Turbo Surge Under Boost

[Getaboutabit]

This is a carry on from another thread I may have hijacked a bit.
My car surges a bit whilst under acceleration Boost fluctuates
between about 11 psi to 16 or so. The car is a 2012 ST Cab chassis
3"exhaust Anything else is unknown at the moment. There is no external
sign of oil near or around the inter cooler although there is some visible
when you remove the intake hose. Inter cooler is standard
Still need to check the boost lines / hoses
Any thoughts

[threedogs]

Id be checking all boost and vacuum lines
What does it do if just cruising at say 60kph

[Getaboutabit]

sitting around 60ks car seems fine Only really happens
when running thru the gears I had a quick look at the
Vacuum and boost all seem tight and sealed I'll have a
better look during the week

[threedogs]

Maybe your IC is leaking as well, spray any sensors
making sure they are dry before re fitting them

[Getaboutabit]

Thanks for the reply Will check inter cooler, Would MAF sensor
cleaner be ok for any sensor If you run it upto or past 3000 rpm
there doesn't seem to be any fluctuation So may just need to drive
it a bit harder

[Tolch]

Got the same problem with mine - 2013 ST manual wagon. Looked, checked and cleaned everything I could find. A real pain in the b-m. Read heaps on the subject but no one seems to have a definitive answer. I am sure there are several possible causes so it is next to impossible to pin it down to just one or two things. I'll keep looking and checking as an when I can but running out of enthusiasm. If someone knows of someone else who has found a magic bullet I would be more than interested to know what they discovered.

[SG1]

Would dawes and needle valve solve this problem, taking boost control away from ecu and doing it manually?

[Getaboutabit]

I was thinking this may be worth a try
I don't think a Dawes valve ect costs much
so might buy them and see.

[threedogs]

I was thinking this may be worth a try
I don't think a Dawes valve ect costs much
so might buy them and see.

You'll need to fit some gauges to monitor your boost and egts once the egr block is in place

[Getaboutabit]

I've got Boost and EGT Gauges fitted
Do I need to block egr?