hey ,
I have noticed that I am getting a rattle when I build up to boost, but only during 4000 - 5000 rpm after that it dissapears.

Any idea what it might be?

Cheers in advance!

 

What fuel are you using and is it your usual fill..?

 

Robster, assume it's detonating until you know otherwise. Get it checked out by a tuning specialist immediately if not sooner, and don't rag it until you have done so. Get it on V power if you haven't already.

 

yeah been using v-power from day one, wouldn't use anything else. I will take it to ma garage and see what they say.

Cheers guys

 

Bung some octane booster in there and see what happens.

 

Could be something innocent like the heat cover on the turbo????

 

it all depends on what you mean by rattle - my wife's WRX has a loose header heat shield and that rattles only at certain revs

It might be something simple but like Alan said it could be detonation so get it checked