scoootie5

Sorry for all the threads I have been doing lately but I am having one of those moments with my car at the mo.

Just a quick question about dawes MBC and the ECU control over boost.

If I lower the boost to say 0.7bar and the ECU is set for 1.2bar will the ECU think that the boost is too low and adjust accordingly to raise boost?

I found this problem when trying to lower my boost to stop det and set the MBC to 0.7bar but when I put my foot down the boost gauge showed 0.7 for 1second then shot up to 1.2bar. I do have a aftermarket ECU which is mapped to 1.2bar by the way.

Thanks
Scott

swan

'ello Scott,

I don't see how the ECU could over ride the MBC if the latter is set up correctly? MBC should prevent anything over the .7 if it's in the right place.

scoootie5

Thats what I thought.

My MBC is set up between my actuator and the nipple on the turbo.

I have got a FCD would this cause the symptoms?
I cannot see anything that will increase boost like this and I have also cleaned out the MBC with carb cleaner just in case it was getting stuck.

Scott