So i have not logged my car since a track day a couple weeks ago. I am on stock turbo and mods in my sig. I can hit 20 psi at 3200 rpm on a good day but today went to check my tune and I am not hitting 20psi till 4700 rpm, my high rpm boost is in line with what i normally run so I am wondering what to check. I just made the change to colder plugs and cleaned my air filter. I am thinking my forge wga needs cleaned or lubed? Any other suggestions before i start tearing in?

 

Wastegate maybe?

 

Thats my thought, definitely holding good boost up top, same as always. I will disassemble tommorow after wk.

 

Ill say that my Forge WGA had some major issues, ill wait for a response from them first but if not quickly ill post more. Put stock back on for now. All my spool is back and then some.

 

Either the Forge wga arm is too loose or you have a boost leak.

Usually if a WGA is stuck and doesnt open then you will boost more. But your case is you are boosting late. From my past experience if the cause is from the wga then the adjustable arm is too loose (or set too long). Either that or boost leak someplace.

 

Before you take the WGA off, make sure all houses and clapms are tight.
That is the number one casue of a slow spooling turbo. Specially if it was working good a few weeks ago.

I check my pipes and connectors every 2 weeks. Every week if I have time.

 

check all the vaccum lines and the upper and lower pipe for leaks or anyother leaks in your car.

 

somebody must have installed a 35r on your Evo while you were sleeping. jk

 

It was the WGA, Forge took care of it and all is good now. Have to retune, but my LC-1 started acting up, so ill figure that out tommorow and go from there.