Hi Guys (& girls),

 

I have been experiencing some very strange symptoms when messing with my boost controller.

 

Basically, it is overboosting when the EBC is on. I have fiddled with all of the settings and have even had an expert play with it as well (you know who you are!).

 

This has led me to think that maybe one of the wastegate actuators could be sticking. :confused:

 

However, when I turn the EBC off I get the normal 7psi safety boost. This doesn't make sense to me as I would imagine if it was a sticky wastegate then the pressure would not stop at 7psi and it could overboost regardless of whether the EBC is on or not. :confused:

 

The final strange thing is that when the duty cycle of the EBC is set to around 24% I can get up to around 9psi of boost then if I increase this to 25% it will overboost all the way up until it starts detting!!! :cry:

 

How can a 1% change in duty cycle affect the boost so much? bearing in mind the gain and set gain parameters are sensible? :confused:

 

Any help gratefully received...

 

P.S. I think this is a mechanical fault not a fault with the EBC as it was previously set up fine but has just started to overboost.

Hmmm, will have a fiddle over the weekend.

Cheers...

>> It seems strange that the EBC could be the problem when it also happens when the EBC is off?

 

well...the overboost problem starts as soon as you turn on the EBC.

even after you turn the EBC off the problem stays for a while

So my guess is, that the EBC is probably still energizing the EBC solenoid...even when it's turned off.

 

that's why I asked to disconnect the solenoid (or otherwise cut the power to the EBC completely) when it's in overboost mode with the EBC turned off.

 

You will probably find it goes back to normal 7psi boost almost instantly

>> It seems strange that the EBC could be the problem when it also happens when the EBC is off?

 

well...the overboost problem starts as soon as you turn on the EBC.

even after you turn the EBC off the problem stays for a while

So my guess is, that the EBC is probably still energizing the EBC solenoid...even when it's turned off.

 

that's why I asked to disconnect the solenoid (or otherwise cut the power to the EBC completely) when it's in overboost mode with the EBC turned off.

 

You will probably find it goes back to normal 7psi boost almost instantly

OK that kind of makes sense.

Probably the only thing I haven't really tested is the actual EBC controller.

 

I will try to get it to overboost then disconnect it.

 

I hope you are right Eric cos I should be able to fix the problem myself if you are.

 

Thanks again, Mike...