AEM Wideband Failsafe Gauge
 

I have bought an AEM Wideband Failsafe Gauge to fit to my GT 86, together with the AVO turbo kit I am having fitted. Has anyone with this gauge made use of the wideband failsafe feature? If so, how have you done it?

Dave

You need a Boost controller that accepts a signal with the output the AEM gauge has (I believe its between (0.5-1.5V)

Thank you for your prompt reply.

I am now probably opening myself up for scorn and ridicule, but could you please give me some more advice on this? (Total FI noobie, I am afraid). This is what is being done to my car for boost control (from the installers spec sheet): Electronic closed loop boost control via Ecutek.
By your reply, I guess I would need to have a separate boost control, or will an electronic boost control be fitted in order to use the Ecutek control?

The one you are getting is just a boost solenoid that the ECU will be able to control. I can't point you exactly to one, but I believe in the AEM site, they give examples of which ones work. Someone here will probably will help you out more than me on that :( I am also planning on using the Subaru type EBCS

Go to page 15 of the product instructions http://www.aemelectronics.com/Images...%2030-4900.pdf and it will show you how to wire up the gauge so that it interrupts the boost control solenoid signal.

http://www.ft86club.com/forums/attac...1&d=1374960611

Instead of a separate box to control the solenoid, the wire going to pin 30 of the relay will I presume be under ECU or main relay control. It depends how the circuit works.

Now that I have an EBC, I may consider buying a relay and giving this a shot. While my EcuTek tune already has a boost cut, and the EBC also has a max boost setting that will return it to wastegate pressure if it gets hit, the AEM Failsafe also lets you drop the boost if your AFR exceeds a threshold.

Hi Chris,
Where the hell does this green wire go? Haha! I'm so stuck. I've been told that my car wiring is just a mirror image of the FRS but I can't find this thing.

Under my glove box I have a black box with four plugs into it which I assume is the ECU. But it's chocked full of wires and everywhere I've seen it wired in has quite a lot of gaps around it.
Attachment 48969

Next I have a double connector, but doesn't seem to have a grey wire in it.
Attachment 48968

Lastly I have a connector up right near the fire wall. But I can't see enough of it or get at it to see if it has a grey wire in spot 17.
Attachment 48970

That's all that's under there!
HELP haha!

On another note I pulled the log of the gauge even though it's not reading RPM. The boost versus time is showing that I'm running vacuum 99% of the time. Which is wrong. I checked an the vacuum lines are still in and I don't think I have a leak anywhere. The car is driving the same as it was just I'm no longer showing boost on the gauge.

I think the non US cars do not have the same Certification ECU box that my car has. The other option is the A35 Pin 15 Connector with Gray/Red wire on the ECU itself. Check this link to help you find it:

http://www.ft86club.com/files/BRZwiringi.pdf‎

Where did you tap into to get the vacuum signal to hook up the line that goes to the gauge?

there is also a difference between the brz and the frs

This is where the wire is on my RHD GT 86.

http://i1219.photobucket.com/albums/...psefdfb716.jpg

It is under the glovebox

My non US GT86 does have the certification ECU, so its fitment must rather be linked to features rather than market.

I tapped into the vacuum line from the blow off valve:
http://i1219.photobucket.com/albums/...ps091c3edd.jpg

For JD86, this may help in locating plug A35, and subsequently pin 15. Remember, our RHD wiring is reversed from the diagram showing the plug location:
http://i1219.photobucket.com/albums/...ps80bbff96.jpg
http://i1219.photobucket.com/albums/...ps88840a4a.jpg
http://i1219.photobucket.com/albums/...ps0799ea54.jpg

Thanks guys. I'll have another hunt tomorrow to see if I can find the A35 connector tomorrow. Otherwise one of the toyota techs is looking through the Aus maintenance manual for me. @Pitman I don't think I have that plug that you've gone into. At least not in the same location. Keep in mind I have the lower spec GT which is closer to the FRS then the GTS Toyota which you have. So I'm missing a lot of the extra wiring.

Correct me if i am wrong EcuTek guys... but

Stockfront O2 sensor is accurate down to atleast 12.1:1 without modification
Stock ecu has a map sensor that can be replaced with a multibar sensor
Stock Ecu can control a solenoid valve for boost control

Why can't racerom be used to build in an AFR and Boost pressure based failsafe? You can easily drop to spring pressure using this approach, and optionally limit throttle angle, revlimit, retard timing, dump fuel etc etc.

Almost all if not all ECUTek tuners run some type of failsafe using the one of the above methods.


I dont use the failsafe portion of my failsafe gauge because my tune already has a failsafe feature.

EcuTek can definitely do a boost based Failsafe, but I haven't seen an AFR based one. I am not utilizing the AEM Failsafe features either. I am utilizing the accurate boost/afr in one gauge and the 3 hours of automatic datalogging with a great sampling rate that I can download from the gauge at any time for a great $300 price. I currently have an igntion timing retard boost failsafe in my ROM, and I have a boost failsafe in my EBC as well. I could very easily create an AFR based failsafe with my gauge and EBC, but I haven't spent the time to do it.

I too am running the aem failsafe. With the AVO turbo kit. I am running the Grimspeed EBCS for boost control (factory fit and plug/play). I have it wired similar to the diagram. Basically, on the EBCS it is plug/play to subaru. The wires are simply 12+ and ground. All you do is run that blue wire to one side of the relay (86), 12+ to the other (85). Then cut one of the wires on the EBCS, doesn't matter which one. With the cut wire, run one side to 30, and the other to 87a. This allows it to function just as though there was no relay. Then, when the failsafe has an "alarm" it will trigger the relay, which opens the relay circuit (30 now connects to 87, which is empty), this essentially cuts power to the EBCS and you are now at standard wastegate pressure.

I will draw up a schematic when i get a chance. I have yet to actually setup my AFR alarm, as i am waiting for my tuner to get the EBCS tuned with my new Clutch, so i have it all wired and working properly, but right now running a MBC until i have the EBCS setup.

This will be happening in a couple weeks (hopefully).

As promised, here is a diagram i made showing connections.

http://i1034.photobucket.com/albums/...psccff2589.jpg

So, the boost level of the Grimspeed EBC is run by EcuTek via tune? Is this a popular EBC to use for EcuTek tuning?

I run a COBB but it's all the same.

Where are you guys grabbing the rpm signal from for the gauge?

i use both boost-based and afr-based failsafes in my tunes when possible. in order to use the afr-based one you need to have a wideband wired into the ecu. it's very simple, just a custom map that calculates afr error and another to respond to it however you like (cut spark, fuel, boost or close the throttle usually). it works in concert with my full-time closed loop fueling strategy, which i often end up removing after the fueling has been dialed in (it uses up a lot of custom maps).

Yeah, pretty much any EBCS will work with the diagram i posted. They are all the same essentially.

With the new option of the wideband feed into the ecu via obd2 signal you could really just eliminate this type of connection, since you can do as @jamesm mentioned and have the ecu detect the true afr and switch to a custom map with fuel cuts, boost cut, etc...

I am having mine tuned currently for some options like this, since i already have the failsafe wired up, will probably just keep it in line as it wont hurt anything, adds a bit of redundancy. But have the wideband wired into the ecu now for true logging of that as well.

RPM signal is under the pass side in a harness. here is a thread about it.

http://www.ft86club.com/forums/showt...ailsafe&page=4

Is it possible to have a flex setup using the rear o2 sensor, a wideband feeding into the Ecu via the CPC input and an EBCS running from the CPC output all being controlled via Ecutek?

Where do you grab the CPC inputs/outputs? I understand the CPC output is under the inlet manifold.

Just trying to get my head around this stuff.

Just making sure you saw this:

http://www.ft86club.com/forums/showt...ailsafe&page=4

Let me know if you need any more help finding it.

I did not, completely mr magoo'd that one.

Thanks!

My tuner is telling me that running the UEGO wideband from my AEM failsafe to the ECU is just an over complication of things. That Ecutek already has enough safety features when tuned correctly. Am I just being overly paranoid?

Going to be putting mine in soon as well. No failsafe since I don't have an EBCS now. Basically it should just be a matter of installing the wideband and connecting some power wires then correct?

At a minimum yes it is a matter of running the harness from the sensor itself, a boost source, and a power and ground wire.

I don't think over complication is the correct choice of words. It sounds like you have a lazy tuner who doesn't want to write the custom tables to be able to utilize the more accurate sensor. It doesn't matter how many safety features the ROM has, I would rather have the more accurate AFR data from the wideband sensor especially when you are down in the 11:1 AFR range where the OEM front sensor is not intended to read.

That's what I was thinking, a more accurate reading is going to be better. That being said I know little on tuning. Just bought a book so I can learn some of this stuff to fill the gap in my car knowledge. My tuner isn't using rr7 yet. Hopefully it won't be too expensive down the road to add this feature. Just want to keep the car safe. I'm planning to install a grimm Speed ebc so I can set up boost cut if the wideband detects overly lean conditions.

Sent from my SGH-I747M using Tapatalk

I'm still looking for an rpm reference for the frs if anyone could help.

If you look at some of my posts in other AEM Failsafe threads, I have listed the two wires that you can tap into for the RPM signal. I have pictures of the wire I used as well. Here are a couple:

http://www.ft86club.com/forums/showthread.php?t=37868
http://www.ft86club.com/forums/showt...t=28800&page=4

yes i searched and saw those. My FRS does not have that. There is an empty hole next to my ECU. I believe i can use pin 15 A35 but im having a little trouble determining which one that is.

I know in one of my posts I listed what wire color that one should be according to the BRZ wiring guide PDF someone posted.

Just use a coil reference. IIRC I used coil #2. I can't remember the wire color off the top of my head. I would have to pop open the wiring diagrams or walk to the shop and look but I am too lazy right at the moment haha. I'll be out by the car later if you still need it.

Edit...... I peeled myself from the computer screen. A36 Pin 10 yellow/red stripe, coil #2. You can use whatever one you want though.

I've got a Canadian FR-S, and there is no second ECU box... To make things even more fun, there is no pin 15 in A35. I went around all day trying to find someone competent enough to direct me to a local place I could buy a pin that would fit, and had absolutely no luck. I ended up jamming the wire in there and taping it down until I can find a proper pin.

Does anyone know where we can find pins for our harnesses? The dealership parts counter had no idea. I believe A35-15 is 20 gauge. A de-pinning tool would also be useful because I'm sure to mess it up.

For those having difficulty figuring out what plug is which, just look at the wiring profile compared to the picture of the plug and you will figure it out pretty quick. I tried to use the FSM, but that thing is Godzilla. On the ECU, A35 is the second plug from the firewall, followed by A34. You can see a nice pic of this in the thread about hooking up your wideband to the secondary O2 sensor (if you are on RR7). http://www.ft86club.com/forums/showthread.php?t=57902

Other issue that I'm having is that the supplied USB extender cable seems to drop connectivity while logging. I think it's fitting loose in the laptop's USB port.

Has anyone else experienced this issue? It's a relatively new laptop, low use on it's USB ports, and I've tried all of them. I'm starting to think that the extender cable is just junk and I should go buy another.

I use the extension and a single USB 3.0 port on a tablet with a 4 port hub for ecuTek cable, AEM and license key. No issues.

The wire is very tiny, smaller than 20 gauge I believe. I spliced mine very carefully with a razor blade and steady hands.

I'm going to try a hub. Right now it feels like a physical issue. The USB doesn't quite fit in snugly, and if it gets bumped connection is lost.

Why didn't you use the wire I mentioned literally the post right before yours stating you do not have the tach signal wire as the BRZs do? The Canadian models are not unique in that regard. the FR-Ss do not have the additional module (Certification ECU Assembly) that people conveniently pull the RPM signal from because the majority of FR-S minus the 10 series do not have the push button start and active entrance option. You really should not be stuffing wires into the ECU like that unless you are ok with the possibility of shorting something out. It's the one piece of hardware in the car you should not be half assed about. They aren't exactly laying around in junk yards yet to grab a new one should something fry it.