Ok, so I have been searching high and low on the net to find the stats of the WRC STI Solberg drives and how they get those strange numbers. Like 300 hp and 400+ tq, I couldnt even find pictures of the engine! does anyone know the setup of the car, as well as suspension. please include links and pictures.
I know they used the jdm ej20 engine. Not sure on the supporting mods though. Go to the Subaru rally website, they usually have a build on the race car.
They use restrictors to get the slightly odd numbers. so they have copious amounts of torque, but limited in hp
Engine: H-4. Flat four-cylinder, 16 valve, turbocharged Capacity: 1994cc Bore: 92.0mm Stroke: 75.0mm Engine management: Subaru programmable electronic engine management system Power: 300bhp @ 5500rpm Torque: 650Nm @ 3000rpm Transmission: Six-speed electro-hydraulic Electro-hydraulically controlled center differential, Mechanical front and rear differentials Drive system: Subaru Symmetrical All Wheel Drive Suspension: Front: MacPherson strut, Rear: MacPherson strut Shock absorbers: Bos, fully adjustable Brakes: AP Racing 310mm ventilated discs and six-pot calipers front and rear. For asphalt use, front brakes are 378mm ventilated discs with six-pot calipers Exhaust system: Inconnel with Subaru anti-lag system. Fitted with catalytic converters Steering: Power assisted rack and pinion Dimensions: Overall length: 4415mm Overall width: 1800mm Overall height: 1475mm Wheelbase: 2635mm Car weight: 1230kgs (WRC regulation min.) Data systems: Single integrated electronic system controlling engine, transmission and data-logging In-car display: LCD color monitor with eight selectable data screens Tires: Pirelli (championship control tire) Radio equipment: Kenwood Turbo charger: IHI - with WRC-regulation 34mm restrictor and Subaru anti-lag system Spark plugs: DENSO Wheels: BBS: 15” diameter for gravel, 18” for tarmac Fuel tank capacity: 80 liters Design: Computational Fluid Dynamics (CFD) for entire car That is about as detailed you can find on the WRC setup.
How in the hell did they get all that torque with a 2.0, and why did they decided to do a 2.0 not a 2.5
It is FIA regualtion that all cars in that class run a 2.0 liter motor or smaller. Hence the Evo's only having a 2.0, Ford, etc...
I wonder how much it would cost to get a decent setup similar to have some fun rallying. Ever since I went off roading with my car, I wanna do it some more, but I do see a small issue, you need to make the suspension and frame stronger.
I would imagine it would cost quite a bit to reproduce the WRC car setup. I remember reading somewhere (probably Nasioc) about the anti-lag system and how it will seriously decrease the life span of the engine. I have a feeling that the engines in the WRC cars are rebuilt or replaced quite frequently.
If I remember correctly, the Subaru WRC Cars are about $800,000 each. I had the same curiosity the other day, and decided to do some research. A decent DMS 50mm Adjustable Struts/Springs runs about $10,000 based on a price I got on ScoobyTuner.com. Add in all the other needed parts, strengthened End Links, Sway Bars, and I would recommend every single Brace available under the car, and you are looking at a pretty hefty investment. After doing all that, you would also want to cover the underside of your car with every available skid plate to cover as much of the under chassis as possible. Each WRC car is completely stripped after each rally event. They are rebuilt between each event from top to bottom. Parts like the Suspension are usually broken down and refurbished. The entire engine is stripped and rebuilt with all new internals. The turbo and intercooler are replaced, and the car is retuned to maximize the setup for the next rally stage.
I love the sound of the anti-lag systems. It does destroy your motor but can you imagine having all that instant boost.
Seems like the 2.5 would be fun too with the instantaneous torque for those that don't have $800k. Imagine a twin scroll on one of those!
Its quite amazing how small the turbo inlet is on the wrc car. 34mm isn't much larger than a quarter or so, am I right? Also they usually only rev to about 5200rpm or so I think. The boost falls off quickly due to the restrictor and the fact that the turbo is relatively small. Its almost all low end grunt, so revving to the sky is pointless wear on the engine. Still, 300hp from that setup? I'd love to see it being tuned. That would be badass. Also I love how its absolutely impossible to get the particular model number on the turbo that they use. It always just "IHI with 34mm restrictor." I'd love to know which IHI, or if its even a commercially available turbo.
The turbos that the rally cars run are all custom pieces. They have magnesium or titanium compressor wheels and inconel exhaust wheels to keep the weight down. They run a ton of boost on a small turbo. It is similar to a stock evo or sti turbo but they flow better out towards redline due to larger exhaust side wheels and housings. You get a very large torque spike at a pretty low rpm, then it falls to redline.
WRC run's turbo's that are equivalent in size to a GT30r, and if allowed to run unrestricted they would make well over 450whp and 500tq. It's the inlet restrictor that limits the airflow, thus choking off the turbo in higher rpms. Those cars will run 30+ psi down low but then only see around 8-10psi up top. Because they are required to run the restrictor is also why subaru has come up with that larger than life intercooler piping. This piping was designed to act as a reservoir to increase the amount of stored compressed air prior to the throttle body. Think of it as allowing short bursts of power without being limited to the constraints of airflow through the restrictor when the throttle is first opened. Subaru WRC Turbo Same turbo without all the lines and a different inlet restrictor
30r is a small turbo. The torque spike is similar to what you get on a stock sti or stock evo turbo. That is what I was pointing out. That is how they get so much torque. In 2008 the subaru team ran 60 psi of boost pressure. I am not sure what kind of boost they were running up top, it really doesnt matter up top since they are keeping the horsepower under 300. You obviously are going to get a torque spike from that.