Can Someone Help with This Screen

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Dec 2, 2005 | 12:00 AM

GRX

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Le Mans Master

Joined: Jul 2001

Posts: 6,252

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From: Silicon Valley Kalifornia

Can Someone Help with This Screen

Cars is an '85 - This screen capture is from Tunercats $1F file. Can anyone explain what this screen is for? Bin is from a Carroll Supercharging chip. Does it refer to "Air/Fuel Ratio" as in 'reading the O2'??? TIA

Last edited by GRX; Dec 2, 2005 at 12:12 AM.

Dec 2, 2005 | 12:24 AM

Alvin

Drifting

Joined: May 2003

Posts: 1,730

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From: Charlotte NC

St. Jude Donor '05

wow thats goofy.

Thats your PE table. Its basically an enricher for wide open throttle. The formula to see "target" afr is

14.7/(1+ %cool + %RPM)= AFR

However its never that clean cut. After you tune a car you'll notice the graph or curve will not make much logical since at all.

Higher numbers = more fuel.

Dec 2, 2005 | 12:28 AM

GRX

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Le Mans Master

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From: Silicon Valley Kalifornia

This is from a Carroll Supecharger bin file for 12psi of boost. The stock GM graph stays at 0% throughout.

Dec 2, 2005 | 03:49 PM

GRX

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Le Mans Master

Joined: Jul 2001

Posts: 6,252

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From: Silicon Valley Kalifornia

Hypertech, dips down to -3.1 from 0 at 5200 rpm. Why would that be?

Last edited by GRX; Dec 2, 2005 at 03:52 PM.

Dec 5, 2005 | 11:10 AM

GRX

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Le Mans Master

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From: Silicon Valley Kalifornia

Ok, last question: (don't everybody jump in at once and answer this one!)
Question: "Change to Air/Fuel" means 'change to O2' reading or 'change to AFR map' ??? TIA

Dec 6, 2005 | 05:42 PM

rons85

Burning Brakes

Joined: Apr 2004

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From: Huntington ma

I take the %change to fuel/air ratio vs. (xx) tables to mean that the ecm will change the Desired/Target fuel air ratio by that % under those conditions. This looks to me like the Only way you can actually change what the Target F/A ratio is in this ECM. You can play with Pulse width, and timing, and etc - but the BLM is still going to work to bring the measured F/A ratio back to the Target.

BTW - the stock GM chip does the same as the Hypertech - carries 0% till 5200 rpm (It's an L-98 for god sake - it's fell on it's face by that high!) then drops the target 3.1% from there up. That's in the "vs. RPM" table.

Am I right, or out in left field someplace...

Dec 7, 2005 | 10:13 AM

GRX

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Le Mans Master

Joined: Jul 2001

Posts: 6,252

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From: Silicon Valley Kalifornia

Thats interesting. My hypertech chip is different than yours. Mine actually dips down to "-3.1". Like a rev-limiter...Weird. The GM bin I just got from the dealer stays at 0 to 6400 rpm. ...1985 vette owners are really a minority here in scan-tune.