Just purchased an Autometer boost gauge last Sat and tried to hook this up last Sun. I couldn't figure it out what size tube I suppose to use. First of all, I hooked up with the 1/8 tubing that they came with ,and noticed that I could only get 6lbs of boost the max on 3rd gear at 4000>5000 rpm. I knew it was something wrong. Then looked up scoodymods.com and mattrandolph.com, see how those guys did theirs, but get confused even more. So please help and advise me with where should I buy the T-fitting, size of tube, how long and how to hooked this up right. I really want to do it myself, so I learn more about the car. Thanks..

 

I bought a box of plastic vacuum T's from Autozone. I think they were about $2. I also bought some extra vacuumm tubing that was the same size as the stock. Not really sure of the size, probably 1/4. I disconnected the line going to the BOV and put the T there, then cut a short piece of new tubing, about 3", and hooked one end to the other side of the T and the other end back to the BOV. I then cut about 12" of tubing and hook it to the remaining part of T. Take the plastic tubing that comes with gauge and slide it inside the 12" piece of rubber tubing, it helps to lubricate it either with spit of WD40 so that you can slide it in all the way. Then put a couple of zip ties on either end of the tubing to hold he plastic tubing inside the rubber. Feed the other end of the plastic tubing inside the car through the existing rubber grommet behind the intercooler on the fire wall and feed it up the gauge and connect.

Mostly likely the reason for you only being able to hit 6psi of boost is a problem with the plastic tubing. If it gets kinked anywhere it will not give you accurate readings. Some people like to replace to plastic tubing with rubber tubing. I have never done this, if you are careful with the plastic tubing you will be fine. I have installed numerous boost gauges this way for many different cars and never had a problem.

 

Yup, this is what I did as well. The shop I bought my gauge from (TwinCam Motorsports in Concord) recommended the rubber hose in the engine compartment because the nylon might not hold up with the heat. I agree, the nylon can be kinked very easily and therefore can screw up your boost reading.

I constructed my t-valve from brass fittings purchased from Home Depot.

http://forums.nasioc.com/forums/show...hreadid=417931

 

GR8-WRX
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