1nzfe stock sleeves max power

[PARIS]

But i think you had dynoed it at 16 psi 250 bhp parmas?

[Parmas]

Originally Posted by PARIS

But i think you had dynoed it at 16 psi 250 bhp parmas?

That was a long time ago with the previous management but that was only on the dyno. We decided to go 9psi until we solved the tuning issues. The problem was infact the ecu that do not match with the yaris engine and now I changed to Haltech management.

Due to new management I had to re-tune the engine and till now I am still 9psi. I never run a daily 16psi so I don't know if it will hold eventually for long time but I am thinking of uppping the boost slowly keeping an eye on the temp, pressure and AFR gauges.

[PARIS]

Aren't honda engines from exactly the same material as ours? both are all aluminum and open deck i think?

[xbgod]

The blocks are aluminum castings then machined.

cylinder block: aluminum with cast-in iron liners.
cylinder and crankshaft centers are offset to reduce piston slapping.

The combustion chambers in the scion engine employ a tapered (oblique) squish design, to improve thermal efficiency and reduce the chance of engine knock (pre-ignition). the squish area has been shaped obliquely along the wall surface of the combustion chamber, improving airflow, promoting swirl and speeding flame travel.
the combustion chambers are almost entirely machined, to ensure minimum variation in combustion chamber volume across the four cylinders. special attention has been paid to cooling the combustion chamber, including provision of a water jacket between the exhaust port and the spark plug boss, to lower the operating temperature at the exhaust valve seat and improve cooling performance.

XBG

[Paris vvt-i]

I think that blown_xa also was in stock sleeves pushing 247whp. Perhaps you could ask him!