Map sensor usage?
 

This map sensor thing is really starting to scare me. How can the ECU not use a map sensor that doesent use a line to detect boost?!?

Using maps off off intake temps and TPS sensors would be crazy. And if these things are only 2 bars, id be SOL if I wanted to run 14.7+ psi. I know a few people running 15,16,17,18 lbs of boost, and to reah my power goals I may need to someday also.

Can someone explain this no MAP sensor concept to me?

Relax Tony.
The Microtech does indeed use a map sensor.
They are fitted inside the box itself & have a hose tail sticking out the side of the unit.All you have to do is run a vacuum line from the manifold to the ecu(the line is supplied with the unit).
An external map sensor can be ordered as an option when purchasing your ecu.(same type as haltech).
The internal map sensor is good for up to 20 psi.If you are planning on running bigger boost then go for the 3 bar external option.
Jon

Ok, I was confused. I didnt know there was a nipple on the ECU for MAP functions. So then infact, its not a true 2 or 3 bar MAP sensor, its just good to 20 psi? 1.5 bar?

Ya I think it's just called 2 or 3 bar for simplicity sake. If your concerned just order it with the 3bar sensor if I remember correctly it wasnt all that much more money.

HMMMM, Question:
1.Since the Microtech uses a internal Map Sensor, is there any lag involved with a 3' long+ sensor line?

2.Does the external MAP sensor yield a better response time?


Thanks for the input
John

I have never experienced nor have i ever heard anyone having any"lag" having the map sensor line that long.It isn't an issue whatsoever
Jon

Thanks

My friends Wolf3d has an internal MAP sensor like the Microtech and I have not witnesed any problems.

one thing to keep in mind is that your MAP sensor is simply a pressure sensor. and to run a hose from the intake DOWN to the PCM means that any extra moisture the intake may bring in, can be built up in that hose. this would definately cause your MAP sensor to give inaccurate readings. and if the MAP sensor is on the inside of the PCM, that would mean if moisture did build up and condense, your simply pouring water into your PCM. maybe its just me, but its not the brightest idea of a setup in the world.

Riiiiiight.

Uh, I think this uselessly alarmist post speaks for itself.

lechnoid, if it really scares you that much, go to your local fish store and buy a small airpump filter. They're little, clear, and filled with silica gel, and will absorb whatever moisture finds its way down into your MAP sensor, mkay? :rolleyes:

Brandon

i'm not saying that it scares me in the slightest, or even that its turning me away from the MT, i'm just saying that its a bad design. if i get this PCM, i fully intend on getting the external MAP to reduce the possibility of failure. don't just assume because you think you know what is the right way, that it is. look at how cars are being built. they have the MAP sensor in the engine bay (usually above the manifold) for the reason that i had listed. once again, i'm not trying to scare anybody, or even convince them to change what they're doing right now or planning on doing. i'm just making people aware of the possibilities that can happen.

lechnoid

i have a MT8 on my ski boat, more water than a car will ever see, standard map sensor and have no problems at all, my orignal MTX8 is over 4 years old and never had a problem with the map sensor, i have a old digi1 that would be 7 odd years old, same internal map sensor and no problems with the with it,

Dale