Motronic 4.4, along with most engine management systems, use a combination of mechanical and electronic systems to control boost pressure. This article explains: 1. The Three Pieces That Control Boost Boost control is dependent on these three components: You can think of boost control as a combination: 2. Wastegate Actuator: […]
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The Volvo 5 cylinder whiteblock turbo motor came with three types of exhaust manifolds. The 850/early P80 manifold, #1270242009, was fitted to 1992-2000 engines. The ‘Japanifold’, part #9207688, was fitted to 2001-2004 engines. The ‘R’ manifold, part #30637921, was fitted to all engines 2004+, not only the S60R/V70R, as is […]
Update 1/26: We now offer a plug-and-play wideband controller, which you can find in our store here: https://vasttuning.com/product/plug-and-play-wideband-controller Wideband lambda control (sometimes called wideband regulation) is when a wideband sensor’s signal is used by the ECU to control closed-loop fueling. M4.3/M4.4 equipped cars—such as the 850 and the 1998 V70, […]
The short story – upgrading your MAF housing isn’t about reducing a restriction in the intake system – it is done to allow the ECU to measure a greater amount of total airflow, so that the engine can be tuned accurately. The long story – the MAF uses a heated […]
The factory fuel pump wiring on P80 Volvos is insufficient at providing enough power for upgraded fuel pumps. As counter intuitive as it may seem, sometimes upgrading a fuel pump without upgrading the wiring can actually decrease fuel flow. This is because larger pumps require more power to flow the […]
The purchase of a ‘Tune It Yourself’ ECU comes with support only for hardware. At the time of purchase a minimally modified base tune will be emailed to you, as well as flashed to the ECU prior to shipment. This base tune is a factory 607 or 608 ‘rev5’ tune, […]
Datalogging is the keystone to high performance engine tuning. From the factory, there is only one practical way to datalog information from the ECU; via OBDII. Unfortunately, from a tuning standpoint, OBDII is woefully inadequate at datalogging. Due to the communication overhead involved in the OBDII protocol, only a meager 3 parameters at less […]
This is a collection of turbo maps with curves mapped for whiteblock engines. Engine size is assumed to be 2.3L, although there won’t be much of a difference for 2.4L and 2.5L engines. The lines drawn in the maps below indicate the efficiency area in which the turbo would operate […]