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Magneti Marelli Air Temperature Sensor code

5664 Views 11 Replies 8 Participants Last post by  Mart1n, 
egicar
Hi all,

there is anyone that knows the code of the air temperature sensor, please?
I know it is Magneti Marelli, but I need the code, to find the data sheet, cause I'd like to mod this sensor to increase slightly the gas percentage.

Thanks a lot in advance.
Egidio

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egicar
I think you're right. It's the same as the ones used on Moto Guzzi bikes and Fiat cars.

Thanks a lot, Derek!!!
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egicar
So, I palyed with the data and I supposed to increase the stechiometric rate to +5%, to tame the ON/OFF issue and the hiccup at low speed.
To get this result, it could be sufficient to put another NTC with the same features as the stock one in series to the stock one, in the same position, modifying the stock one (Magneti Marelli ATS05).
Here is a file with the data.
What do you think about?

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egicar
We know that the ideal stoichiometric ratio is 14.7 parts of air to 1 of gasoline, but we also know that the engines deliver peak performance at around 13.5/1.
So, if (it is not always the case) the standard carburation is the ideal one at all engine rpm, we should produce a first approximation increasing the stoichiometric ratio by about 7-8%.
Another useful information is that the air density increases with decreasing temperature, by about 3-4% per 10 °C and then to obtain a + 7-8% we can simply simulate a temperature about 20 °C lower than the real one. We could start with a lower increment (+5-6%) to reach the best ratio for our specific engine step by step.
I don't know if the best choice is to connect another stock NTC in series with the stock one. Maybe it could be a better solution to find a new NTC with a higher "beta" value (>= 4200K). I found a very good explanation of this topic here in Italian (you can use google translator).
I'm finding a stock sensor to do some nondestructive experiments :joyous:
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