I noticed that my current map(inj 1 and inj2) were tuned by using the stock map sensor voltage(not sure why my tuner neglected the greddy map). I would like to use the greddy sensor, however i do know from research that voltage/psi is not the same for both sensors.

Here are some of the equations i have found on S2ki, from mugenrios2k and dsddcd....

Stock Map Sensor
psi=5.395*volts-15.37
or
volts=(psi*15.37)/5.395

Greddy Map Sensor
psi=14.5*volts-21.75
or
volts=(psi+21.75)/14.5

My current plan is to make each column its own independent line(y=mx+b).. and figure out what the appropriate voltage would be for the greddy map sensor.

Does anyone else have a better method?

-thanks in advance

-Lu

 

How is this?

V Stock..........PSIG...................V Greddy
3...................0.8089....................1.55 6
3.25..............2.157725.................1.649
3.5...............3.50655................... 1.742
3.6...............4.04608................... 1.779
3.7...............4.58561................... 1.816
3.8...............5.12514................... 1.853
3.9...............5.66467................... 1.891
4..................6.2042..................... 1.928
4.1...............6.74373................... 1.965
4.2...............7.28326................... 2.002
4.3...............7.82279................... 2.040
4.4...............8.36232................... 2.077
4.5...............8.90185................... 2.114
4.7...............9.98091................... 2.188
4.8...............10.52044................. 2.226
5..................11.5995................... 2.300


Greddy V vs Press
V.....................PSIG
0.5..................-14.5
0.7..................-11.6
0.9..................-8.7
1.1..................-5.8
1.3..................-2.9
1.5..................0
1.7..................2.9
1.9..................5.8
2.1..................8.7
2.3..................11.6
2.5..................14.5
2.7..................17.4
2.9..................20.3
3.1..................23.2
3.3..................26.1
3.5..................29

 

thats the same #'s i got.

the EMU will not let me use values like...
1.64....

they have to be in .05 increments...

 

You have to round to the closest number, you can always do it automaticlly with the =Round() function in Excel

 

sooo...

this is what i would input?

Sotck volts PSIG.... V Greddy Input value
3.............. 0.8089...... 1.556....... 1.55
3.25......... 2.157725.. 1.649....... 1.65
3.5........... 3.50655.... 1.742....... 1.75
3.6........... 4.04608.... 1.779....... 1.75
3.7........... 4.58561.... 1.816....... 1.8
3.8........... 5.12514.... 1.853....... 1.5
3.9........... 5.66467.... 1.891....... 1.9
4.............. 6.2042...... 1.928....... 1.9
4.1........... 6.74373.... 1.965....... 1.95
4.2........... 7.28326.... 2.002....... 2
4.3........... 7.82279.... 2.04......... 2.05
4.4........... 8.36232.... 2.077....... 2.5
4.5........... 8.90185.... 2.114....... 2.1
4.7........... 9.98091.... 2.188....... 2.15
4.8........... 10.52044.. 2.226....... 2.2
5.............. 11.5995.... 2.3........... 2.25


this doesnt make sense to me as there will we 2 rows that will have duplicate values.

sorry to bother you. I just want to make sure i do this right.

BTW the tuner used the same stock voltage values.

 

At 3.7 volts Stock you should use 1.85 V Greddy

Notice you loose resolution with a larger span sensor, which is a downside that most don't understand.

 

I was just about to say that...

4 volts should also be 1.95
4.4 should be 2.10
4.7 should be 2.2

Luis who taught you math? LOL

 

wasnt sure if i was suppose to round down or up

 

Sotck volts PSIG.... V Greddy Input value
3.............. 0.8089...... 1.556....... 1.55
3.25......... 2.157725.. 1.649....... 1.65
3.5........... 3.50655.... 1.742....... 1.75
3.6........... 4.04608.... 1.779....... 1.75
3.7........... 4.58561.... 1.816....... 1.85
3.8........... 5.12514.... 1.853....... 1.85
3.9........... 5.66467.... 1.891....... 1.9
4.............. 6.2042...... 1.928....... 1.95
4.1........... 6.74373.... 1.965....... 1.95
4.2........... 7.28326.... 2.002....... 2
4.3........... 7.82279.... 2.04......... 2.05
4.4........... 8.36232.... 2.077....... 2.1
4.5........... 8.90185.... 2.114....... 2.1
4.7........... 9.98091.... 2.188....... 2.2
4.8........... 10.52044.. 2.226....... 2.2
5.............. 11.5995.... 2.3........... 2.25

So the duplicate values wont matter.... let me upload my map