Hondata

For some reason the PSI readout on the hondata is not the same as the other 2 boost readouts that I have in the car. Mattter of fact it's 3-4psi below at just 10PSI. Im having trouble tuning the car when datalogging with my Zeitronix software because the numbers are so far off. My greddy Spec II, and zeitronix both read 10 psi (which both have their own boost sensor), but the hondata reads 6psi. Im thinking the scalar and offset must be off in the MAP settings. Maybe I'll have to adjust the Offset like what I did with the GM MAP 3bar sensor. I was under the impression that the numbers would be correct since it is a Hondata 4bar. I would appreciate any help! Thanks!

Additional notes:
1) I selected the hondata 4bar in the MAP settings

I was searching on the web and came up with someone having the same problem as me. So which leads me to believe that the scalar and offset has to be off. I'll try adjusting them tomorrow to see if I can get it closer to my other 2 boost readouts.

http://www.hondata.net/forum/viewtopic. ... 02e6dc3d38

Any fix for these issues?

The scalar and offset are correct. Where are you tapping to get all these readings?

Spunkster wrote:The scalar and offset are correct. Where are you tapping to get all these readings?

Im tapping right off of the intake manifold. But my thing is, why am I not the only person this is happening to? We are all having the same exact symptoms. All I can think of is to adjust the offset to get it to work right. Mathematics and actual real time events are 2 different things. I'll just have to tweak and get it right. Hopefully it works out.

I have heard of no one else having any problems. Can you send a datalog showing this and the calibration being used. If have tested the 4bar against a stock Honda map sensor and they read exactly the same.

My guess is you have the settings incorrect in the software for displaying the map values. You may have it set to absolute when it should be set to atmospheric.

Spunkster wrote:I have heard of no one else having any problems. Can you send a datalog showing this and the calibration being used. If have tested the 4bar against a stock Honda map sensor and they read exactly the same.

My guess is you have the settings incorrect in the software for displaying the map values. You may have it set to absolute when it should be set to atmospheric.

In my first post are links to other complaints. The most the MAP sensor registered was 6PSI and I was running wastegate spring pressure which is 10PSI like what my 2 other gauges were showing.

Can you hook the map sensor up to a vacuum pump and see if it will hold a steady vacuum?

No, I do not have a vacuum pump. I wish I did though.

Take it to any autoparts store, they should be able to assist you.

Ok, this is really getting on my nerves. Im hate being upset but I spent all this money on this MAP sensor and it just will not read boost right. Im finding more and more posts on other forums with people with the same problem. Lastnight my car went SUPER lean (17AFRs) because this thing fails to read correct boost. I datalogged with both the S300 and Zeitronix. I have the MAP sensor voltage readout at 9lbs and it says 1.39Volts through the Zeitronix software. Is that right? Doesnt seem accurate to me. What voltage should the MAP sensor read? I have all the datalogs with both software to prove if you need.

The case may be leaking. You need to pressure test the MAP sensor to eliminate this as a cause.

I went back and double check the sensor. The top of the housing seems loose when I push on it. The bottom stays stationary but the top moves a little, I can also see a little gap between the top and bottom. Is that normal?

Without pressure testing it, it is hard to speculate on if it is leaking or not. even if all you do is use some vacuum hose and a syringe, you need to check the sensor for leaks.

Ok, I got the MAP sensor to work. It's kind of hard to explain but here it goes. The metal part where the screws go into was sticking out further than the top cover causing just the top cover to be a little loose. I had to screw the screws in so tight to crush the metal piece down some so that the screws will actually make contact with the top of the cover. So now the MAP sensor is pressed firmly together and seated.
So who ever has this problem, make sure that the top cover is not moving back and forth when you install the sensor.