Why Spool AFS? Injector Differential Pressure Under Load on Two PTE 6870 B58 Builds

Two PTE 6870 B58s with matching turbos, injectors and MHD+ PI+ tunes, logged in fourth gear. The 440i on the Spool Auxiliary Split Fuel System held 31.6 psi of injector

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McLaren 720S / 765LT Turbo Inlet Failure: The Small Part That Can Take Out an Expensive Turbo

On the M840T-powered McLaren 720S and 765LT, the factory turbo inlet design has a known weak point: the internal silencer, baffle, and glued coupler area can come loose. When that

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Why You Can't Share the Low-Pressure Feed Between Your Port Injectors and HPFP

If you're building a dual-injection setup—port injection running alongside direct injection—there's a temptation to simplify the plumbing by teeing off a single low-pressure supply to feed both the PI rail

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Spool Performance G90 ZF8HP100 Stage 2 Transmission Build

Spool Performance G90 ZF8HP100 Stage 2 Transmission Build A Ground-Up Redesign for the Heaviest, Highest-Torque 8HP Platform  The BMW G90 M5 and M5 Touring introduce a new era of drivetrain

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