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 […]
Motronic 4.4, along with most engine management systems, uses 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: […]
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 […]
We now offer a plug-and-play wideband controller: https://vasttuning.com/product/plug-and-play-wideband-controller The Quick Answer Wideband lambda control lets your ECU measure the actual air-fuel ratio across a wide range—not just “lean or rich of stoich.” This enables closed-loop fuel corrections even under boost, making your tune safer and fueling more responsive. What Does […]
The Quick Answer Upgrading your mass airflow sensor’s (MAF) housing isn’t about reducing intake restriction—it allows the ECU to measure more airflow, enabling accurate tuning at higher power levels. How the MAF Sensor Works The MAF sensor uses a heated resistor to measure the mass of air flowing into your […]
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 […]
Iridium, copper, platinum, multi-electrode, single-electrode, plutonium, space dust! The list of spark plug options can be daunting at first glance. Many manufacturers claim their spark plugs will boost performance and increase mileage. Online preachers will swear that their $20 quad-iridium-tip plugs will yield 21.256 extra HP. The truth is, the […]
The custom datalogging routine programmed into a VAST ECU outputs 45 parameters from the ECU at 20-25 samples a second. 26 of these parameters are available for viewing in the Data Dash. This is a view of the ‘Data Dash’ available while datalogging. The Data Dash provides a graphical view of […]
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 […]
