New turbo for old wagon - Page 4 - PeachParts Mercedes-Benz Forum

duxthe1 · #1 11-12-2018, 09:33 PM

It's a day I knew would come eventually, the turbo I installed on the wagon about 40k miles ago is starting to crap out. It's way too small and I spin the ever loving dog piss out of it, so this isn't a surprise. It is, however, an opportunity to put a more appropriately sized turbo on the old girl.

I've spent the past week shopping around and ordered the replacement this evening. It is spec'd as follows: T3 .63 AR turbine housing, stage 3 turbine wheel, T04E 50 trim compressor wheel in a T04B compressor housing, journal bearing center section.

The .63 turbine housing may still be a bit on the small side for a 3 liter motor but huge peak numbers are still the lowest priority for my AWD auto wagon. It's certainly more appropriate than the old .48 housing, though I may miss the ability to power bake and launch with 6PSI in the manifold. The "stage 3" wheel, wasn't selected for any real reason other than that's what almost all of the turbos I considered were spec'd with.

The T04E 50 trim wheel was chosen over the 54, 57, and 60 trim options. It's map's highest efficiency island appeared to be where I'd be using it. The 57 and 60 both could make more peak power, but area under the curve is what I'm shooting for. The T04B housing may loose a few CFM compared to the T04E housing at peak, but having the simpler packaging of the smaller "B" housing will make this more of a drop in replacement.

This turbo should be capable of 450hp without pushing it very far out of its efficiency range. I doubt I'll shoot for that, will have to see how much my injectors can support, and whether my cold side plumbing doesn't hit the wall before the injectors do.

All I can do now is wait for shipping, but will update along the way.