e30 m50/m52

[sidewaysbill]

the super duper fancy camshafts finally landed today , next thing get the finger out build it , fit VEMS and map the S**T out of it.....!

[PeepPaadam]

I installed VEMS on M50B25 equipped E30 carbio last summer and it worked like a charm even without overlapping dwell. It's a non-VANOS engine though I recently installed VEMS on Mercedes 190E with 3.2liter 24valve engine from 1996 S-class that has some sort of "variocam". It's a simple on/off type and  retards intake cam below 2000 rpm, then goes normal position and retards again after 5000 rpm.

We dyno-tuned the car without it (255 hp/380 Nm) and next session we're going to play with the cam timing as past 5000 rpm torque and power fell off like a rock without the cam retard.

[z0tya]

has anybody a safe spark map for m50b25?

I found an oe. map, but it is load/rpm not map/rpm.


Do you think is it usable for start?

[gunni]

You should be able to estimate a 100kpa from the load and use those ignition values.
Obviously 100kpa is not the same load in kg´s/s as used by motronic.

Maybe 3.2 is 100kpa@800rpm and 8.2 is 100kpa@6400rpm?

[multiplex]

is this a boosted motor? or NA

if boosted i wouldn't run that high of timing values.

I think my max timing in full boost is around 15.

I was kinda under the impression the spark maps were a modifier on a base timing number. The top row values seem too low

[gunni]

They are based on actual load which is mass of air per second. You can reverse calculate your MAP based setup to reflect that if you must know the exact VE of your engine and how much air mass it´s inhaling.

Not TPS and not MAP.

The 6.6 number might be 3bar boost if your getting that at 1000rpm . So that ign value reflects that.
But at 5k it´s only 80kpa on that engine.

That also might be the full MAF scale on the M50 80mm maf. So that doesn´t mean that a WOT standard M50 even reaches the 6.6 load at highest rpm.

[z0tya]

it is a full oe. NA engine. So rpm midrange and up about 24 deg usable at wot?