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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 19th, 2019, 18:44   #1
sdean7855's Avatar
Join Date: May 2006
Location: Kingston, NY
TDI(s): 2003 Jetta
Fuel Economy: 65/45
Default Where to tap into intake manifold for Boost gauge?

Suggestions for an '03 ALH engine?
2003 Jetta TDI, 1998 Original Mini
Previous cars:
  • 1998 VW Golf VR6 GTI, Garrett Chip, Shine Suspension, bagged by a deer one rainy midnight, *&%$ insurance people totalled it
  • 1985 VW Golf GTI
  • 1975 (or so) VW Golf Diesel, much grief, finally stuck a Weber carburetted Scirocco engine in, HOT!
Rides of my Youth:
  • 1929 Type 40 Bugatti
  • 1932 Type 49 Bugatti
  • 1960 3.5 Liter Maserati GT (a chipped VR6 mill is a match of the Maserati mill)
  • English Ford Anglia
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Old November 19th, 2019, 18:52   #2
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Join Date: Apr 2015
Location: Florida
Fuel Economy: Better than a tank, worse than a cyclist.

I tapped into my plastic boost pipe. Easier to drill/safer. It's right in line with my VCDS boost readings.
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Old November 19th, 2019, 20:43   #3
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Join Date: Mar 2011
Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg

wherever the metal is thickest. I would also do it on the plastic section as it's much easier to repair
I highly suggest auber gauges.
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Old November 19th, 2019, 21:41   #4
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Join Date: May 2016
Location: Nashville, AR

You could always do an egr delete and use the pressure tap that most of them have

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Old November 20th, 2019, 11:01   #5
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Join Date: Oct 2011
Location: Monroe, NY, USA

I taped mine in the intake manifold when I had it off for cleaning.
I taped it near cylinder 4 which might not have been a good spot.
I had a buzzing in the gauge when I took off.
After a few weeks it went away because the adapter hole got plugged with soot. Gauge still worked.
Next time I may try closer to cylinder 1 or possibly in the EGR valve.
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Old November 20th, 2019, 14:10   #6
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Join Date: Sep 2011
Location: Chatsworth, CA
Fuel Economy: 40-ish

This is a dandy spot and is good for a 10-32 thread size to 1/8" hose nipple.

Just the right size for a 1/8" pressure gauge hose and convenient to get to.
2002 Jetta GLS TDI wagon
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