Stock Map Sensor Rating

[jjkerr626]

Hi, I am having the Innovate Supercharger installed on my car and the tuner offered to sell me a 2.5 bar map sensor. I am only running max 12psi so do I need this or will the stock sensor do? Thank you.

[mikalem]

Innercooled or no? There was some problems with the MAP signal breaking up past 4000 rpm on inner cooled setups, along with other oddities. http://www.ft86club.com/forums/showthread.php?t=40066

I originally started with a 4bar sensor, but ended up flipping back after discussion with two different tuners. I'd recommend reading through that thread for more info.

[jjkerr626]

No my setup is not inter cooled, it does have the Raceseng 70mm pulley. What do you think? Thanks.

[nelsmar]

Originally Posted by mikalem

Innercooled or no? There was some problems with the MAP signal breaking up past 4000 rpm on inner cooled setups, along with other oddities. http://www.ft86club.com/forums/showthread.php?t=40066

I originally started with a 4bar sensor, but ended up flipping back after discussion with two different tuners. I'd recommend reading through that thread for more info.

Any links to actual references. That thread is over 100 pages.

And to the op it depends on your tuner. The map sensor is used to offset injector compensation for manifold pressure but there are other ways of doing things. Just depends on what your tuner is doing.

[350matt]

I think the stock sensor is a 2Bar unit so nominally works at 1Bar on the NA engine so ostensibly you can read a bar of boost (14.7 psi)

however in reality the sensor will probably start to clip the signal before this and become non linear at the top end as these sensors aren't meant for boost pressure

I'd fit the Omni item as thats a direct replacement and a 3bar item

[nelsmar]

Originally Posted by 350matt

I think the stock sensor is a 2Bar unit so nominally works at 1Bar on the NA engine so ostensibly you can read a bar of boost (14.7 psi)

however in reality the sensor will probably start to clip the signal before this and become non linear at the top end as these sensors aren't meant for boost pressure

I'd fit the Omni item as thats a direct replacement and a 3bar item

Oem is 1.67 iirc.

[mikalem]

Originally Posted by nelsmar

Any links to actual references. That thread is over 100 pages.

And to the op it depends on your tuner. The map sensor is used to offset injector compensation for manifold pressure but there are other ways of doing things. Just depends on what your tuner is doing.

Sorry about that, but if memory serves it was moto-mike and group that was having the problem with the sensors inner-cooled: http://www.ft86club.com/forums/showt...40066&page=178

There's also reasoning in that thread from other tuners: http://www.ft86club.com/forums/showp...postcount=4096

It's a long thread but there is a ton of info in there about the system and all of it's potential configurations - I highly recommend reading through it.

[nelsmar]

Originally Posted by mikalem

Sorry about that, but if memory serves it was moto-mike and group that was having the problem with the sensors inner-cooled: http://www.ft86club.com/forums/showt...40066&page=178

There's also reasoning in that thread from other tuners: http://www.ft86club.com/forums/showp...postcount=4096

It's a long thread but there is a ton of info in there about the system and all of it's potential configurations - I highly recommend reading through it.

Thanks I appreciate it! I heard about issues but I haven't seen the actual posts. I have read through some of it but really 100+ pages is really something that is hard to casually read up on LOL!

[350matt]

1.67 Bar only?

blimey that needs changing right off then

[Kodename47]

Originally Posted by 350matt

1.67 Bar only?

blimey that needs changing right off then

Why? The OEM sensor runs the car fine on the Sprintex kit. It's not like a turbo where boost measurement is required. The only thing you lack is a boost reading from the OBD port above the sensor's range.

[350matt]

Hmmm
Ok if you're running the car in MAF centered mode then yes the OEM MAP sensor will be fine as its not used for the primary calibration

however this means each cal for this configuration will need the MAF meter scaling quite a lot and may possibly clip its output at higher airflow / power levels

the industry standard is usually to run the MAF as the secondary sensor with the MAP sensor as the primary
ie running the engine in speed density mode

hence my comment of requiring a new MAP sensor with an appropriate sensor range