Boosting on a Budget- 19birel's MK7.5 Build

[19birel]

I think I'm about 500 miles deep into being off the jank burble file and I'm pretty convinced the promblem is solved, so I just have to remember to send that catch can back before the return window closes.

In other news though, I was driving last night, did a pull in 4th and the car threw an EPC light and reduced power . Scanned and it was an underboost fault that cleared after a key cycle. A quick second gear pull revealed I was hitting boost target and making all the power so there's no leak. I'll have to try to log a 4th gear pull again to see if I can replicate it, something tells me I just need to make a wastegate tweak. Just annoying bc a 4th gear pull requires some space and spicy speeds

 

[Diggs24]

Minimum engine speed for CAP Low Diagnosis

Set RPM higher, something like this:

 

[19birel]

Minimum engine speed for CAP Low Diagnosis

Set RPM higher, something like this:

View attachment 310415

Oh thanks! I definitely would not have thought to check that...what is CAP Low Diagnosis?

 

[Diggs24]

Basically it's looking at boost vs setpoint and if it takes too long to get close to setpoint it triggers the underboost. Those of us with laggy turbos have this issue if we get on it at low rpm in higher gear. Moving the rpm up says hey I still wanna know if there's an issue but not if I get on it way too low in this non-IS20 turbo.

 

[19birel]

Basically it's looking at boost vs setpoint and if it takes too long to get close to setpoint it triggers the underboost. Those of us with laggy turbos have this issue if we get on it at low rpm in higher gear. Moving the rpm up says hey I still wanna know if there's an issue but not if I get on it way too low in this non-IS20 turbo.

Ahhh gotcha, that makes a lot of sense! Thanks again, that would've had me stumped for a hot minute haha

 

[19birel]

CEL came back for the cat, after seeing Acadia started to experience the same thing with the Cobb dp, I've just accepted that it is what it is and threw a small straight spacer on. I have a vibrant style J spacer but the O2 sensor to too long to fit- if this doesn't work I think I have a way to make the J spacer fit

Also reconsidering getting TCR rep skirt over the 7R reps as by the time they R skirts show up it'll be too cold to paint them...decisions​