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By joshuaho96 · Posted
GTX2860R Gen 2 is an option. No, it doesn't actually do much. The basic problem with wanting 600 whp out of the factory twin turbo setup is a few things. One is that the twin turbo piping is just so, so inefficient. The front and rear turbos are not actually working evenly. The rear turbo is always moving more air than the front. On top of this the OEM rear compressor inlet is rubber that likes to collapse causing a huge intake restriction. The merge doesn't even wait until the intercooler to happen, and it happens at a 90 degree angle. This is why you see some discussion about "turbo shuffle", where in certain conditions one turbo can actually force air to go backwards into the other compressor and stall it out, then once the other turbo recovers it stalls out the first turbo in a cycle until you do something to break out of it. The other issue is that the RB26 is just not that efficient an engine. It needs a surprising amount of ignition timing to reach MBT for a given cylinder pressure so all that time in which the cylinder is pressurizing before TDC is just wasted energy. An N54 might be around 10 degrees BTDC on a stock turbo getting into the boost. An RB26 is closer to 25 BTDC. Net effect is a turbo roughly the size of what HKS uses on the GTIII-SS (smaller than the R3/GCG Japan "GT2860-1" -7s) is only good for maybe 550 crank hp or low 400 whp while a roughly comparable turbo on an N54 can deliver something like 700 crank hp and obviously drivetrain losses are greatly reduced when you aren't burning a bunch of power on keeping a hydraulic pump + transfer case preloaded all the time. So yes, you can make a lot of power but there's a reason why people go single turbo for the numbers you're asking about. Don't forget that the RB26 can't even do a straight line pull without oil starving on the stock oil pan either. Baffles can help, but really you just need more oil capacity. -
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Found some from 2009. The lobster bends were smoothed out on the inside with minimal gaps (perhaps 2mm) where the silicone joiners were used. -
And if you have to drive it in a civilised (or excessively woke) US state, find a way to register and insure it in a redneck state, so you can roll coal in it without worrying about legalities.
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