like slo crx said its all in the tuning you can run high compression and high boost just fine without detonation as long as its tuned properly

 

Different engines respond different ways to boost. I know nothing of how efficient the A6 is.
10:1 on a 22RE engine - 4cyl 8 valve would be about the limit on pump gas with NO boost.

You can tune anything. Or run higher octane. Pulling timing helps, but it can result in high EGTs that are not sustainable for your pistons and/or vavles.

Consult the A6 experts to see how they're doing boost. It sucks being in the "learning curve" on a motor that hasn't been boosted before. The learning curve is expensive!

 

Only dyno time I ever had on it was an sc61 setup on it @ 13psi, then dropped it down to 10psi for the street. Made 317 on a dynojet, and I figured it would be pushing the limits for a stock motor, so we detuned it a bit. Not to mention my 450's were maxed.The hg trick can work, but I wouldn't really advise it. It ends up moving the combustion process down into the cylinder more instead of in the chamber where it should be. Honda heads don't really have much room between the combustion chambers and the coolant jackets, so the most you can really do safely is clean up the castings to avoid hot spots that cause detonation. Lower c/r pistons is def. the best way to go lower.