Hi,

Looking to eek a few more hps from my mapping - and want to look at adjusting the fuel pressure in the ECU.

The car has a different fuel rail pressure sensor, 1800bar instead of the stock 1500bar) and so I assume even when the ECU is requesting 1350bar, it will be getting more due to the fact the sensor is incorrect.

I have seen people do this adjustment a couple of ways.

Firstly, I assume we can rescale the rail pressure and rail limiter maps to suit the correct new sensor?

I have heard of people "fudging" the change by adjusting a few bytes which scale this??

Looking for some advice,

Thanks.

James

Hi James,
yes you have to modify the bin. Sensor linearisation has to be chaged to exact specification your new sensor has.

But is not that easy.
There are bunch of single values that has to be changed.

First thing - you probably forgot to change the rail diagnostic limiter - you can not see the actual maximum pressure you are achieving, because the firmware is limiting your diagnostic unit to 1350bar.

The sensor linearisation map is not only one that has to be modified.

Your car will never work proper until you change that linearisation and needed single values.

There is some your post about dyno result. You did not post the rpm for max torque peak and rpm for max hp...graph could be useful for you to finetune it.

probably a stupid question, but how does the linearisation map looks like? is it somewhere between of all the maps in the bin? i mean btw the dw, iq, boost and so on? or i need to look somewhere else?
Thanks in advance