BMW E30 M20 VEMS,turbo

[gox]

hahaha you "drag race" guys are really crazy,MWfire also said that 1bar is low boost lol

By said overfueling i mean at VE map that looked waaaaaay diffrent with 1.0.73 firmware...now its all ok

[gox]

Here is a little update
After one year car started drifting again and in last race (two weeks ago) a found two pistons broken (cyl 2 & cyl 3).
After car was tuned i turned cam 4deg backwards and didnt do any loggin or tuning (yep,stupid me) so i supposed that would be a reason for geting knock and ending up with two broken pistons,i replaced the pistons (no damage to the engine block) and returned the cam to the original position where it was maped,at the same time i replaced the old H1C with KKK K27.2 and do some logging....here is what i found:

VE table with H1C



Here is remaped VE table with KKK27.2,she runs little rich...this was remap before drifting,to keep it safe...




Is this an example of compressor of H1C going out of the VE limits for my engine? Since its has noticeable drop in VE value over 5000rpm...

Here are the pistons....R.I.P

Cyl 2


Cyl 3

[gunni]

Since the K27.7 most likely has a bigger turbine or at least a more effective turbine this is how that shows up, no drop in VE up the rev range.
Any more details on the turbos?

[gox]

i think i wrote you the details on youre topic about k27.2 @ e30tech.com....

[GintsK]

VE table alone, or even entry tuning do not give guaranty of engine survival.
So many factors can lead to knocking...

My way is to tune VE table as precise as possible, to get idea how close or far is knock limit advance-wise, and leave EGO correction ON also at full load. Last one seems incorrect to many tuners. But my experience shows - it saves engines. Many engines! And what is important - WBO2 oxygen sensor failure in VEMS case do not lead to engine damage, just power hurts a bit because of PW fluctuations.

Also VEMS offer plenty of safety features. Use it!
What we miss currently is possibility to protect engine in overheated situation - remove boost, advance, add fuel (partly can be done by WUE). And working knock ctrl in official branch, off course.

Gints

[gox]

The car feels  like twice stronger then with h1c....i just cant believe how huge the difference is.
I will hit the dyno next week to check the power results...