HKS Boost Controller Query

[red17]

Hi everyone,

Ive been experiencing some issues over the past few days with my car ever since i turned on my HKS boost controller. Now ever since ive had the car, when you turn the controller on and set it to LOW, then its identical to driving the car with the controller OFF. eg: standard boost.

But whilst driving the past few days its seemed like when on boost that the pressure the turbo is producing is all over the place, keeps spiking up and down even with constant throttle. So while trying to diagnose this problem (not even thinking it could be the EBC) i drop it into third at about 60 and watch the boost guage spike to 1.1bar. (Further tests since show it seems to be spiking around 0.9, only occasionally hitting 1.1).

My reaction at this point was OH **** ive been driving around for a week on 1.1 bar! Instantly I reach for the glovebox and turn off the controller.

Do the same test again, 0.7bar, standard boost. Hmmm ok.

Now considering ive never adjust or messed with my boost controller since getting the car. Why the hell is it now producing what ever boost it feels like depending on the wind direction or what mood its in?

The model in question is a HKS EVC 1... a dinosaur as far as boost controllers go.

Its a bit scary when you cant rely on your boost controller to limit boost like its meant to. I only wish id noticed it sooner, hopefully I havent done any damage.

Anyone else experienced this? Is it a fauly pressure switch or something?

Red17

[dojobi]

Well firstly, I don't think you will have done any damage. 1.1 bar, whilst not good for it, probably won't kill the turbo if you only give it a little bit here and there.

Secondly, I've never heard a good thing about the original HKS boost controllers. I don't know which part of it is inaccurate though. You may be better off getting another one.