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Q: What is Twin Entry and why doesn't ST165 have it?
A: Quite a bit of the designs for the original All Trac were borrowed from the Supra Turbo. The original turbo design has a single inlet for the turbine. It also has a single flapper door for excess wastegate gas. The single entry types are known for cracking. What happens is alot of heat is created once inside the single inlet as all the gasses fight their way out, causing cracks. The cracks start inside the housing and work their way outward.
Twin Entry - The updated design of the CT26 consists of a stronger 6 stud pattern which prevents the nuts from backing off. The Twin Entry name leads to the fact that the inlet to the turbine now has 2 ports. 2 of the cylinders are dedicated to each port, in a specific pattern. What this does is give the turbine the exhaust energy in a way that would not allow the gases to hit each other. The wastegate even has 2 ports which lets the gas out still in a smoother pattern. This design offers faster spoolup, higher max HP capability, and prevents cracking.
ST165/Supra Single Entry
ST185/MR2 Twin Entry
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