jonesier1
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| posted on 23/8/09 at 01:02 PM |
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m.a.p sensor in megasquirt
Got my timing problem sorted by removing a complete edis set up from another car and soldering it in,now i have ign advance but watching my tables in
ms why does my ign map and table only move up and down the top row of bins(100kpa).My tps is set and the load gauge moves with it,its set for alpha n
in the constants and cofigurator.
Should my map sensor still need to be connected or blanked off when using alpha n,if i suck on the pipe the map reading lowers as you would expcet but
surley the ign table should move with tps movement. so it seems to me its still reading map not tps ? Not sure just plucking at ideas
im in my own little world...its ok though they know me there
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omega0684
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| posted on 23/8/09 at 01:45 PM |
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if you are running alpha N then you don't need map sensor connected, i just disconnected mine, you only need MAP sensor if you are running Speed
Density
when you suck on the pipe your creating a vacuum and that is why the map sensor reading decreases
what are you running MS 1 or MS 2?
if your running MS1 you need to make sure that you change the scales of the y axis to scale your TPS ADC values
if you are running MS2 you need to calibrate your TPS in the tools tab and then it measures the TPS opening by a percentage.
[Edited on 23/8/09 by omega0684]
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jonesier1
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| posted on 23/8/09 at 03:32 PM |
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i have set my tps up ie current and wot so should my ign map and timing table now alter when i press the throttle because they do as far as rpm but
stay in the far or highest row of bins ?
running ms2 with t/b's
[Edited on 23/8/09 by jonesier1]
im in my own little world...its ok though they know me there
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omega0684
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| posted on 23/8/09 at 03:47 PM |
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when you switch from SD to Alpha N, MS doesn't recalibrate the fuel and spark tables to the TPS scale.
if you are running MS-1,you need to take you minimum TPS ADC value and put that in the lowest box on the y axis of the fuel table & spark table
and the maximum TPS ADC in the top box. Then equally space values between the minimum and maximum values
so if your minimum value is 30 and your maximum is 200 your y axis scale should be something like,
30,35,40,45,50,60,70,90,120,150,175,200
and the same for the spark
am i on the right lines to your problem?
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jonesier1
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| posted on 23/8/09 at 03:59 PM |
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ok i understand that but if i look at the ign table (engine off) the box thats highlighted(green)is the top box on the first row,should it not be the
lowest box and increase when i press the throttle ? the same on the ign map pic its at the far end not the nearest. in using ms2
[Edited on 23/8/09 by jonesier1]
im in my own little world...its ok though they know me there
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omega0684
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| posted on 23/8/09 at 04:19 PM |
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if the engine is off it shouldn't matter where the green highlighted box is as the MS isn't getting a signal from the engine and relevant
sensors. if its doing it when the engine is running then you have a problem somewhere.
if you are using MS2, as i understand it, it uses a percentage of the voltage given from the TPS on the y axis. IIRC the fuel table is a 16x16 table
so you have 100% in the top box and 1% in the bottom box,so i would have some thing like this in the y axis.
1,5,10,15,20,25,30,35,40,45,50,60,70,80,90,100
for the spark table i would have (remember spark table is a 12x12 table)
1,5,10,20,30,40,50,60,70,80,90,100
did you make sure that you clicked 'save' when you changed from SD to Alpha N in the configurator?
at idle the green highlighted box should be down in the botton left corner of the fuel and spark tables
[Edited on 23/8/09 by omega0684]
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jonesier1
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| posted on 23/8/09 at 04:44 PM |
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ok,just been and done that,the ve table is in the bottom left and works as it should but the ign table and ign map are still in the top/far boxes and
only move side to side on that row. i checked and my settings are saved.
im in my own little world...its ok though they know me there
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omega0684
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| posted on 23/8/09 at 04:59 PM |
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well your half way there! 
i don't understand why the spark table should be any different though, if you have set up the % y axis the same and the x axis revs the same
then you should be getting the highlighted green box in the bottom left corner
have you tried recalibrating the TPS?
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jonesier1
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| posted on 23/8/09 at 05:10 PM |
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yep .tried that .making slow progress i guess,very slow,sva retest time is gettin short now  .thanks for your help 
im in my own little world...its ok though they know me there
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