boost pressure

What should a 300 tdi boost at ?

1 bar fit a boost guage very easy job

Depends where you fit read it from... they lose about 5 PSI through the intercooler!

From the wastegate its around 14psi, about 9 from the inlet IIRC...

Hello,

Jason from Sydney here. I have just fitted a boost gauge. General forum concensus was that I should measure it on the inlet manifold, nad there was a connection point at the rear.

I was wondering what sort of pressure readings I should expect when measuring at the rear of the inlet manifold?

Note: I get zero Bar at idle and 100kpa at max boost. It never goes negative. The 1Bar value seems a bit too tidy? Is this because the waste gate opens at 1Bar ?

My gauge runs just a smidge above a bar. I fitted mine on the hose that runs from gate to fuel pump. You'll never see negative pressure as its not a dump valve and they run at a bar because thats what they run at,no fancy valves getting rid of excess boost. It you nedd more you can shorten the acuator arm,but you'll need to cut some of the thread off to make a real difference.
On a side note a no cat,with straight through middle exhaust does seem to help the turbo spool up quicker.

Hello MPfive,

I took my gauge off the inlet manifold. There is an M10 1.5 pitch plug at the bulkhead end of my 1995 300 tdi just visible from the photo (perfect for the connection with a few adaptors). I get a smigion over 1 Bar.

Where is this actuator arm located that I hear so much about please?

Its pretty much under the exhaust manifold. Looking in from the left at the turbo you should just about see it.

Thanks for the info.

Is it something I can remove seperately without having to remove turbo or exhaust manifold ?