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Discussion Starter · #1 · (Edited)
Hello Everyone, I have a bit of a boost issue and would like to know if anyone has ever had similar. I have a 2019 STi and am having an issue with my boost. No matter what my tuner does with the WGDC I always hit 17-19 psi. Even when its set to 0 and I should be hitting spring pressure it still stays at 17-19 psi.

As far as testing goes .. I've routed the hose from my turbo nipple to the EWG and it maxes out at spring pressure - 13 psi.

I've disconnected the hose to the EWG and gave it moderate throttle and was able to boost over 19 psi.

I've double and triple checked my hose routing and wiring to the EBCS and all seems to be ok.

I even replaced my grimmspeed 3 port with a Cobb just to be sure I had a known good one.

I recently installed a Blouch 2.5 XT-R, TGV Deletes, IAG PTFE lines and rails and a 3" turbo inlet. I already was on e85 prior with no issues.

I'm also on a speed density tune.

Any Ideas? TIA

here is a pull log PULL LOG
 

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Honestly there could be a few things going on. Woth the 2.5xtr i would try and make absolutely sure that the springs in the gate are indeed 13psi. Try and test it with a hand pump of some sort with a gauge and see when it actually open with the spring.
Secondly can you draw us up a diagram of the plumbing?
Us it an internal or an external gate and what size is it?

Is there confirmation of the EBCS clicking on and off during testing and tuning? Check it using the test pin connectors with the car in the on position but not started.

It sounds to me like the springs are stiffer than they should be. If he adds the wgdc to increase in boost is there a change? This shouldve been easy to check as the car is not knock limited so during the initial steady state tuning he should have gauged it right after as he started ramp runs.

Sent from my SM-G965U using Tapatalk
 

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Discussion Starter · #3 ·
Honestly there could be a few things going on. Woth the 2.5xtr i would try and make absolutely sure that the springs in the gate are indeed 13psi. Try and test it with a hand pump of some sort with a gauge and see when it actually open with the spring.
Secondly can you draw us up a diagram of the plumbing?
Us it an internal or an external gate and what size is it?

Is there confirmation of the EBCS clicking on and off during testing and tuning? Check it using the test pin connectors with the car in the on position but not started.

It sounds to me like the springs are stiffer than they should be. If he adds the wgdc to increase in boost is there a change? This shouldve been easy to check as the car is not knock limited so during the initial steady state tuning he should have gauged it right after as he started ramp runs.

Sent from my SM-G965U using Tapatalk
It's externally gated and I've had the 13 lb set up since I initially installed the wastegate. As far as the plumbing goes for the EBCS, I have port one to inlet, port two to EWG and port three to turbo nipple.

Ill try the EBCS test with the test pin (havent tried that yet) I did however actuate it using the battery and it held using a vacuum tester.

Yes, regardless of the WGDC high/ low the boost does not change. I still hit 17-19 psi. I appreciate the input btw.
 

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Did the tuner just stop mapping the car because it wasnt seeing spring pressure? Is the car at the moment only on 0% wgdc? And not aiming to hit a higher target boost? If he adds wgdc to the map and the boost rises in similar increments between PSI I could only assume that the problem is something mechanical.

IE you may need a lighter spring, bigger gate to defer exhaust gas pressure before the turbine inlet housing.

Just to clarify, even if the tuner had turned off boost control and ran it soley on the gates spring pressure it still sees 17-19 psi?

A .9 or 1bar spring tends to start opening much sooner than that and achieves full open status at as more exhaust gas back pressure is created OR if the boost controller is commanded to be 100% in that region to keep it closed to meet minimum spring pressure.

Sent from my SM-G965U using Tapatalk
 

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Discussion Starter · #5 ·
Did the tuner just stop mapping the car because it wasnt seeing spring pressure? Is the car at the moment only on 0% wgdc? And not aiming to hit a higher target boost? If he adds wgdc to the map and the boost rises in similar increments between PSI I could only assume that the problem is something mechanical.

IE you may need a lighter spring, bigger gate to defer exhaust gas pressure before the turbine inlet housing.

Just to clarify, even if the tuner had turned off boost control and ran it soley on the gates spring pressure it still sees 17-19 psi?

A .9 or 1bar spring tends to start opening much sooner than that and achieves full open status at as more exhaust gas back pressure is created OR if the boost controller is commanded to be 100% in that region to keep it closed to meet minimum spring pressure.

Sent from my SM-G965U using Tapatalk
So I'm currently E-tuned but am saving up for a Dyno-Tune. Part of me believes it could be the tune but I want to eliminate any issues before dyno day. If I cant resolve this issue I guess I can always pay the professionals at the tuning shop once I schedule my appointment.

The car is at 0% WGDC at the moment, set to run only spring pressure and is easily hitting 19 psi. when he does increase WGDC percentage boost does not change. So boost does not change with WGDC at all.
 

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Honestly there could be a few things going on. Woth the 2.5xtr i would try and make absolutely sure that the springs in the gate are indeed 13psi. Try and test it with a hand pump of some sort with a gauge and see when it actually open with the spring.
Secondly can you draw us up a diagram of the plumbing?
Us it an internal or an external gate and what size is it?

Is there confirmation of the EBCS clicking on and off during testing and tuning? Check it using the test pin connectors with the car in the on position but not started.

It sounds to me like the springs are stiffer than they should be. If he adds the wgdc to increase in boost is there a change? This shouldve been easy to check as the car is not knock limited so during the initial steady state tuning he should have gauged it right after as he started ramp runs.

Sent from my SM-G965U using Tapatalk
Were you haveing this issue before doing the turbo upgrade? Were you running an EWG before?
Maybe double check that waste gate spring just so you can rule it out.

As for checking the EWG by hand pump activation, keep in mind that the physical movement/travel of the ewg valve itself only moves a slight bit when using a hand pump. A majority of the movement/travel will happen due to exhaust gas pressure. I know i found this somewhere on Tial's website or instruction somewhere. Just my 2cents.
 

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I don't see WGDC in the log. Need that to know what's going on.

How is the gate plumbed?

Hello Everyone, I have a bit of a boost issue and would like to know if anyone has ever had similar. I have a 2019 STi and am having an issue with my boost. No matter what my tuner does with the WGDC I always hit 17-19 psi. Even when its set to 0 and I should be hitting spring pressure it still stays at 17-19 psi.

As far as testing goes .. I've routed the hose from my turbo nipple to the EWG and it maxes out at spring pressure - 13 psi.

I've disconnected the hose to the EWG and gave it moderate throttle and was able to boost over 19 psi.

I've double and triple checked my hose routing and wiring to the EBCS and all seems to be ok.

I even replaced my grimmspeed 3 port with a Cobb just to be sure I had a known good one.

I recently installed a Blouch 2.5 XT-R, TGV Deletes, IAG PTFE lines and rails and a 3" turbo inlet. I already was on e85 prior with no issues.

I'm also on a speed density tune.

Any Ideas? TIA

here is a pull log PULL LOG
 

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Discussion Starter · #8 ·
Were you haveing this issue before doing the turbo upgrade? Were you running an EWG before?
Maybe double check that waste gate spring just so you can rule it out.

As for checking the EWG by hand pump activation, keep in mind that the physical movement/travel of the ewg valve itself only moves a slight bit when using a hand pump. A majority of the movement/travel will happen due to exhaust gas pressure. I know i found this somewhere on Tial's website or instruction somewhere. Just my 2cents.
Thanks for the response, yes I've been on an EWG with at 13 lb spring way before this recent install of parts. At this point in willing to double/ triple check everything to make sure things are in order.
 

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Discussion Starter · #9 ·
I don't see WGDC in the log. Need that to know what's going on.

How is the gate plumbed?
I have port two of EBCS going to the side of the EWG and the top port vented to atmosphere. This is how it's always been set up and working correctly. I can get a new log tonight with WGDC and I'll post a link to that. I just can't figure out for the life of me what I could have disturbed during install to cause an issue where my boost doesnt change with WGDC.
 

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It's certainly reasonable. Question is, why does you tuner think you should be running 0 WGDC? It's not difficult to do.

If you need a hand with an e-tune LMK. I e-tune dozens of cars a week all over the world.

Or just send me your full mod list and I'll send you a test map to try out.

so with that 30 percent would me hitting 17 psi be normal since is 3 psi over spring pressure?
 

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Discussion Starter · #19 ·
It's certainly reasonable. Question is, why does you tuner think you should be running 0 WGDC? It's not difficult to do.

If you need a hand with an e-tune LMK. I e-tune dozens of cars a week all over the world.

Or just send me your full mod list and I'll send you a test map to try out.
So I think I may have a boost leak, I believe my tuner turned my WGDC down to prevent overboosting if I found and fixed a potential leak. Let me contact my tuner and see if I cant get this straightened out. Thanks for the help and I'll keep your offer in mind. Once again, I appreciate all of the help.
 

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Perform a boost leak test and and confirm if there is. If there isnt then i would probably try a differrnt tuner. Considering you are using a 3 port boost controller in that plumbing configuration, i would wonder if the frequency of the controller has been adjusted and if the dead band portion of the solenoid is taken into account. Of a lot of the 3 ports i have run into on standalone ecus, the dont really due anything until you command about 13ish %. So that 17ish psi seems about right to me anyways.

Sent from my SM-G965U using Tapatalk
 
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