Quote:
Originally Posted by s20525xxx
When I replaced my failed butler down pipe due to collapsed cat, it leaned by 0.3 afr (11.5 to 11.8), got it retuned asap.
I think fatigue is the reason why most old sti has piston failure, any knock would make this procesa lot faster.
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Which wideband O2 set up are you running in your car??
Here's some pics of a 1999-2000 EJ207 factory forged piston - after 270K+ KM :
That motor was pinged, boost spiked to 29psi, belted on skid pans, flogged at Collie & taken to 8500rpm regularly.......Not a single piston 'fatigue' failure.... In fact it would not die!
These motors actually had real forged pistons.
If any model is going to suffer metal fatigue in it's pistons it will be the EJ255/Ej257 hyper crap chocolate pistons......
EJ207's just love 12.4:1 Afr's on boost haha!