awilson40

I am really leaning on the Zeitronix wideband due to its low cost and datalogging capability but I really dont like its display.
The unit has a 0-5 v output just like the PLX unit.
What about using the PLX converter with the Zeitronix to drive a
Autometer gauge???

http://www.plxdevices.com/NB_WB_GaugeConv.htm

special tool

I cannot say enough good about it. It is so easy, its funny.

I will say this... I believe he has set the software to read on the lean side, after a couple of hands on experiences - which is probably a wise business decision on his part. I think it shows .5 - .75 lean.
I am using the tps channel to log my maf, which is more important to us. The user input is nice, but you have to convert from 0-5 volt to percentage, if you want it that way.

hosrom_951

When purchasing the Zeitronix wideband 'kit' we don't need the o2 sensor right? we simply 'plug' it in to the o2 plug at the DME correct?

awilson40

no...
You must weld in an exhaust bung, install the proper wide band sensor and wire in the controller just like all wide band O2 kits

special tool

Hosrom - no. The wideband is a 5 wire 0-5 sensor. MUCH more accurate than the 0-1 volt narrow band. The narrow band is only really a switch, you can easily see this if you watch its signal. There is absolutely no comparison for someone looking to correctly tune afr.

It is, however a good idea to keep the narrow because it is faster - you can also see this as compared to the mock narrow output signal from the 5 wire. The Motronic will like the original narrow better.

hosrom_951

So, what's the opinion of keeping a narrowband and having a wideband converter (as shown on the link above)?

awilson40

I guess you dont understand what I want to do...The basic Zeitronix doesnt have any sort of a display. I dont care for the display they offer. I want to use the autometer gauge as a display
for the wideband output using the adapter from PLX. Its had nothing to do with the stock narrow band system. Anyway...I think it will work fine.
I could also pick up a small 0-5 v digital display and use that also.

macnewma

Just email PLX and ask if it will work with other widebands. I think it should as all it is doing is translating the 0-5v to 0-1v (not as simple as stepping down the voltage though, WB and NB sensors' output differ greatly).

Max

nize

i've been looking at the AEM Gauge-Type Wideband UEGO Controller;
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/161948-aem-wideband-uego-controller.html

macnewma

The AEM is nice, but the Zeitronix allows for logging of the Boost, EGTs and WB02 signals.

Ultimately, there are 2 uses for a WB02, tuning and monitoring.

For monitoring, you simply want to make sure you aren't hitting any dangerous A/F ratios. This requires a display that is visible to the driver. For tuning, you will probably want something that can datalog so you can look back at different runs in different situations.

IMO, logging is more valuable than a viewable display. The AEM logs, but it only logs WB02. The Zeitronix logs Boost, EGT and WB02.

Also, nize, why do you want WB02 on a stock car? I am not sure it will do you much good. You don't have the ability to modify the A/F even if it is bad.

Max

Max

nize

because i'm finally thinking of getting off stock...

macnewma

I see. In that case, I assume you will eventually obtain some method of altering the A/F. Zeitronix, IMO, wins hands down. For $279 you can log all 3 data points (actually one more 0-5v that is the user's choice). This doesn't include a display, but you can either adapt a Autometer gauge to work or buy the Zeitronix display.

I am still undecided as to what I will do because I am not certain which standalone path I will take and when. Some standalone computers take a WB02 input so I might not get a WB02 setup aside from what the standalone provides.

Good luck and do some searching on the forum, there is alot out there.

Max

TT

You can use a 1/3 gain inverting amplifier and run the 1V Autometer gauge off the Zeitronix. IIRC their AFR to Voltage transfer function is slightly nonlinear and peaks around 3V, but it should work well with the Autometer gauge. You just have to readjust your eyeballs and brain to interpret the display. From left to right the leds would represent roughly:

20.2, 19.4, 17.6, 16.2, 14.7, 14.3, 13.8, 13.2, 12.7, 12.2, 12.0, 11.7, 11.3, 10.9, 10.7, 10.4, 10.1, 9.8, 9.5, 9.3

Use a [edit - brainfart trying to get out of work early] rail-to-rail op amp and some precision resistors. You will need to pin the upper rail at 3V so a 3V supply is needed. Everything you need is at Radio Shack and circuit designs for the amp are on the net. If you're really into hacking, crack open the autometer gauge and replace the LEDs with the correct color for the AFR. You could even fit the amp circuit inside the gauge casing, just glue the op-amp upside down to their board and wire it up: power, ground, and input signal are all there.

If you decide to replace the LEDs in the gauge and don't mind the direction being reversed (rich to lean, left to right) you can just use a precision resistor voltage divider (3:1), much simpler to modify, less parts.

Jake951

Here's the voltage to A/F conversion chart for the analog output of the ZT-2 (from the Zeitronix Web site):



It peaks at around 3.25 volts and has a slightly compressed shape. TT has the right idea. It should be quite easy to adapt the ZT-2 output to an Autometer LED gauge.

macnewma

Hey, whoever wants to do this should put together a writeup. It might be a somewhat popular thing to do.

It would be cool to run the Zeitronix without their display and just a cheap autometer gauge. I like the datalogging capabilities of the Zeitronix, but the display is a little big.

Max