I'm looking at purchasing an s475 to replace my s366 I got unintentionally.. I found a boostlabs s475 83 .90 T4 for sale brand new for $600 on marketplace.... I would be using it for twins so the t4 has got to go.

 

   I hear there are 2 different CHRA's on the t4 vs t6 turbos. That being said how would I go about swapping to a 1.10 or similar t6 housing. Need completely new bearings housing and turbine housings?? That sounds far too expensive to be worthwhile. From what I can tell the bearing housings a mostly identical except for the diameter where the exhaust housing clamps on. 

   

   Also what's the deal with the 83/74 and 87/80 and 88/96 wheel sizes. Which would work best with a 1.10ish housing? I plan on running ported hx35/s475 but will probably step up to a 62mm secondary eventually. 

 

This medium and large frame s400 crap is throwing quite a bit of complexity into finding a usable turbo in my area used.

What size injectors are you running? Strangely enough I'm running 150's and still running the stock HX35W (54/60/12). I might be able to tweak your tune a bit and help out with keeping the EGT's down. There is several tricks I've learned about tuning that managed to allow me to run most daily driving and towing without issues of EGT's. Might give me a call and I'll do what I can to aid in this build.

So I'm running 7x10 vco's. I picked them up recently with a s366 and some compound piping. I grabbed a pop tester on eBay and cleaned swapped and shimmed the OEM injectors with the new tips. My local injector shop said 160 an hour to shim my injectors leading to me doing it myself for a little cheaper.  Needless to say I am no longer running wire tap and much less duration.. I have an SO pump so the tired h/o injectors requires a lot of duration to get power down low.

 

   EGT's are a non issue for me right now with the water meth even with relatively fat fueling curve and not a lot of cfm. 2 stages at around 10gph combined @30psi boost. I Missed out on an aem flow gauge that was for sale near by so cant give you specific cc/min.

 

 I appreciate the help. I still haven't picked a turbo I want as a primary. I'm doing a budget street build to push the limits of driveability and peak power of the SO VP. Specifically I want a truck with minimal turbo lag and the ability to make 600+ HP. I plan on testing a d-valve out on the compound set up.

 

Right now I'm mostly focused on finding a primary.

Edited September 15, 2024Sep 15 by QuadRunnerJake

By the way @Mopar1973Man the only reason I decided on the 150's was because of your experience with them. I am very happy thus far. I haven't had them in long enough to really tune them for the stock hx.. but at 320bar im relatively happy with the smoke control with the mild fuel curve I threw together thus far..