AEM Wideband Failsafe Gauge

[Pitman]

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

[Sportsguy83]

Originally Posted by Pitman

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)

[Pitman]

Originally Posted by Sportsguy83

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?

[Sportsguy83]

Originally Posted by Pitman

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

[arghx7]

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.



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.

[King Tut]

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.

[JD86]

Originally Posted by King Tut

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.


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


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.


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.

[King Tut]

Originally Posted by JD86

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.

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?

[DAMotorsports]

there is also a difference between the brz and the frs

[Pitman]

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



It is under the glovebox

[Pitman]

Originally Posted by King Tut

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.

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

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:


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:

[JD86]

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.

[mad_sb]

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.

[Sportsguy83]

Originally Posted by mad_sb

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.