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Discussion Starter #1
I have a r33 gts with a boost controller. It runs very well when set on 0.5 bar of boost but it just makes a loud hissing and goes no faster when boosting at 0.8 bar,

Could this be spark plugs?
It also emmits a little black smoke at gear change is this o.k?
 

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I had this a couple of weeks ago & the pipe from the turbos to the intercooler had come loose. Same symptoms as yours. Refitted it & sorted straight away.
Might be worth a check.
 

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Discussion Starter #3
Cheers mate, will check it out, someone else said it could be over fueling - is this likley?
 

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Not sure about that - my knowledge is limited to whatever goes wrong on mine !!
 
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