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Old 02-29-2012, 06:17 PM   #1
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Default Check my Tables Please

Hey guys im getting ready to start autotunning and want to double check my afr target table. curly sent me a picture of his table and i copyed it, so i figure it will get it close.
Thanks
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Old 02-29-2012, 09:18 PM   #2
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I would recommend just under stoich at idle - about 14-14.5 works for a more stable idle. 15.5 at 5000rpm is a bit high. Also 15.5 at 70kPa is a bit high. Consider dropping both a bit. Also want to be closer to 13:1 at 100kPa for optimum performance and to keep you from blowing the motor. Numbers in the high kPa look decent.
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Old 02-29-2012, 09:42 PM   #3
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My setups for my street car.

Speed Density



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MAF
Still fine tuning this one



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Old 02-29-2012, 10:24 PM   #4
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The following is copied from a post I made here: https://www.miataturbo.net/mspnp-55/afr-rpms-fluctuate-62513/

"Your AFR target table should be based upon a knowledge of theoretical engine operating conditions and gasoline chemistry. A few relevant AFR's:
1. Stoichiometric is when gasoline and air combust and theoretically produce nothing by water and carbon dioxide byproducts (i.e., no extra oxygen or unburned fuel present and minimum carbon monoxide). This ratio is 14.7:1 (Air:Fuel). NBO2 sensors are designed to switch at this AFR.
2. Maximum torque happens when your mixture burns the most quickly. ~12.5:1 is the target for this.
3. Richening the mixture past 12.5:1 has the effect of slowing combustion. This helps resist detonation.
4. On the lean side, you can go leaner than 14.7:1 and get some economy benefits in parts of the AFR table where it makes sense to do so.
5. In the idle region, going a bit richer than 14.7:1 usually results in best idle quality. You should have seen that during your idle tuning.

So, based upon the above, this is what I'm doing in my AFR table:


Note that I'm running water injection. If you're not, I recommend you richen the boost region by at least half a point (i.e., the 200kPa row would be 11.5:1)."
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Old 02-29-2012, 10:30 PM   #5
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Quote:
Originally Posted by sccaax View Post
I would recommend just under stoich at idle - about 14-14.5 works for a more stable idle. 15.5 at 5000rpm is a bit high. Also 15.5 at 70kPa is a bit high. Consider dropping both a bit. Also want to be closer to 13:1 at 100kPa for optimum performance and to keep you from blowing the motor. Numbers in the high kPa look decent.
yea, he remembered that was his emissions settings lol. i changed idle to 14.5 per the brain.
And i will change the 100 kpa to, 13. what should the 15.5's you mentioned drop down to.
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Old 02-29-2012, 10:33 PM   #6
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Am I the only one that thinks 12.5 is too high for boost? Hustler and Savington saw no gains beyond 11.5, given that wouldnt 11.5 be better as you would have a higher saftey margin and same power?
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Old 02-29-2012, 11:38 PM   #7
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I think it really depends on the load the motor has on it, I'm not gonna start pulling fuel so easily just because I'm near 100kpa at low rpms
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Old 03-01-2012, 12:07 AM   #8
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oh on a side note how do you change the idle rpm, its sitting at 1300-1500.
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Old 03-01-2012, 12:59 AM   #9
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I would make the following modifications:
100kpa row/7000:12
100kpa row/6000:12.5
100kpa row/5000: 12.7
100kpa row/4000:13
100kpa row/3000:13
100kpa row/2000:13.5
100kpa row/1000:13.5

Interpolate along Y Axis to your 200kpa targets. They are fine.
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Old 03-01-2012, 01:01 AM   #10
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Quote:
Originally Posted by AnnorexicRoadster View Post
Am I the only one that thinks 12.5 is too high for boost? Hustler and Savington saw no gains beyond 11.5, given that wouldnt 11.5 be better as you would have a higher saftey margin and same power?
It's not too high but I would do what I recommended which is run fatter at 100kpa and blend upwards. That will make things nice and smooth.
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Old 03-01-2012, 01:58 AM   #11
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Here's my "real" target table.

I certainly prioritized track reliability over streetability, since it's not a street car. I appreciate the sentiment by stealing my table, but there's probably better ones out there.
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Old 03-01-2012, 08:58 AM   #12
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My bauce table:
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Old 03-01-2012, 09:16 AM   #13
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God has spoken. Bow down and burn his table. Not literally.

Last edited by curly; 03-01-2012 at 09:37 AM.
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Old 03-01-2012, 09:30 AM   #14
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I keep it simple....

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Old 03-01-2012, 09:43 AM   #15
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it migh tbe simple, but I'm sure you don't get the mpgs I do. My timing is fairly advanced in cruise, so I dont need the fuel.
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Old 03-01-2012, 09:45 AM   #16
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I got 30-31mpg on a long *** 10 hour trip to pick up my hardtop... mainly 2 lane roads, 55mph, going thru some towns here and there. lots of 3rd, 4th gear pulls and some messing around with MS to keep me sane/awake. good enough for me!
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Old 03-01-2012, 10:24 AM   #17
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hmm 14.7 at 4000-5000+ don't want
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Old 03-01-2012, 10:43 AM   #18
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when will you be there with a turbo if you're not cruising on the highway in 4th gear?
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Old 03-01-2012, 10:43 AM   #19
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Quote:
Originally Posted by hustler View Post
My bauce table:
Pretty much exactly what I was saying snuggles
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Old 03-01-2012, 11:20 AM   #20
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do not follow the 12.X at 160 kPa at low RPM.

I know you can't boost like that, but I wouldn't put that in the table.
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