I am cheap, lol.

If I can fit this 61mm turbo, I can fit any 6x mm turbo I think.

 

That'll be a really sweet setup if you can pull it off. Keep us posted.

 

First runner getting fit from metal. I crushed the end of the pipe into a rectangle shape with the press. The typical 1.5" pipe circumference is almost the same as the divided ~2"x1.35" opening in the flange. This won't have a typical merge collector due to space.
















First runner completed. I usually bend the flange straight after each runner is welded to it. Typically the outsides will pull away from the mounting surface.

 

Very cool man! Love seeing your progress.

 

Which 300 series turbo is that? For what its worth I ran a couple different divided housings on the s257sxe. on a F24 the .83 housing was too small for any good top end power. It would spool that thing leaving the stop light though. I went to a 1.0 from there which netted almost 600hp. Seemed to be the right choice over anything larger.

Currently using a S364.5 on a divided 1.0ar housing. It actually spools surprisingly fast. On straight gate with no pressure on top and the same ignition map as before it lights off hard at 4700 rpm. I imagine once I get the motor broken in and the boost controller and IG map on point, it should light off a few hundred rpm sooner. That's with a 3.5" downpipe though.

Im super curious how you plan to fit a downpipe in that setup. I started to do a similar side mount setup and changed my mind real fast when I realized I'd have to run a side exit exhaust to have any kinda decent size exhaust piping.

 

It is the smallest s300. It is the ~61.4mm compressor wheel. On 93 it can feel lazy to me at times. On ethanol it feels pretty good.

Logs show (rolling into it in 3rd gear - 65° ambient temp):
10psi at 4300
20psi at 5000

I forget if this is with the .91 or the .83 housing.

I think I'd be on the edge of a s257. I think I have the right turbo for this price range. Just think it would work just a little better with maybe a 64mm turbine wheel.

Downpipe will be a challenge. It may need a cheater-cut tube coming off the turbine, but I don't think using 3" will be an issue. Will expand it to 3.5" when the space is available. Wastegates and recirculated dumptubes will be tight as well. Worst case is cutting the housing and welding a 3" elbow straight to it.

 

Not sure if you stated it, but what kinda max power are you looking for?

Also, I cant really tell from the pics, but did you find any width differences between the different size turbine housings on the 300 series? I'm itching to get a smaller housing just to see the difference in spool on this s364, would make life alot easier if it were a simple housing swap instead of having to modify it. The turbine housings for these turbos are so damn cheap. I wish other manufactures would take note.

 

I am hoping to trap around 140....so I think about 620-650whp will get me there. I will be limited by my injectors (id1300) before anything else I think.

Width differences between the mounting flanges? So far the turbine housings seem interchangeable with each other. The t4 flange looks to stay in the same spot in relation to the turbine outlet. You are right about borgs parts being cheap, probably the biggest reason I am staying with Borg Warner so far.


Some pics of the flanges matching up.

1.00 vs .91










1.00 vs .83

 

Yeah, I believe the outer housing area stays the same and the differences in AR happen within the inside runners. I believe most manufactures do it this way, so they are interchangeable and keep installation into the vehicle easy for everything to align.

 

4th runner pretty much welded on. 2nd runner is about 90%...still needs the merge piece cut from metal. Once I get a 90° elbow welded to the compressor housing I can figure out the space for the 1st runner.









A few of the fittings that I cut. I fit them mostly with 30,45,60,90 degree sections. Grinding the bevels on them is probably the most tedious process.




























Some in-car pics. I think it came out decent. 3" will fit easy. I was able to also fit a 3.5" bend in between the frame and the motor (not pictured).











The downpipe mock tube has a CLR of about 4-5". This pic is just how tight of a radius you can readily buy with 3" (not to scale).