Afternoon All,

Currently mid mapping my car, my tuner is a remote mapper so we've been doing it in stages. So far I've had no issues of overboosting or any issue other then plumbing up the lines for the boost controller incorrectly which was a brain fart moment as i did the same with my last build.

For specs I have the following.
Kraken Top mount manifiold with a 3" downpipe
A Garrett T25 W/ Hybrid core W/ 10 psi spring mounted
540CC bosch EV14 injectors
Audi R8 COPs
Genuine Mac 3 port boost controller
ME221 Gen 2 ECU
AEM X series wideband

Basically in the last 2 maps in anything over 3rd gear at 100% throttle its building to high revs and then just does a massive overboost for a split second and then comes back and goes again.
I reverted to one of the previous maps and I can get through all the gears fine but theres not as much boost. My tuner has said he things its an actuator or something similar, I have checked the actuator and its not sticking or getting stuck.
I'm unsure what else to check.

Thanks for reading and thanks for any assistance or suggestions.


edit - attached no overboost and overboost logs - 11:43 is map 4 with no overboost - map 6 is with overboost 11:16

 

Post a log of it overboosting and the tune where it over boosts.

Bonus points if you post the old tune where it doesn't overboost

 

I have all of that, but they are too large to upload, the calibration file is 1Mb which is fine but both the non overboosting and overboosting files are over 20mb

 

If you compress it into a zip file it might fit, or upload them on separate posts. You could likely trim the logs down to the important sections

 

https://drive.google.com/file/d/13HP...w?usp=drivesdk

try this.

to add, my tuner has said it’s not boost creeping it’s overshooting.

 

Yeah, I'm not surprised. The boost control is setup so the boost controller doesn't start working until 160 KPA. In one of those logs there's about 0.2 seconds between 160 and 205 KPA when you hit boost cut. You can see the map start to drop ar





Personally I don't have experience on ME ECU's but it also looks like the initial duty cycle table for the CL boost control is completely untuned, but the setting is checked to use that table. I'd kinda expect the Y axis to be target MAP and not TPS, but again I'm not sure how ME does these tables compared to others.






IMO, enabled boost control earlier and get that initial value table tuned. Instead of spooling at 50 (looks like that was lowered to 47 after that log) maybe try 40. I doubt that will be perfect but it should at least give the closed loop time to figure out what's going on.

*I am not a pro tuner, so take it with a grain of salt

 

Seems to me that the Inactive Duty should be 0. Your controller is being held at 50% duty all the time off control, then a drop to 47% duty above 160kPa. Not only will that make it over-spool with your other settings as SimBa pointed out, but your valve is probably clicking away even at idle and won’t have a long life.

 

I can see a non-zero inactive to help spool up, but yeah, no point around idle/ cruise. I enable my boost controller at 50 kPa which is probably a bit lower than I need, but I like to get the turbo spooled up pretty aggressively.

I didn't capture it in that screenshot but in second gear it dropped from 50% duty to around 43% duty, fell well below the boost target and slowly started ramping duty in, so I'd say it's just poorly tuned base settings and likely poorly or untuned PID as well.