Whats the difference?
Whats the difference?
04-11-2013, 05:31 PM
#2
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MAP stands for Manifold Absolute Pressure. So it measures the air pressure in the intake manifold. The difference between the 2 bar and 3 bar MAP sensor is exactly as the name states. The 2 bar MAP sensor can measure up to a maximum of 2 bar of pressure difference (about 29.0psi or 200 kPa). The 3 bar MAP sensor can measure up to a maximum of 3 bar of pressure difference (about 43.5psi or 300 kPa).
04-11-2013, 05:33 PM
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MAP stands for Mass Air Pressure. So it measures the air pressure in the intake. The difference between the 2 bar and 3 bar MAP sensor is exactly as the name states. The 2 bar MAP sensor can measure up to a maximum of 2 bar of pressure difference (about 29.0psi or 200 kPa). The 3 bar MAP sensor can measure up to a maximum of 3 bar of pressure difference (about 43.5psi or 300 kPa).
04-11-2013, 05:45 PM
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MAP stands for Manifold Absolute Pressure. So it measures the air pressure in the intake manifold. The difference between the 2 bar and 3 bar MAP sensor is exactly as the name states. The 2 bar MAP sensor can measure up to a maximum of 2 bar of pressure difference (about 29.0psi or 200 kPa). The 3 bar MAP sensor can measure up to a maximum of 3 bar of pressure difference (about 43.5psi or 300 kPa).
Keep in mind the values stated above represent the total difference in pressure the sensor can measure. Usually, they are calibrated to measure the pressure difference above and below the absolute pressure (absolute pressure is the atmospheric pressure at the time of the reading). Typically, 1 bar MAP sensors are used on NA (naturally aspirated) vehicles as the pressure differences are relatively low. 2 bar MAP Sensors are used on forced induction vehicles (Turbocharged & Supercharged) and can measure up to 14.7psi boost from the turbo/supercharger. 3 bar MAP sensors can measure up to 29.7psi boost from the turbo/supercharger.
Last edited by snoftall; 04-11-2013 at 05:55 PM. Reason: added more details
04-14-2013, 07:59 PM
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04-15-2013, 09:17 AM
#11
I scaled a le5 pcm to work like this so i don't see y it worldnt work.
But its beyond my tuning ability.
Im gona try and use a maf tube and small air filter with my 1900 If it all fits
04-15-2013, 04:25 PM
#14
The PCM sees "x" voltage from the sensor. Both a 2bar and 3bar send the same voltage at their max pressure. So you put in a 3bar, multiply VE table by 0.6666, and tune.
Pressure is irrelevant.
Pressure is irrelevant.
04-15-2013, 04:33 PM
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So if this is true what am I going to see differently in the car? performance wise..?
04-15-2013, 08:27 PM
#19
John it's not that difficult. The tuning would be a nightmare, everything pressure related would have to be scaled, but it can be done. It's a simple voltage signal.
A 0-5 output 2bar sensor will send 0v at 0bar and 5v at 2bar.
3bar sensor is still 0v at 0bar, and 5v at 3bar.
So since your PCM sees the same 0-5 signal, you're just fitting a 3bar range into a 2bar table. None of the values would be right, but with scaling it would work. It's been done lots of times on other platforms. And is similar to the gms1 lnf upgrade.
The main problem, that hasn't even been mentioned here, is that the VE table doesn't have enough rpm range to do this for a full high boost speed-density tune.
So it's irrelevant.
A 0-5 output 2bar sensor will send 0v at 0bar and 5v at 2bar.
3bar sensor is still 0v at 0bar, and 5v at 3bar.
So since your PCM sees the same 0-5 signal, you're just fitting a 3bar range into a 2bar table. None of the values would be right, but with scaling it would work. It's been done lots of times on other platforms. And is similar to the gms1 lnf upgrade.
The main problem, that hasn't even been mentioned here, is that the VE table doesn't have enough rpm range to do this for a full high boost speed-density tune.
So it's irrelevant.
04-16-2013, 09:42 AM
#22
John it's not that difficult. The tuning would be a nightmare, everything pressure related would have to be scaled, but it can be done. It's a simple voltage signal.
A 0-5 output 2bar sensor will send 0v at 0bar and 5v at 2bar.
3bar sensor is still 0v at 0bar, and 5v at 3bar.
So since your PCM sees the same 0-5 signal, you're just fitting a 3bar range into a 2bar table. None of the values would be right, but with scaling it would work. It's been done lots of times on other platforms. And is similar to the gms1 lnf upgrade.
The main problem, that hasn't even been mentioned here, is that the VE table doesn't have enough rpm range to do this for a full high boost speed-density tune.
So it's irrelevant.
A 0-5 output 2bar sensor will send 0v at 0bar and 5v at 2bar.
3bar sensor is still 0v at 0bar, and 5v at 3bar.
So since your PCM sees the same 0-5 signal, you're just fitting a 3bar range into a 2bar table. None of the values would be right, but with scaling it would work. It's been done lots of times on other platforms. And is similar to the gms1 lnf upgrade.
The main problem, that hasn't even been mentioned here, is that the VE table doesn't have enough rpm range to do this for a full high boost speed-density tune.
So it's irrelevant.
Last edited by mrbelvedere; 04-16-2013 at 09:50 AM.
04-16-2013, 11:00 AM
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So is there a way of knowing your MAP is bad by performance of the car? or jsut engine light throwing.. I am confused on how I know. I guess signs, and symptoms..
04-16-2013, 01:22 PM
#25
A 3 bar sensor at its max output voltage will be in the top of the table just like a 2bar. Stop thinking in pressure and think electrically, which is what the PCM uses.
ANYWAY, it's completely irrelevant since our VE doesn't have the rpm range to make it work.
Just please stop saying "you're wrong you're wrong you're wrong" when you don't even understand what I'm saying.
I know what you are thinking. And you're stuck on the fact that the VE table in hpt stops at 2bar. That doesn't matter.
But I'm obviously not explaining it in a way that you can understand so just drop it.
As I said its pointless anyway.