3.5 Bar N20 MAP Sensor

StuyMac · 05-09-2019, 03:05 AM

Whilst Ive been playing with my meth settings, and JB4, Ive come across the issue where I think I cant increase the JB4s target boost (on map3) as I have maxed out the OEM 2.5 bar sensor.

Ive stacked the JB4 on a custom BEF, and using the JB4 on map 3 ONLY to control meth.

So, my question is; is the 3.5BAR N20 sensor upgrade a simple bolt on? Do you fit the sensor and the max MAP limit is raised, or does the sensor / custom map require calibration?

(I know the JB4 target is below ECU PSI in the graph - log was taken whilst testing before I lifted the target)

harkes · 05-09-2019, 03:48 AM

Need a new custom map if you dont want to use JB4 for boost control. But if you only use JB4 for meth then why not run map0 to avoid JB4 interfeering with the DME operation. (Note: I have been away from JB4 for about a year now so things might have changed).

StuyMac · 05-09-2019, 05:22 AM

The JB4 on Map 3 will increase boost when meth is flowing, meaning that you get the protection of requiring methanol flow before the JB4 will add anymore boost to the BEF.

My issue is that my BEF is maxing out the 2.5bar Map Sensor at 21.4psi, so without more headroom the JB4 cannot add / target anymore boost - I cant target 23psi, for example, on the JB4, as the 2.5 bar map sensor will not read that high, hence why I think I need to change to a 3.5 bar sensor?

In the graph attached my ECU boost flatlines at 21.4psi - actual boost is pobably a little higher, but the 2.5 sensor will not read anymore.

05-09-2019, 03:05 AM	#1
StuyMac Private First Class 61 Rep 156 Posts Drives: F31 335i Join Date: Jul 2015 Location: Wirral iTrader: (0)	3.5 Bar N20 MAP Sensor Whilst Ive been playing with my meth settings, and JB4, Ive come across the issue where I think I cant increase the JB4s target boost (on map3) as I have maxed out the OEM 2.5 bar sensor. Ive stacked the JB4 on a custom BEF, and using the JB4 on map 3 ONLY to control meth. So, my question is; is the 3.5BAR N20 sensor upgrade a simple bolt on? Do you fit the sensor and the max MAP limit is raised, or does the sensor / custom map require calibration? (I know the JB4 target is below ECU PSI in the graph - log was taken whilst testing before I lifted the target) Attached Images
	Appreciate 0 Tweet Quote

05-09-2019, 03:48 AM	#2
harkes Colonel 1078 Rep 2,358 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	Need a new custom map if you dont want to use JB4 for boost control. But if you only use JB4 for meth then why not run map0 to avoid JB4 interfeering with the DME operation. (Note: I have been away from JB4 for about a year now so things might have changed). __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China)
	Appreciate 0 Quote

05-09-2019, 05:22 AM	#3
StuyMac Private First Class 61 Rep 156 Posts Drives: F31 335i Join Date: Jul 2015 Location: Wirral iTrader: (0)	The JB4 on Map 3 will increase boost when meth is flowing, meaning that you get the protection of requiring methanol flow before the JB4 will add anymore boost to the BEF. My issue is that my BEF is maxing out the 2.5bar Map Sensor at 21.4psi, so without more headroom the JB4 cannot add / target anymore boost - I cant target 23psi, for example, on the JB4, as the 2.5 bar map sensor will not read that high, hence why I think I need to change to a 3.5 bar sensor? In the graph attached my ECU boost flatlines at 21.4psi - actual boost is pobably a little higher, but the 2.5 sensor will not read anymore.
	Appreciate 0 Quote