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I have a blow through (carbed) 2387 with a modified CB hideaway header... I'd like to fit a wideband to help tune, but am wondering where the best location is?

I understand there are concerns about heat from turbos and also 'air' from the tip. Is one a lesser evil than the other?

Probably near the end of the bend if that clears bodywork.

miniman82 wrote:The 24" rule applies to modern vehicles which typically have the turbo mounted as close to the valves as possible to conserve heat, the worry there is sensor overheating. VW engines already have a much longer exhaust system due to the flat engine configuration, so the 24" rule goes out the window. I try to place mine about 4-5" back from the turbine outlet flange, never had a problem. You lose so much heat through the primary tubes on this engine, you'll never overheat the sensor.

You can put it on an extension, or even get heat sinked setups, but as noted above it' probably a non issue on a typical ACVW long tube exhaust with a turbo further cooling EGT down. Running too cool throws the accuracy out the window. Some OEM setups have it screw into the turbine housing, so i would not sweat it at all.

BUT:A big issue is it has to point DOWN +/- 45 degrees from vertical, as water is the primary byproduct of combustion, and O2 sensors HATE liquid water. (it can kill them if they are at temp)
Try to put it on the inside of the curve or such where its unlikely to get sprayed down with condensation as badly.