Never heard of the fuel filter trick. Interesting idea though.

I assume you can't feel the MAP bouncing around like that and it's just the sensor? Have you tried removing the tee to see if that's causing issues?

Also, Fire, thanks for reminding me I need to spend money on a CAN Lambda gauge

 

What rate are you sampling at in your datalogs? I believe the Maxxecu Race can sample at up to 1000hz. If you could do a pull logging at 250hz or so I suspect you could see individual intake pulses. Might help you determine the cause.

 

Oh dang, that's actually a really nifty trick with the filter! Ok, if nothing else, I'm glad to hear that this isn't a one-off case, as someone's obviously thought of this before. I'm gonna see what happens if I add some mild smoothing above 100kpa and will give the physical filter a go depending on results.

As far as the integrated wideband controller.... yeah I'm still running an analog signal from my AEM for now. I do have it set up to where the gauge and ECU read within a tenth of each other, though. I didn't think I'd want/need to set up the controller so I clipped the wiring at the ECU end and now I'm gonna have to run another harness through the firewall into the engine bay to get that up and running lol. That's on the to-do list, but the list is currently looooong.

Sim, no, the bounce isn't noticeable via the butt dyno. I can try capping off the tee to the boost gauge but I'm still under the assumption that there just needs to be some level of smoothing via the ECU or in the MAP line as Nate suggested. I'll cap the line off if filtering fails.

Watterson, damn, good catch. I just checked and I'm only logging at 25hz. Never would've thought to check logging frequency. Still, since the car showed this behavior with the previous ECU, I assume it's just a result of the hardware? Lots of valve overlap while in boost causing noise in the MAP line?

I set up a table to start smoothing MAP once the engine's in boost. No idea if a 4-event sample size is high or low. The preset filtering options showed 4 events as the smallest option and 32 as the highest. We'll see what she does on the drive home.

 

Well that worked an absolute treat.



Much smoother now. Previously, there was so much noise that EGO wouldn't even activate. More tweaking tomorrow.