A couple simple tuning questions...

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Feb 4, 2009 | 02:27 PM

RickyMartinZ28

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From: Tyler, Tx

A couple simple tuning questions...

First, how do I figure my A/F ratio without a wideband... I know it won't be perfect, but it'll get me somewhere close, and right now thats what I need.

Second, on DCFC, what do I modify, or what values should I modify, to make my throttle response on decel a little more aggressive. It'll rev up quick, but it takes a second to come back down...etc...

Thanks...

-Rick

BTW, I'm using TunerCat

Feb 4, 2009 | 02:42 PM

foff667

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From: Clermont, FL

over 450mv means you are richer than 14.7:1

under 450mv means you are leaner than 14.7:1

Feb 4, 2009 | 03:29 PM

RickyMartinZ28

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From: Tyler, Tx

Is there an equation to figure that? Say it reads 478mv, could I figure what the AF is from that?

Feb 4, 2009 | 04:37 PM

foff667

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From: Clermont, FL

That is pretty much the equation. There is no true relationship mv=afr thats why anyone seriously into tuning has a wideband o2 sensor in their toolbox

Feb 5, 2009 | 08:29 AM

YellowToy/A

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From: Northern WV just south of MD

If you tune get a wide band. If you dont want to tune right get some else who does. Why do u want to decel fast? It will cause ur engine to stall if you do not do other things.

Feb 5, 2009 | 08:51 AM

samh_08

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I know what he means about wanting it to rev down quicker. Coming from a old school carb setup, that quick throttle response both up and down sound great and make it sound like its finely tuned.

Anyone have some tips on how to do that?

Feb 5, 2009 | 10:27 AM

RickyMartinZ28

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From: Tyler, Tx

Well right now it takes what i think is excessively long on decel. Sounds like a bmw coming down....

As long as you blend well, I don't see where stalling would be an issue...

Also at WOT, my MV stay real close to 900mv... Is that normal or does that seem excessively high?

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Feb 5, 2009 | 01:04 PM

Frost

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From: Richmond VA

Getting the revs down is an airflow issue; get rid of the airflow and you get rid of the issue.

As has already been mentioned, what the NBs do at WOT is go high, if you need to know/see/adjust AFR at WOT, you use a wideband.

Feb 5, 2009 | 01:24 PM

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RickyMartinZ28

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From: Tyler, Tx

I'm gonna have to invest in a dang Wideband I suppose... Thats cool.

I've done a ton of research today, I'm learning some good information...

Thanks

-Rick