So I read this thread https://www.s2ki.com/s2000/topic/102...oost-feedback/

It helped somewhat but I'm sure i havent done it correctly, i have a few questions if you would please...

1. WG duty table is just that so 100% allows full boost? and 0% no boost, so should it taper as it gets near the boost i want? if i set it to 100% through all breakpoints why wouldn't that produce best spool time?

2. Boost WG duty max and Boost WG duty minimum should they be 100% and 0%, is that the correct setting the AEM boost solenoid?

3. Boost FB +/- should they really be 49 and -50, should they not be set a smaller values?

4. I believe boost error duty tables has the biggest effect on spool but have a more potent 'thump' when desired boost is reached?

5. Do i alter the boost target compensation to reach my desired boost, if its x psi which is what i want why does that point not appear?

6. How do all 3 tables link together?

7. Does anyone have examples of what the tables should look like?

8. Can anyone briefly tell me how to alter all 3 tables to get best spool time?

I have a GT35R.

Thanks

 

Or, put a bigger spring in your wastegate for the normal amount of boost you run. Fastest spool you can get.

 

Preface: I'm not an expert, but I'm familiar/comfortable using AEM software (Tuner/Pro)

1) Depends on how you have your solenoid wired, but yes; 100% would mean you're 'hiding' (for lack of a better term) the pressure from the wastegate, so it remains closed. If you run 100% duty cycle up to your desired boost level, you'll likely overshoot your target. You should taper the duty cycle such that the wastegate opens at the latest possible moment while still being able to maintain your target.

2) I use 85.2 and 10.2 duty cycle values (max and min, respectively).

3) Boost FB +/- ( I believe the defaults are 0.4 and -.4, respectively) determine how much duty cycle can be taken out of Boost Error Duty from the WB Base Duty table. Meaning, Boost FB +/- needs to reflect the max/min values from the Boost Error Duty. (This is my understanding of the two tables correlation from what I've read).

4) Boost Duty Error works on top of the Base table. If your base table values are solid, you won't require crazy values for Boost Duty Error

5) I don't use the Boost Target Comp table (zeroed out). It really depends how you have your WG Base Duty table configured. Some people like to have the same values in all cells on the WG Base Duty table while using Boost Target Comp to make granular changes.

6) The Boost Target Comp works on top of the WG Base Duty table; the Boost Error Duty works on top of the WG Base Duty table when your predefined boost target values is exceeding (or not reached).

7) This can vary greatly (tuner preference).

8) See post 1


What size wastegate spring are you running? What is your desired boost level? Are you overshooting or not reaching the aforementioned value?

 

Hey thanks for the reply bud.

I have it spooling better now however it seems to ossicilate in boost now, i log show's this and i can feel it.

Any ideas?

Thanjs

 

Post a screenshot of the log.

 

Additionally, can you post your current settings for the aforementioned tables?

 

def the settings. post screen shots

 

This is often true. My Inline Pro stage 1 has a 7 pound spring and runs 19 pounds boost. It's blowing open the wastegate before reaching full boost. And, control is difficult, as temperature and atmospheric conditions have a greater degree of affect on boost target.

 

https://www.s2ki.com/s2000/topic/103...#entry22781302