Ok, the new screw arrived. The T78 was acceptable back when the engine build was for a top end car, but with the broken block build and its lower power figure and the focus being on response, that ancient, slow spooling design is a non-starter. No, I want the turbo to scream onto boost. There were a few on the list of possibles. The GTX3582R and the Borg Warner EFR 8374. Both are a little large, but they offset that by being much more efficient than the dated Greddy unit and also have a lot of overhead so I might be able to use them on the next build. Unfortunately, both are not cheap being ball bearing types, are thus not easily rebuildable if something should go wrong. You know, like if you had a sketchy block that might spring a leak at full scream. I'm already risking my stroker kit, I'm not going to double down with a bleeding edge level turbo. I went with the Borg Warner S300 SXE. Here it is next to the T78.
It's a bushing turbo, but has a 360 degree thrust bearing and with the billet wheel, antisurge compressor housing and capability to mount a wheel speed sensor, it's not exactly "settling," but if something goes catastrophically wrong and the turbo gets shredded, I'm out $1200, not $2400. It's the 64.5 wheel and I opted to kick in a little extra to get the black ceramic coating on the exhaust housing. I chose the 0.91 back side to further emphasis response. i can later switch out to a larger backside if this turbo carries over to the next build and I want to see just how crazy it can get.
