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Old 11-18-2011, 08:02 AM   #9 (permalink)
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meelis11's Avatar
Join Date: Feb 2009
Location: Estonia
Posts: 199

Green frog - '97 Audi A4 Avant 1.9TDI 81kW
90 day: 43.1 mpg (US)
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Anyone has good examples to show how to set up exhaust heat exchanger?
Basically you need to wrap copper pipe around exhaust and coolant flows through that spiral? How many wraps around exhaust?
How much is it possible to make warmup time quicker?

That autospeed idea seems really good to use it as heat battery - to preserve waste heat that in the morning you get engine warm sooner.
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