Also when I put my foot down after 4,000rpm -7rpm ill get a thud and the car and me jault like discs are banging together. Im thinking its clutch. Happens in most gears. Only if I put my foot down.

 

Do you mean when you put your foot down on a fast hard gear change?
If so thn i think its just your rear diff moving about, mine does it.
I dont think its anything to worry about.

 

no its if i put my foot down in any gear from 0-100 it will do a big jault around 5rpm. Make a thud noise.

 

Is it like hitting a brick wall? will the car let you hit boost?

 

That will be overboost sensed in the ecu and the fuel cut very suddenly.

Usually occures in cold weather when boost will be high.
Bet if you just e a s e the throttle off at '4900' you can drive through it?

 

yeah thats 100% right.
Yeah only happens certain times.

 

The prob will be far more noticeable in cold air and /or if you have an aftermarket exhaust allowing freer flow. The 2 together makes for a difficult prob to overcome.
A boost controller will do it, but you might want to consider a good ecu like apexi or Simtek.

 

so its not really a problem.

 

The only problem side is the severe jolt the car gets instantly when the engine is certainly giving its all.
It will probably go in the hot summer, though in my case it didn't, hence the Blitz boost controller which worked, but cost too much. But i knew even less about Imprezas 5 years ago...

 

Can the over boosting dammage the engine?

 

Yes

 

Even tho its only a split second it over boosts for? (Im on about turbo spike, over boosts on gear change and thn drops back down to normal boost.)

 

how do you get over it?

 

Boost controller (limiter) using an adjustable system or a decent ecu like Apexi.

 

i'd go the ecu route

 

boost controller hasnt solved mine, or a type ra e.c.u