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[Refitting actual combat]Forging intra-abdominal Motec+ sequential gearbox (top) Impreza STI (VAF) mountain climbing style

Although European brands have occupied the domestic performance car market by a large margin in recent years, it does not mean that traditional Japanese brands will be absent. The WRX STI, which is durable and has a small degree of electronics, is deeply loved by competition players. The car model is a racing car specially built for hill climbing. The whole car cost more than 4 million yuan to remodel. What good materials have been changed? Let the author introduce it to you.

Focus on low to medium torque output

2.6Kit forging intra-abdominal transformation

The original engine of the WRX STI still uses the EJ25 red head engine, and the maximum power is maintained at 300hp/41.5kgm. However, since this car is used for domestic mountain climbing competitions, the power part must be fully strengthened. , and the focus of the transformation will be on the torque response at low and medium speeds, rather than the high-horsepower setting, to cope with the frequent acceleration and deceleration characteristics of many corners in mountain climbing. First, replace the piston and connecting rod with FuelForce abdominal forging parts, and at the same time increase the bore and stroke of the middle cylinder to increase the displacement to about 2.6L to obtain better torque performance.

As for the cylinder head, although the high-angle camshaft has not been replaced, CNC grinding has been carried out to equalize the combustion chamber, so that the intake air volume of each cylinder is as much as possible, with the processing of intake and exhaust valve lead angles, and the replacement of titanium alloys. Valve caps, and retain the original variable intake system and other works, so that the basic intake and exhaust efficiency of the engine can be improved. Tuner also abolished the TGV stratified intake valve and the EGR exhaust gas recovery valve. The former is located at the bottom of the intake manifold, which can generate a swirl effect in the combustion chamber to help air and oil and gas mix, but for heavily modified engines, But it is a throat restrictor that hinders the smoothness of the intake, so Tuner also abolished the TGV, and then matched it with a larger-diameter FuelForce inverted intake manifold kit, a forward-inhaling throttle, in the intake line. The configuration is better arranged, which can greatly improve the smoothness of the engine intake.

The transformation direction of this WRX STI is for domestic mountain climbing competitions. Therefore, the power improvement is not a blind pursuit of high horsepower, but the goal of medium-low rotation and high torque output. For this reason, the engine has been replaced with forged parts, and the highest boost value has been changed. Raised to around 1.8bar.
The transformation direction of this WRX STI is for domestic mountain climbing competitions. Therefore, the power improvement is not a blind pursuit of high horsepower, but the goal of medium-low rotation and high torque output. For this reason, the engine has been replaced with forged parts, and the highest boost value has been changed. Raised to around 1.8bar.

In addition, in order to cope with the problem of oil level shaking caused by bad road conditions during mountain climbing races, Tuner not only installed FuelForce to increase the oil pan to increase oil volume, stabilize oil temperature and lubrication effect, but also installed IAG oil conduit+ The oil surface separator can effectively avoid the serious problem that the oil pump cannot absorb the oil.

As for the turbo part, the FuelForce G25-550 turbo kit is selected for reinforcement. This turbo kit includes Garrett G25 turbo, exhaust head section, Down Pipe pipe and Waste Gate mount. It is a fairly mature EJ25 special kit and is worth It is mentioned that the axis of this Garrett G25 turbine is a ball bearing, so it has the advantages of nudge and quick response, which is just in line with the goal set by this car.

In order to ensure that the engine can still absorb oil when the body shakes violently, many racing cars will build additional auxiliary fuel tanks, and the Radium auxiliary fuel tank of this car is designed to be installed in the space of the gasoline pump assembly of the original car, so there is no need for additional welding and fixing. On the body, the integrity is higher.

Others include Invidia mid-tail exhaust pipe, all-aluminum enlarged water tank, titanium alloy intake pipe, ATI crankshaft shock absorption pulley, GFB intake pressure relief valve, Tial exhaust pressure relief valve, ID-1050 fuel injector x4, Radium enlarged fuel rail, Radium integrated auxiliary fuel tank, Fuel Force waste oil recovery barrel x2 and 340L gasoline pump X 2, etc., are all peripheral enhancement kits for the purpose of increasing the power. At present, the maximum power of this car is It is 423hp/40kgm, and the maximum torque is output at about 4200rpm, which can indeed meet the needs of car owners.

The cooling water tank has also been replaced with an all-aluminum enlarged style, with a high-speed fan, which can quickly take away the high temperature generated by the engine, and the configuration of pipes and wires is quite neat and beautiful.
The gearbox feet between the engine and the firewall have been replaced with aluminum alloy parts, and have a pretty good-looking anode coating, which can effectively reduce the shaking during shifting and make the power transmission more direct.
What looks like a gear lever is actually a hydraulic handbrake handle, because the sequential gearbox + steering wheel shift paddles have been replaced, so there is no need to have a gear lever device, so that the driver does not have to worry about it. Pull the wrong lever.

[改裝實戰]Forged intra-abdominal Motec+ sequential gearbox (bottom) Impreza STI (VAF) hill climbing style

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Dreamer is what I am, but unlike many, I struggle to make my dreams come true. I own, seo, admin and site editor. I am a father, married, Christian, Northeastern/Brazil and Libran. I love cars <3

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