HomemadeTurbo - DIY Turbo Forum - what does stoich mean???

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- - what does stoich mean??? (https://www.homemadeturbo.com/engine-management-10/what-does-stoich-mean-11638/)

Donald125

11-11-2003 08:28 PM

Re:what does stoich mean???

so am i suppose to tune it until it shows kinda Rich?

Dr.Boost

11-11-2003 08:42 PM

Re:what does stoich mean???

You mean on a cheesy Autometer A/F gauge? Yes, tune it so it is on the rich side. Just to be safe I would suggest tuning further into the rich side since you aren't using the most accurate tuning device.
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smokey_civic

11-11-2003 08:47 PM

Re:what does stoich mean???

Cheesy Autometer A/F ration gauge?!?! :o Good thing I haven't bought one of those things. ;) - Matt

TurboEF9

11-11-2003 08:50 PM

Re:what does stoich mean???

Quote:

Originally Posted by nonvtec

I dont think anybody said this but stoich literally stands for stoichiometric which is the air/fuel mixture 14.7/1 which yields the pretty much ideal emissions for cars.

..actually, stoichimetric is not an automotive term. It's a chemistry term, which again, means "a measurement of the amounts all of the things that are in a chemcial reaction". Applied to automotive theory, means a "perfect" air fuel ratio on gasoline, and that is 14.7:1 ratio..

Sorry for the symantics, but it's better to correct misinformation when it surfaces.

Dr.Boost

11-11-2003 08:54 PM

Re:what does stoich mean???

Quote:

Originally Posted by smokey_civic

Cheesy Autometer A/F ration gauge?!?! :o Good thing I haven't bought one of those things. ;) - Matt

Good thing huh! Well, they are cheesy. I knew it when I bought it. They do give a "reference" point to work with. It's better than nothing. :-\ A wideband would be ideal, but money is always an issue. ::)
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smokey_civic

11-11-2003 09:03 PM

Re:what does stoich mean???

Har har har ..... Money is ALWAYS an issue. :( - Matt

nonvtec

11-11-2003 10:33 PM

Re:what does stoich mean???

Quote:

Originally Posted by TurboEF9

Quote:

Originally Posted by nonvtec

I dont think anybody said this but stoich literally stands for stoichiometric which is the air/fuel mixture 14.7/1 which yields the pretty much ideal emissions for cars.

I didn't say it wasnt a car term, I said what it actually was, ask a mechanic, he'll say it is a air/fuel mix that yields the best emissions, what misinformation did I have exactly?

..actually, stoichimetric is not an automotive term. It's a chemistry term, which again, means "a measurement of the amounts all of the things that are in a chemcial reaction". Applied to automotive theory, means a "perfect" air fuel ratio on gasoline, and that is 14.7:1 ratio..

Sorry for the symantics, but it's better to correct misinformation when it surfaces.

88crxSi

11-12-2003 07:39 AM

Re:what does stoich mean???

Quote:

Originally Posted by TurboEF9

14.7:1 is for ambient air pressures (N/A Car), boosted stoich is 11-12:1. :)

Tad	11-17-2003 12:09 AM

Re:what does stoich mean???

iv got a summit racing a/f gauge,
its got 10leds, from bottom to top(bottom lean top rich)
4red/2yellow/4green
what would you guys say would be optimum for idle on an N/A car?

filled up to the 2yellow?
what would you say is the stoich range?
or approximate(i know these things arent that accurate).

TurboEF9

11-17-2003 01:02 AM

Re:what does stoich mean???

Quote:

Originally Posted by crx88Si

14.7:1 is for ambient air pressures (N/A Car), boosted stoich is 11-12:1. :)

That doesn't really make sense. Increasing air pressure does not change it's physical make-up. Which is what would need to happen to reduce it's ability to burn completely during combustion. The ratio of perfect air fuel combustion is still 14.7:1, however, during boost, it is recommended you run richer (~12-13.8:1) to decrease detonation.

..could you please explain your reasoning as to why you believe that pressurized air burns less efficiently than ambient air?

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