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Oct 10, 2006 | 09:54 AM

ty_ty13

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From: paducah, ky

quick easy questions

in the VE table when you put larger values in, are you putting more air in the motor or are you putting more fuel in the motor?

what AFR do you guys consider Lean and Fat?

what is considered safe?

Thanks,

Tyler

Oct 10, 2006 | 10:09 AM

foff667

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From: Clermont, FL

Quote:

in the VE table when you put larger values in, are you putting more air in the motor or are you putting more fuel in the motor?

neither in reality...all your doing is TELLING the pcm where in the powerband your vehicle is more or less efficient...the more efficient the more fuel it will add so in the end you ARE adding more fuel but different then the way your thinking about it.

Quote:

what AFR do you guys consider Lean and Fat?

its all relative...some consider 12.2 fat on an NA car yet others see it as just about perfect...some consider 13.6:1 lean on an NA car yet others see it as just about perfect. Also depends if your talking about #'s on a dyno or numbers on the street.

Quote:

what is considered safe?

I'll quote myself from another thread "the term "safe" is all relative when you use it when talking about tuning. Is 30* of timing safe? Is removing TM safe? its all relative."

Oct 10, 2006 | 11:39 AM

ty_ty13

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From: paducah, ky

so larger values in the VE are adding more fuel?

Oct 10, 2006 | 11:44 AM

foff667

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From: Clermont, FL

-yes.

Oct 10, 2006 | 11:53 AM

ty_ty13

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From: paducah, ky

i have a blown car and tune on the street what would you consider a decent AFR? no more theoretical answers either

Oct 10, 2006 | 12:09 PM

slow

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From: Orlando

doesn't the VE table have a mass value of airflow?

For a blown vehicle, you want to be around 12.0 or richer.

Ryan

Oct 10, 2006 | 12:37 PM

SSpdDmon

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From: Commerce Twp, MI

The default units for the VE table are (grams*Kelvin/kPa), which to me sounds like airflow. More airflow requires more fuel. Therefore I'd say when you increase the VE table, you're telling the PCM, "This is the amount of airflow the motor will see based on the current temperature and barometric pressure."

Generally for a blown tune, I believe people shoot for an AFR of 11.8:1 for the street.

How much boost are you running?

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Oct 10, 2006 | 01:41 PM

RedHardSupra

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From: Laurel, MD

SSpdDmon got it right--you dont 'add fuel.' it is not your job. all you have to do, is to describe the breathing characteristics (airflow at temp/pressure/rpm) and the fueling is figured out for you, by the computer.