BMW E30 M20 VEMS,turbo

[gox]

Since i have a poor quality fuel,i buy it like 95 octane but it is actually 92-93 (as they say) i cant get rid of the knock for a few weeks now...

Here is the Ignition map from Mattias,it was my starting point:



Here is the table after retarding and i`m still knocking...



I have msq and a log from a last night but i cant upload it vems.hu is down currently...
.

 

[gunni]

where did you get 66deg from?
did you check it with a timing light?
Mine is spot on at 72deg. Which might put yours off of about 8deg in total i.e more advanced., give or take a couple of degress.

Have you checked with a timing light?

[gox]

Here are my settings, i checked them yesterday with the timing light at 0deg with mda01 and its fine...

[gox]

What is youre trigger tooth 3 or 5?

Here is the log and MSQ file:

http://www.vems.hu/files/MembersPage/MilanaPerisic/turbo/run4.xls
http://www.vems.hu/files/MembersPage/MilanaPerisic/turbo/turbo.msq

[gunni]

3

[gox]

Drifting at Greece,Serres circuit

[AVP]

where are you from?

[gox]

I`m from Serbia,Novi Sad - the city at northern part,~130km to Hungarian border

[AVP]

I see, that is why Greece is near there!!Im from Greece

what kind of compression do you run on the motor? your advance is quite small on the top end.What kind of turbo are you using as well?

[gox]

Ooooh cool

Its a 8.5:1 and its a huge Schwitzer S3 turbo,i will switch to Holset HX40 over the winter,since drifting season is over

Yes,advance is small,everything bigger and it starts to knock... 

[AVP]

even with 8.5:1 compression it knocks? that is interesting.esp since you only run up to 1.5(250kpa) bar boost.

have you checked that the ignition timing trigger is correct with a strobe light? It will make a big difference

im going to fit an HX super 40 on my rs2 next year as well.

Why are you changing from schwitzer to holset?

[gox]

yes,i`m running only 1bar boost but tables are up to 1.5bar
I did check the timing with strobe couple of times and its fine,i think the main reason is low quality fuel...

I`m going to HX40 because its a smaller turbo and i`m using this car for drift only,so i need as much torque as i can get down low,but i need high range of power also,up to 7000rpm...

[gox]

Tables currently running:

[GintsK]

even with 8.5:1 compression it knocks? that is interesting.esp since you only run up to 1.5(250kpa) bar boost.

have you checked that the ignition timing trigger is correct with a strobe light? It will make a big difference

Audi is more like exception not rule!

[gox]

looks likes engine likes this ignition....been drfting with it for year and a half now and now signs of any damage,i opened the engine when i was switching the chassis,everything looks the way it was when i build it