Few vehicles are as important to our world because the E46-chassis BMW M3. It’s snug, quick, balanced and dependable, and even the earliest examples have aged gracefully over the previous dozen years.
Many of the crashed and abused ones have been flushed from the market by now, and a few actually stellar inventory and modified examples stay. The aftermarket for the automotive …
The Artwork of Shoehorning
Whereas BMW has totally embraced turbocharging lately, the S54 engine discovered within the E46 M3 wasn’t designed with increase in thoughts. As a substitute, it was given massive cams, VANOS variable valve timing, and a lofty–for the time–11.5:1 compression ratio. Whereas the engine block was shaped from a tricky iron casting, the engine format didn’t go away a lot room for a turbocharger and manifold.
FSR’s resolution? Design a brand new turbo system for the automotive. To work across the tight confines of the E46’s engine compartment, FSR TIG-welded a neat turbo header that hugs the facet of the block whereas nonetheless permitting for 1.5-inch main tubes. The crew set the ultimate turbo place as excessive as doable, but selected to permit 4-inch inlet plumbing and a 4-inch down tube–FSR says that was vital for extracting most energy from the three.2-liter engine. The group additionally felt that the manufacturing unit composite manifold restricted top-end energy at full increase, so that they designed an aluminum alternative.
Tuned to the Moon
The important thing to creating all these parts work collectively is the engine administration system. AEM had simply launched their Infinity ECU software for the E46-chassis M3, and the brand new setup contains the flexibility to tune the drive-by-wire system in addition to each consumption and exhaust cam timing through the VANOS system.
“With management of the VANOS, this automotive makes increase earlier than your foot hits the ground and carries that energy to 8200 rpm due to the manufacturing unit CNC-ported head and massive cams,” Ian explains. “Opposite to common perception, energy may be made by modifying the exhaust cam timing on VANOS. It’s a small window, however while you discover it, the torque features are rewarding and really helpful for observe conditions.”
Then there’s the hyperlink between the ECU and the automotive itself. “The adapter harness that AEM made for the Infinity on an E46 is actually plug and play,” says Ian. “It suits within the inventory location–so that you don’t have wires operating throughout the engine–and installs in about half-hour. We’re utilizing the traction management that integrates with the BMW’s CAN system at present, and may simply arrange launch management or map switching utilizing the manufacturing unit cruise buttons by means of the Infinity’s software program. The system is so responsive that we permit the flex gas sensor to detect the gas sort and modify the maps accordingly primarily based on our programming.”
The mixture of the FSR turbo package and AEM Infinity ECU was the recent ticket. In its ultimate configuration, the M3 dynos at 500 horsepower on the rear wheels–and that’s at 8 to 9 psi on pump gasoline. At 17 psi on E85 gas, that determine leaps to 750 horsepower. Understand that that is all coming by means of a inventory backside finish, transmission and exhaust.
Due to the Infinity’s means to modify between gas sorts, the automotive can run E85 on the observe in addition to a extra simply obtainable pump-gas combination on its days off. Because of inline gas combination sensors, the ECU is ready to alter increase maps and interpolate between them relying on the share of ethanol flowing to the injectors.
FSR’s growth mule has now seen tons of of miles’ price of observe, drag-strip and dyno obligation with no notable failures. Maybe essentially the most superb factor about this automotive? Regardless of all that horsepower, the manufacturing unit head gasket continues to be in place.
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