My Basics: Boosting a D16z6 stock, up to 8psi, on a Garret t3\t4 .50 on a P28, chipped with Chrome, LC1 wideband, EGT guage, det-can

I look at other z6 basemaps, and people are pulling extra timing while still in the Vacuum columns.
I don't understand the theory behind this. Why are they changing the timing there?

Shouldn't the timing be identical to a N/A engine while in vacuum, and only pull timing in the boost fields?

I tried running one of these basemap, just in vacuum, and it lacked some low end power, the cruising felt weak, etc.
I tuned it myself using the Xenocron guide, and left the timing alone in the vacuum fields, and just pulled timing in the boost fields, and it felt great in the low end, and cruised so much better.

Am I doing it wrong?

 

you're doing it right from what I can gather. actually, often times you can add some timing to the vacuum tables due to using higher octane with a turbo setup on a stock motor. the stock timing maps are meant for 87 octane gas in a stock motor, higher octane requires more timing. be careful though, too much timing even in vacuum can have the same effect as too much timing in boost.

when people pull timing from the vacuum columns, either:
1) they dont know what they're doing and are trying to be safe
2) its a built motor with higher compression than stock
3) they dont know what they're doing
4) they do know what they're doing, and are compensating for other non-stock parts that flow better than stock in certain areas
5) they have a very good idea on what they're doing and are doing it only in specific areas to cause the turbo to spool faster.