M4.x turbo Volvos use a return-type fuel system with a rising rate FPR that maintains constant injector pressure differential by referencing manifold pressure. The pump runs at 100% duty, making oversized pumps problematic. Factory injectors, FPRs, and fuel trims are covered, with practical recommendations for turbo upgrades, E85, and NA-to-turbo conversions.
Download the latest version here. We’re proud to announce the release of a standalone, simple to use program for datalogging, flashing and code reading for Motronic 4.4. This program runs on both Windows and MacOS. There is no longer any need for complicated computer setup using the program TunerPro. An […]
What is coil on plug? Coil on plug (COP) gives you a separate ignition coil for each cylinder. Instead of a single ignition coil, ignition distributor and spark plug wires, there is an individual ignition coil for each cylinder. What are the advantages of COP? Stronger Spark With the single […]
When the VVT solenoids are left unpowered, the cams will be in their most retarded state. This cam position produces the greatest amount of peak power, at the expensive of low end torque. Therefore, without VVT control the engine will have a significantly noticeable reduction in power below ~4000RPM. When […]
1998 S70R with the factory installed 18t The first dyno (301/227) was with the stock tune, 3″ downpipe and gasoline. The second dyno (485/240) was with a VAST tune and E85 1998 V70R with GTX3071R This dyno sheet is from a full build completed in house. The car is a […]
