[bpdef29]

My boost target was always lumpy in my logs and the actual boost was always a couple psi below that curve. Now, with downpipes, the boost curve is flat, but I am overboosting by a lot and don't want to hurt the car. It then seems to correct itself as I shift into 4th. I made sure the vbands were clear of the wastegate arms, why would this be? Running Roc Euro DCI, MHD, VRSF downpipes.

Original:
http://datazap.me/u/bdefiori/vac-lin...=0&data=2-4-21

After downpipes:
http://datazap.me/u/bdefiori/downpip...=0&data=2-4-21

Any help is much appreciated

[WedgePerformance]

Originally Posted by bpdef29

My boost target was always lumpy in my logs and the actual boost was always a couple psi below that curve. Now, with downpipes, the boost curve is flat, but I am overboosting by a lot and don't want to hurt the car. It then seems to correct itself as I shift into 4th. I made sure the vbands were clear of the wastegate arms, why would this be? Running Roc Euro DCI, MHD, VRSF downpipes.

Original:
http://datazap.me/u/bdefiori/vac-lin...=0&data=2-4-21

After downpipes:
http://datazap.me/u/bdefiori/downpip...=0&data=2-4-21

Any help is much appreciated

Unless you have Stage 2+ turbos, you have a WG stuck. Get back in there and make sure you can move your actuators. Throw vacuum on them and watch them move.

[j1gilles]

Originally Posted by WedgePerformance

Unless you have Stage 2+ turbos, you have a WG stuck. Get back in there and make sure you can move your actuators. Throw vacuum on them and watch them move.

+1

Your band clamp is preventing the waste gate arm from moving

[bpdef29]

Originally Posted by WedgePerformance

Unless you have Stage 2+ turbos, you have a WG stuck. Get back in there and make sure you can move your actuators. Throw vacuum on them and watch them move.

I'll double check tomorrow, thank you. I, probably foolishly, assumed the wastegate percentages on my logs to be accurate and normal even though there's no way monitor how open/closed they actually are (I'm guessing they're algorithms based on vacuum).

Here's another I just took today after flashing down to Stage 1 base. Starts and ends well, but the middle has another spike and throttle closure.

http://datazap.me/u/bdefiori/51-down...=0&data=2-3-20

[WedgePerformance]

Originally Posted by bpdef29

I'll double check tomorrow, thank you. I, probably foolishly, assumed the wastegate percentages on my logs to be accurate and normal even though there's no way monitor how open/closed they actually are (I'm guessing they're algorithms based on vacuum).

Here's another I just took today after flashing down to Stage 1 base. Starts and ends well, but the middle has another spike and throttle closure.

http://datazap.me/u/bdefiori/51-down...=0&data=2-3-20

Throttle closer's are normal and a safety feature to prevent overboost. Contrar to popular belief, throttle closures are not a bad thing, especial with a CAN map that is a one size fits all. Not all cars are created equal, but 99.9% of the time you can't feel the closure and really don't know it happens until you look at the log.

Looks like you still have a minor issue. Make sure the WGs move freely.

[bpdef29]

Originally Posted by WedgePerformance

Looks like you still have a minor issue. Make sure the WGs move freely.

Okay, so, took the belly pan off this morning and both v bands were clear of the actuator rods. Had someone start the car while I laid underneath and was able to observe both arms' movement of about an inch when started (contracted) and then when turned off (expanded back to open).

What is there now? Solenoids?

About throttle closures on a one size fits all map, I guess I'll have to upgrade to a custom map soon

[bpdef29]

Update: So when started, the actuator rods take about 3-4 seconds to close the wastegates to ~50% (this can be seen by the eye). When revved, both banks on the monitor module on my tablet show ~80% closure, but there is no physical movement/change in the actuator rods. Since the solenoids fail at an open state, I doubt its the solenoids (unless they can fault to closed). Vacuum canisters are holding vacuum as well.

When the car is turned off, the rods immediately move and open the wastegates, so the wastegates aren't "sticky".

[WedgePerformance]

Originally Posted by bpdef29

Update: So when started, the actuator rods take about 3-4 seconds to close the wastegates to ~50% (this can be seen by the eye). When revved, both banks on the monitor module on my tablet show ~80% closure, but there is no physical movement/change in the actuator rods. Since the solenoids fail at an open state, I doubt its the solenoids (unless they can fault to closed). Vacuum canisters are holding vacuum as well.

When the car is turned off, the rods immediately move and open the wastegates, so the wastegates aren't "sticky".

email me your vin and rom version and I'll send you a test file.

[bpdef29]

Originally Posted by WedgePerformance

email me your vin and rom version and I'll send you a test file.

Email sent.

[bpdef29]

Update: flashed to stock and logged. My old stock log showed underboost. Now, my NEW stock target boost is about where my OLD stock actual boost was, and my NEW stock actual boost is about where my OLD stock target was. WTF

Old (leaky):
http://datazap.me/u/bdefiori/stock?log=0&data=2-4-21

New (over):
http://datazap.me/u/bdefiori/stock-w...=0&data=2-3-20

[cristy7610]

I had similar problems with overboost and I fix it by replacing both solenoids...

[Mike@N54Tuning.com]

Originally Posted by j1gilles

+1

Your band clamp is preventing the waste gate arm from moving

That would be my guess.. (V-Band)

Mike