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Gunson vs. Heathkit (The CO shootout)
I purchased a Heathkit a few months back and used it to set my CO mixture, but I had wondered how accurate it was... So a friend has a Gunson and I decided to set them both up and compare the results.
  After letting them both calibrate for 10 minutes, I plugged them both into the exhaust pipe to get some readings. After some adjustments, I settled at these readings: The Heathkit read 2%  The Gunson read 2.3%  It was idling nicely right around 975 RPM.   So, I figured not too bad, they were within .3%. BUT, after I shut the engine off and let the units re-calibrate back to the starting point, the Gunson returned .3% lower than the calibration point, so they were in fact bang on! Pretty cool. I must say that I prefer the nice big analog meter on the Heathkit, but both work just fine for a basic C0 reading IMHO. I took the car for a nice long drive and it was running really nicely. |
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03-09-2014, 11:33 PM
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Very nice review. Would be nice to also have a WideBandO2 comparison, like the LM1 just to see how close the WideBand is in AFR vs CO.
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Sal 1984 911 Carrera Cab M491 (Factory Wide Body) 1975 911S Targa (SOLD) 1964 356SC (SOLD) 1987 Ford Mustang LX 5.0 Convertible |
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03-10-2014, 05:11 AM
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I'm into testing and comparing an LM1 if anyone has one in the Vancouver (Surrey/Langley) area.
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03-10-2014, 08:04 AM
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1988 Carrera
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Where did you buy the kit?
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03-10-2014, 08:50 AM
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I too would like to see the correlation between CO and AFR.
It is interesting to see CO meters used. Really old school......and interesting to see Heathkit being used. I really wonder how these museum piece units measure up to modern AFR instruments. I have and AFR permanently installed in my 1973 2.7 MFI car and it has been wonderful in making the MFI REALLY work!! I also find it is good to have it working all the time and be able to download the data and study it. The correlation is pretty straight if your are using CMA manual. 
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RGruppe #79 '73 Carrera RS spec 2.7 MFI 00 Saab 95 Aero wagon stick 01 Saab 95 Aero wagon auto 03 Boxster 90 Chevy PU Prerunner....1990 Last edited by dicklague; 03-10-2014 at 08:59 AM.. |
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03-10-2014, 08:52 AM
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I found it on CL along with the engine analyzer.
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03-10-2014, 08:53 AM
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Old school car, old school gear!!!
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03-10-2014, 08:56 AM
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Quote:
I am just jealous you found them!! Have fun!!
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RGruppe #79 '73 Carrera RS spec 2.7 MFI 00 Saab 95 Aero wagon stick 01 Saab 95 Aero wagon auto 03 Boxster 90 Chevy PU Prerunner....1990 |
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03-10-2014, 09:02 AM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Good for setting idle mixture. Not so good for road testing (response time).
How's the Heathkit in that regard? Sherwood |
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03-10-2014, 11:15 AM
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Registered User
Join Date: Mar 2011
Location: Upstate, South Carolina
Posts: 267
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Interesting.... I didn't know Heathkit made these. My dad has a ton of Heathkit amateur radio equipment... most all of it Heathkit green.
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03-10-2014, 12:58 PM
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Zoe
1984 Cab Factory wide-body (M491 option)
Porsche 911
RS Homage
