Map shows 122 kpa when the engine is off - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-01-2011, 04:31 PM   #21
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Yes under engine constants is reads 400, and it has been since I upgraded from the 250 that came with the MS. It also list the 400 in the configurator. I also have extra sensor on x7 listed in the Baro settings. I have not checked the Baro gauge against the Map gauge, but I will do that when I get off work this afternoon.

To answer Joe's earlier question the voltage is 1.254

The engine map was listed as 109kpa, I will check the baro sensor when I get home tonight.

Last edited by apariah; 11-01-2011 at 05:12 PM.
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Old 11-01-2011, 06:22 PM   #22
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per the graph Joe provided this looks accurate for the voltage. But based on the pressure here in Plano it should be closer too 101.4. is this amount of fluctuation within spec. todays baron out side was 29.96, and my car is just sitting in the garage. I can't imagine the pressure would be that different.
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Old 11-02-2011, 03:35 AM   #23
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The MAP Sensor Gauge and Baro Gauge both match.
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Old 11-04-2011, 11:09 AM   #24
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I started the car this morning, and I'm seeing 109 kpa at idle. I saw 114 kpa before starting the car. Both the Map Gauge and Barometer Gauge seem in sync although the Barometer Gauge fluctuates a bit.

I'm lost as to what action to take next. It seems like maybe the Map sensor could have gone bad, but I'm not 100% positive of any of this.
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Old 11-04-2011, 11:57 AM   #25
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not if both the sensors are outputting the same value. still sounds like a calibration error.
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Old 11-04-2011, 03:24 PM   #26
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not if both the sensors are outputting the same value. still sounds like a calibration error.
Do you have any idea where the bad settings or misconfiguration could be. I sent DIY screen shots of my configurator settings, but I have not heard back yet. If the configurator is correct, the voltage is within specs, the Constants are correct, and the Barometric settings are ok where could the issue be. I can't find any other places where the problem could be located.

Any suggestions on maybe just doing a clean install. I've done it already, but I will happily do it again if that might help.

Other than the settings.ini file can I specify the settings the MS uses then verify its using those specific settings without using megatune or tuner studio.
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Old 11-06-2011, 06:42 PM   #27
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After trying everything suggested here and the suggestions from Matt and Ben I was ready to kick the car when I thought wow the map and baro are in sync when the engine isoff what happens when I start it. Again they stayed in sync at idle, so I reved the engine, and the Map didn't move but the engine vac gauge did. I thought what about that other nipple on the map sensor, so I swapped them and all of a sudden my map dropped from atmosphere (near atmosphere) to around 50kpa. That made me wonder about the tune so I started a new tune based on the original base map, and so foar its idle is much better. I haven't driven it yet since I have to put the MS back together, go to Denton, swing by the office and then do home work. Is it ok to use the other nipple, I thought I had been using he correct one all a long, but now I wonder if I made a mistake,
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Old 11-06-2011, 06:45 PM   #28
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intersting.
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Old 11-06-2011, 06:57 PM   #29
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Post a clear picture showing how you installed the mapdaddy to the MegaSquirt.
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Old 11-06-2011, 07:00 PM   #30
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Quote:
Originally Posted by apariah View Post
I thought what about that other nipple on the map sensor, (...) Is it ok to use the other nipple,
TO be sure I understand you correctly, when you refer to there being two nipples on "the map sensor", I assume that what you are calling "the map sensor" is the green daughterboard which is picture standing upright from the main board in post #18 of this thread?

If so, you should know that that board actually contains two separate MAP sensors. (Each of the two little black squares is one sensor.) One of them is the "main" MAP sensor, and the other is the sensor used for barometric pressure reading. So it sounds like you have had engine vacuum connected to the barometric pressure sensor this whole time?
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Old 11-06-2011, 11:41 PM   #31
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You do understand correctly, however vacuum has been in the same place the whole time until I changed it today. I understand the Map Daddy has two sensors, and thats the kicker. I just changed it, today. I've had the map daddy in place since May or so. So unless someone is playing a pretty nasty joke somethings up.


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TO be sure I understand you correctly, when you refer to there being two nipples on "the map sensor", I assume that what you are calling "the map sensor" is the green daughterboard which is picture standing upright from the main board in post #18 of this thread?

If so, you should know that that board actually contains two separate MAP sensors. (Each of the two little black squares is one sensor.) One of them is the "main" MAP sensor, and the other is the sensor used for barometric pressure reading. So it sounds like you have had engine vacuum connected to the barometric pressure sensor this whole time?
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Old 11-06-2011, 11:46 PM   #32
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I'll post photos tonight when I get back to the garage.

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Post a clear picture showing how you installed the mapdaddy to the MegaSquirt.
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Old 11-07-2011, 01:52 AM   #33
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People on the adaptronic forum were having this kind of problem when the lower limit was set too high so it would read much higher than it really is. I dont know if MS has similar calibration settings.
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Old 11-07-2011, 12:38 PM   #34
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I was sure when I first setup the MS I thought I had to put in the Map as read by the gauge for calibration, but I can't find any documentation on it any where, and no one else has mentioned doing it.

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People on the adaptronic forum were having this kind of problem when the lower limit was set too high so it would read much higher than it really is. I dont know if MS has similar calibration settings.
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Old 11-07-2011, 12:42 PM   #35
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The baro limits should be set to 90-110kPa or so.
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Old 11-07-2011, 12:44 PM   #36
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This is how the Map Daddy is currently connected.











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Post a clear picture showing how you installed the mapdaddy to the MegaSquirt.
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Map shows 122 kpa when the engine is off-4barmap1.jpg  
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Old 11-07-2011, 04:20 PM   #37
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That is the correct sensor for engine MAP.
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Old 11-07-2011, 05:42 PM   #38
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I understand but that's not the one I was using. I was amazed how smoothly it fit into the case I was using the other sensor the whole time and for the most part it ran well. I was able to give my buell a break and drive to the miata to work. with the exception of working on the fine all seems well. I will try and leave it this way utill it goes in for the sawp at the endorse the year.
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Old 11-08-2011, 02:29 AM   #39
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Sorry for the threadjack, but where might one source one of the threaded vacuum nipples as seen in this photo: http://www.ntxbmx.com/lilred/4barmap4.jpg I am assuming that it is a barb on each side with a short threaded body in the middle, right? My searches thusfar have not been very effective. :(

I know I can get it as part of the MapDaddy kit, but is it offered by itself somewhere?
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Old 11-08-2011, 11:14 AM   #40
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Quote:
Originally Posted by jnshk View Post
Sorry for the threadjack, but where might one source one of the threaded vacuum nipples as seen in this photo: http://www.ntxbmx.com/lilred/4barmap4.jpg I am assuming that it is a barb on each side with a short threaded body in the middle, right? My searches thusfar have not been very effective. :(

I know I can get it as part of the MapDaddy kit, but is it offered by itself somewhere?
Yes, we've got it in our Service Parts section.

http://www.diyautotune.com/catalog/b...ing-p-396.html
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