How much HP can a STI block handle?

Skim through the Subaru forums and you’ll find the question on so many STI owners’ minds, “how much horsepower can my EJ257 handle?” The answer is different for everyone, but the general consensus is that the 400-450whp range is when you might want to clear out the garage and get ready to pull a motor.

How much power can a EJ257 block handle?

They will hold up to 400 whp (again as shown in our PPIHC car), but if you want to push up to or beyond that power level, a set of aftermarket H-Beam rods would be recommended.

How much horsepower can a sti make?

When you get behind the wheel of the WRX STI and WRX STI Limited models equipped with the standard 2.5-liter DOHC turbocharged engine, you’ll receive a whopping 310 horsepower.

How long does a stock STI clutch last?

They’re designed to last at least 50,000 miles, but it can vary based on how well you take care of your car and what your driving style is. If you do a lot of city driving, you may find that your clutch wears out faster due to the frequent shifting between lower gears.

Is the EJ255 a good engine?

The engine is still in use in other parts of the world, as of 2020. It’s a strong engine from the factory producing 210-265 horsepower. EJ255 engines are also well known for responding well to tuning and mods. The EJ255 really is a solid overall engine.

How long are clutches supposed to last?

Most clutches are designed to last approximately 60,000 miles before they need to be replaced. Some may need replacing at 30,000 and some others can keep going well over 100,000 miles, but this is fairly uncommon.

How much does it cost to replace a clutch?

The cost to repair a clutch can range between $500 to $2,500. It really depends on the car. Performance cars, exotic cars, and European cars are more expensive to replace the clutch than Japanese economy cars. Four wheel drive vehicles cost more than two wheel drive vehicles.

What kind of car is a 600 hp STI?

We told him we would build him an STI capable of 600 horsepower to the wheels, and have room to grow. We then set the plans in motion to make this beauty happen. The car we built is a 2013 Impreza WRX STI sedan. It had already been to us for a stage 2+ parts install and flex-fuel tune previously, so the car did have some parts on it already.

What kind of pistons does a STI block have?

We opted for a closed deck EJ257 STI block, that was bored and honed for 99.75mm JE pistons. The block was drilled for 1/2″ head studs, which will allow for more clamping force to keep all that boost contained and the heads where they need to be – attached to the block.

Is there a 600 horsepower Impreza WRX STI?

He came to us and said his goal was to have a 600 horsepower STI. We told him we would build him an STI capable of 600 horsepower to the wheels, and have room to grow. We then set the plans in motion to make this beauty happen. The car we built is a 2013 Impreza WRX STI sedan.

How big of a turbo do you need for a STI?

Just consider everything, because you will have to spend a lot of money to go further. The stock turbo maxes out around 350awhp, and is losing top-end boost well before that. If you want a strong 330awhp or more from an STi, you need a bigger turbo.