I am seeing 6-7 psi on the utec and 8-9 on the gauge.

 

What gauge? What sensor on the Utec? One of the two is bad, the only way to check is take it to a shop that has an extra gauge to hook up with and verify.

 

Autometer gauge. I am pretty sure its the utec because I am running the 3.12 pulley on the vortech which would be about 9 psi.

 

where do you have the boost reading off of? if they're tapped off of 2 different places, that could be why there's a difference.

 

Nope. Both tapped from the same source. I think the map calibration is off.

 

You do not want to T off the map sensor. When I had that utec and map sensor it read .1 higher then my blitz boost controller. You need to calibrate the sensor. I have extra holes that I drilled in my upper plenum just for the map and the boost gauge.

 

mine are t-d and read the same. ^^.1 psi difference? gimme a break.

unless you have a mechanical boost gauge, which gauge are you going to calibrate from?
boost is not just dependent on pulley size. you could lose or gain 2-4 psi based on the rest of your intake/exhaust path

in reality it doesnt matter as your car is tuned off the MAP sensor.

 

check your utec pressure reading with the engine off. what does it read? it should be pretty close to 0 (at sea level)......unless you live at high altitudes and then, it'll read below 0. oops...just saw you are in Austin.,.......it should be pretty close to 0.

I think the stock UTEC gradient and Intercept # are 112 and 169 (or the other way around.) your map sensor should have come with a calibration card, too. most people leave the stock gradient and intercept values. if your readings are way off, you may want to calcualte your actual gradient and intercept numbers from the values on you calibration card.

 

Could also have a small tear in the vacuum line going to the map sensor.


Redo the vacuum lines.

 

yep

 

u need the card to calibrate the map sensor ? i bought a used UTEC and it came with no card....

 

to truly calculate the G&I for your map sensor, you would need the info from the cal card. don't worry though. just use the stock 112 and 169 values.....and then look elsewhere if there is a problem.