abdr500

iTrader: (1)

what should a /34 actuator hold if adjusted right coz i cant seem to hold any more than 1.5 bar but will over boost but will not hold any more than just 1.5 i ve put a bleed valve on it does the same thing i can make it over boost to 2 bar but goes strate back to 1.5

abdr500

iTrader: (1)

Christian and Beccy

iTrader: (14)

Sounds like an Air Leak to me. I can have held nearly 2 Bar on a -34, so there must be something wrong.

I would imagine that there is a hose clip loose somewhere or perhaps a gaping hole in your Intercooler.

Karl

A T34 with 0.48 exhaust housing and non cut back turbine wheel will only manage to hold 1.5 bar higher in the revs on a good cosworth engine.

This is down to increasing back pressure due to the restrictive turbine housing and wheel and the fact the engine consumes more air than the turbo can supply to give any more top end boost than 1.5 bar.

PGT

karl - i have t34 (cut back blades) with 63 housing, cams and mildly ported head, greys, 7.2cr etc, and boost is 2 bar between say 3.5-5.5k but drops to 1.5bar later. when you talk about 'holding boost' what exactly does that mean? is it a spike of say 1 second or what is this *spike*, cos mine is stable at whatever rpm we are talking but simply drops off later in the rev range. the engine has been live mapped as well.

abdr500

iTrader: (1)

Karl, i was thinking that but couldent put it in words but even if i did coz it came from me people would of siad iam talking shit