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Join Date: Sep 2013
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air-fuel ratio

What is the best way to measure afr?
1988 930
Old 07-17-2017, 06:12 AM
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This: PLX Devices DM-6 SM-AFR Gen4 Gauge Combo UEGO AFR Air/fuel Ratio Bosch LSU 4.9 Wideband Oxygen Sensor Controller with 2 1/16" (52mm) OLED touch screen multi gauge. https://www.amazon.com/dp/B00U1J1MCK/ref=cm_sw_r_cp_apa_wYlBzbZQF5KCR

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- 1979 930
Old 07-17-2017, 06:33 AM
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I have what Kenik suggested. I like it. There are other good ones too, of course.

Are you in zip code 07845? If so, I am like 10 mins from you in Mt. Arlington. Would be happy to get together to show you what I have and how it works on my 88.
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1988 930 Venetian Blue
Old 07-17-2017, 07:56 AM
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Something to keep in mind is most of these are installed in front engine cars and the cable is around 8 feet long so you need to buy one that has a much longer plug in cable available so you can install it in a rear engine car.

The wideband oxygen sensor for it should be installed after the turbo according to instructions that come with it. Exhaust back pressure in the headers can distort wideband AFR readings if it's mounted before the turbo and if the O2 sensor ever had any pieces burn or break off you don't want them going through the spinning turbo.

When I had a 930 I installed one of these Innovate AFR gauges with the longer Innovate cable they make for it. They come with white and black bezels and face plates so you can use whatever looks best in your car.
Never had any problems with it and it always worked well.

Looks like the price has gone up a bit since I bought one and ebay sellers may have the lowest price.

Innovate MTX-L Digital Wideband Air Fuel UEGO O2 Controller Gauge 3844 | eBay
Old 07-17-2017, 09:04 AM
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Yes Jim, the cable length is certainly something to be sure about when purchasing. I mounted the PLX controller boxes under the driver's seat and all the stock cable lengths (to the display unit and to the Bosch sensor) were long enough for me. I assume that isn't always the case, and would depend on where the controllers are mounted too.
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Old 07-17-2017, 09:17 AM
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That's good to know. The innovate controller is built into the gauge so nothing else to find a place for other than the long cable.
I think I looped the innovate's extension cable length around in a circle under the passenger seat.
Old 07-17-2017, 10:09 AM
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Have the PLX here too and love it... Doesn't require 2 oxygen sensors either... It has a output signal for your cars lambda system...
Old 07-18-2017, 04:32 PM
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Quote:
Originally Posted by bpu699 View Post
Have the PLX here too and love it... Doesn't require 2 oxygen sensors either... It has a output signal for your cars lambda system...
This is what really turned more into the PLX. I can read the AFR and feed the ECU with one sensor. I also have mine under the driver's seat, as does another car I know.

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Old 07-18-2017, 04:51 PM
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Quote:
Originally Posted by kenikh View Post
This is what really turned more into the PLX. I can read the AFR and feed the ECU with one sensor. I also have mine under the driver's seat, as does another car I know.
Mine is under the seat too.







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Old 07-18-2017, 05:06 PM
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Boost gauge to replace clock - options?
Related thread you should look at.
Johan
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Old 07-18-2017, 05:23 PM
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Boost gauge to replace clock - options?
Related thread you should look at.
Johan
Good thread. If only I didn't have a VDO telltale...

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- 1980 911SC Targa
- 1979 930
Old 07-18-2017, 05:29 PM
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Innovate MTX-L
PLX
14Point7
AEM

There's a plethora to choose from
Old 07-18-2017, 06:12 PM
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I went with Innovate a few years ago, started with the LM2 which allowed me to add map (boost) and fuel pressure to the standard air/fuel and rpm.


I added a separate board under the glove box. This helped me fine tune the old cis until usable.
[

I then parked the handheld on the console and added their A/F gauge in the console along with fuel pressure and volts.



I haven't used the hand heald since but it is there if I need to record a session. Innovate does not seem as easy as some other brands but maybe it's just way over my head in some areas. I need to go back and relearn some of this as I get the time.
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Old 07-19-2017, 04:43 AM
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