I Loose Forward Motion On Boost! (intermittently)

[im late]

Hey All,

My car has been working fine for the last month (I just got it back after 5 months).

Basically (every now and then) the following will happen.

I'll take off from stand still. Then I build the boost, foot to the floor, once the boost controllor has reached its setting (which is currently 20PSI) turbos will give forced induction for a second then instantly I loose all boost!!

Motor is still running and of course I am still driving along but its like you are driving fast then you hit a brick wall !!!!

My head luches forward as if I have the BIGGEST ALCON brakes ever!!! lol

This happens half of the time. Sometimes my turbos pull all the way to redline (like they should). Some times I get the issues described above.

I just got my car back after some MAJOR work ( link of work done: http://www.skylinesaustralia.com/forums/Rb...80#entry4458247 , Scroll halfway up the page to see my mod list/dyno results )

It has been working fine up until end of last week.

Yes I am taking it back to my mechanic to sort it out, I just wanted to share my experience with everyone on SAU and also see if anyone has had the same issue.

Any comments/advice greatly appreciated.