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The mkiv Supra Owners Club

Air fuel Ratio


Pig
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Ok guys,

Gunna tell you all about how the car is tommorrow, just wanna know. i have my AEM gauge is coming up with 10 on full boost. Is this ok? i am getting a bit of a funny smell after full boost. Am worried about detanation!

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Yup definitely rich. If you look at page 9 of your manual there's a table, the first line is 10 AFR and is the lowest reading the AEM will give you. says Rich in the table, the concern I'd be having is that that is as low as the gauge reads, so who's to say it's not lower, and therefore VERY RICH. I'd get this checked ASAP if I was you.

 

the gauge reads from 10 to 18.50 AFR (Air to Fuel ratio) therefore 10 AFR is more fuel than 18.5 AFR i.e. richer

10 Rich

18.5 Lean

 

Mike

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Jon, until you get the ecu installed and mapped just make sure you keep it above 10.5 on the afr gauge. If it starts to go off-scale then take your foot off the pedal. That should be enough to help stop carbon fouling.

 

As for bore wash, thats caused by long term overfueling, i.e. new bottom end time

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i agree with CJ. I know you've waited a long time to get it back but rather than thinking 'as soon as I hit 10 lift off' it might be better thinking 'do I even want to get to 10 in the first place?' given that it could be even richer than this!

 

Edit: Not to mention how much you must be spending on petrol atm!

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