AIR/FUEL Ratio number???

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Dec 11, 2004 | 08:49 PM

95_Firehawk_Dude

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From: Tinley Park

AIR/FUEL Ratio number???

What is "normal" air/fuel ratio number? I.E. When you get your car dyno'd, below the HP/TQ numbers there is a graph of the air fuel ratio with the RPM your at? What is that supposed to be so to speak? Higher number on the left mean rich or lean?

Thanks

Dec 11, 2004 | 10:04 PM

wait4me

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From: warsaw, in

you want about a 12.8 straight accross normally for naturally asperated cars, anthing lower may hurt performance, and a higher number means you are running lean, and too lean is bad.. jes

Dec 12, 2004 | 01:13 AM

95_Firehawk_Dude

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From: Tinley Park

Quote:

Originally Posted by wait4me

you want about a 12.8 straight accross normally for naturally asperated cars, anthing lower may hurt performance, and a higher number means you are running lean, and too lean is bad.. jes

Would to lean mean that more power could be pulled out of it or is that when your running to rich? I.E. when they tune your car... how are they getting more power out of it?

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Dec 12, 2004 | 02:18 AM

chpmnsws6

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From: Springfield IL

13.1 N/A makes the most power and is not lean at all.

Dec 12, 2004 | 02:32 AM

BlackCamaroSS02

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From: Smyrna, DE

What would be a good ratio for Boosted cars...mine was 11.6 A/F i think.

Dec 12, 2004 | 04:26 AM

95_Firehawk_Dude

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From: Tinley Park

Quote:

Originally Posted by ramairstyle00

13.1 N/A makes the most power and is not lean at all.

So what would you make of this? A/F part of dyno run.

If you can't tell from the pic, its kinda goes like this:

18 from 2000 to 2300 rpm
16 @ 2400 rpm
15 @ 2600 rpm
14 @ 2800 rpm
13 @ 3000 rpm and stays until 4500 rpm
12 @ 4500 rpm and stays until 5500 rpm
11 @ 5500 rpm

Is the car running to lean? Rich? What else can you make from it?

Thanks.