what does the knock 0 1 2 windows mean on VEMS?

[popdemonic]

i just found the knock windows on the log view.what do they mean?
it always come with the various numbers on this 3 windows.does it mean
anything about detonation on my car?

[caterpillar]

http://forum.savarturbo.se/viewtopic.php?f=16&t=24775 here you does have the vems"guru" ask him... sorry the topic are in swedish; but he will speak english very well

[Jamo]

No ask here http://www.vemssupport.com/forum/index.php it's in english and Mattias is also a member

[KRIENG]

Pop easy to view by set showing graph like this
520 seem OK.

I found lean fuel before knock happen
we didn't correct VE in upper cell

[Billman]

Seems nice but I don't thing that it is correct and you can depend on it.

[popdemonic]

Hey Billman,
Here's the problem.recently oth of us has been running the VEMs w/o IAT working correctly
Since we forgot to upload another 2 patch files.the IAT seems to show 20-23 C deg. Constantly.
In this case,it means the ign/mat retard table was not working so after we have uploaded the
2 patch files.we found out that our VE table needs to be tuning again.the upper right table is running way leaner
than we had on stock IAT sensor.we're having some kinda detonation issue and we're sorting out the
Proper ignition table and lambda target.we're living under tropical weather in Thailand.it's hotter almost
Year which means we have less indense air and fuel quality.we have E10 E20 E85 fuel available.soon we're going to
get tuning with E85 for the better detonation resisted and performance side.the problem is we don't know how to read and understand the
Knock 0 1 2 3... Windows on the VEMs log view.how to identify the number if it's detonation or still on the safe side
For that number.I need to be stay tuned for a while until I got the better and cover all regions on VE table.

[Billman]

VEMS knock listening is not working well (yet?). You cannot depend on it. Use either knock box (phormula) or some mic on the block with your ears.

2-3 degrees would not be an issue.

E10 is much better than the 95 RON we get here.

[popdemonic]

Hey Billman,
yes,I'm asking Marc EFIexpress to build the knock headphone one for me.

recently,we're hearing kinda knock noise coming out.we're not running

too much aggressive advance ignition.since i have sent you a couple log files.

i have tried to mildly retard a bit on timing.unfortunately,it doesn't help much.

i have tried to set the lambda richer somewhere around 0.78-0.80 240kpa @ 3500RPM.

it helps to prevent from being detonated.one quick question.running the lambda at that

level with particular boost seems too rich?I'm running E20 on my car.soon for E85.

Thanks Mate,
pop

[Billman]

Whatever fuel use lambda 0.80 at high boost.

[popdemonic]

you meant any 0.7x on lambda is supposed to be too rich right?

[popdemonic]

here's my Lambda target though.

[Billman]

Set 240 at 0.82 lambda and 300 at 0.79.
Be sure that your lambda sensor reads correct.
If it knocks with that lambda then most probably something else is wrong.

[popdemonic]

early of this week,i still had imperfect VE table.i ran 0.83 lambda at 240kpa and heard some knocks.

Not sure if the bad VE table will cause the knock?now i have much more better VEtable(after a few times

of tuning)i'll see if it's still knocking.Thanks Billman!

[popdemonic]

one thing,I'm still running stock Intercooler since I'm molding the aftermarket RS2 style bumper for the FMIC.

Normally,the IAT readings 45-50 C Deg on cruising.on stop and go traffic,IAT readings 80-85C Deg.

[Billman]

I theory a bad VE table can have a lean spot and till the EGO correction takes care of it it goes away. Still be very carefull with the changes and avoid full throttle/boost runs at these high IAT till you can hear for knock and be sure about your map.

Have you checked the basic ignition timing with the timing light?