Agent-Orange

I'm slapping a boost gauge in my Jackson supercharged NA. Where's the best place to tap into under the hood to get my boost reading?

WigglingWaffles

Just before the throttle body is probably the most accurate.

acedeuce802

iTrader: (1)

Only if you don't want to read vacuum.

Just pick a port, don't make it the same port that your ECU reads off of, assuming you have a MAP based ECU. The ECU matters where it gets the signal from, because some ports have more noise than others, but a boost gauge will be fine on any.

Braineack

iTrader: (62)

why? (He has a JR s/c so he doesn't have an ECU) but again, why?

acedeuce802

iTrader: (1)

I thought I've heard that the MAP signal is cleaner when it's on it's own circuit, maybe not. If you have multiple ports on the IM, why not just use a dedicated port instead of using a tee?

Braineack

iTrader: (62)

because, why run two vacuum lines into your bay?

tee off the clean FPR line. Tee inside the cabin to the ecu and boost gauge. all the available dedicated ports off the IM are nasty for an ECU.

acedeuce802

iTrader: (1)

Actually I'm now remembering that's what I did as well.. disregard my original advice!

Agent-Orange

I'm running MS. No ECU.

Anyway, I think I should be good for boost & vacuum reading if I T into the cruise control vacuum line on the back of the IM, right?

hi_im_sean

iTrader: (3)

EBC or things that modulate the vacuum load will cause havoc on the map sig, ask me how I know. But a guage should be fine.

Schroedinger

My first install, I teed both the ECU and the boost gauge off of the FPR line. The ECU signal was noisy as **** from all the vacuum lines vibrating in the engine bay and the cabin. I kept the ECU feeding from the FPR, and moved the boost gauge feed to one of the nubbies behind the throttle body. No more noisy signal.

Agent-Orange

Tried it off cruise control vacuum line as well as the unused port right behind the TB. I get no reading

Agent-Orange

I tried the cruise control vacuum line & the 1st post on the front right of the IM as it is unused & neither gave me a reading.

acedeuce802

iTrader: (1)

What boost gauge is it?

Agent-Orange

Glowshift

acedeuce802

iTrader: (1)

Mechanical or electronic?

Agent-Orange

Mechanical

acedeuce802

iTrader: (1)

blow or suck on the hose. If it doesn't move, your boost gauge is broken.