Full blend charger boost

[g40josh]

Hi
just wondering what boost people where getting with a full blend charger cheers in advance

[hayesey]

it depends what else has been done to the engine.  Some charger porting on it's own wont do a lot but with a smaller pulley it helps. 

The most you'll get with a g40 g-lader is about 1 bar but if you've done things like added an aftermarket cam or done any head-work then you'll actually see less because the engine is capable of drawing in more of the air the charger is pumping out (which is a good thing). 

boost pressure on a boost gauge is just the back pressure in your inlet manifold that the engine cannot consume fast enough at the end of the day.

[g40josh]

It has 65 mm toothed pulleys on and been told the charger has been ported but only runs 10 psi I thought it was quit low but thought it could be full blend as they run lower boost ?

[Jezza-7]

My spare PSD full blend was running about 12/13psi and my Jabba R1 is running 11/12psi. Thats with German steel 65mm pulleys and I'm on 1341cc, cam, ported head, gt inlet and 51mm tb.

I would of thought you'd be running around 1bar as hayesey says. Is a standard charger around 10 psi?

A few years ago i did once run at 17psi with a completely standard engine with 65mm pulleys. Seemed a bit odd but maybe the gauge was reading badly. Not normal for stack gauges though.

[Agent47]

To compare apples and oranges.
I have a 51mm tb, slightly ported head, gt inlet, shrick cam, and an OBD stage 2 charger and see at best 7 psi. Im pretty certain that this should be a bit more as it feels slower than my jabba stage 2 charger, and that had done 20k miles or more. Problem with different porters, no way to compare. Have to wait and check when I rebuild the jabba one.