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JDM GT Four, ST185RC and ST205.
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Celica st205 afr?

Fri Jul 07, 2017 6:17 am

Hello, does anyone have a afr wideband gauge in his st205 with oem ecu?
Im interested in the afr under boost under 4000rpm (2500-4000 with boost) and over 4000rpm.. in 3rd or 4th gear.

My issue is that i have a afe from 13.1/13.5afr under 4000Rpm with full boost and after 4000rpm a 11.1afe and i dont know if that is normal or what the problem can be if not normal.. map sensor is it not because i changed it already..
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Re: Celica st205 afr?

Sat Jul 08, 2017 4:52 pm

No one any idea?

Re: Celica st205 afr?

Sun Jul 09, 2017 2:28 pm

I'll see if I can snap a video today.

Re: Celica st205 afr?

Sun Jul 09, 2017 3:57 pm

That would be great :) thank you

Re: Celica st205 afr?

Sun Jul 09, 2017 9:04 pm

https://www.youtube.com/watch?v=D4uEy92 ... e=youtu.be

I didn't get a lot of chances to push it but I cut it into a few sections that I did. Hope this helps.

Re: Celica st205 afr?

Sun Jul 09, 2017 9:58 pm

doesnt sound abnormal, you can run almost stoich AFR's to a few psi, then you need to run rich to be safe.

rpm isnt a great indicator, boost is the concern if you had 5-10psi and 13:1 i would be a little concerned.

ideal power afrs are around 12-12.5 so 13 isnt that bad. 11 is really rich (typical of Toyota).
14:1 to 16:1 is normal for idle cruise etc when no boost is present

Re: Celica st205 afr?

Mon Jul 10, 2017 6:06 am

Thank you so much. My is the same so its normal.
I was only confused because on my gen2 it was completly different. Tjere o have 12.5afr at the moment where boost cames al the time. But how i see on a gen3 its not the same so i was confused :)
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