Idle up switch or hand throttle ?

Last time I looked I had an "anti stall" switch on my steering pump.....you may have one too?

Might have a tinker as I bounce all over on rocky stuff and it'd be nice to "brace meself"

helijohn wrote:

Busta wrote: You won't gain any extra charge from increasing the revs with a hand throttle. The alternator is already putting out 14.4v at idle. As you draw more current, it will put more load on the engine and the idle control valve will add air to maintain the revs. Basically, the system you are trying to create is already fitted.

That's assuming your alternator is working as it should. If it isn't, get it fixed!

That's interesting because some systems create an idle up when in use. Now I thought it was precisely for giving more juice while the load is slowing the motor.

Regarding the hand throttle, I use it when the engine (Diesel - Pajero) is cold for a few hundred yards. Some use it so as to "creep" (auto) at a speed that is more desirable. I used mine on my Pinin to overcome a slightly defective idle sensor.

Air-con systems often increase the idle, but the compressors create a consistent load that is much higher than the alternator- typically 3-4hp for air-con compared to around 1hp for a 60amp Jimny alternator at full load.

Busta wrote: You won't gain any extra charge from increasing the revs with a hand throttle. The alternator is already putting out 14.4v at idle. As you draw more current, it will put more load on the engine and the idle control valve will add air to maintain the revs. Basically, the system you are trying to create is already fitted.

That's assuming your alternator is working as it should. If it isn't, get it fixed!

What about Amps though eh?

It will always charge at the same volts but the Amps depend on the draw. Hence the need for an increase in revs to cope with the increased draw on the battery.

Kirkynut

It depends what extra things you are running but on a standard car there is plenty of current available at idle to run everything indefinitely and charge the battery.

In terms of power, the maximum the alternator needs (assuming 50% efficiency) is 2hp, and at idle the max hp of the Jimny engine is 6-8hp, so there's plenty of power available.

In terms or RPM- The alternator pulley is 1/3rd the size of crank pulley, so at idle it is spinning in the 3000rpm range where it is at 90% of current output (50-55 amps).

To get to 100% (60 amps) needs a double in engine speed.

If you are expecting to run an electric winch all day then increasing the idle by a few RPM is the least of your worries.

If you want a system that will hold the engine at a set RPM regardless of load (for 'crawling'), you need to buy a DIY cruise control kit and modify it. It's the cheapest way to make a system that monitors RPM and adjusts the throttle to maintain it (essentially, an electronic governor). A simple hand throttle wired onto the throttle body like the foot throttle won't hold steady revs under load, so the engine will bog going up hills and run-away going down hill.

If you only want to up the idle speed while winching then you can use a hand throttle, what exactly is it you're trying to achieve.

This is not a "proper" cruise control as it doesn't adjust the throttle climbing hills etc but it should work as a "hand throttle"
The fitting instructions are further down on a pdf
If you want a "real" cruise control they also do one with a vacuum servo linked in to a speed sensor and it works as I fitted one a couple of years ago but it's £109 and won't work at a standstill.

This one is more mechanical and cheap lol

www.conrad-electronic.co.uk/ce/en/produc...A.ASTPCEN26?ref=list