black944 turbo

This may sound obvious. Have you tried to adjust the mbc since reversing?

Peedster

Yes, and when I turn it completely shut the boost should be minimal and the WG spring sets the boost (0,9bar) when the exhaust gases pushes it open?

If I open the MBC so air goes through it should set the boost pressure higher right?

Could someone explain this simple process to me please?

black944 turbo

Try bypassing the mbc and run your vacume line straight from the ic pipe to the wastegate. If this does not work check the wastegate with compressed air and make sure it opens.

Have made sure your vacume line is not torn?

Peedster

I've got controlled boost!

I did some thinking and bypassing the MBC means that boost signal goes uninterrupted to the WG and this will make the WG open at spring pressure.

My MBC is constructed that if I turn **** clockwise to + it will open fully and let air through. If I turn minus it will close airflow.
I thought turning it to plus it would mean more boost but it's the opposite which is strange to me.

Anyway it's working but in single port mode until I fix a 2-piece crossover.
It's really sensitive though because the MBC has about 8 turns totally but the adjustable boost range is only a quarter turn.

Now it's only the strange startup idle left!

/Peter

White_951

My MBC was perfect for the stock afr...once I added the M-Tune I needed a more finite boost controller so I bit the bullet and went with the eBoost2...pricey but cheaper than grenading an engine !!!!