >>


If it was a gov't reg, it'd probably be like 40 MPH....

 

[EagleKeeper]

<< << Really? I always thought the government regulated it >> >>




<< If it was a gov't reg, it'd probably be like 40 MPH.... >>



Actually 45-50 is the most economical speed, but a politician would be cutting their political cohones off to even float that balloon.

 

[Zenmervolt]

Depends on the car. Some older Porsches (as in 1970's) had a rev-limiter built into the distributor. If the engine spins past something like 6,000 RPM, the dizzy grounds out the spark. Honda's A20A3 FI engine (used in 3rd gen Accords and the Prelude 2.0Si) has a soft acting rev limiter at around 6,500 RPM. Most of the time you do not want to disable a true rev-limiter.

Now, a speed limiter is different. vi_edit nailed it. The reason 155 mph is common in BMW and Mercedes is because of a "gentlemen's agreement" that German auto makers have with the government. It's similar to the "agreement" that Japanese auto makers have with their government not to produce cars with more than 280 HP. (Of course there are quite a few 350+ Japanese cars that only have 280 HP officially. )

ZV

 

[Scootin159]

<< Depends on the car. Some older Porsches (as in 1970's) had a rev-limiter built into the distributor. If the engine spins past something like 6,000 RPM, the dizzy grounds out the spark. Honda's A20A3 FI engine (used in 3rd gen Accords and the Prelude 2.0Si) has a soft acting rev limiter at around 6,500 RPM. Most of the time you do not want to disable a true rev-limiter.

<<

I thought that most cars actually had a rev-limiter....or am I just totally wrong?

 

<< << << Really? I always thought the government regulated it >> >>




<< If it was a gov't reg, it'd probably be like 40 MPH.... >>



Actually 45-50 is the most economical speed, but a politician would be cutting their political cohones off to even float that balloon. >>



Exactly.

 

[punkrawket]

my BMW doesn't have a rev limiter on it... i found out the hard way... was driving from stop... kinda accelerating quickly.. not like racing or anything but at a nice pace.. my gas peddle stuck without me really knowing.. i went to shift... :Q:Q hello mr redline... goodbye mr sparkplugs... was not fun

 

[Zenmervolt]

<<I thought that most cars actually had a rev-limiter....or am I just totally wrong?>>

Yes, most newer cars have a protection against over-revving the engine. However, it's not universal and if your car is older and/or is carburated chances are that it is not equipped with a rev-limiter. And as I said, a rev-limiter is not a speed limiter. They perform two different functions. A rev-limiter prevents an engine from spinning significantly past redline. A speed-limiter prevents the car from exceeding a certain speed and thus kicks in before the engine redlines.

ZV

EDIT: If spark plugs were all you lost in over-revving, then your limiter probably did kick in. A severe over-rev will wreak havoc with the valvetrain. It's not uncommon for an engine to swallow a valve if over-revved too much. The valvetrain is the main limiting factor in maximum RPM, which is why a desmodronic valvetrain is employed in certian racing and sport motorcycles. Desmodronic valve activation eliminates the problem of valve float.

 

[ThaGrandCow]

Isn't disabling that illegal?

 

[CocaCola5]

Restricting makes the car cheaper, easier to design using all-season tires and generic suspensions.

 

[aphex]

Mines limited to 140 (maybe 130). Fastest ive gone is 124

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[Zenmervolt]

<< Isn't disabling that illegal? >>

No.

ZV

 

[Grminalac]

You can buy a performance chip for most cars especially higher performing ones. This chip usually increases the redline and also increases the speed limiter. My BMW is limited to 128 I think. With that DINAn upgrade chip i would be able to take the tach to 7.5 grand and 140mph. Its a 318Ti.