Twostep charging twinturbo-project on w124 OM603

[Johnswe]

Good evening 'all! First post on the forums, seems nice apart from my lack of capabilities reading finnish.

Im having this project on a '88 w124. Used to be a petrol 300E, but is now converted to the OM603-engine.
Building a setup based on twostep charging - two turbos with different size to reach low lag and high pressure. We'll see how that will work on a small engine like this.

My engine is the 603.912, nonturbocharged from the beginning. Am I correct to say that the weak point on this engine is the pistons?
What can I expect if I try to reach over 400whp with this stock engine?


I am pretty much ready to send my pump for modification. Planing to send the pump to Mynä - Ive heard they are the best at what they do. I have seen a phonenumber to Mynä, is that the best way to get in contact with them?

[winmutt-]

Its more than just the pistons. The crank, the valves the under piston oil squirters. You are better starting with a turboed eng and then working your way up.

[Forced_Induction]

Building a setup based on twostep charging - two turbos with different size to reach low lag and high pressure.

You would be better off using a single VNT/VGT turbo. A GT3788V or Holset HE341Ve will spool just as fast as, if not faster, than a twostep turbo setup and easily support 400hp.