Has anyone used the warning feature of the ZT-2 to do map switching? If so, how did you wire it up? I'm not sure whether the warning output of the ZT-2 (white/blue wire) is a 5v signal, or whether I need to use the ZAVT relay to trip a 5v signal to the ADC port. I'm planning to use this in conjunction with an Aquamist DDS3 as a water injection failsafe.

Thanks!

 

Works great. It is a +5v signal too . Try it out with simple settings to confirm it works. If u are using a map switch already, be sure to install a diode inline between the map switch and the ecu and another between the zt2 and the ecu. I can draw a diagram when I get out of work.

 

I'm not using a map switch. Would I need a diode between the ZT-2 output and the ADC pin? Thanks!

 

No, you should be fine without the diode.

 

Care to explain the process as it'd be nice to do with my Zeitronix as well!

 

Well, I just put a multimeter on the warning output of the ZT-2 (pin 5/blue and white wire) and it goes to 5v on a warning event.

Previously, I was running an EBC, Aquamist DDS3, and ZAVT-1 set-up where upon either (1) a fault condition detected by the DDS or (2) a fault detected by the complex warnings of the ZT-2, power to my EBC solenoid was cut via either a break in the SW1/SW2 connection of my DDS3 junction box or a break triggered by the ZAVT-1 relay connected the ZT-2.

Since I just converted to tephra v7 and a 3-port with map switching, my plan is to set it up so that if there is a fault detected by either the DDS3 or the ZT-2, then it will switch to my pump gas low boost alt map.

The default state of the ZT-2 warning output is 0v. I'm planning to jump from +12v on the DDS3 junction box to a 5v voltage regulator (7805 IC) to SW1 on the Aquamist junction box. Then run SW2 to user input1 of the ZT-2, so that upon a DDS3 fault the ZT-2 will see < 5 v.

Then I'll configure the ZT-2 so that it will send a +5v signal (via pin 5) to the ADC input on the ECU if any of the "simple" or "complex" warnings are triggered. My "simple" warnings will include seeing less than 5v on the user input (i.e., an Aquamist fault), or EGT > 900c or so. My "complex" warnings will include conditions when AFR > ___ and Boost > _____ and EGT > ____. I may modify slightly depending on how much meth vs. water I end up running.

My alt map will be a very low boost pump map and my regular map will be my water injection map, so sort of backward from the way people have done it with just an HFS and the stock ECU together.

I like the fact that the Zeitronix will enable the warning condition to continue for many seconds, so that I'll know for sure that things aren't right. Also, the Zeitronix will make me feel a little more secure about the 2 second delay before the failsafe kicks in on the DDS3 should the fault occur upon the initial onset of boost (i.e., 2 second period after IDC initially exceeds my trigger %).

I know I'm speaking in language that only Aquamist and Zeitronix people understand, but hopefully it's helpful for others. If my thinking is wrong-headed on anything, please let me know!

Thanks!

 

The 2 second delay only occurs when enabling the DDS3, if a fault occurs, it reverts to 0v instantly. When I have some time later I will go over a few other variances you can try. Also, its always wisest to have the standard maps be the safer pump gas maps. That way, if power is ever lost at the ADC input, you are safe.

 

Thanks for your thoughts. My understanding of the 2-second delay on my DDS is that it will wait to trigger a fault for the duration of time between when the IDC trigger % is initially satisfied and the beginning of when it senses a problem, but not to exceed 2 seconds. So, if you are more than 2 seconds into a pull it will trigger immediately. But if you are off the throttle so that the IDC drops below the threshold, then you get back on it and there is still a fault condition, it will wait for however long you were below the IDC trigger, up to 2 seconds before tripping the failsafe. Since this is a road race car and I frequently lift at high RPM and get back into it at high RPM (where the boost will spool very fast), this 2 second thing could potentially come into play more than on a drag sort of car.

On your second point, do you think it's more likely for the ADC input to lose power during a fault event than it is for another method to continue to send power to the ADC input when it isn't safe to do so? I'm not sure I understand the factors that might affect the probabilities.

Thanks a bunch!

 

hi,
did you complete the installation?

 

Wow four years and "two days"!