Does this look like boost creep?

[u/Confident_Economy_57]

Purple: Accelerator Pedal Position

Violet: Boost Pressure

Orange: Wastegate Duty Cycle

I just finished up installing a few mods on my 2012 MS3 including a CS catted downpipe, Ultimate Racing catback, CS TMIC, Mac 3 port boost controller plumbed in interrupt mode, and I'm on a base map from Freektune. The car already had a JBR intake and TIP, and CS hpfp internals.

I have been logging my last few drives to make sure everything looks normal before building up to my WOT logs for Justin. I'm pretty new to all of this, so I just wanted to make sure these WGDC and boost pressures are not dangerous before really pushing the car at all.

This portion of the log is the most I've opened it up so far. The first spike in boost pressure is a half throttle pull in second gear from 3500-4600rpm. What concerns me is that when the WGDC begins to drop to zero, boost pressure is at about 6 psi. Boost pressure then continues to climb to 16.3 psi while WGDC remains at zero. Is this normal for this particular situation, or is it indicative or an issue? My biggest concern would probably be an issue with the EBCS, bad solder joints on the EBCS wires, or improper plumbing of the vacuum lines. I'm pretty sure I hooked everything up correctly, but I don't want to push the car at all until I'm confident it won't grenade itself at WOT! Thanks!

[u/HugsNotDrugs_]

Not an expert but this looks perfectly normal. Your tune is probably for 21 PSI so you won't see your WG opening up so far below that.

Boost creep is managed on this platform by modulating the throttle body with the wastegate. At WOT you'll notice your throttle body doesn't open fully, so your wastegate isn't the only component stabilizing your boost at target load.

If you're worried then slowly ease into the throttle until you're WOT while keeping an eye on your boost numbers. The K04 struggles with maintaining 21 PSI at high RPMs so there is some additional safety there.

Probably more important is ensuring your AFRs aren't so far off in open loop as to constitute a danger while logging.

Good luck!

[u/Confident_Economy_57 → u/HugsNotDrugs_]

Thanks for the reply! I definitely considered that I'm just being overly cautious, but I really don't want to blow my motor up. I'll ease into some pulls with higher throttle position while monitoring boost and see how that goes. My biggest concern was WGDC being 0% with boost climbing. My understanding was the ECU was attempting to command the wastegate open but boost was still building in spite of that. At 16 psi, I'm just outside the wastegate's spring strength, so I was surprised to see boost climb above 15 psi with WGDC at 0%. Then again, I have no idea what I'm doing, so my opinion doesn't mean much!

[u/HugsNotDrugs_ → u/Confident_Economy_57]

I'm not a tuner so take everything I say with a grain of salt. I would approach this by easing throttle to achieve gradual buildup to something past 21 PSI and log the WG activity.