Thread: Boost by gear/ boost controller setup questions.

Initial duty.Does this percentage represent the waste gate pressure plus the initial duty percentage? Example: 12psi (waste gate)+ 10% Initial Duty?

Fixed duty, High and low.

Is the low duty setting % less than waste gate pressure, and high duty % plus waste gate pressure?

Boost by gears low boost and high boost tables. Are these values represented as percentage or psi?

Wastegate pressure is 0-10% duty cycle .. normally these mac valves will not increase boost pressure until you get into the 15-20% duty cycle range of the solenoid.

You can NEVER go less than your wastegate spring .. low and high duty just allow you to have a low boost and a high boost setting that you can switch with the high boost switched input.

All table are represented in % NOT psi.

The easiest way to setup your boost control is to start low and work you work up using the Low fixed duty parameter.

So start around 15% fixed low duty and see what your boost level is. Then increase to 20% fixed low duty and see what your boost level is, and so on until you are at your target boost pressure.

Then you can take the percentage that it took you to reach your highest boost pressure and populate the low and high boost by gear tables. If you want to run lower boost in lower gears, you simply subtract whatever percentage you need to reach your desired pressure per gear.

I suggest that you check out the boost control in the help section for more details.

Oh ok, that makes sense. See, now I did look at the help section. I just needed someone smarter than I to elaborate. Thank you much.

So on a SR20DE ECU the only output for this is PIN 102 AIV Solenoid? No need to select anything in the software?

Correct.



You still need to enable boost control on the EBC SETUP screen.

I'm going to piggyback this thread, I'm running boost by gear and love it! My issue now is I'm using a 2002 spec v 6spd with 4.4 final drive and my gear to speed ratio is no longer oem. I have noticed that my Nemu thinks I'm still in a lower gear well into the next gear.
Example: 2nd gear I have my boost set to around 7psi for traction and in 3rd 12psi. Now when I go from 2nd to 3rd I only get 7psi for the first 1/3-1/2 of the gear. I know I can adjust for this by moving my values around but the car ends up out of sync with what I want. Keeping the boost low in the lower gears is key to traction on the street.
Is it possible to add a calibration function to boost by gear? Or should I work with high boost vs low boost to control this better? I'm ok with a work around so any input would be great. Thanks.

On the "SETUP" tab, "EXTRAS", "DIAGNOSTICS" screen, you can adjust the "GEAR CALC FACTOR". Also make sure "GEAR CALC MAX GEAR is set to 6. 6th gear will use the 5th gear table values.

Cheers,
Dave

Your my hero. I didn't even know this was possible. Thanks you guys rock.

I should have noticed this lol I have read over the help section a ton of times. I corrected this and now I'm good thanks again.

On the boost controller note, is anyone getting boost creep? I don't get it while running just off the wastegate but when using the EBC with Nemu I get creep as rpms increase.
EBC settings:
31hz
Act. At 1000rpms
Act. At 534mbar
Int duty. 10%
On low boost only

It shouldn't creep with the boost controller set at such low duty cycle, but it is fairly common for it to run a little higher boost pressure with a boost controller in line.

How much creep are you getting?