Bulent Aliev wrote:

Hi Paul, over the last couple of months I noticed that people with
turbochargers like the one you are going to use are having problems
with
over boosting. John Slade is flying with the waste gate fully open
and air
bleed at the intercooler. Still he can not apply full power for being
afraid
of detonation. Looks like someone has to specialize in cutting down
the
blades on the hot side of the turbo? Bleeding more air on the cold
side will
only over speed the wheels. I just had mine rebuilt, but looks like
have to
do something about this problem.
Bulent

What year turbo does he have? There is a big difference in the waste
gates
from 89 to 90. The 91 is+ on the left. If you have an 88 you can port
the waste gate
and or run a separate exhaust pipe for the waste gate instead of
making the gas
turn right angles. Also what size exhaust pipe after the turbo is he
running?

Paul, he said "like the one you are going to use".  This means a 89-92.
  Even the Series 5 (1989-1992) will overboost (wastegate not preventing
rise in boost).  The wastegate will work much better if you port it
out.  The engine can handle it, the key is to have enough fuel, the
stock injectors really don't deliver enough for more than about .75
bar.

Port the wastegate out with a dremel tool or increase the size of the
secondary injectors or increase the fuel available via the computer.

Hans

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