Dave

From where are you and who are the culprits?

Does the engines have enough power for the application?

An ambulance or a mini bus taxi with insufficient power will be hammered in a lower gear to get it moving.

Hi,

Yes we have 120 HP & 300 NM of Torque this is not the problem, the Drivers Right Foot & "Brain" is the problem.

We have been importing & Assembling these vehicles for 6 years.

I am working in Malaysia.

Tq.

Dave.

Is this engine diesel, LP, propane or gasoline? Do you require a pre made device, or are you capable of assembling components and fitting to the engine?

Should not be a matter of re-inventing the wheel but rather adding a step in the ECM module programming.

Why not contact VM Motori and request that when they program the engine ECM, that they add a step in the program to limit the RPM's to your specifications.

Concept is;

IF: RPM >3,800

THEN: Fuel Solenoid "Off/Closed"

Another approach, ask VM if they have an RPM limiting chip available for the ECM.

Could also try an after market firm that may be able to come up with a chip or programming solution.

Spent part of this summer at the Caterpillar Plant in Joliet IL. on the engine test stand line and saw this and other custom configurations made on an engine by engine basis to the ECM programming based on individual customer spec's.

Nice find, simple solution - GA!

Thank you. Thank you. Thank you.

Can I now trade in my guru status for smart a$$.

Agreed, that is sound advice.

I am pleased to vote GA, thus making you a centurian centurion a hunnerd GAs. Well done!

Thank you. Thank you. Thank you.

Can I now trade in my guru status for smart a$$.

I hear that KrisDel Corp. is handing out certificimacates with sparklies for every hunnerd GA votes a guy gets.

I tried, they won't let me vote for myself. Not even once.

You could use an aftermarket revlimiter for a gasoline engine and set it up to cut the fuel solenoid instead of ignition.

Obtaining an engine speed input might be a challenge.

Are your vehicles equipped with a tacho?

You need someone who can program PICs, you also need a sensor to note when the cylinder one gets injected, a simple sensor can be made from a piezo sounder, working in reverse, clamped to the pipe going to the injector.

Some simple amplification and filtering (the PIC could be programmed to filter as well) may be required to get a reasonable signal form. Then program to allow up to a frequency of up to 3800/2=1900Hz. Then it disables the injector pump solenoid, which stops diesel being fed to it......

Decide on how much hysteresis you need, I would suggest minimal as you don't want the vehicle suddenly slowing down each time the rev limit is reached as that may cause an accident. You just want it to stop accelerating.....

I hope this helps.

ERROR!

I forgot to divide by 60 as well. My bad!!!

3800/2=1900/60 = 31.667Hz.

My apologies to all......

Even the slowest of PICs should be OK for this, even the ones using a BASIC interpreter....easy programming too....

Since engine RPM can be directly proportioned to the available fuel pressure, Is it not easier to just install a pressure pop-off or relief valve after the fuel pump, calibrated to open up and reduce fuel pressure at or near the equivalent engine revolution of 3800 RPM?

With a little trial and error you could just put a block of wood under the accelerator that keeps it from revving any higher than what you want.

Perhaps you could use a little knowledge into the workings of firefighters.

The rules don't apply to them.

Seat belts are not needed because they might have to get out in a hurry.

They are permitted to go around corners faster than the laws of physics allow because they are in a hurry.

That governor is not meant for them, because they need more speed.

A simple block of wood would be removed before the garage door is shut/

In fire mechanics school many years ago I was told this story. If you locked a firefighter in a room with 2 ball bearings, they would break one, loose one, and blame the other shift for what happened.

There are some OK diesel mechanics in Malaysia.

Have you asked around locally yet?

Otherwise on your next sanity trip go to Bangkok. Diesel is king in Thailand and there are really good diesel technicians accustomed to bespoke modifications over there.