Hi guys, I just went through the installation of several GReddy gauges (boost, EGT, oil temp, coolant temp). I am still planning on getting the ECU+, but am wondering what the rest of you have done with your setups. I am assuming that I'd have to tap another runner for EGT, as well as add another boost sensor... but ideally, I'd like to be able to hack into the current setup and tap the signals.

I realize that the ECU+ may not have the right calibrations curves programmed to accomplish this, but I just wanted to see what everyone is doing.

 

I was just thinking of the same thing. i want to tap the EFT sensor from my Defi guage to also read with my Zietronix unit. I know that you definitely need to use the right kind of wiring, but I still not sure if it would degrade the signal sent to both units. Good post.

 

So you want to read the EGT from your Defi with the Zietronix? Honestly, I don't think this is going to work... isn't the Zietronix unit "hardcoded" to work only with their sensor? It's possible to convert the Defi signal into one that the Zietronix wants (i.e. voltage range), but the problem is that all sensors have different curves, so the reading you get on the Zietronix box most likely won't be accurate.

I think the only way to do this (if you're really, really desperate) is to take a Zietronix box, and then figure out its calibration curve empirically. Then take your Defi EGT sensor and put it through the same experiment, logging temperature vs. voltage. Then you would need to write code for a chip that has an ADC and a DAC. Feed the Defi output to the ADC, then the code would convert from the Defi table to the Zietronix table. Finally, the output from the ADC would get fed to the Zietronix box.

Sorry for the long-winded response. I think this is the only way to do it, but I'm sure that more experienced EEs here have a better way.

 

Well I can't speak for the Greddy boost sensor. But I have an Autometer electric gauge that uses a GM map sensor. I had both the gauge and the ECU+ reading off the same sensor with no problem. I even confirmed it with a second sensor, how I currently have it.

EGT is still up in the air, since Tom doesn't make or have anything to do with the adapter, he can't say one way for sure.

External oil and coolant sensors aren't setup to be logged.

Funny thing is I'm thinking of building a car-pc and getting rid of my current gauges. I actually prefer looking at the ECU+ to see the status of the car.

Hope that helps some

Ivan

 

I think the reason it works for you is that in this specific scenario, both Autometer and the ECU+ can be configured to be compatible with your GM sensor. I think the ECU+ supports a few different mass air sensors.

The car-pc idea will work. I assume that you are going to do this to run the ECU+ software on it. From what I understand, it doesn't have a virtual gauge display, though. My personal long-term project right now is to get my color touchscreen LCD up and running so that I can display virtual gauges with the ECU+, and without a PC running windows. Eventually, I will either add the LCD to the car, or remove the radio, relocate the climate controls, and order the double DIN panel from Gruppe-S for the LCD.

 

I would think if you could find the pressure to volts scale for the Greddy sensor, Tom could maybe implement it. Though that's up to him.

I guess I've gotten so use to looking at the ECU+ windows, I like them better then a gauge display. I like to see what has taken place in the last 30 seconds, which a gauge display won't show me.

It would be a double din, touch screen lcd, windows based pc. Details beyond that I haven't thought of much. Though, now that Tom has map switching for the Palm, I might go that direction.

 

Ahhh, map switching! That was another reason for my project, but it's good to know that the Palm can do this now. Awesome!!! I assume that if you hook up the ECU+ and don't do *anything* (i.e. factory setup), it runs as if nothing is there, right? I'd like to drive daily with my WORKS P2, and then when learning about tuning, etc., then play with the ECU+. Sorry for going OT here.

 

Ivan,

I am working the car PC thing as well. I originall wanted one for just MP3 playing, until I ordered my ECU+. I have a 7" touch screen going in and a few other tricks up my sleeve. We are thinking alike.

 

No apologies necessary. I appreciate the input as I am asking questions first and acting later.

however, I still think its possible as the Zietronix unit uses a standard K thermocoupler sensor. I could disconnect the Defi guage from the EGT sensor and connect it to the Zietronix and it should still work. this is from RRE and Zietronix:

The EGT Sensor
Zt-2 reads the exhaust gas temperature through a standard K thermocouple, the same as used by most aftermarket EGT gauges. You can retrofit your EGT probe with supplied Zt-2 style 2 pin connector or purchase a new probe from us. Moreover, we offer 8' chromel-alumel extension wire with the Zt-2 style connector in case you need to extend your EGT probe.

Now the question is whether or not I can read both the Defi guage and Zietronix from just one sensor?

 

Good info! I'm no expert with thermocouples, though I have used them a bunch at work with other third party devices. I believe that you can't do something like run the leads from the thermocouple to two different devices, as they are very sensitive to the contact material. Thermocouples rely on a voltage difference between two different types of metals, so if you run the sensor directly to two different circuits, you'll likely have issues. My guess is that it won't work...

 

Now that is very good info! Thanks. I'll give it a try though and if doesn't work, I'll put it back the way it was.

 

BTW, I posted on this topic even though I don't have the ECU+. But I am very intrigued in getting one over my current SAFCII.

 

Yes, please do! It would be interesting to see how it will work with my GReddy setup.

 

I don't either, but will probably purchase one soon. This weekend I'm going to tackle making the wiring harness first, though.