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Message
Yair Rusty,
No closed loop on the Microtech! These are
1000 buck computers not 4000 buck computers. The Motec M800 and Autronic
SM-2 units do closed loop. The Autronic actually has a closed loop self
tuning function that works on the cheaper $2000 SMC unit as well.
If you use a good quality Lambda sensor, they
can cop a bit of lead for a while. Alternatively, you just take with
you a pocket full cheap single wire sensors. I normally use a Bosch 4 wire unit to do the tuning, and then
remove it altogether and just plug off the hole.
With the insto I'm planning, I'll have 2 of
the cheaper Autronic SMC units. They are about 1800 AUD each. This
gives me total ignition and fuel redundancy, and there is sufficent room
in the memory to put the "Auto Tune" software on one, and still have all
the other optional functions on the other.
This will mean that I can use a Bosch 4 wire Lambda
sensor for fine tuning. I have no experience with 100LL so I will just
have to see how it effects the Lambda Sensor. I know that with the race
cars here in Oz, they do have lead resistant Lambda sensors, but in
the scheme of things with a touring car worth maybe a quarter of a million or
more, maybe a $400 sensor is just beer money each meeting.
Anyway, I'll have to get hold of a drum of
100LL soon as I will have the REW engine ready for testing by the end of
January. Same goes for the RX8 Wunlunga. Just have to finish the
porting and I'll slap her together and chuck it in the Mule over Xmas/New
Year.
Cheers,
Leon
----- Original Message -----
Sent: Wednesday, December 22, 2004 1:17
PM
Subject: [FlyRotary] MicroTech?
Greetings,
I was thinking about
Paul's MicroTech, and wondered if it runs in closed loop mode, such that it
uses the O2 sensor for mixture control. If it does, then what will
happen when leaded fuel is used, and the O2 sensor becomes slow to
respond? I'm guessing that Dave Atkins flew his with the same computer,
and he did enough cross country to be forced to use 100LL. Probably it's
not an issue, but I just thought I'd throw it out as something to think
about.
Cheers,
Rusty (lots to do, but
nothing to do it with)
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