streckfu's

I've seen this done before and wanted to ask if anyone as done this. I am looking into tapping directly into the intake manifold with a compression fitting for the line to my boost gauge to get the most accurate reading possible. It looks like the runner going to the #4 cylinder is the staightest path of airflow and likely sees the highest pressure.

Anyone have problems with this?

Porsche-O-Phile

Why not just tee off the existing banjo bolt that's already there?

badcoupe

nope mine always ran off the KLR line, that line also supplies my MAP box. I thought of drilling and tapping the flat spot on the manifold just behind the throttle body. It looks as though it were cast just for that. I would probably use it for my BOV as it takes more volume to open than the small line our cars use to open it.

theedge

LR has double length banjo bolts, so you have have two stacked in the original spot. Drilling and tapping sounds like a big PITA for very little to no benefit.

David Floyd

Or you could use a 5 port vacuum manifold from Laust

streckfu's

I already have a double bajo at the fitting between #3 and 4. I was planning the tap the round runner for #4 since the manifold is off for the head job. The install should be easy. I was just curious if anyone has done it.

hosrom_951

SFR tapped in bottom of the intake manifold (the rear of it) in the European Magazine 951 project.

streckfu's

Actually, that was for the intake temp.

I was planning to do that only to the rear of that runner.

reno808

HMMMMM

streckfu's

Alex, I'll take "Things That Make You Go....." for $1000.

What's your thought?

Jake951

Why not just tap into the KLR line with a tee fitting? It's much simpler. There's no reason the pressure there should be any different than in the manifold itself (unless air is leaking out somewhere between the manifold and the gauge). If there were a pressure difference, air would flow from higher pressure to lower pressure to equalize the difference.

Jakerx

dan, have you thought about using the manifold available from laust?

NZ951

The "best" place to tap is the round flat spot just to the left of the TB. Its a flat area thats big enough to tap and will give you the best chance of sealing because its flat... Though the routing will be longer of course. Dont use the banjo, it would take into account the pressure loss in the IC, you want the manifold pressure.

streckfu's

When I get home, I'll take a picture to show where I am talking about.

NZ, using the engine pic in your signature as the example, I plan to tap at the the #4 runner closer to the firewall (to the left of the flat spot) to catch the air coming toward the fitting instead of tapping farther upstream.

NZ951

You are measuring pressure remember.