[mike@x-ph.com]

Per Terry

Hey guys,

Due to increasing demand we've finally added 4bar support to the N54 JB4. This allows logging and control of up to 43.5psi. Perfect for those single turbo guys looking to break parts!

We've sourced a Bosch sensor that is fully plug and play and made a PNP harness adapter for a simple direct fit. Each kit includes two orings. A smaller and a larger. We found the larger fits the CPE chargepipe bung better. But other chargepipes may be tighter on the TMAP flange. So we'll just ship them with both orings. In addition we give you an extra 8x32-5/8" long screw to attach the sensor. This is the correct size for the CPE chargepipe. If your chargepipe uses a metric or different size you'll need to source your own 1/4" longer screw to accommodate the sensor.

The 4bar requires the latest JB4 firmware (v126 for single turbo, v32.1 for hybrid turbos) and the latest JB4 interface. Donnie has added support to JB4 Mobile as well in the latest build. To enable you'll set 3.5bar TMAP to 2 as opposed to 1 for the 3.5bar N20 sensor. There is a chance we'll need to modify the IAT voltage tables within the back end flash for proper intake temperature reading although bench testing has shown the sensor appears to use the same intake temp profile as the factory sensor. So we should be good there. We'll need some logs from warmer climates to fully evaluate that aspect and if any back end flash map changes are required for reading intake temperatures we'll post them.

The best news is we were able to buy the sensors in bulk to get the price down. The kit is $99 including the sensor. While it's mainly for large single turbo cars the 4bar can be used with OEM & hybrid turbos, if someone wants the convenience of buying a sensor & adapter harness in one shot. There is not much of a resolution drop between this sensor and the 3.5bar N20.

We'll continue to support both the 3.5bar and this 4bar in all JB4 versions going forward.

[WedgePerformance]

For those using MHD flash or Haltech who want to switch to 4 Bar, here is the information you need.

Special thanks to Jake and Martial for the continued support for flash development.

If anyone is wondering, TMAP sensor scaling has been available for a few weeks now within MHD. So all ROM versions now support sensor scaling for any compatible map sensor.

MHD currently support true boost for N20 3.5 bar and will soon also support true boost for the 4 bar sensor.

[matthewo]

considering a n20 sensor only without the harness is around $100 this seems like a good deal for people even if they do not plan to use it to its full potential as its cheaper...

right?

[Sered]

Yeah, this is pretty much going to obsolete the N20 TMAP upgrade considering the price and its the same amount of work to get it going (very little).

[mike@x-ph.com]

Originally Posted by matthewo

considering a n20 sensor only without the harness is around $100 this seems like a good deal for people even if they do not plan to use it to its full potential as its cheaper...

right?

Correct

[MM Performance]

Pretty sure we are going to find the limits of the stock block with this new sensor and tuning option, I personally don't think the block can take more than around 35-36, but let's find out YEE-HAW! Soon we will new where we will need stronger Pistons, rods, and bolts to hold very high boost levels

[BQTuning]

Im gonna have some fun

[jlcf22]

Ive been out of the loop, so you don't need maxboost anymore to run higher boost with mhd?

[WedgePerformance]

Originally Posted by jlcf22

Ive been out of the loop, so you don't need maxboost anymore to run higher boost with mhd?

No, MHD released logic for all ROM versions a few weeks ago to support scaling within the ROM by setting three breakpoints for the TMAP sensor. This allows scaling within the DME which maintains a smooth analog signal from the TMAP rather than the choppy PMW signal from the MAXBoost hardware. Because we have total control to scale any map sensor, we can support 4 or 5 bar map sensors. Just need to know the sensor specifications so you can set the voltage breakpoints and boost.

[Young_Man]

Is there a DIY for setting up the 4 Bar tmap after install?

[csu87]

Originally Posted by Young_Man

Is there a DIY for setting up the 4 Bar tmap after install?

plug in, update jb4 to latest firmware, set 3.5bar tmap setting to 2

or read the 1st post.