Turbo install on my 300E - PeachParts Mercedes-Benz Forum

waynesworld · #11 06-13-2002, 11:46 PM

invisik, Steve11

The manifold was tough to fabricate given the limited space available. I used 1/2 in plate for the flange which mounts to the head. This allowed for porting of the 'ovaled' header tube to the siamesed dual exhaust ports of the M104 (24v) head. The tubes are .065 in wall (16ga) 1-5/8 in diameter stock from 'Miscellaneous Bends' from schoenfeld headers: http://www.schoenfeldheaders.com/u_&_j_bends.htm

I cut, mitered, and mig welded all 6 tubes into the bottom of the collector in a 3x2 pattern. I then finished the collector with the 1/2 in turbo mounting flange. I will try to post some more pictures of the completed unit this weekend.

Speedtek,

I will follow your recommendation on installing a EGT fitting before I complete the manifold. I fabricated a support for the turbo by connect the two flanges with a support gusset. I will heat wrap and heat shield the turbine side. It took a lot of trial and error to find the best location for the turbo maintaining adequate clearance all around and to the hood. I plan on running either 2-1/2 in or 3 in all the way back to the Remus muffler.

I am interested in your comment on the trim of .63 vs .48. The car is an automatic. I have a goal to hit a reliable 325-350 hp. Using the Mosselman twin turbo kit as a guide... they claim hp moves from231 to 320 and torque moves from 275 nm to 405 nm at 6psi boost with a small intercooler setup in the engine bay. Interesting to note that they do not use any additional injectors and only modify the control of the CIS-E and cold start injector through their own control unit which sits in-line with the factory controls.

Thanks for the advice on the fuel enrichment. I expect to spend some decent $$ on the fuel and ignition managment. I would be interested in anything you come up with there.

The engine designation is 104.981. The bore/stroke is 88.5/80.25 mm. The compression is 10.0:1. Max rpm of 7000. It has dohc with intake valve timing advancement from 1500 to 5000 rpm. The engine has piston cooling via crankcase oil pressure spray nozzels.

The engine condition is good with ~95,000 miles. I removed the head, replaced valve seals, head gasket, head bolts. The cylinder walls still had the factory cross-hatch honing pattern. I don't have valve sizes handy.

The intercooler I will be using is new for an Isuzu turbo diesel truck. Aluminum with 2-1/2 in inle and outlet. It will be located in the outside air stream. The size is ~24 in x 6 in x 3 in.

I'm interested in what you think the performance potential of this configuration might be.

Thanks...