Before I raise anyone's blood pressure, let me explain that 2.1l WBX
DJ-code (112hp) calls for timing to be set at 10 degrees BTDC.

When I bought the engine it came with timing set at 0 degrees, or TDC.
 The idle is OK, the power is good.  I set timing to factory spec 10
BTDC, and idle is lumpy, but I don't see any more power.  Throttle
response seems the same and my timed 30-50 and 50-70 are identical
under nearly identical conditions (ok, it is a little cooler tonight).

Theoretically, which is better, 0 or 10 BTDC?

--
Chris S.
Disclaimer: "Death and serious injury may occur"

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