2JZGTE Engine: The factory Supra fuel pump supports around 550bhp (at the crank) when it is operating at peak efficiency. When you want to modify your 2JZGTE to support larger turbo(s), upgrading the fuel pumps is critical. Many people are still using and recommending dual factory Supra fuel pumps. While this is not a bad upgrade, it has some deficiencies in supplying enough fuel pressure at elevated boost levels. In other words, the factory OEM Supra pumps begin to fall off in fuel flow as boost rises. For example, at 25psi of boost on a large turbo, your effective fuel pressure at the fuel rail will have dropped to marginal levels.
At SupraStore.com, we sometimes use dual Walbro 255lph (liter per hour) fuel pumps in our cars. The Walbro pump is the most efficient drop-in replacement pump on the market, and is highly effective at providing sufficient fuel pressure at elevated boost, which is critical for engine longevity. Dual Walbro's with the supporting fuel system upgrades have supported 1000rwhp on Supra's.
When modifying your 7MGTE turbo Supra to higher levels, it is always a good idea to look towards the fuel system as well. A very simple and cost effective way of increasing the fuel flow is by upgrading to a 4th Generation Supra fuel pump. We have selected the Walbro pump for its outstanding flow characteristics even under high fuel pressures. It flows 260 liters/hour and is a serious enhancement for those running 550cc injectors.
The factory fuel pump flows around .45 gallons/minute at 14psi of boost. This is simply not sufficient for those running elevated boost levels or those operating on upgraded CT26 or larger turbos. The Walbro pump flows over 200% more at the lower pressures, and will operate safely into the 70psi of fuel pressure range required for those boosting 20lbs or more.
This is a replacement pump and is used in the factory location (inside the tank).