boost falling at high rpm?
 

hey! i've got an 88 tII and im having problems w/ keeping boost at high rpms on full throttle. it will hold boost if im heavy on the throttle, but not full. is it possible that it has somthing to do w/ feul. oh yeah im running a t04 w/ 750cc secondaries, and a stock feul pump. help me please?


thanks for the help

ps: i dont believe is my profec b-spec II boost cont.
i've messed w/ it enough to rule it out.

do you mean its goes up, holds, then towards redline it drops.

that is the norm for a turbocharger.

no it starts to drop at around 5500. and it drops fast. from like 13 to 6 real fast. im gonna keep messing w/ the boost controller and hope thats all it is.

any other suggestions are appreciated

It maybe your exhaust manifold gasket has a leak.

When you say you have a To4 , what is that ? A hybrid or a full out T04E , To4B ?.

If you have a hybrid, those are the symptons. You get 12-15 psi and around 5500 rpm it goes down to about 6- 7 psi.

The way around this is that you need to clip the rear wheel. You loose some spool time, but you can hold higher boost for longer.

yes it is a hybrid. what do you mean clip the wheel. take material off the exaust turbine?

You have to bring the turbo to a turbo shop. And yes they clip the wheel ( take some material off ) and then I beleive they rebalance.