Is there any restriction on the length of the pipe to the MAP sensor? I'm trying to work out where to put the MJLJ in my Land Rover install where it's well out of the way of water so might end up wanting to use a pipe several metres long.
Paul
map pipe
Moderators: JeffC, rdoherty, stieg, brentp
pipe length
the longer the pipe the bigger the delay from the the manifold to the MAP sensor, so the longer you have it the more latency you get,shorter is better
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Todd Charles
- Posts: 2
- Joined: Mon May 24, 2004 5:08 pm
Josh is right but it is prett
Josh is right but it is pretty minimal. I wouldn't concern myself with it. Try to keep it short as possible but keeping the unit protected is much more important.
Todd
Todd
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Luca Lagonigro
- Posts: 0
- Joined: Sun Feb 29, 2004 9:23 pm
According to the Megasquirt i
According to the Megasquirt info site www.megasquirt.info at page: http://www.megasquirt.info/manual/mwire.htm#map the lenght of the vacuum hose is not critiacal.
>>> from the site
<b>
Don't worry about how long your MAP sensor vacuum hose is. Intuitively it seems that shorter should be better. However, a few people have done tests to see how bad the effect of a long hose was on vacuum signal propagation. With a ~100 foot (~30 meters) coil of rubber tubing in between the MegaSquirt and the engine, the result was that no delay was apparent. This was with about a 10 millisecond resolution clock. The reason for this is that air has so little inertia that it moves very quickly in response to a vacuum (this is how we fill the cylinders, after all!).
</b>
Both Megasquirt and MJLJ uses the same Motorola sensor, I don't know about the MJLJ resolution but I think you can just place the MJLJ wherever you want within the car whitout even bother.
>>> from the site
<b>
Don't worry about how long your MAP sensor vacuum hose is. Intuitively it seems that shorter should be better. However, a few people have done tests to see how bad the effect of a long hose was on vacuum signal propagation. With a ~100 foot (~30 meters) coil of rubber tubing in between the MegaSquirt and the engine, the result was that no delay was apparent. This was with about a 10 millisecond resolution clock. The reason for this is that air has so little inertia that it moves very quickly in response to a vacuum (this is how we fill the cylinders, after all!).
</b>
Both Megasquirt and MJLJ uses the same Motorola sensor, I don't know about the MJLJ resolution but I think you can just place the MJLJ wherever you want within the car whitout even bother.