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Map sensor rating?


insanity007
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2.5 bar means they measure 1.5bar over atmospheric (so 1.5 bar over and above 1bar atmo)..

And you might have read you are only safe to tune up to around 1.2bar (on a 2.5 bar map) to allow for spiking etc, as you exceed the maps limit (1.5 bar), your car will still run most likely with out cutting but your fueling will be all over the shop (and dangerous to motors health) as your ecu will have no idea whats going on.

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 funkytown said:

2.5 bar means they measure 1.5bar over atmospheric (so 1.5 bar over and above 1bar atmo)..

And you might have read you are only safe to tune up to around 1.2bar (on a 2.5 bar map) to allow for spiking etc, as you exceed the maps limit (1.5 bar), your car will still run most likely with out cutting but your fueling will be all over the shop (and dangerous to motors health) as your ecu will have no idea whats going on.

This would make perfect sense except for the fact Subaru MAP sensors are only used for boost control and cut. Subaru ECUs are MAF driven so you have more to worry about exceeding the limits of your MAF sensor (very, very unlikely)

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 funkytown said:

Sorry logic applies for cars running link and similar.

?Does the factory ecu cut when the sensor limit is reached or what happens

The factory ECU has a table that looks kinda like this:

V78NF.png (in this case a modified one taken from my B4's ROM)

Which it uses to determine at what MAP level it should cut fuel to the engine. It does not do so when it reaches the limit of the sensor (thank god)

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Thanks for the replies so far guys. I've chipped my ECU and want to run 18psi and need to know if this is too much for the MAP sensor.

It's currently running 16 psi with the chip and I haven't noticed any spiking whereas it was spiking HEAPS before I chipped it. It would spike up to about 16 and drop back down to 10. Now it hits 16, stays there until about mid 5000's and slowly drops back down to 13 before red line.

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 insanity007 said:

Thanks for the replies so far guys. I've chipped my ECU and want to run 18psi and need to know if this is too much for the MAP sensor.

It's currently running 16 psi with the chip and I haven't noticed any spiking whereas it was spiking HEAPS before I chipped it. It would spike up to about 16 and drop back down to 10. Now it hits 16, stays there until about mid 5000's and slowly drops back down to 13 before red line.

Whether it's safe to run or not is not dependant on the MAP sensor but the tune. If you're going to run 18psi, get a wideband O2 sensor check and also check for knock (not with your ears, with a knock sensor and headphones)

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 Wiretap']

[quote name='funkytown said:

2.5 bar means they measure 1.5bar over atmospheric (so 1.5 bar over and above 1bar atmo)..

And you might have read you are only safe to tune up to around 1.2bar (on a 2.5 bar map) to allow for spiking etc, as you exceed the maps limit (1.5 bar), your car will still run most likely with out cutting but your fueling will be all over the shop (and dangerous to motors health) as your ecu will have no idea whats going on.

/quote]

This would make perfect sense except for the fact Subaru MAP sensors are only used for boost control and cut. Subaru ECUs are MAF driven so you have more to worry about exceeding the limits of your MAF sensor (very, very unlikely)

just to add to that - it does use map sensor if the maf is not running(unplugged or dead etc)

newer ones can be tuned to run on map only like a link

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