MirageAsti

My boost used to be 0.8, now by the looks of it, only 0.6.. 0.7 spike then drop to 0.6 bar. What can be the cause?

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CJ5A Lancer MR - 4G93 Mivec RS hybrid, stock everything else.

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DanzEterna

vacuum leak?

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MirageAsti

Vacuum leak? Will that cause boost leak? I think its caused by the wastegate or BOV not holding boost?

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CJ5A Lancer MR - 4G93 Mivec RS hybrid, stock everything else.

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vspec

in my case, it was the wastegate

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I hate when people bring up the A to B bs lol it's all about having fun getting there

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MirageAsti

the wastegate failing? i can hear chatter from the wastegate

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CJ5A Lancer MR - 4G93 Mivec RS hybrid, stock everything else.

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jun_ng_1208

Mine was with the boost controller last time, was using 'tulang ikan' boost controller back then, boost all the way up till 0.9 bar then dropped to 0.6 on high rpm...changed it to boost tee & its all good now :)

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ixeo

Manual boost controllers work either using leak, or ball & spring type like boost tee. I've got a used original turbosmart boost tee for sale if you're interested.

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ahloy74

Bro, do a boost leak check. Google it, you would be surprised to know all the clamps are potiential leak point. Did mine and changed all the clamps to a bolt type clamp.

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MirageAsti

Just done making a screamer pipe just now. Boost back up to 0.8 lol. Backpressure problem?

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CJ5A Lancer MR - 4G93 Mivec RS hybrid, stock everything else.

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ahloy74

Hmmm...kind of wierd....never heard this can cure a boosting problem but true enough, you solved it..

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MirageAsti

Actually kind of overboosting to 1.2bar right now.. Screamer pipe normal problem..

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CJ5A Lancer MR - 4G93 Mivec RS hybrid, stock everything else.

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MG42

is this 4g63 or 4g93?

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ahloy74

Meaning the screamer outlet is kind of small and making the venting of exhaust gas via wastegate is rather less. Now more exhaust gass will turn the turbine and making higher boost. Correct?

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Hadi17

In my case I set the boost to 1 bar and when I boost, the meter shows more than 1 bar..
It goes more than 1 bar like 1.1 . why is that so ? and I get some backfiring after boosting kuat sikit .

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ahloy74

Hadi, think thats normal. It is called boost creep. Its the nature of your wastegate spring. If you use electronic boost controller, this creep can be minimised. Not very sure bout the backfire though. If not mistaken, mitsu ignition sys is wasted spark. Sometimes you get this kind of pop sound when gear changing in normal manner. Not tarik time. Think so...

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