would timing map be the same if u switched out to a bigger turbo?

is timing pulled according to horsepower or is is pulled according to boost pressure?

 

i would make it a little more conservative even at lower boost because you will be making more power per psi.

 

^^^^BUMP^^^^

come one guys......wanna look but not answer? IMO this is a really good question.

 

^^^BUMP^^^

come on guys! is this not a good question? or is it that u guys dont know?

 

bump!!!!!

 

Timing is determined by charge density and the optimum length of burn before you blow it all out the exhaust valve.

When you say "switch to a bigger turbo" there are two aspects to address - one of which, the turbine, you may be ASSuming stays the same and just thinking of compressor.

A bigger compressor - not always but usually with most T3/4 and GT stuff - is more efficient at any boost level. You get denser fuel:air charge, at a cooler temp and have to fire the mixture sooner until thermal mass of burning charge overcomes cooler temps and you start pulling timing again.

A bigger turbine effectively lowers exhaust manifold pressure, allows the spent (spending? ) charge to evacuate the chamber sooner, which can (not will always!) like more ignition timing to start things off a touch sooner. Less hot side pressures also translate to less reversion, and less chamber temps because less hot exhaust is hanging around the head/exhaust port/exhaust valve to keep things hot. Refer back to combustion temps, thermal mass, comments in re denser, cooler charge in the above paragraph.

There's a lot of give + take, not really any one general trend for ignition. You'd be surprised how particular it can be if you want to be wholly **** about it - most timing maps I see are generic, operating off the retard + advance whole columns until she doesn't knock theory aka expediency.