NefMoto

Hello!
Can someone explain me the difference between these 2 maps, why there are always 2 maps
on most Me7 ECUs?

KFZW
KFZW2

KFZWOP
KFZWOP2

Thanks for helping!
BR

Have a look at http://s4wiki.com/wiki/Tuning,
There is stated:
KFZW/KFZW2 - primary timing maps. ME7.1 has a two point variable cam timing system; there is a table for each cam timing state.

ok,
but some 1,8T (A3, S3...) do not have the variable cam timing, does that mean KFZW2 is inactive in this case?
Thanks
Best Regards

I'm the one that told everyone it is based on intake cam shaft advance. It's funny now this info gets re-posted on different sites.

One map is when the intake cam is at minimum advance, and the other map is when the intake cam is at maximum advance. The ECU interpolates the values based on the theoretical intake cam advance as it switches between the two.

I am not sure what happens on an ECU without intake cam advance. It would be fairly easy to test what happens though.

If no intake cam adjustment is present on the vehicle, it uses KFZW1. On motors where there is not adjustment only an "on/off" for the cam adjuster, it just switches maps from KFZW1 to KFZW2.

Do all 2.7T's have just the on/off rather than fully variable timing?

2.7T intake timing adjustment is just on or off.

(Hello to all, from a hobbyist tuner. This is my first post here - found NefMoto through googling this thread :) ).

On topic, the ME7.8, on Porsches, also has KFZW3 and KFZW4, and the corresponding KFZWOP{3,4}. What might these be for?

Later Porsches have the Variocam+ system: two camshaft lift profiles (low, high) along with continuous intake timing adjustment. Could the four maps correspond to different combinations of these, i.e., KFZW{1,2} for min,max intake advance when in low valve lift and KFZW{3,4} for min,max advance when in high valve lift?

Glad you found the forum.

I think your assumption is correct.

Thanks Tony. So, you would say that 3,4 are for high lift?

That would be my guess, since it is an additional mode.

I am looking at a 997s original file and it would seem that (opposite to what I write above) the odd-numbered maps correspond to the advanced intake valve timing. This is because they generally specify a lower ignition advance - which is consistent with the increased dynamic compression that would result from closing the intake valve earlier.

So the assumption would be:
KFZW{1,2} for max,min intake advance when in low valve lift and KFZW{3,4} for max,min advance when in high valve lift.

I found this, and it complicates things a bit. :)

(http://nyet.org/cars/images/KFZW-vs-KFZW2.jpg)

Seems simple enough. Three types of spark control based on the cam configuration of the car. fnwue and wnwue are cam position info.

So, in the case of variable camshaft control (anything between 0 to 40 degrees in my car), how would KFZW2 come into play?

Looks to me if that is the correct fdef that it would not be used. Check SY_NWS but my guess it that it is set to 2 so you only use the bottom most map.

I think it probably is wrong for my software. I have four KFZW* maps, no 2D map like the bottom one, and KFNWS* maps to control camshaft timing.

I can only report that on the 1.8T, no cam phase change, engines I've been asked to disassemble recently by some folks here only one timing map is called upon.  However, the second map exists and is populated by the exact same data points.

hi

would it be possible to switch the system constant SY_NWS = 2
i would like to have variable camshaft control.

(http://nyet.org/cars/images/KFZW-vs-KFZW2.jpg)
[/quote]

You can change the constant to enable support for different ignition timing maps, but there won't be any system setting what current camshaft phase is, so it would always use the first map.

Sorry for digging,
but has someone found out which KFZW belongs to which Position of Valve-Lift and Timing in the Porsche Files?
Cause based on my Analysis of KFZW1-4 i would assume that the areas are divided like this:
KFZW1 - vlow + late timing
KFZW2 - vlow + early timing

KFZW3 - vhigh + late timing
KFZW4 - vhigh + early timing