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Old 01-16-2011, 08:52 AM   #1
jh.
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Default DIY - Boost gauge in 11' STI

I didn't know if there was one, so I just made one....

DIY - Installing a boost gauge into a 11' STI

1. Started off with the wiring from the gauge. Decided to do it right and keep it clean.

So I used fuse taps and heat shrink.



After 3 more, the black wire is GROUND.....



2. Next is to take off the intercooler.
- 2 bolts on either end the intercooler
- 2 breather hoses on the left side
- 1 breather hose on the right
- 2 bolts for the BPV
- 2 hose clamps (throttle body and turbo)



3. Time to run the wires through the fire wall. I first started with the correct way, through the gromet, but had
a hard time. So I went through the heater core hose gromet. Make a slit or a hole and push it through. It will come out
just to the right of the gas pedal.



Excuse the ugly looking slit, but I pushed in the little flap when I was finished. It looks better and protects the
wire from the sharp edges.

The final product of the solenoid and wiring all wired up and tied in nicely.



4. Next is to reinstall the intercooler. Then install the "T" tap for the vacuum source. Creativity comes in now...



5. Now route your vacuum line from the solenoid to your "T". As you can see I followed the brake booster vacuum line.



6. Next we fiddle with the wires and which fuses to use...

Constant 12v - Fuse # 3
Switched 12v - Fuse # 24
Illumination/Dimmer - Fuse # 16



Ground is ground...I used the bolt holding the dash to the firewall on the left side of the dash. Easier than the one
tucked behind the fuse panel.



7. Now mount your gauge where ever you like. I mounted mine on the left side of the cluster.

I routed the electricals through the steering column. I hid the peak/warning button in the fuse panel cover.

Now plug everything in and tie all your wires up nicely.

Wahhhhllllaaaa and your done.

Night shot...Ill get a day one tomorrow!

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Old 01-16-2011, 09:14 AM   #2
xluben
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Any chance you can get a video of the startup sequence, both straight to on, and one where you stop at ACC until it does a sweep? Good write up, BTW.
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Old 01-16-2011, 09:17 AM   #3
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Quote:
Originally Posted by xluben View Post
Any chance you can get a video of the startup sequence, both straight to on, and one where you stop at ACC until it does a sweep? Good write up, BTW.
Sure ill try it out tmr. So on the second vid, you want me to turn to ACC and wait for the sweep to stop. Then start the car and see if it does the sweep again?
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Old 01-16-2011, 11:33 AM   #4
waramp
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Nice j!

When you coming out to a meet

Last edited by waramp; 01-16-2011 at 11:48 AM.
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Old 01-16-2011, 03:27 PM   #5
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Quote:
Originally Posted by waramp View Post
Nice j!

When you coming out to a meet
Thanks!

Ill try to make it out whenever there is one.
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Old 01-16-2011, 05:55 PM   #6
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Quote:
Originally Posted by jh. View Post
Sure ill try it out tmr. So on the second vid, you want me to turn to ACC and wait for the sweep to stop. Then start the car and see if it does the sweep again?
Yes, exactly! Thanks!
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Old 01-16-2011, 10:57 PM   #7
cabikejumper
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Very nice
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Old 01-16-2011, 11:04 PM   #8
jh.
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Alright videos are done. What can I use to upload them? Something free without registering...all that bs
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Old 01-17-2011, 08:37 AM   #9
xluben
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Just get a Photobucket account. Then you can actually go back and find your stuff later, and it won't just disappear someday. Free and easy to register.
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Old 01-17-2011, 11:35 AM   #10
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Quote:
Originally Posted by xluben View Post
Just get a Photobucket account. Then you can actually go back and find your stuff later, and it won't just disappear someday. Free and easy to register.
Damnit! im too lazy to register haha, I guess I have to. BTW it does not sweep again nor reset. Everything works the way it should.
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Old 01-17-2011, 11:45 AM   #11
Sp2Pilot
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Was removing the intercooler absolutely necessary? Or did it just make it a little easier to get to the firewall grommet?
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Old 01-17-2011, 07:29 PM   #12
waramp
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Where's the cheapest place to get those fuse taps?
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Old 01-17-2011, 07:38 PM   #13
nighthawk06si
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awesome diy!!
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Old 01-17-2011, 09:22 PM   #14
jh.
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Quote:
Originally Posted by Sp2Pilot View Post
Was removing the intercooler absolutely necessary? Or did it just make it a little easier to get to the firewall grommet?
Yes it is absolutely necessary to remove the intercooler. It is very easy to remove. I had a very very hard time going through the factory gromet hole. So I went through the heater core gromet. Im a mechanic so I know where to go through.

Quote:
Originally Posted by waramp View Post
Where's the cheapest place to get those fuse taps?
Cheapest would probably be somewhere online...like those uber cheap electronic parts websites.

I got mine at lordco (work discount). Canadian tire has them too, but they charge an arm and a leg

Quote:
Originally Posted by nighthawk06si View Post
awesome diy!!
Thanks! Videos will be up!
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Old 01-17-2011, 09:47 PM   #15
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http://s1135.photobucket.com/albums/m628/jordanhsieh/?action=view&current=1.mp4
http://s1135.photobucket.com/albums/m628/jordanhsieh/?action=view&current=2.mp4
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Old 01-17-2011, 10:17 PM   #16
xluben
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Quote:
Originally Posted by Sp2Pilot View Post
Was removing the intercooler absolutely necessary? Or did it just make it a little easier to get to the firewall grommet?
Quote:
Originally Posted by jh. View Post
Yes it is absolutely necessary to remove the intercooler. It is very easy to remove. I had a very very hard time going through the factory gromet hole. So I went through the heater core gromet. Im a mechanic so I know where to go through.
Hope you don't mind the thread jack, but it depends on what grommet you go through as to whether or not you have to remove the intercooler. I ran mine through a grommet in the fender and I found it to be very easy. Photos and description can be found here (not my post):

http://forums.nasioc.com/forums/show...07&postcount=6

You don't have to remove anything in the engine bay or cabin. But you do have to open up the fender liner. I jacked up my car and took off the tire to give myself more room. Once I had it open it was probably the easiest routing of wire through a firewall that I've ever done.

Quote:
Originally Posted by jh. View Post
Thanks! Videos will be up!
Thanks for the video! My car definitely doesn't function like yours when I stop at the ACC position, it fully turns off and back on once I turn the car on. On the plus side, when I stop at the ACC position the Defi sweeps at nearly the exact same time as the OEM gauges.

Can you confirm this is how you wired yours?

Quote:
Originally Posted by jh. View Post
Constant 12v - Fuse # 3
Switched 12v - Fuse # 24
Illumination/Dimmer - Fuse # 16
My power wires are set up the exact same as yours, but my Illumination wire is going to fuse #14. The dimmer function seems to work fine, so I don't think that's the issue. What do you think my problem could be? Is the WRX wired differently than the STI (I don't think this is the case)? Or maybe the Defi always does that (I don't think this is the case either)?

Constant 12v - Fuse # 3
Switched 12v - Fuse # 24
Illumination/Dimmer - Fuse # 14
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Old 01-17-2011, 10:24 PM   #17
jh.
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Constant 12v - Fuse # 3 - DOOR LOCK
Switched 12v - Fuse # 24 - AUDIO UNIT
Illumination/Dimmer - Fuse # 16 - ILLUMINATION

Are the WRX's fuses the same?

Also can you tell me how many wires you need to connect from your defi harness?

On my STRI harness I have 4 wires to connect.
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Old 01-17-2011, 11:16 PM   #18
xluben
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Yes, those fuses are all correct. I moved my Illumination wire to Fuse #16 and it still does the same thing. My gauge is wired up just like yours.

My car does only have 3 wires + ground. Does yours have an additional wire? What is it for, and what is it connected to?
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Old 01-18-2011, 01:54 AM   #19
jh.
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Nope I also have 3 wires + ground.

Constant 12v
Switched 12v
Illumination
Ground

Are you running the BF series or the one where you need the brains too?

Can you shoot a video?
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Old 01-18-2011, 08:18 AM   #20
xluben
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I have the red racer. No control unit needed. Just plug into the back of the gauge.

I will try to shoot a video tonight. What I am seeing is exactly how people described the double sweep on the older cars when they wired Defi gauges into the ACC line instead of the IGN line.
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Old 01-18-2011, 11:21 AM   #21
foolycooly
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anyone have any experience installing the SPT boost gauge? I wasn't able to get it on my '11 wrx due to backorder, but am interested in purchasing it and getting it installed through the dealer. Any idea how much labor would run me?

Thanks.
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Old 01-18-2011, 07:31 PM   #22
xluben
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I found this link, and it looks like it is describing the solution to my exact problem:

http://legacygt.com/forums/showthrea...86#post3172286

It says to use Fuse #26 for the IGN activated signal.

So, this is how I had it wired up before:

Quote:
Originally Posted by jh. View Post
Constant 12v - Fuse # 3 - DOOR LOCK
Switched 12v - Fuse # 24 - AUDIO UNIT
Illumination/Dimmer - Fuse # 16 - ILLUMINATION
The boost gauge would sweep when I turned the key to the 2 position (the OEM gauges don't sweep until the 3 position), and then again when I turned the car on.

Then based on the post from LegacyGT, I changed the orange wire to the IGN fuse:

Quote:
Originally Posted by jh. View Post
Constant 12v - Fuse # 3 - DOOR LOCK
Switched 12v - Fuse # 26 - IG2
Illumination/Dimmer - Fuse # 16 - ILLUMINATION
Now the boost gauge does the sweep right along with the OEM gauges with the key at position 3.

BUT the gauge still turns off and sweeps again once I turn the car on!

So the new fuse definitely changed something (the gauge turns on at a different key position now), but it still doesn't function how I think it should. I think I'm about to give up. It doesn't affect how the gauge actually functions, it's just the startup sequence.
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Old 01-18-2011, 08:49 PM   #23
jh.
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I think its a gauge problem. Is it actually losing power and resetting or just double sweeping?
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Old 01-18-2011, 08:50 PM   #24
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Quote:
Originally Posted by foolycooly View Post
anyone have any experience installing the SPT boost gauge? I wasn't able to get it on my '11 wrx due to backorder, but am interested in purchasing it and getting it installed through the dealer. Any idea how much labor would run me?

Thanks.
There was a recall? or a problem with the factory boost gauges. FYI it only reads up to 20psi, so if you plan on boosting more Id get another gauge.
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Old 01-18-2011, 09:37 PM   #25
xluben
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Quote:
Originally Posted by jh. View Post
I think its a gauge problem. Is it actually losing power and resetting or just double sweeping?
It restarts once you crank the engine. I made a video, and I'm uploading it now.

First part of the video I stop at position 3. OEM gauges and boost gauge all do the sweep. Then I crank the engine and the boost gauge restarts and sweeps again.

Second part I immediately start the engine. Boost gauge only sweeps once, but it is not in sync with the rest of the gauges.
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