Boost pressure

[Sweety]

On a 2.7TDI T2 am I right in thinking the standard boost pressure should be around 0.9bar / 12-13psi ? The reason I'm asking is my old gauge used to show 1.2bar but the new gauge is showing 0.75bar:eek::doh now I'm sure the old gauge was over reading a bit & at time would get to 1bar then jump to 1.2. What I noticed when fitting the new gauge was the T that came with it had a brass insert with a tiny hole in it on the part that the hose fits on to go to the gauge but the old T didn't have this so was wondering if the full boost pressure isn't reaching the gauge::nenau if it makes any difference the new gauge uses 3mm ID hose where the old one had 3mm ID 3.5" long which went into a brass fitting & had 1mm semi ridged pipe coming out of it to the gauge only thing I can think of is poss swapping over the It's to see if that makes any difference:augie

[Sweety]

Well changed the T piece & the readings are still the same so must have a gauge that likes to under read:doh was going to tweak the boost a little but the lock nut is stuck fast so was scared to keep trying in case I bent the rod:augie what's the best way of doing it hold the rod with a pair of vice grips whilst slackening the lock nut:nenau & how many turn of the rod will I need just want to up it a bit but not to the point I start to run lean fuel wise

[Banshee]

Well changed the T piece & the readings are still the same so must have a gauge that likes to under read:doh was going to tweak the boost a little but the lock nut is stuck fast so was scared to keep trying in case I bent the rod:augie what's the best way of doing it hold the rod with a pair of vice grips whilst slackening the lock nut:nenau & how many turn of the rod will I need just want to up it a bit but not to the point I start to run lean fuel wise

Dude get some pics up and that, I want to do this mod

[rustic]

I fitted a boost gauge to mine, but there was quite a lot of turbo noise transmitted to the dial assembly, so I fitted a restrictor in the line to the meter, and this stopped the noise, and didn't affect the meter accuracy, or speed of response.
So maybe this answers the query of why a plug with a fine hole was fitted on one of your meters. :nenau

[Banshee]

I fitted a boost gauge to mine, but there was quite a lot of turbo noise transmitted to the dial assembly, so I fitted a restrictor in the line to the meter, and this stopped the noise, and didn't affect the meter accuracy, or speed of response.
So maybe this answers the query of why a plug with a fine hole was fitted on one of your meters. :nenau

Different with yours though bud as you just "T" piece off the vac pipe near the actuator don't you?

The TDi's are different but I really want to fit one

[rustic]

Different with yours though bud as you just "T" piece off the vac pipe near the actuator don't you?

The TDi's are different but I really want to fit one

Yes I "T'd" off the small pipe that connects to the aluminium pipe that has TURBO on it. No intercooler on mine.

[Banshee]

Yes I "T'd" off the small pipe that connects to the aluminium pipe that has TURBO on it. No intercooler on mine.

You've got the easy life, it's a lot more involved with the TDi I'm led to believe :doh

[solarman216]

the small hole on the tee piece is simply to make the gauge read steady rather than jump about, adjusting the waste gate spring will not alter the pressure, it will just raise the pressure that the gate opens and that is only at the extreme end of the range, if your pressure is low then it may be that the waste gate is leaking, or the turbo is goosed, but if performance and mpg are good then why worry, Rick

[Banshee]

the small hole on the tee piece is simply to make the gauge read steady rather than jump about, adjusting the waste gate spring will not alter the pressure, it will just raise the pressure that the gate opens and that is only at the extreme end of the range, if your pressure is low then it may be that the waste gate is leaking, or the turbo is goosed, but if performance and mpg are good then why worry, Rick

I think it's just the novelty Rick :thumb2 That's why I want to do it anyway

[Sweety]

the small hole on the tee piece is simply to make the gauge read steady rather than jump about, adjusting the waste gate spring will not alter the pressure, it will just raise the pressure that the gate opens and that is only at the extreme end of the range, if your pressure is low then it may be that the waste gate is leaking, or the turbo is goosed, but if performance and mpg are good then why worry, Rick

TBH Rick don't think there is any problem with the turbo as it pulls well & it's only done 61K, just the gauges are giving different readings:doh

[rayf3262]

I once checked a pressure gauge by inflating a tyre to a known pressure, then used an old inflator adapter to connect the tyre to the gauge under test....

[Lazy-Ferret]

I once checked a pressure gauge by inflating a tyre to a known pressure, then used an old inflator adapter to connect the tyre to the gauge under test....

That's how I reset my one back up after taking it all apart to change the lighting inside it.

I used the trailer tyre, set it to 10PSI (My gauge is in PSI) with the tyre gauge, checked the meter before I took it apart, then once all back together, I connected it to the tyre before putting the needle back on. Seemed to work fine.

[Sweety]

Great idea guy's i'll have to dig out some tubing & an adaptor :thumb2

[Sweety]

Dude get some pics up and that, I want to do this mod

Here you go Banshee pic of it plumbed into the turbo

[Sweety]

Closer pic:augie

[Banshee]

So you've got the pipe going of the actuator and then T pieced it further down to re-attach the original actuator pipe?

[Sweety]

I replaced the factory actuator pipe with blue silicone pipe & just cut it to fit the T into it for the gauge as I wanted my reading from the turbo:augie