How much HP can a stock EJ257 handle?
400 whp
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.
Is the EJ engine good?
A: The EJ-series motors are good motors, and we would not call them “weak” per se. On a stock motor, the two primary weaknesses are the stock cast hypereutectic pistons and oiling to the rod bearings. The pistons (particularly on the EJ255 and EJ257) will crack if subjected to knock/detonation events.
Is a stock EJ25 reliable?
With all of its imperfections studied and properly sorted out however, the EJ25 can prove to be a reliable engine to enjoy performance driving with. At the end of the day, building a car really is just all a matter of doing your research and finding the right people to build your motor for you.
What year is the EJ257?
The Subaru EJ257 2.5L turbo engine made its debut in the 2004 Impreza WRX STi. It’s still in use in the WRX STI models to this day.
Is EJ257 forged?
Spool EJ257 WRX STI Forged Connecting Rods and CP Forged Pistons. Pistons are available in: Compression Ratios: 8.2:1, 9.0:1 and 10.0:1. Bore Sizes: STD 99.5mm, 99.75mm, 100mm and 100.5mm.
What cars have a EJ257?
In the US, the only car that has an engine designated as an EJ257 is the STI. All of the other 2.5 liter turbo EJ series engines are designated EJ255.
What car has EJ257?
Subaru GD Impreza WRX STi
Subaru’s EJ257 was a turbocharged, 2.5-litre horizontally-opposed (or ‘boxer’) four-cylinder engine. For Australia, the EJ257 engine was introduced in the Subaru GD Impreza WRX STi in 2005 and subsequently powered the GE/GH Impreza WRX STi and V1 WRX.
Does EJ257 have forged internals?
No stock 255 or 257 is forged pistons. Any 255 or 257 should work fine but the same year and model motor that came with the car will be easiest to deal with. There are differences and the ecu tune reflects this.
Are all EJ257 blocks the same?
As for just the shortblock portion of the engine, the pistons are slightly different. Not to say which is better or worse, just a little different. For the work you are planning to do, I would not worry about whether the block came from a EJ255 or EJ257 as the block itself is the same.
What’s the difference between EJ255 and ej257?
The only difference between them was the turbo and intercooler set-up, and the tuning of the ECU. Starting with the 2006 – 2007 WRX and Forester XT, this was the first point where the EJ255 actually started to receive different parts from the STI.
Does ej257 have forged internals?
How much HP can a STI handle?
400-450whp
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 HP can a boxer engine handle?
Some of the most common mods include tunes, intakes, turbos, and exhausts but it leaves people wondering how much power the engine can handle. The consensus is that the stock engine can handle about 300 wheel horsepower before you start having problems with fuel delivery.
How much horsepower does a Subaru EJ257 engine have?
EJ257 engines deliver 300 to 341 horsepower and 290-330 lb-ft. Excellent numbers for a relatively small 2.5L flat four boxer engine. In this guide, we explore the Subaru EJ257 engine and cover problems, reliability, specs, mods, and more.
What is wrong with my EJ257 engine?
If you have a stock EJ257 engine (or EJ255 for that matter), the first stock component that is likely to fail as you turn up the power is the pistons. The common failure point are the ringlands which hold the piston rings in place.
Is the STi EJ257 a reliable engine?
That said, the 2.5L STI flat four engine can provide solid reliability and longevity. It’s not an unreliable engine, but a few of the issues can be pretty serious and costly. We’ll circle back to the EJ257 reliability topic at the end of the article.
What are the specs for the EJ257 flat-four boxer engine?
Specs for the EJ257 flat-four boxer engine are as follows: Engine EJ257 Layout Flat-four (4 cylinder) Displacement 2,457 cc (2.5L) Aspiration Turbo Head/Block Material Aluminum