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Over boosting


Locko90
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  • Member
  • Member For: 6y 10m 3d
  • Gender: Male
  • Location: Mildura

Camo is correct, removing exhaust restrictions will allow the turbo to boost easier and hit boost cut. It's needs a tune, the factory ECU can't adjust for mods and the ba engines are fragile. Actuator and solenoid are the other problems that can cause those symptoms without the exhaust modification.

The ECU uses 2 MAP sensors, one in the intercooler piping under the battery and one in the manifold.

Injectors are easy enough to replace, but you can't change them for bigger ones without a tune.

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  • Dropping a turd
  • Gold Donating Members
  • Member For: 14y 9m 16d
  • Gender: Male
  • Location: Perth

Yep,

Gauges are useless if they dont warn or have peak recall. Whats the chance you will be looking at the oil pressure gauge when the oil pump dies. ???

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  • Member For: 3y 4m 5d
Do you have a boost gauge? What boost is it hitting in 1st and 2nd? The vehicle is under more load and can produce more boost under more load.
So I guessing that in 1st and 2nd it's probably not building any more boost then 10psi, allowing it to rev out and not cut, I'll have to check it today.
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  • Member For: 3y 4m 5d

So yeah took the car for a drive the other day and I've confirmed it sits at 10psi WOT through first and second but as soon as I shift into third and plant it, it wants to sit on 12psi then it cuts.

 

could I possibly by pass the boost solenoid and stop the ecu boost cut?

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  • less WHY; more WOT
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  • Member For: 14y 4m 2d
  • Gender: Male
  • Location: Melbourne

yes, that should limit the boost to what the actuator is rated to and get there as slowly as the turbo can build the boost, so that'll bypass the tune's boost control and allow you to diagnose it mechanically instead of electronically, in the first instance.

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  • Member For: 3y 4m 5d

Okay well I'll give it a go on bypassing the boost solinoid and try just it on waste gate pressure

 

Should I unplug the boost solinoid or leave it plugged in?

 

I'll just run a hose from the turbo directly to the boost actuator

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