Yep,that'll do it....bummer Simon...

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No Subarus currently owned

:thumbup:

12:44:38 - That would have rattled hard!

12.6 - 13.7 on 19-20 psi would have been it's death knell.

That cat of yours must have been severely blocked if clearing it shifted your AFR's 3 points leaner than it should have been.

FYI: I run similar heads to yours (same combustion chamber design) - my safe AFR at 22-23 psi is 11.2:1 on Bp98 with 15-16 degrees of timing.

Invest in a wideband O2 dude - Techedge 2J or similar, it will save you $1000's in the future.

Time to build something stronger now!

Check out Welcome - Real Street Performance & don't forget the Perth-WRX discount code

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

I dont understand the logic of having a car tuned, then completely altering a massive part of its breathing system and flogging the crap out of it.

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Huge range of extinguisher brackets for cars!

http://kap.industries/

I always thought fatigue kills a piston, so knocking is the primary reason destroy piston/con rods, right?

Will knocking off a cat cause the afr go off by that much?

U can download "knock detection" for ur torque app, it reads the knocking correction value from ecu.

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport

Wonder if it's the tune or a fuel delivery issue.

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MY00 WRX. 89 Prelude. 99 CRV

Every time I see something like this happen it puts me off having my car tuned.

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[I]and then we discovered it wasn't the Robot King after all, it was the real one. Fortunately I was able to reattach the head.[/I]

I bashed out the cat a couple of weeks after the tune because I noticed that the material inside had come loose and was rattling around a lot. After i did this I called the workshop that tuned my car and asked if i would need a retune due to gutting the cat. I was advised that after removing a cat a retune is generally not required. However they weren't to know that at the time of tune the cat may have been partially blocked. Maybe it was blocked then or maybe it got blocked after, who knows. But perhaps with that information I would have had a different response from them.
Anyway like I said lesson learned.

Accurate in the 13-15:1 range - not so accurate outside of this. it's really only designed to allow the ecu to trim cruise mixtures for peak Cat converter performance.

a Wideband is accurate from 9:1 - free air.

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

thanks mate. i've thought about getting a wideband before but never did. guess that goes onto my shopping list too.