at what rpm / kpa do you richen up the mixture? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-24-2007, 10:30 PM   #1
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Default at what rpm / kpa do you richen up the mixture?

DIY's guide says to switch over from 14.7:1 to 12.0:1 at 100kpa / 14psi. That's a little late if you ask me.
http://www.convertit.com/Go/ConvertI.../Converter.ASP


Also, where should I richen from 14.7:1 to say 13:1 when running the car NA?


I keep getting different afr ratios from different people. What does everyone here recommend for both NA and FI. One guy I know who tracks an STI in GT2 says to run at 12.5:1 safely at the track, my buddy at the porsche shop says 12.0, and Gary at TDR says 11.5-11.8:1. All anyone ever says for NA is "lean is mean." lol

Thanks for the help.
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Old 05-24-2007, 10:55 PM   #2
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Where do you see that? That would be late....

But keep in mind 100kpa is atmospheric pressure, not 14.5psi. 14.5psi is about 200kpa....
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Old 05-24-2007, 10:57 PM   #3
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Quote:
Originally Posted by FoundSoul View Post
Where do you see that? That would be late....

But keep in mind 100kpa is atmospheric pressure, not 14.5psi. 14.5psi is about 200kpa....
oh ****. Thanks for the clarification. So 200kpa is 14.5psi.

http://www.diyautotune.com/tech_arti...squirt_ems.htm

that makes more sense now, considering I have my head out of my ***, and any boost gets a richer mixture.

Thanks.
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Old 05-24-2007, 11:03 PM   #4
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the MAP values you see are absolute pressure. so remember that atmo is roughly 100kpa on flat land. So anything you deal with in megatune less than 100 kpa is your car in vac, and anything over 100 kpa your car is in boost. the most manifold pressure your car in NA trim can muster is exactly equal to atmospheric.
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Old 05-25-2007, 10:18 AM   #5
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Old 05-25-2007, 10:58 AM   #6
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my targets look like this:



dunno if they are ideal, i wasn't even really using them, but it gives you an idea of what I was shooting for.
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Old 05-25-2007, 11:46 AM   #7
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it's been said before, BUT make sure you're WBO2 is calibrated.
Here's a cheat sheet
Attached Thumbnails
at what rpm / kpa do you richen up the mixture?-kpapsi.gif  
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Old 05-25-2007, 12:10 PM   #8
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Quote:
Originally Posted by Braineack View Post
my targets look like this:



dunno if they are ideal, i wasn't even really using them, but it gives you an idea of what I was shooting for.
Is that for EGO tuning? I'm not familiar with that window.
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Old 05-25-2007, 12:12 PM   #9
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yeah, it's AFR targets for the EGO correction under "more settings"

even if you dont ever use EGO, it give you an idea of what I'm shooting for based on RPM/kPa (basically the VE table will be the opposite colors as this)
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Old 05-25-2007, 12:16 PM   #10
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I'd say you can even go a little leaner up top than Brain has it by maybe around .3-.5 AFR
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