Hey all,
just a quick question, 2006 sti ej257. what are the standard pistons and rods safe powerwise up too?
Regards

 

The pistons have been known to crack ringlands at std power. If you plan to open the engine then its a good opportunity to remove them.
The rods should see you into the low to mid 400 hp area.

The head gaskets can also leak. On mine, the HGs leaked at the same points on all cylinders, suggesting the head bolts loosen up.

 

I think its the luck of the draw mate duncan did about 20 track days, time attack sessions and nurburgring trips on his 06 sti 2.5 running at 380 bhp without any problems, subaru give a 3 year 60,000 mile warranty even on the ppp cars , its the luck of the draw any engine can fail for many reasons.

 

Thanks for replies, im needing pistons anyway so looking at a set of wiesco forged, just wondered if rods were adequate for 350 400 ish. thanks again

 

Why do you need pistons?

 

i got a block from subaru via a work collegue who used to work for subaru. from a 2006 sti press car, which has damage to no2 and no4 pistons, looks like they hit the valve. would prob clean up ok but i want to be safe!

 

Rods are good for around 450 if you dont raise the rev limit and for everything the VF43 can throw through it. (as the pistons should have been with a good map)

 

thats great, its going in my 04 wrx, which standard turbo on it the now, planning to renew turbo, injectors, remap etc just want to make sure bottom ends safe!

 

Theres not much that duncan dont know about the 2.5 mate.

 

perfect, will pm him for a bit of his expert advice!

 

Chocolate Pistons lol rods are good for 400bhp easilly. the pistons can let go on even a standard factory map

 

you will need a few other things on your shopping list depending on your power targets...

- gearbox
- clutch
- tmic (or fmic)
- fuel pump
- exhaust
etc etc