Now that we have boost logging, direct boost control, and SD, there is quite a bit of interest these days in hooking up a MAP sensor to the factory ECU. The number of different brand MAP sensors that people want use is getting kind of crazy. I'd like to make a few suggestions on which sensor to use for your application.

Overall comment
Pick a MAP sensor that fits the range of boost you anticipate running. The reason is that the narrower the pressure range, the better the resolution. This gives better boost control precision for direct boost control and better IPW precision for SD. All the sensors listed below are about $120.

SD scaling info for all the sensors listed below is here.

JDM 3-bar MAP sensor
Good to 32 psi. Bolt-on replacement for the factory 1-bar MAP sensor on USDM Evos with the stock intake manifold. Compatibility settings and SD scaling have been determined.

OMNI "Universal" 3-bar MAP sensor
Good to 30 psi. Has the same physical geometry as the GM 3-bar MAP sensor, so its good as a universal fit sensor. Faster than the GM and probably the JDM MAP sensor. JDM 3-bar compatibility values will work with this sensor. SD scaling values have been determined.

OMNI Evo 4-bar MAP sensor
Good to 44 psi. Fast sensor. Bolt-on replacement for the factory 1-bar MAP sensor on USDM Evos with the stock intake manifold. Compatibility settings and SD scaling have been determined.

OMNI "Universal" 4-bar MAP sensor
Good to 44 psi. Fast sensor. Has the same physical geometry as the GM 3-bar MAP sensor, so its good as a universal fit sensor. Compatibility settings and SD scaling have been determined.

?? 5-bar MAP sensor ??
Good to 58 psi. The only 5-bar sensor that I know of at this time is the Kavlico. SD scaling has been determined, but compatibility settings for late model USDM Evo 8s and USDM Evo 9s have not been determined. Because it works over a 4 V range, its going to have lower resolution than a 5-bar MAP sensor with a 5 V operating range. Would be great if someone could find a better 5-bar sensor.

 

Awesome thanks! It would be great if the settings/scalings were listed below each sensor to make this the "go-to" thread. I don't currently plan on running more than 32 psi but it would be nice to have...how much precision does the 4 bar sacrifice vs. a 3 bar? Is it only enough to be worth mentioning, or does it significantly affect lower boost tuning control if I use a GM 3 port? Also, is the Omni 3 bar not Plug and Play?

 

IMO the Omni 4 bar bolt on is the best overall unit.

 

I'm planning to add links shortly. :-)

 

Omni also has a 7-bar MAP sensor that is a direct fit available for special order.

 

Is the Omni 4-bar faster than then JDM 3-bar? In real-world conditions would it make any difference on a car running under 30 psi?

 

Hi mrfred.
Can you add in partnumbers for the sensors and connector cap's.

Thanks GiGas

 

What about the zeitronix 3.5 bar sensor? The zeitronix site says it's good to 35.3PSI. I already have one & am planning to do ECU controlled boost & SD. Are there already settings/scalings for this sensor with stock ECU?

 

Any sensor is going to be "fast" enough for boost control and logging.

I think response was actually brought up because there is some question about the sensitivity of the sensor possibly being related to an issue with speed density driveability.

 

I'm happy with the 3.5 bar SSI sensor I am using currently. 4 volt resolution with good signal conditioning and good repeatability even with varying ambient temperature changes. It was developed for automotive use and all the transducers are tested at the factory before it is shipped. Plus it is made in the USA so you know the quality will be good. ~$75 from digikey.

So far I would say it is on par with the 0-5v resolution of the JDM 3 bar MAP sensor I am using in my evo 9. I really can't tell a difference in the logs to tell you the truth.

 

I have had no issues with my Omni 4 Bar.......cept I was one of the lucky ones with an improperly pinned out sensor.