Stopping boost creep on BNR S3.

[neganox]

Check your vacuum lines on your ebcs. Has this always happened or did it just start happening? What boost levels do you see on spring pressure only?

 

[Redline]

Revviving a old thread!!!
I am having a over boost situation during the initial spool. The map commands 20 psi and I am hitting 25+ for a few frames(5) on the datalog. My tuner told me to check the ebc lines and the connectors (cap)on the waste gate actuator .I am currently checking the actuator but my actuator has only one nipple that is connected to the ebc is not extra nipples to cap.

This is how my Stratified 3-Port is hooked up on my BNR S3 setup (also with only one port on the WG actuator). Works flawlessly:

You may want to check for kinked/pinched boost lines, too. They can ruin your day/cause things not to run correctly.

 

[neganox]

Only follow the stratified instructions if you have the stratified ebcs. I believe they're different from the normal MAC or GS ebcseseseses.

 

[Redline]

Only follow the stratified instructions if you have the stratified ebcs. I believe they're different from the normal MAC or GS ebcseseseses.

Pretty sure the port numbers/roles are the same on all the MAC-derived valves, but feel free to fact-check me on this. The thing that can be confusing is COBB and Grimmspeed locate the ports differently. And the numbering system is counterintuitive. By far the easiest thing to do is call the manufacturer of your valve and get specific directions on what nipple goes to what item (boost source, WG actuator, and intake) with your specific EBCS in interrupt mode.

Since the Grimmspeed and COBB look different in terms of port location, Lex made this. Use this in conjunction with the pic I posted above: http://www.stratifiedauto.com/Stratified
Downloads/3 Port Solenoid Instructions.pdf

(The bottom of the PDF - interrupt mode - matches the Stratified's EBCS' port numbers exactly.)

 

[Memin]

The boost target is 20psi and I am overboosting to 24psi and it just started a week ago, I switched to a old map that I know as running good 3 weeks ago and same outcome. I am currently running spring pressure an I see 12.4-13.00 psi WOT. Here is one log.

 

[Redline]

The boost target is 20psi and I am overboosting to 24psi and it just started a week ago, I switched to a old map that I know as running good 3 weeks ago and same outcome. I am currently running spring pressure an I see 12.4-13.00 psi WOT. Here is one log.

That log shows boost spike, not boost creep. You'll know creep because your WGDC will keep going down as the ECU tries to lower boost, but your psi will keep going up. Wanna see true creep? Check this out (0 WGDC and 26psi - attached).

Your log just looks like you need your tune revised.

*My creep wasn't Justin's fault. Creep isn't a tuning issue; it's a mechanical issue. My workaround was getting a Guardian Angel and spraying methanol for extra fueling so I don't go lean. Besides, it never goes over 26psi, and only happens in the cold.

 

[Memin]

Is not he tune because I switched(3) maps same outcome, and I run that map that you see the log a spring pressure no spike 12.5 psi so is not the map.I aleady change al my EBC lines, switched map to a map that was spot on 3 weeks ago, check waste gate flapper (tested with air compressor) double check EBC lines connection on tri port .Last thing to do is swap EBC (ordered should arrive this week) to see because I have covered all the bases I think!!

 

[Redline]

Is not he tune because I switched(3) maps same outcome, and I run that map that you see the log a spring pressure no spike 12.5 psi so is not the map.I aleady change al my EBC lines, switched map to a map that was spot on 3 weeks ago, check waste gate flapper (tested with air compressor) double check EBC lines connection on tri port .Last thing to do is swap EBC (ordered should arrive this week) to see because I have covered all the bases I think!!

It looks like textbook boost spike. If another tune does it too, then that makes it even more likely. The fact that a spring pressure log is a constant 12.5psi proves my point even more. You have a boost control issue. That's a tuning issue. Again, creep isn't a tuning issue, it's a mechanical one.

Who tuned you? And what exactly did he say/was his rationale? Look at the relationship of your WGDC to boost level. Then look at my log in the same way. Major difference.

I've tuned these cars for years and been an active member of forums for them for 5 years and have seen a lot of stuff like this. It really looks like boost spike, not boost creep. Ask @Jason@DizzyTuning and other reputable tuners too, if you want.

 

[neganox]

If you're hitting 12.5 on spring pressure with no spikes... but then switching to a map where it does spike.. then that's not boost creep that's overboost.

Also check out:
https://mazdaspeeds.org/index.php?threads/3-port-ebc-acting-up-overboosting.3689/

 

[Memin]

Oh ok I got you.I see the waste gate duty cycle going over 50%+ in a few cells right before the spike. The problem is that old maps that were working normal (not spike)now have boostpike 23 psi.What would be the explanation for that?

 

[Redline]

Oh ok I got you.I see the waste gate duty cycle going over 50%+ in a few cells right before the spike. The problem is that old maps that were working normal (not spike)now have boostpike 23 psi.What would be the explanation for that?

Too high commanded WGDC and/or too aggressive WG dynamics table settings in your tune.

Edit: may want to check commanded boost targets too, to be doubly sure, just in case...