Calibrating 2 bar map in 2 bar speed density?

[pajamasam]

I bought the 2 bar Smartfireinjectors MAP sensor and this is the data i got with it.

Volts PSIa
0.5 -14.7
0.75 -12.83
1 -10.95
1.25 -9.08
1.5 -7.2
1.75 -5.33
2 -3.45
2.25 -1.58
2.5 0.3
2.75 2.18
3 4.05
3.25 5.93
3.5 7.8
3.75 9.68
4 11.55
4.25 13.43
4.5 15.31

They don't give me a 0 volt pressure. I can get the 5 volt one by just adding the linear amount.

Is this going to work for me?

I think i have the wrong numbers because my VE table seems out of wack.

Thanks,
Tim

98 camaro. 76mm turbo Stock engine. 60lb SD injectors.My 1998 Camaro 2 BAR WORKING TUNE 7.4.2014 OPEN LOOP.hpt2 bar.cfgFirst boost.hpl

[mowton]

Not at a computer but with the key on and engine off read the map output using the scanner. Find the atmospheric pressure in your area (elevation) and mess with the gain until you get close.

Ed M

[Russ K]

That's a 1 bar map sensor. As 14.7 psi is atmospheric pressure at sea level.

Russ Kemp

[mowton]

That's a 1 bar map sensor. As 14.7 psi is atmospheric pressure at sea level.

Russ Kemp

Russ, there is a 30 kpa differential. There is a minus sign. It's in vacuum, no? Wouldn't that make it a 2 bar?

Ed M

[pajamasam]

Russ, there is a 30 kpa differential. There is a minus sign. It's in vacuum, no? Wouldn't that make it a 2 bar?

Ed M

You are correct. it goes from -14.7(negative) to 14.7.

Im going to adjust the gain till i get a 100kpa engine off key on. see what happens

[Russ K]

Russ, there is a 30 kpa differential. There is a minus sign. It's in vacuum, no? Wouldn't that make it a 2 bar?

Ed M

Ok now I see the - 14.7!

And to the OP, what is your altitude? As 100 KPA is at sea level. I'm at 94-95 KPA at 1850 ft.

Russ Kemp

[blownbluez06]

I don't recall the MAP sensor ever reading anything with the engine off, key on until I bump the starter once. OP, if you're not reading anything on the scanner for a MAP value, keep that in mind. Once you determine your elevation and compensation amount, turn your key on, with your table set up in the scanner with the 2-bar MAP in it, start the scanner and then bump the starter with the key to view your kPa. You should be close to 100kPa depending on your altitude. Adjust your offset according to how far off you are on your static MAP reading.

[LSxpwrdZ]

Or you can just use the standard SAE MAP PID to log for KOEO scanning. It just wont read anything above ~105kPa.

Those map sensors are chinese and have little to no data but you could start off with the GM data to see how close you are which is 8kPa and 208kPa in the map sensor settings.

[pajamasam]

Or you can just use the standard SAE MAP PID to log for KOEO scanning. It just wont read anything above ~105kPa.

Those map sensors are chinese and have little to no data but you could start off with the GM data to see how close you are which is 8kPa and 208kPa in the map sensor settings.

I was wondering why my MAP pid was reading 0. I will use this SAE one to see how close I am. I am using 8.33 for gain right now.

[DSteck]

Am I the only mother @#$%er who paid attention in algebra? Holy shit.

Linear :: 37.50 psi :: 258.53 kPa
Offset :: -3.75 psi :: -25.89 kPa



I would severely doubt the data they have provided for that sensor though. It looks like the standard GM 2-bar sensor which uses 200kPa/8kPa as the linear/offset values. Their data has an awefully high voltage corresponding to absolute zero pressure.

[pajamasam]

Am I the only mother @#$%er who paid attention in algebra? Holy shit.

Linear :: 37.50 psi :: 258.53 kPa
Offset :: -3.75 psi :: -25.89 kPa



I would severely doubt the data they have provided for that sensor though. It looks like the standard GM 2-bar sensor which uses 200kPa/8kPa as the linear/offset values. Their data has an awefully high voltage corresponding to absolute zero pressure.

Those are the numbers i got also but you can put in negative numbers for the gain...

I need a new map sensor....... it is reading 149 KPA in my logs when my AEM boost gauges which i believe to be correct reads 12 PSI....

149 KPA is equal to 7.1 PSI right?