[200q20v] boost controllers
brett at iclick.com
Wed Jul 26 22:35:51 EDT 2000
At 8:09 AM -0600 7/24/00, Brian.Link at Level3.com wrote:
>Has anyone installed an after market boost controller?
No. And don't :-)
Audi and Bosch spent years on the Motronic engine management computer
and it's based off almost(or more than) half a century of experience
The boost controllers are based off brute force technology. They are
'dumb' compared to the advanced tables, sensors, and adaptive nature
of the Motronic(not to mention, the advantage of having mixture,
timing and boost control all done by one unit.)
Don't go replacing(or overriding) the ECU with a $300 piece of junk
when 20v turbo engines run $3500+(that's if you can find one.) If
you look at the boost controllers and the guys who use them, they
compensate for lack of boost control complexity by changing the
timing(in a fixed way), and by using massive intercoolers. Our cars
use smaller IC's and much more intelligence; the Motronic box
monitors, and bases its various "decisions" based on coolant temp,
intake temp, boost, O2 exhaust percentages, throttle position,
knock(2 sensors), engine speed/crank position.
The only units which match that kind of functionality and complexity
are race engine management computers that allow for full programming
and logging. They are -very- expensive, as can be the programming
mistakes :-) I bet they're serious fun to play with though, if
you're careful and know at least a little about what you're doing :-)
I think some of them will even "learn" the stock ECU, by monitoring
the same outputs.
As for the stumbling, it might be a toasted O2 sensor. They last
around 60k miles, never more than 100k. There are a lot of other
possibilities though, like intake leaks. There are probably at least
a dozen things that affect high boost performance.
Get a pro mechanic to look the car over, and/or read the Bently and
Scott M's site and check each sensor/item you can; some of them take
all of a minute or two to verify.
Brett Dikeman Systems Engineer
iClick, Inc 914-872-8043
120 Bloomingdale Rd. 914-872-8100(fax)
White Plains, NY 10605 http://www.iclick.com
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