The MHD tuning platform for BMW N55 engines has evolved significantly over the years, with various versions and map revisions. While newer iterations exist, many enthusiasts still hold the V5 E40 map in high regard for its aggressive performance. This article explores the enduring appeal of the V5 E40 map, particularly when paired with Delphi coil upgrades and a flex-fuel system.
The author’s personal experience highlights the potential benefits of revisiting the V5 E40 map. After upgrading to a Motiv Flex Fuel kit with a Continental ethanol sensor, the author observed significant timing corrections and lower boost targets with newer MHD maps. Switching back to the V5 E40 map, while maintaining the same ethanol content and environmental conditions, resulted in a noticeable performance improvement, with reduced timing corrections and increased boost targets. This observation raises the question of whether the older V5 E40 map might still offer superior performance in certain setups.
While MHD recommends using the latest map versions, the V5 E40 continues to be a popular choice, especially among those seeking maximum power on E40 fuel. When combined with upgraded Delphi coils, known for their robust spark delivery, the V5 E40 map can potentially unlock even greater performance gains. The Delphi coils provide a stronger and more consistent spark, ensuring optimal combustion, especially under high boost and demanding conditions often associated with E40 tunes.
The author’s vehicle modifications, including VRSF catless downpipes, a GENUINE BMW Performance Exhaust, VRSF charge-pipe, HKS blowoff valve, MMP inlets, a G-Plus intercooler, AD Engineering PCV delete, Motiv Flex Fuel kit, NGK spark plugs, Delphi coils, and an XHP Stage 3 Transmission Flash, provide context for the observed performance differences. While this specific setup demonstrates the potential advantages of the V5 E40 map with Delphi coils, individual results may vary.
Factors such as fuel quality, environmental conditions, and specific vehicle modifications can influence the performance of any tune, including the V5 E40. It’s crucial to monitor engine parameters and ensure proper maintenance when running high-performance tunes like the V5 E40.
Ultimately, the choice between the latest MHD maps and the classic V5 E40 depends on individual preferences and vehicle configurations. For those seeking aggressive performance on E40 fuel, especially with supporting modifications like Delphi coils, the V5 E40 map remains a viable option. However, consulting with experienced tuners and closely monitoring engine data is essential for maximizing performance and ensuring engine longevity.
