Boost gauge line location

**camopaint0707** · 07-29-2013

Where is the best line to tap into in order to install a vacuum/boost gauge on an L67?

**dsmuts** · 07-29-2013

Right by the map sensor

**ILoveAudi** · 07-29-2013

Originally Posted by dsmuts

Right by the map sensor

Where's the map sensor? I was wondering the same because I am still planning on doing a boost gauge after I get the towers fixed

**dbextreme** · 07-29-2013

What I did was remove my MAP and flip it upside down. I put a T off the MAP, one end coming from the port under the supercharger snout and the other end going to my boost gauge. Flipping it seemed to make sense, easier access.. lol

MAP sensor is located back side of the supercharger above the rear valve cover behind the EGR. Google it, should be pics..

**camopaint0707** · 07-29-2013

I tried googling it. But just like the sensor for sale comes up, none on the actual car.

**ItHurtz** · 07-29-2013

between the evap and T on the LIM

**Fivefingerdeathpunch** · 07-29-2013

I win at bing, google sucks.

Number 7.

**camopaint0707** · 07-29-2013

So I need to pull that off then put my T fitting in that?

**BillBoost37** · 07-30-2013

Put your hand under the SC snout. Got the vacuum line, good.. now..put a t into that anywhere and run your gauge hose to it.

Quick, easy, done.

**dbextreme** · 07-30-2013

Just an idea...

Vacuum line off to the right of the map is going to my boost gauge.

**camopaint0707** · 07-30-2013

Thanks bill, the vacuum reading only goes down to about 10 or 11. Is that normal?

**dbextreme** · 07-30-2013

Vacuum for a stock motor should be around 20ish in/hg. Larger cams pull less vacuum, like my XP I see 15 in/hg... 10 or 11 seems LOW for vacuum at idle...

**camopaint0707** · 07-30-2013

I'll take a picture of my tapping into the line but I've done plenty of vacuum gauges before so it should work.

**BillBoost37** · 07-31-2013

It depends on what your gauge is reading. If you got a pound gauge, then 10 is about right. If it's in hg, then it should be nearly 20

**camopaint0707** · 07-31-2013

It's in HG, here is a video of the gauge in action.

**dbextreme** · 07-31-2013

If it's in HG then at idle it should be around 20ish. And after you've gotten off the accelerator it should dip lower then that, say 25ish, and back up to 20. When you stopped it looked like the gauge stopped at 10 and did not go any lower. (also the gauge is jerky in the vacuum area, seems to work smooth in the boost area) Might be a faulty gauge? I doubt you have a vacuum leak, you'd feel that...

**camopaint0707** · 07-31-2013

An old sunpro gauge I have reads the same way.

**camopaint0707** · 07-31-2013

Boost line T-fitting.

**Fivefingerdeathpunch** · 07-31-2013

Originally Posted by camopaint0707

Boost line T-fitting.

Okay guy.

See this picture that you already posted.

The metal thingy with the RUBBER T, on it already is the fuel pressure regulator. Seeing how you already have tapped that line and saw 10in/hgs and boost, of course its still going to read boost. Its a vacuum line thats going to MAP sensor.

A guess at your problem is the Plastic T that you made. Make it back to normal and stick that plastic line into FPR T, see if that makes more than 10 in/hgs. I don't how to explain it any better, don't get confused over simple stuff here.