I don't have much experience controlling boost through the ECU, what I need to do with a dual map rom is to decrease max boost level on the base map to around 12-13psi. I'm assuming that I have to adjust the values in 'boost desired engine load' & ' baseline WGDC' tables. Any tips how to do that & what figuers to start with?

The car is an E9 with larger 20G sized turbo.

 

12-13 psi is about 170 load (load offset + desired boost).

what you can do is look at your boost error correction table and deduct from the WGDC table the amount it states in the error correct table to get you to 170 load.

so if you deduct lets say 30 across the board from the desired boost table. and the correction table deducts 10% for 20 load overboost, then reduce the WGDC table by 15% across the board.

then go out and log and fine tune the WGDC table to minimize corrections

hope that makes sense.

cheers

 

You mean to deduct 10% further from the desired boost (+ 30 across the board).
I didn't get what to do in both desired boost & WGDC tables in relation to the error correction table. I hope that you could explain it further based on the actual figures in the correction table :]

 

For your Alt map (12-13psi) boost tuning, zero out the BEC table, tune the desired boost curve in 3rd or 4th gear.
Then once the desired curve is reached, input the load logged minus the Load Adder into the BDEL table for the Alt map.
Then input the saved values for the BEC table back in and fine tune as 07evo said.

 

There are two simple answers here:

1. Read the several threads that talk about tuning boost on the ecu

2. Zero out your WGDC Table since you're wanting barely above WG pressure as it is and call it a day.

Also, what 07EvoIX said is incorrect. You should not tune boost, no matter the level, with the correction factors as it will be more time consuming and less accurate in the end.

 

12-13 psi is pretty much wastegate pressure (assuming stock 12psi spring is installed), so you can pretty much zero out the WGDC and correction maps and be done.

 

not sure why my method is 'incorrect'. iv tuned boost many times like that with no issues. it might not be everyone's prefered way as either will achieve the same result, but it does work.

cheers

 

I think most folks on the board zero out the corrections, get the boost tuned about right, and then only add the correction after the fact might be what he was getting at.

 

^This is the correct way to do it. zero out the error correction then adjust the boost based on the wastgate duty. adjust the desired load or psi tables and offset. then turn back on the error correction.

 

+1 zero error correction tables