VEMS Ign. Table, how much advance ?

[Erikk]

how does spark delay work? does it mean that the advance can be reeuced selectivwlly on a cylinder so as to reduce the chance of knock?

Yep

Hi,

i seen at the new Vemstune 1.1.81 the inj. angle curve, what angle setup must i use ???

Thomas

You dont have to use it, put 720 in all cells do disable it - if you want to try, then its test'n'tune as they say

[th.b.w.]

Hi,

i seen at the new Vemstune 1.1.81 the inj. angle curve, what angle setup must i use ???

Thomas

[A80Avant]

how does spark delay work? does it mean that the advance can be reeuced selectivwlly on a cylinder so as to reduce the chance of knock?

[th.b.w.]

Hy,

the piston land from cyl 4 is to much damaged, i change them....


@Erikk
This sounds fine, than i will change to 1.1.81 and see how it works......Thank you


Thomas

[Erikk]

Hi,

is there an possibility to adjust ign. timing cyl. selektiv with VEMS to decrease the advance a little bit ?
Let say 2-3° ???

After rebuild the valve i can't see where the steeldrop is going to..
The Turbo hotside is o.k., no damage..

I will only change the Valve and it is o.k.

Tomorrow will rebuild the pistons and see the ringlands...

Thomas

You want to delay the ignition on just one cylinder?
You need one of the latest firmwares like 1.1.81.

Then you have it under Base Setup -> Cyl seperated Spark delay

[th.b.w.]

Hi,

is there an possibility to adjust ign. timing cyl. selektiv with VEMS to decrease the advance a little bit ?
Let say 2-3° ???

After rebuild the valve i can't see where the steeldrop is going to..
The Turbo hotside is o.k., no damage..

I will only change the Valve and it is o.k.

Tomorrow will rebuild the pistons and see the ringlands...

Thomas

[GazzaG60]

heat is ok to an extent. bad afr will not help. look to the weakest fueled area also. the one farest from the tb usually. it gets the most air.

[A80Avant]

would that be a solution for 3d cylinder which usually gets hotter then? just to keep it slightly richer? sounds a good idea. Has anyone tried it?

[Jamo]

I think the cyl 4 is the hottest, is there an possibility to adjust the cyl. selektiv with VEMS to run these a little bit richer ?

Tomorrow i will rebuild the valves ...

Thomas

Yes in the higher firmwares injector trimming per cylinder is available

[A80Avant]

mine should definitelly have some pitting as i have heard it while tuning! but dont forget that engines can endure knock for fairly long period of times. Its preignition that will shatter them. And that can also come with very low timing as well.

[th.b.w.]

Hi, the first look wasn't right....

I have cleaned the pistons and head, now i see pitting on cyl. 4 more and a little bit on 3 .
I wonder that it is only on the intake side.....

Now i will check the injectors and send this to a flow tester....

I think the cyl 4 is the hottest, is there an possibility to adjust the cyl. selektiv with VEMS to run these a little bit richer ?

Tomorrow i will rebuild the valves ...

Thomas

[a4kquattro]

Hi, so i have removed the head.

There is no point to say that there is knock.

All Pistons and heads look pretty good without any pinging or melted aloy....


Thomas

you cant necessarily tell from just looking at the top of the piston that there is no knock. how is your compression? one of the first things to take a beating are the rings and the ring lands on the side of the piston as the high pressure spike from knock pushes on the rings.

[th.b.w.]

Hi, so i have removed the head.

There is no point to say that there is knock.

All Pistons and heads look pretty good without any pinging or melted aloy....


Thomas

[A80Avant]

no i dont. I have more timing than you if i judge from the map, from day one, and havent had a problem. Of course the compression ratio is different but very small difference. Also i have seen other maps with even more aggresive timing. I think its just bad luck and unfortunate cause i recently read another broken bosch plug...Is the quality going bad here?

[th.b.w.]

Don't you realy think it comes from too much ign. advance ?

Thomas