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Is this Air:Fuel ratio right??

acarmody

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So got a tune today and the tuners said the Air Flow Meter was dodgy, so they put a new one in because the car was running lean, but looking at the dyno sheet I'm not sure. Any comments.

The red line was before tune, blue is after tune.

 

dirt drifter

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definately not running lean now thats for sure! id say those afr's would be safe even if u had a turbo strapped to it
 

Stressball

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The original reading wasn't far off being stoichiometric. I suppose that could be considered as lean for a road car. Nothing wrong with a bit more 'combustible coolant' though :thumbsup:
 

IBLOWN

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Should have stuck with the first tune. 14.0:1 is fine for N/A thats not running big hp.

But jesus the new tune is running about 11.7:1 at one place on that readout. Thats way too rich for N/A, your just wasting fuel.

As the old saying goes, Lean is mean lol.
 

delcowizzid

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looks not bad to me stock looking fuel curve.i normally tune rich till max torque then lean it out to 13ish to make power
 

acarmody

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So do people think I should take it back and ask them to change that?

If it makes any difference, it has a mild cam and compression around the 10.5:1 mark, always 98 octane.
 

delcowizzid

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got a torque printout ide leave it as is if it was me its making good power if its got a nice wide torque spread shes good as
 

acarmody

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Give me a sec I'll post it up.

But torque curve (from what I can tell) is nice and flat in a large range.
 

acarmody

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I've blacked out the company name because I don't want to seem like I'm bagging any company, not my intent here.

Well I suppose a bit rich is better than a bit lean, especially with raised compression.

 
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