Mr. Electric Wizard Posted March 7, 2022 Share Posted March 7, 2022 Has anyone found a good place to pass wires through the firewall on a 4th gen Legacy with a manual transmission? I need to install an AEM wideband in the cubby at the top of the dash. I'd rather not drill through the firewall if I can keep from it. Thanks! Link to comment Share on other sites More sharing options...
cheeseenlo Posted March 7, 2022 Share Posted March 7, 2022 All my wiring is going above and through the driver wheel arch liner going towards the interior fuse box. You can route everything across to the battery / fuse box areas where you'll see a small opening. You'll be able to access the wiring if you pull down the liner slightly which will expose the grommet. You'll need to enlarge the grommet slightly to pass all the cabling. All of my sensors (wideband, oil pressure, oil temp and boost) take this pathway from the engine bay to the cubby. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 7, 2022 Author Share Posted March 7, 2022 Awesome! Thanks for the reply! I CAN DO IT! HA! Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 7, 2022 Author Share Posted March 7, 2022 (edited) All my wiring is going above and through the driver wheel arch liner going towards the interior fuse box. You can route everything across to the battery / fuse box areas where you'll see a small opening. You'll be able to access the wiring if you pull down the liner slightly which will expose the grommet. You'll need to enlarge the grommet slightly to pass all the cabling. All of my sensors (wideband, oil pressure, oil temp and boost) take this pathway from the engine bay to the cubby. Did you tap into the radio power wires for your gauge power or something like the cigarette lighter? Edited March 7, 2022 by Mr. Electric Wizard Link to comment Share on other sites More sharing options...
Haze Posted March 8, 2022 Share Posted March 8, 2022 Another option: I ran mine through the grommet with the ECM wiring in the passenger side foot well. It's shorter but you need to make sure your wiring won't touch the turbo or downpipe. I wrapped my wiring in split loom tubing and wrapped that in foil tape as an extra precaution. Link to comment Share on other sites More sharing options...
cheeseenlo Posted March 8, 2022 Share Posted March 8, 2022 Did you tap into the radio power wires for your gauge power or something like the cigarette lighter? The power for the sensor comes from a switched 12v fuse which I tapped using an Add-a-fuse kit. I didn't want to cut any of my wiring. I forget exactly which fuse I used but you could easily use a volt meter to verify. If adding multiple sensors, it's best to use the same source. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 9, 2022 Author Share Posted March 9, 2022 Do those add a fuse kits still allow for the fuse box cover to still fit on? Link to comment Share on other sites More sharing options...
seanyb505 Posted March 9, 2022 Share Posted March 9, 2022 I also went through the passenger side. Made sure to zip tie wires to the fire wall and other fixed sources. For the fuse, I tapped into the cigarette lighter as I never use that. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 9, 2022 Author Share Posted March 9, 2022 Thanks! Now, correct me if I’m wrong but a 2005/6 cannot have the wideband integrated into the harness like a later model? You can’t use an AEM wideband and data log with an AccessPort like you could with say a 2008? Link to comment Share on other sites More sharing options...
Infosecdad Posted March 9, 2022 Share Posted March 9, 2022 Depends what you mean by "integrated into the harness". I'm logging a wideband through a reclaimed TGV plug, but you would need to delete your TGVs to do that. Link to comment Share on other sites More sharing options...
whitexc Posted March 9, 2022 Share Posted March 9, 2022 Your wide band is it own sensor, placed in a exhaust bung is it not? Typically used for tuning on a dyno and or monitoring. The good thing with a wide band is seeing live time events go through the gauge between a digital readout and the sweeping color dial and also not pegging at 11.14 like the factory O2/AP combo. I don't see how that would integrate into the vehicle harness and tie into the AP, unless I am thinking of something different..... Info....how are you logging/tuning? Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
Code Posted March 9, 2022 Share Posted March 9, 2022 Depends what you mean by "integrated into the harness". I'm logging a wideband through a reclaimed TGV plug, but you would need to delete your TGVs to do that. It can be integrated into the ECU by utilizing any available 0-5v input (TGV or MAF) and a custom field in the AP. "Striving to better, oft we mar what's well." - Bill Shakespeare - car modder Link to comment Share on other sites More sharing options...
Infosecdad Posted March 9, 2022 Share Posted March 9, 2022 (edited) Your wide band is it own sensor, placed in a exhaust bung is it not? Typically used for tuning on a dyno and or monitoring. The good thing with a wide band is seeing live time events go through the gauge between a digital readout and the sweeping color dial and also not pegging at 11.14 like the factory O2/AP combo. I don't see how that would integrate into the vehicle harness and tie into the AP, unless I am thinking of something different..... Info....how are you logging/tuning? Sent from my SM-G996U using Tapatalk As Code mentioned, you can reclaim an input that's looking for a 0-5v signal. I'm logging via a custom field in BtSSM and I'm open source tuned. The ECU itself doesn't use it, but you can monitor with custom fields. Edited March 9, 2022 by Infosecdad Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 9, 2022 Author Share Posted March 9, 2022 Your wide band is it own sensor, placed in a exhaust bung is it not? Typically used for tuning on a dyno and or monitoring. The good thing with a wide band is seeing live time events go through the gauge between a digital readout and the sweeping color dial and also not pegging at 11.14 like the factory O2/AP combo. I don't see how that would integrate into the vehicle harness and tie into the AP, unless I am thinking of something different..... Info....how are you logging/tuning? Sent from my SM-G996U using Tapatalk My tuner said that just a phone video of the gauge itself while logging with a specific set of gauges on the AP would be good enough. The reason I was asking about integration into the harness was based on some comments I’ve seen online, but those were for later year model cars. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted March 25, 2022 Author Share Posted March 25, 2022 Another option: I ran mine through the grommet with the ECM wiring in the passenger side foot well. It's shorter but you need to make sure your wiring won't touch the turbo or downpipe. I wrapped my wiring in split loom tubing and wrapped that in foil tape as an extra precaution. Through here, with all the ECU wiring? Link to comment Share on other sites More sharing options...
Haze Posted March 25, 2022 Share Posted March 25, 2022 Through here, with all the ECU wiring? Nope, lower and further inboard. You pretty much have to be under the car to see it. Maybe my memory is foggy on what exactly ran through there originally but if you remove the ecu tray under the carpeting, it's right there. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted April 10, 2022 Author Share Posted April 10, 2022 Thanks for the info about the passenger side foot well. I ended up going through that same grommet but since mine is a Limited, and this grommet is where the drain line goes. I was able to pull the wires through there by just removing the drain line, passing the connector through, then putting the drain line back through. Worked awesome. Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted April 10, 2022 Author Share Posted April 10, 2022 Quick question, as I've never had one of these gauges. I finally got my gauge installed and my car fired up (no tune yet but coming soon). The gauge reads 14.6 at idle but when I step on the gas (in neutral) it quickly goes up then shows --- (three dashes). Does this mean that it is going off the charts lean? Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted April 10, 2022 Author Share Posted April 10, 2022 After playing with it a bit more this seems to be the case. If I gently blip the throttle it plays nice and the numbers go up a little and down a little but when I rip the pedal, it goes up to a high number and then --- which I assume is LEAN AF. Tune-time. Link to comment Share on other sites More sharing options...
Underdog Posted April 10, 2022 Share Posted April 10, 2022 Yes that’s correct. Generally speaking it’s normal for the car to go full lean under no load & decel/falling revs. If it’s going lean under cruise/load then you have a problem. The Crimson Dynamo Link to comment Share on other sites More sharing options...
Mr. Electric Wizard Posted April 10, 2022 Author Share Posted April 10, 2022 I do have a larger turbo, which is probably another reason for it. Not going to drive it until it’s tuned but I was curious more than anything. The gauge is very neat to watch. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now