I just installed Map sensor with my UTEC
it's T in between the Fuel regulator and the intakemanifold.

seems the reading is not very consistant.
if I turn the key and start the car right up sometimes it will read -18.8 PSI at idle
and if I turn the key to IGNATION and wait 5 seconds than start the car most of the time it will be around -8.4 psi..

and sometimes it reads 0 psi at first disregard if I start the car fast or wait 5 second.
than after 3-5mins it will become -8.4 at idle.

can someone explain why :-(

 

how did you calibrate it?

 

Yes list your values you put in and how you factored them. make sure to include the unit you used as well.

Ben

 

Sounds like its not the sensor, but where you tapped to get your vacuum signal..

FWIW if you have a GM sensor, and fairly short wiring (under 3 feet) the stock calibration on the UTEC should already be close.

 

I'm using the Turbo XS sensor
it's 12 inchs away from the T source
I used Stock calibration. 204
244

I was thinking first it was also where I got the Vacum source.
but I have my boost guage also running off the T and it does not have this problem.

 

im using the turbo xs sensor also, and mine is acting up. the stock calibration is not working for me.

 

BSREVO
where did you T your vacum source ?
what's your calibration.
right now with the stock calibration I'm off by 0.4 PSI
by the way is what was your P0 Value ?

 

my T is off the boost gauge hose. hose is only 6 inches. and my car is reading -45psi during idle.

superman, did you try the equation?

 

yes I have tried the Equation
but seems it's not working for me but I'm going to double check my math again
and retry it

 

just tried to calibrate it again
it's working now
seems I had a Cell like on and after I clear it
it works and is accurate

do you guys have to wait 2 min before you Crank to get the right reading on the MAP sensor ?

 

I noticed mine also shows weird readings sometimes and that's why I switched to gauge display instead of atmo to confirm. Having a boost gauge in kPa doesn't help either. Too many variables and really hard to calibrate on your own. I wish Turbo-XS included both Psi and kPa (or bar) toggle-able switch in the turer settings. Mine is also off by a little on stock calibration #s but in some cases it shows completely weird number and like it's said above I think it depends on how you start the car.

 

SoR
tks for your feed back.

question that comes to my mind now is that how will the close lop boost function
if you start the car too fast. For me it's not possible to always have a Laptop connected to the UTEC and I will not know if the MAP sensor is reading correct or not.

what will happen if the Map sensor reading is at -16 PSI at idel and the true reading is -8 PSI at idle just because you didn't wait 2-3 min to start the car. and I guess I will be out of luck if I use MAP as a Load reference and I will overboost and encounter some serious lean conditions

Anyone's advise is welcome

tks

 

my map is acting really screwy.

here are you numbers.

P0-0
M0-85
P1-5
M1-105

gradient-250
intercept-212

what are you guys using?

 

my is

P0 0
P1 -8.8psi
M0 85
M1 48

gradient 235
intercept 199

BSRevo do you have to wait 2-3 min before you get the right MAP reading off your DATALOGGER 4

 

my psi wont go high -25psi!!!!!!!!!