Options for Exhaust Gas Analyzer?
06-15-2018, 05:57 PM
#1
Rennlist Member
Thread Starter
Options for Exhaust Gas Analyzer?
Hello !
I wonder if you can share any experiences with "home garage" - level exhaust gas analyzers.
I can find the occasional Heathkit analog needle analyzer, and a company called Gunston makes one with equivocal reviews...
Ideally I'd like a unit which I could switch between several cars, instead of a dedicated, mounted-in unit.
I'd like to be able to use it on the 928 as well as Son1's 944, Son2's E30, and Son3's VW Super Beetle.
Thanks in advance for your input.
I wonder if you can share any experiences with "home garage" - level exhaust gas analyzers.
I can find the occasional Heathkit analog needle analyzer, and a company called Gunston makes one with equivocal reviews...
Ideally I'd like a unit which I could switch between several cars, instead of a dedicated, mounted-in unit.
I'd like to be able to use it on the 928 as well as Son1's 944, Son2's E30, and Son3's VW Super Beetle.
Thanks in advance for your input.
06-15-2018, 07:46 PM
#3
Rennlist Member
Thread Starter
06-15-2018, 08:50 PM
#4
Rennlist Member
I have both the Gundsun color tune and a wideband O2 sensor with a guage (AME, I think). The color tune was pretty useless, but the AEM worked out well. However you need to have someone weld a bung into your exhaust pipe.
06-16-2018, 12:54 AM
#6
Former Vendor
Wow. I haven't heard the word "Heathkit" for 30 years....at least.
The amount of stuff out there, for sale, is amazing. I wonder if any of it works?
The amount of stuff out there, for sale, is amazing. I wonder if any of it works?
06-16-2018, 09:03 AM
#7
Do you still have one of these sitting around the shop?
https://www.ebay.com/itm/SNAP-ON-MT3...0AAOxyAc1SM59x
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06-16-2018, 10:49 AM
#8
Three Wheelin'
I have the Healthkit Gas Analyzer, it works, but you have to insert and seal the pipe before the CAT. it works, but a modern AFR gauge with wideband o2 is way better/faster reacting/accurate.
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06-16-2018, 12:02 PM
#9
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
The "comprehensive" analyzer reads CO, HC and NOx. The wideband looks only at CO. Decide what you really need to measure and then look for a tool that does it for you.
CO is a direct product of fuel combustion, such that fuel mixture (fuel:air ratio) can be adjusted. Readings give you the average for all connected cylinders, so you often find some cylinders leaner and some richer when tuning at a single common header point.
HC is the unburned portion of the charge that passes through. Got an ignition misfire? Higher HC is the result. A cylinder that doesn't fire doesn't change CO since there's no combustion.
NOx is the result of hot-spots in the chamber, often from a lean condition from a partially-plugged injector, for instance.
If you want to get an idea how well everything is working, you really want to look at all three components. Plus individual exhaust gas temperature sensors.
CO is a direct product of fuel combustion, such that fuel mixture (fuel:air ratio) can be adjusted. Readings give you the average for all connected cylinders, so you often find some cylinders leaner and some richer when tuning at a single common header point.
HC is the unburned portion of the charge that passes through. Got an ignition misfire? Higher HC is the result. A cylinder that doesn't fire doesn't change CO since there's no combustion.
NOx is the result of hot-spots in the chamber, often from a lean condition from a partially-plugged injector, for instance.
If you want to get an idea how well everything is working, you really want to look at all three components. Plus individual exhaust gas temperature sensors.