Quick Gauge Install Question

[errno]

Hey guys,

Just a quick question on installing a boost gauge - just wondering if the place I am putting it in is the correct place or if there is a better hose to T off.

the circle on the left is where I have t'd in to it currently - im pretty sure thats the hose going tot he standard boost gauge. The problem I am having is the boost gauge i bought is very laggy and doesnt meter much above 0 PSI - the factory gauge in the dash goes into positive boost no problem, works fine.

Would the second circle be a better place to T off ? Im pretty sure there are no leaks in the hose, i replaced it with a brand new one.

Also - i have a A/F ratio gauge I want to hook up as well (yeah i know its useless for anythign with a narrow band sensor, and as far as i know the gauge is for narrow band sensors only) but which of the wires from the 02 sensor is the signal ? I assumed the black one was, but it didnt seem to do anythign with the gauge.

Is there a wire I can tap into from the ECU instead ?

cheers

[ashneel]

pretty sure you would have this pipe also but on my R34 this is the vacuum hose that i connected my T to

[QWK32]

personally i wouldn't be teeing anything into the vacuum line for my fuel pressure reg. errno, the one you have tee'd into should be fine. and yes there is a wire at the ecu that you can splice into rather than doing it at the O2 sensor.

check this pdf out. i know its for something different but if you go down to page 2 and look at the ecu pinout pic N4-a, it tells you where the O2 sensor wire is.

http://paulr33.skylinesaustralia.com/diagr...ing_diagram.pdf

Edited February 26, 2009 by QWK32

[JMW]

I just ditched the factory boost guage sender and plumbed mine into where the factory one came off.

+1 for not t-ing into the fpr line.

[errno]

personally i wouldn't be teeing anything into the vacuum line for my fuel pressure reg. errno, the one you have tee'd into should be fine. and yes there is a wire at the ecu that you can splice into rather than doing it at the O2 sensor.

check this pdf out. i know its for something different but if you go down to page 2 and look at the ecu pinout pic N4-a, it tells you where the O2 sensor wire is.

http://paulr33.skylinesaustralia.com/diagr...ing_diagram.pdf

is the fuel pressure regulator the hose that ashneel has t'ed into? any idea why the place where I t'd my gauge into would be making my gauge not read must over 0 (apart from a leak - but there shouldnt be a leak as the factory gauge still moves normally)

Thanks for the diagram - that will make it heaps easier to splice into

[JMW]

Gauge could be cactus? Is it reading any vaccum? What type of gauge? New or second hand?

And yeah thats the fuel pressure regulator line.

Edited February 26, 2009 by Jamesrb25

[errno]

Gauge could be cactus? Is it reading any vaccum? What type of gauge? New or second hand?

And yeah thats the fuel pressure regulator line.

its a new gauge just a cheap ebay one - it reads vacuum, but its a lot laggier than the factory one and doesnt go into pressure. Ill go straight from where the factory gauge hooks up to the plenum and not T- it in and see if it makes a difference, maybe the sensor is DOA, lol

[QWK32]

yes the one that ashneel has pictured is tee'd into the FPR.

does it have a compression fitting on the back of the gauge for the vacuum line? the type with a small copper piece that slides onto the tube before doing it up on the back of the gauge. if it does you may have crushed the tube doing it up too tight.

[JMW]

Yeah give it a shot from there. If not grab someone with a compressor and a blow gun, lenght of hose, and gently increase pressure from compressor and see if it matches what is on your boost gauge. Do this slowly and carefully as you dont want to blow your boost gauge. There will be a few psi drop through the compressor hose, but not much. This will tell you if the gauge is a dud or not atleast.

[errno]

yes the one that ashneel has pictured is tee'd into the FPR.

does it have a compression fitting on the back of the gauge for the vacuum line? the type with a small copper piece that slides onto the tube before doing it up on the back of the gauge. if it does you may have crushed the tube doing it up too tight.

the sensor is separate from the gauge and has a fitting like the T pieces

ill try not t-ing it and if thats no good ill test it with a compressor thanks guys