s-company
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« on: October 09, 2010, 09:00:38 AM »
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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
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setzi62
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« Reply #1 on: October 09, 2010, 09:26:47 AM »
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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. |
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s-company
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« Reply #2 on: October 09, 2010, 07:20:49 PM »
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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
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« Last Edit: October 12, 2010, 10:22:41 AM by s-company »
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Tony@NefMoto
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2001.5 Audi S4 Stage 3
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« Reply #3 on: October 12, 2010, 10:55:39 AM »
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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.
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thom337
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« Reply #4 on: October 12, 2010, 11:42:19 AM »
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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.
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Rick
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« Reply #5 on: October 13, 2010, 09:15:02 AM »
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Do all 2.7T's have just the on/off rather than fully variable timing?
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Tony@NefMoto
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« Reply #6 on: October 13, 2010, 11:10:58 AM »
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2.7T intake timing adjustment is just on or off.
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Pilot
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« Reply #7 on: November 10, 2010, 03:30:57 PM »
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(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? |
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Tony@NefMoto
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« Reply #8 on: November 10, 2010, 03:32:18 PM »
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Glad you found the forum.
I think your assumption is correct.
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Pilot
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« Reply #9 on: November 10, 2010, 03:35:59 PM »
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Thanks Tony. So, you would say that 3,4 are for high lift?
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Tony@NefMoto
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« Reply #10 on: November 10, 2010, 05:16:45 PM »
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That would be my guess, since it is an additional mode.
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Pilot
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« Reply #11 on: November 11, 2010, 06:35:52 AM »
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...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?
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. |
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Pilot
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« Reply #12 on: November 13, 2010, 03:13:53 PM »
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I found this, and it complicates things a bit.  |
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turboskipper
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« Reply #13 on: November 15, 2010, 07:34:22 AM »
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I found this, and it complicates things a bit. Seems simple enough. Three types of spark control based on the cam configuration of the car. fnwue and wnwue are cam position info. |
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« Last Edit: November 15, 2010, 08:45:59 AM by turboskipper »
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Pilot
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« Reply #14 on: November 15, 2010, 08:38:26 AM »
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So, in the case of variable camshaft control (anything between 0 to 40 degrees in my car), how would KFZW2 come into play?
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