Individual throttle body kit for. Vauxhall Vectra Calibra Astra X20XE C20XE. 4 Billet shaftless throttle bodies. Billet shaftless individual throttle body kit.
Includes 4 throttle bodies linkage, fuel rails and 4 trumpets. This kit is ideal for road, track or rally use. Carbon airboxes and trumpets, fly by wire unit, injectors all available separately.
Unit made to order and imported, 3-4 week lead time. Why Individual Throttle Bodies (ITB)? Single throttle bodies are more cost effective to produce hence usually found on most road going engines.Individual throttle bodies can be found on many performance cars and most Naturally aspirated competition cars. The reason is they offer large improvements in throttle response and efficiency due to the reductions in pumping losses from atmospheric pressure being available for each cylinder rather than being forced to take a longer path through the inlet manifold runners. This is achieved by applying an individual butterfly for each cylinder rather than all cylinders sharing a single larger throttle body. The result is a change in engine note and increase in volume whilst improving overall power levels and throttle response. Traditionally the carburettor and throttle body were based around a shaft running through the middle of a butterfly secured with screws. The downside to this is the disruption the shaft and screws cause to the airflow. Older systems got around this by creating slide throttles, this worked well removing the obstruction altogether, making more horsepower with the only downsides were idle and part throttle modulation was poorer and in some competition applications the butterfly produced slightly faster lap times despite less hp. Modern day electronics can make slides more manageable, but theyre still not a fit and forget road going item. Our shaftless butterfly is reduced to 2mm and features a knife edged blade. This is secured at the sides and due to the lack of shaft and screws this achieves 99% flow when compared to no butterfly at all giving the best of both worlds.
This also allows a smaller throttle bore to be selected increasing velocity which results in a higher volumetric efficiency. These are precision machined in the UK from billet aluminium, polished then anodised for a high quality finish. Tuning and electronic fuel injection (EFI). Runner length can be tuned with the trumpets which can alter the torque curve and peak HP.
Each engine is different but generally speaking a high rpm engine will benefit from having shorter runners and a wider torque curve but less peak hp is achieved with longer runners. These systems offer the most improvements when matched with an aftermarket ECU.
This gives finite control over all engine variables offering improvements in accuracy. A lot of older cars are still running carburettors designed by Weber, Dellorto, Pierberg, Holley and others. Fitting a modern ECU allows better accuracy in your fueling and ignition systems. Electronic fuel injection can cater for any load, rpm, or altitude whilst monitoring air fuel mixtures it will always be adjusting parameters on the fly from its closed loop system. EFI systems are not subject to any fuel surge or frothing associated with floats and bowls in the older carb setups whilst also managing the extra g forces competition cars or modern suspension systems can bring to the fuel systems.
With this extra control the engine can run more efficiently and modern advances such as the ability to run an increased compression ratio without the risk of knock. This is becoming a popular option to go with our throttle body kits.
Road cars have given The system has a bad reputation based on poor throttle response in the OEM vehicles, a proper motorsport ECU and modern drive by wire unit a fast and accurate response whilst providing mappable throttle curves, throttle blips on downshift for sequential boxes and control of engine braking. We also appreciate keeping the period correct looks is important for a lot of the classic cars and with this consideration we can cater with a range of throttle bodies which are designed to look very similar to the older Weber of Dellorto carburettors from the older era but with a modern injection system cleverly disguised inside the housing. The item "Vauxhall Vectra Calibra Astra C20XE billet individual throttle body kit ITBs" is in sale since Saturday, April 13, 2019.This item is in the category "Vehicle Parts & Accessories\Car Parts\Air Intake & Fuel Delivery\Throttle Bodies". The seller is "rennsportfactory" and is located in Launceston. This item can be shipped worldwide.