Setting calibration for an AIT sensor?

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Setting calibration for an AIT sensor?

Postby Chris Wilson on Tue Dec 16, 2008 7:14 am

I have a Magnetti Marelli fast reacting intake air temp sensor i want to replace the stock, and slow, Nissan Skyline RB26 one with. How do I set the figures for it in the latest software for an M800? I have the spec sheet for it ( http://www.mmcompsys.com/download_zone/ ... web_01.pdf ) Thanks.
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Re: Setting calibration for an AIT sensor?

Postby RossB on Tue Dec 16, 2008 9:49 am

You can use a custom calibration in your input setup with the following values:
Temp Volts
-40 4.95
-20 4.91
-10 4.72
0 4.53
10 4.28
20 3.95
30 3.54
40 3.08
50 2.60
60 2.14
70 1.73
80 1.38
90 1.09
100 0.83
110 0.65
120 0.45
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Re: Setting calibration for an AIT sensor?

Postby Polux RSV on Tue Mar 31, 2009 11:47 pm

Hi,
I am also installing a Marelli sensor. In the M800 spec sheet, I read that the temperature inputs have 1k pullup resistor and a 100k pulldown resistor. Is this correct ?
The values in your post are calculated without the 100k resistor. If it is present, your values make a significant error at low temperature. You read -30° instead of real -40°.

Angelo
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Re: Setting calibration for an AIT sensor?

Postby RossB on Wed May 06, 2009 1:50 pm

-Yes you are correct the pull down will make a difference at the hich resistance end of the scale. The following values are calculated with the pull down as well:

40 4.90
-30 4.86
-20 4.79
-10 4.72
0 4.49
10 4.25
20 3.92
25 3.72
30 3.51
40 3.06
50 2.58
60 2.13
70 1.73
80 1.37
90 1.09
100 0.83
110 0.65
125 0.45
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Re: Setting calibration for an AIT sensor?

Postby IDP on Sat Feb 27, 2010 5:37 am

Ross,

Could you please explain how these values are calculated?

I have a different sensor I need the values for in M800.

Regards
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Re: Setting calibration for an AIT sensor?

Postby Polux RSV on Sun Feb 28, 2010 8:37 pm

I posted values in your post.
This is basic electronics.
You have your sensor, Rs, connected in parallel with the pull-down 100k, Rd. We can obtain an equivalent resistor Re, with the formula Re= (Rd x Rs) / (Rd + Rs)

Then this resistor is connected to a pull-up resistor, Ru, to 5 volts. This is a voltage divider, and the voltage could be calculated as Vs = 5 x (Re / ( Re + Ru)).

Enter this in excel and you obtain the values in the previous posts.

Angelo
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Re: Setting calibration for an AIT sensor?

Postby IDP on Sun Feb 28, 2010 10:54 pm

Just what I was looking for.

Thank you very much.
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Re: Setting calibration for an AIT sensor?

Postby Wolf_Tm250 on Sun Oct 23, 2016 2:07 am

Chris Wilson wrote:I have a Magnetti Marelli fast reacting intake air temp sensor



Are we talking about the ATS04 Marelli?
Thanks
Wolf_Tm
Toyota Celica GT-four ST205 - full TTE/WRC hardware
Parma - Italy
http://www.youtube.com/user/WolfTm250
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Re: Setting calibration for an AIT sensor?

Postby Rude Engineering on Wed Nov 09, 2016 1:28 am

Yes this calibration is for Marelli ATS04 sensor.
Ross Buckingham
Rude Engineering Ltd. Racing Engine Technology. Hampshire, U.K.
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Re: Setting calibration for an AIT sensor?

Postby Wolf_Tm250 on Wed Nov 09, 2016 6:20 am

Rude Engineering wrote:Yes this calibration is for Marelli ATS04 sensor.


Thanks
Wolf_Tm
Toyota Celica GT-four ST205 - full TTE/WRC hardware
Parma - Italy
http://www.youtube.com/user/WolfTm250
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