Zeitronix 2 Wideband AFR Meter

Timmerklits · Post by **Timmerklits** » Sat May 06, 2006 10:25 am

Hello,

I can't get a good signal out of the sensor, I have connected the wideband output to megasquirt.

It is mostly below 9.6 afr, and when I give gas or riding it swings all the way around, but its never steady.

In the program supplied with zeitronix I see just the same.

What can this be? At first I thaught the sensor wasn't getting hot enough, so I moved it closer. But stil no improvemend.

Nick

Timmerklits · Post by **Timmerklits** » Sun May 07, 2006 3:41 am

Hello,

Here is a log file.

Maybe someone knows more with it.

Next i'm going to try a stock narroband sensor, if it then is good, my zeitronix sensor will be broken.

Nick

keithmac · Post by **keithmac** » Sun May 07, 2006 3:35 pm

The sensor is heated (you get a 30sec warmup message on the display), check the wiring first and make sure you aren`t really running rich (pull a plug and have a look at it).

Unscrew the sensor from the exhaust and leave it in free air, the afr should be 21:1. Have you got the dash mounted display?

Timmerklits · Post by **Timmerklits** » Mon May 08, 2006 8:11 am

The heating works, if you switch the 12v on than after a few seconds you see that AFR is rising and rising.

But there is something stange, it goes to 25.5 than it start again at 0 and then back, three times, and then it stays on 25.5 (in megatune)

In zeitronix the program, it rises to the max, 21 I think.

I wasn't running rich, The CO was 1.0 and ppm HC 150 or so on idle.

I will try it in free air.

No, i don't have the dash display

Nick

Timmerklits · Post by **Timmerklits** » Mon May 08, 2006 1:40 pm

I have tested with a narroband sensor, (the LSH6 from bosch).

The signal was approx. 0.9-0.95v

I set the switching point to 0.85v and used auto tune, and it worked.

But were is the lambda 1 point?? How do you know were to set the switching point? Because this is the only accurate point with a narroband sensor.

Can it be that my other sensor the Wideband lsu is damaged?
this was the first time I used it, it is brandnew, i don't understand it.

Nick

keithmac · Post by **keithmac** » Tue May 09, 2006 1:56 pm

A switch point of 2.5v will give you 14.7:1 using the ZT-2 wideband.

Narrowband is normally 0.5v.

Try 2.5v in the ego correction screen using the zt-2 and se what happens? Have you set the settings.ini up correctly in megatune to tell it you`re using the Zt-2?

Timmerklits · Post by **Timmerklits** » Wed May 10, 2006 7:49 am

Okay, I will try that.

The settings in the ini files are okay.

But in the program delivered with zeitronic I see just the same values so the problem isn't there.

Just one question I have.

Normally I have variabel inlet camshaft timing, (28Â° (before TDC) wihout it, and 60 Â° if the coil of it is powered).

Its not connected now, but maybe because of that I have weird readings of EGO and also when I try it on the bench, at full trottle the map begins to swing from 106 to 94 kpa???

I think the best thing is to let megasquirt activate the camshaft at 2000 rpm or map above 90.

Thanks Nick

Timmerklits · Post by **Timmerklits** » Sat May 13, 2006 7:52 am

I found the problem.

My car uses to much oil, if you put the trottle down then its all blue smoke, oil gasses.

I have tested the zeitronix in an other car wich has 3 lambdas, I replaced the last one and after the warming up period, it gives a steady 14.7,.

I have put some additives in my engine, just for testing, but i think its not going to work. Next test will be tomorrow.

But I have tuned it on the seat off my pants

, it has now 102 Rear wheel hp, with the original efi it was almost the same.