I know the difference between the different bars. 1 is for N/A or one atmosphere (14.7 lbs ), 2 is for two atmospheres (29.4 lbs) etc etc...

But what or how does running a 2 bar vs 3 bar map sensor change your map.
Would there be a difference in the maps if your only running up to 14psi of boost?

Is it safe to say that there is no difference until you go over the 2 bar threshold?

What happens when/if you exceed the 2 bar threshold, will the Haltech go into a defualt map mode?

Can I run a 3BAR map with a 2bar sensor?

 

You will lose fuel map resolution if you are using a 3 bar MAP sensor in a 2 bar application.
This is because you have a given number of adjustments per fuel map.

If you are using a 3 bar MAP sensor in a 2 bar application, the last third of the fuel map page will not have information of value.

If you exceed 2 bars of pressure with a 2 bar MAP Sensor - the sensor will just put out it's maximum value - which will look like 2 bars.

(Actually you might get a little over 2 bars - but not much)

Steve

 

There is a difference in 2bar and 3bar maps (number of data points IIRC).

The haltech needs to be setup for the correct sensor input (bar select) otherwise the scales will be way off.

If it goes over the sensor it would just keep the same output. So on a 2bar sensor, 3bar would read the same as 2bar. Then your computer will calculate fuel for 2bar and not 3bar and that's bad.

 

A much simlified way of answering this would be that, when you have the software setup for 2 bars, the middle point (the point between vaccum and boost) is at the 16th bar and the hight of the range is set at a given hight, when you switch the software to 3 bar mode, the maps stay with the same bar hight as they were with the 2 bar setup, but now, the point between vaccum and boost is around bar 12, and the hight there is different than when you had it on 2 bar mode.

In other words the 2 bar map is worthless in 3 bar mode and viceversa.

I always recommend using the 3 bar map sensor, and just properly tune the car for all conditions, if you dont want to run more than 15psi, DONT! period. Set your boost controller and wastegate so no more boost will come on, and restrain your self from the temptation.

Amen!

 

I believe the Haltech has 32 load "ranges".

1bar MAP sets right most bar as "0" load - everything to the left is vacuum.
2bar MAP sets left half in vacuum - right half in boost, up to 15psi.
3bar MAP sets first 1/3rd in vacuum, right side 2/3rds is boost - up to 30psi of boost.

Changing the MAP sensor type will change the scale of the load points.
Since the load points are defined, the ECU can only change the scale.


-Ted

 

Thx everyone i get it now..

the maps are based on a scale of 32. the only way for the Haltech to comensate is to move zero left or right depending on the type of MAP sensor selected


Ted.... good explaination makes sense