Sensor page for MembersPage/EricN
I have decided to try using Honda sensor because A, I am a Honda Tech and have an abundance of conectors and sensors laying around, B, I am trying to convince my buddy to convert his CRX over but he isnt confident that it will work. This should help ease him.
TPS - Honda anything, going to try and remote mount the sensor so it is not visible on the throttle body. Will leave the first one on the throttle body when trying to setup the second to make sure they read the same throughout the throttle range.
CLT - Honda Civic,
MAT - Honda Civic,
I have measured most generations of Honda vehicles, they all use the same type of sensor for air and coolant temp, just different mounting styles. They seem to be compatible (when connected to MegaTune, they read the correct ambient temp). I have yet to get the vehicle running yet to confirm any problems.
MAP - This one may be a problem. Havent looked to hard into it but if I set the MAP range in MegaTune to 104 KPA (I assume that is normal for a naturally aspirated engine) megatune only shows 60 kpa (ish). If I set the range to around 160 KPA, I get it right. (I am at sea level). JK: Don't worry to much about the MAP sensor, the VEMS V3 has an internal 2.5bar sensor(1.5bar boost).
To do: Somehow measure sensor range and compare to GM type, see what is different. Maybe just find a GM one and use it, less hassle.
1 concern I noticed that I was concerned about before I started was the map sensor. I am using a Honda map sensor, changing to a different one is an option but I would like to avoid it if possible. The lowest map reading I got when I let the throttle plate shut was around 76 kpa, I kind of expected something lower, is this "normalish" considering how bad it is running etc.?
Ok, hooked up a scanner on a car at work today, realize I am right and I should expect around 30kpa or so at idle. What can I do to configure this MAP sensor to work?
76kPa vs 30kPa is a huge difference. -32kPa is the maximum (negative) offset that can be applied (kpaoffs=00). Try it. Beware that MegaTune cheats you with this, the unit is not mV (for a long time) but kPa. So at least verify with mcd dump.
If you can adjust kpaoffs and kpafac so that MAP reading is close, the remaining error can be corrected with mapping. Actually, mapping can be done even with very incorrect values (if the trend is otherwise OK; the resulting ve might look awful), but good readings are better in general.
I gave up on the Honda map sensor and went with a GM one. Way less hassle, everything works the way it should now. The Honda sensor still read in a linear fashion but I couldnt configure it to swing to readings that I am used to. I thought that was the reason my truck runs like crap, turns out it is not. I can run the truck and disconnect all coils at the same time, except for #1 and the truck doesnt run any different. Connect coils 2-6 and disconnect #1 and the truck dies. The exhaust manifold runners are stone cold except for #1. Compression check is next, see if the motor is still ok.