VVET and recalculating the MAP zones..

[Redline Motorsports]

When using the VVET method, how do can you properly calculate out the MAP zone boundries when done? I assume that these boundries are key to completing a clean tune transition?

Why does GM break the table into there boundries anyway?

Howard

[GMPX]

The MAP Zones should be something that you alter (if at all) before you begin tuning the VVE table because it makes a major difference to the calculations.
I don't know what method GM use to determine what they need, but basically the wider the area you can define the better. So if you need to tune up to 200kPa then best to spread out the zones to give better coverage (look at the MAP zones on GM's boosted applications). In doing this it will allow EFILive to calculate the VVE better for each zone rather than being constrained by GM's compacted zones.
Look at a stock Vette -

RPM Boundaries MAP 1 MAP 2 MAP 3 MAP 4 MAP 5
RPM Section 1 _30____45____60____75____90
RPM Section 2 _25____45____60____75____90
RPM Section 3 _21____45____60____75____90
RPM Section 4 _21____45____60____75____90
RPM Section 5 _21____45____60____75____90

Assume the engine has a decent size cam, MAP1 is a total waste as you have assigned the entire column to kPa values between 21 and 30. The effect that has is you end up with a bunch of cells in the VVE table that are worthless for tuning.
Something like shown below would give you more control over the area's the cam engine will be running in. As you now have the zones 10kPa apart in the area that will need tuning.

RPM Boundaries MAP 1 MAP 2 MAP 3 MAP 4 MAP 5
RPM Section 1 _35____50____60____75____90
RPM Section 2 _40____55____70____80____90
RPM Section 3 _40____55____70____80____90
RPM Section 4 _40____55____70____80____90
RPM Section 5 _40____55____70____80____90

But as I said above, once you change these zones (and the RPM Zones) the entire VVE will need to be retuned, in fact, it will probably make a total mess of it. Also, once you change the zones you need to reopen the file in the Tune program to see the changes (Thanks Delco).

Cheers,
Ross

[Delco]

The MAP Zones should be something that you alter (if at all) before you begin tuning the VVE table because it makes a major difference to the calculations.
I don't know what method GM use to determine what they need, but basically the wider the area you can define the better. So if you need to tune up to 200kPa then best to spread out the zones to give better coverage (look at the MAP zones on GM's boosted applications). In doing this it will allow EFILive to calculate the VVE better for each zone rather than being constrained by GM's compacted zones.
Look at a stock Vette -

RPM Boundaries MAP 1 MAP 2 MAP 3 MAP 4 MAP 5
RPM Section 1 _30____45____60____75____90
RPM Section 2 _25____45____60____75____90
RPM Section 3 _21____45____60____75____90
RPM Section 4 _21____45____60____75____90
RPM Section 5 _21____45____60____75____90

Assume the engine has a decent size cam, MAP1 is a total waste as you have assigned the entire column to kPa values between 21 and 30. The effect that has is you end up with a bunch of cells in the VVE table that are worthless for tuning.
Something like shown below would give you more control over the area's the cam engine will be running in. As you now have the zones 10kPa apart in the area that will need tuning.

RPM Boundaries MAP 1 MAP 2 MAP 3 MAP 4 MAP 5
RPM Section 1 _35____50____60____75____90
RPM Section 2 _40____55____70____80____90
RPM Section 3 _40____55____70____80____90
RPM Section 4 _40____55____70____80____90
RPM Section 5 _40____55____70____80____90

But as I said above, once you change these zones (and the RPM Zones) the entire VVE will need to be retuned, in fact, it will probably make a total mess of it.

Cheers,
Ross


It does make a mess of it but if you save the previos iteration of tune , then copy and past the old VE table in the recalculate it works fine , one point is you need to close and then open the tune for the editor to redraw the zone boundaries properly

[Redline Motorsports]

It does make a mess of it but if you save the previos iteration of tune , then copy and past the old VE table in the recalculate it works fine , one point is you need to close and then open the tune for the editor to redraw the zone boundaries properly

I'm not following you with this??

[Redline Motorsports]

Ross,

Thanks for that explanation. If you change the MAP boundries; does it change the "shaded" areas in the VVET accordingly?

Howard

[Delco]

Ross,

Thanks for that explanation. If you change the MAP boundries; does it change the "shaded" areas in the VVET accordingly?

Howard


yes as long as you save the tune then reload it back into efilive