Turbocharger BorgWarner or APR

I went with a BorgWarner S257SXE... 515hp at all 4 wheels on Ethanol at around 21 psi. Spools faster than OEM twins.

man those EFR turbos were fucking lit.

Quite a few years ago I bought a Borgwarner EFR6758 for my build, and it was a stellar little unit.

The absolute cheapest brand new turbocharger you can buy for those engines is an aftermarket BorgWarner and will set you back no less than €1000 + shipping.

Currently at 97K, went APR 87 IS20 at 81K about this time last year. Was 87 stg 1 IS12 at 64K spring 2021. So far only issues was wastegate related from my used turbo, and oil consumption.

About a year ago, I installed the DTR6054, HPFP and LPFP, APR's Intercooler, intake, and of course the necessary tune and TCU tune to run the car on 93. I have quite enjoyed it over the last year, but it did lose some of the punch at low RPM that it had with the IS38 turbo and Stage 1 tune.

After the stage 1 APR tune almost immediately roasted my IS12's wastegate, I'm about 4 months into an APR stage 3 IS20 setup. Aside from a persistently unenjoyable power delivery, the car's been reliable so far.

There are IS38s that have failed under stock conditions. You're not going to gain much insight here. Some fail, most don't.

I have this turbo but t4 twin scroll with bigger AR. It is too small on my half Bridgeport 6 port turbo fc.

3 weeks after posting this and my turbo locked up on the hot-side... Car ran 10 degrees hot out of nowhere and then a loud pop followed. Checked everything and it seemed okay. Except the turbine wheel didn't want to spin. Absolutely locked up. Friend driving behind me saw more black smoke than usual during the pull followed by a blue-white "puff" which we agree is when the turbo died.