Hi all just some advised required please. My car is mapped to 1.7bar peak but last night while on the motorway it was recording 1.9 bar on my toucan boost gauge it was cold and a empty road so i had plenty of room to enjoy myself. Now i understand its overboosting can some explain why? And is overboost good or bad for my engine?

Cheers

 

Bad.

 

Could be the cold weather causing it may need the boost solenoid duty cycle adjusted in the map.

 

As above its not ideal, Was it mapped in summer by any chance as it could be the colder temps having an effect

 

It depends whether the cooling, tune, fuel flow, octane, compression, engine internals, clutch and transmission are up to the extra boost, whether it introduces a loss of smoothness or boost oscillation etc.

If you have it tuned on the bleeding edge at 1.7 bar and it is on the limits for a few or more of the above then it will probably do damage. If on the other hand you have engine management that is doing closed loop boost control is and is deliberately programmed to run extra boost and knows the wideband O2 and is good at knock control then it may be completely by design.

Bottom line, is it a timebomb shed that you're stretched to the max or a quality setup with depths of engineering reserve built in? If the latter I expect you'd already know the answer.

 

Cheers lads, its running on alcatec ecu, it does have closed loop boost control and is kept at very safe boost at 1.7 it has auto knock detection and deletion and was put together by ET so from looking at jbanks comment im assuming it wont do any damage.