Hallo,

what do you guys do with the high vacuum part of the ignition maps when using race gas?
i.e. think about the following situation:

you tune an engine with race gas and advance the ignition at athmosphere pressure for lets say 4-6° over the stock value to reach MBTT, what do you do with the high vacuum section of the igniton map?

- do you rise them also 4-6° to get a smooth looking map
- or do you let them on stock values.

i ask because in a stock map you have allready ~30° of timing in this section and i think increating the advance in this area is useless because thats not the area where you product torque so why should i add timing there?!

but if i don't change the values in this are the map looks very bumpy and has a huge step depending on how much i advanced the timing in the atmosphere and boost section.

how far can you typicaly go with the timing in the high vacuum areas? what is dangerous to the engine? (i know that is very general but i think there is a general rule of how far i can go)

 

noone?