Gunson CO2 meters, Air intake sensor

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <199803032131.QAA09062@coimbra.ans.net> "Renier Meyer" writes:

> IMHO The Gunson meter should give you a fair indication of what is 
> happening with the CO2, I know people who swear by it. I have seen 
> another one that settles much faster and responds much quicker, the 
> owner told me that it operates using  infra red, sounds like that   
> should be more accurate, also costs a bit more.

Like $1000 more.  If anyone can find me a portable single-gas analyser using 
the infrared principle for less than $1000 - I will buy much beer.

> I have opened a Gunson, and it appears that it uses a heated wire 
> bridge that compares the intake gas with a closed off reference. It 
> has to warm up for abt. 15 mins before measuring.

They say two minutes.  Allow as long as it would take to drive to your Audi 
dealer, plus as long as it would take to drive back.

> That brings up a question, what would be a good way of measuring 
> mixture setting whilst driving? (Our cars were not equipped with a lambda 
> sensor and mixture setting makes a huge difference in the car's performance.) 
> Charles Probst talks about measuring gas temperature in the 
> exhaust?

Watch this space.  This is _very_ much an open issue.

-- 
 Phil Payne
 UK Audi [ur-]quattro Owners Club