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The mkiv Supra Owners Club

Help with Boost


Dim Sum

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I'm trying to get the car to boost to 1.2 bar but its only peak at 1.05.

Just wondering what could be restricting the flow.

 

My boost controller is set on 1.2. on gain of 70.

 

The boost reads

first gear : 0.46

Second : 0.96

Third : 1.05

 

Didnt record the rest but it peak at 1.19 at Sixth gear.

 

For me to get 1.2 bar of boost i have to put the gain up to 70.

 

Anyone got any suggestions?

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The boost will always be higher the higher the gear you are in, as the engine is under more load. If you set it to 1.2bar in 3rd gear then it will overboost in higher gears.

 

Some electronic boost controllers allow the boost settings to be mapped against speed, rpm, throttle position, etc. this helps maximise the boost pressure through each gear.

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