Re: Fuel Stoich Rating & Tuning --> Is this info correct?
[Re: BradH]
#2534350
08/10/18 07:47 PM
08/10/18 07:47 PM
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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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If you know the a/f ratio for stoich for the fuel you are using, you can program your wideband lambda value to reflect that ratio. For that matter, if you consistently use the same fuel, and you find that the engine likes a 13.1 ratio under power, you could set your wideband lambda so that 13.1 : 1 ratio is a perfect “1” lambda. It wont really be “lambda”, but it gives an easy to zero in on target.
"use it 'till it breaks, replace as needed"
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Re: Fuel Stoich Rating & Tuning --> Is this info correct?
[Re: BradH]
#2534357
08/10/18 08:01 PM
08/10/18 08:01 PM
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Joined: Jan 2003
Posts: 8,160 Plymouth, MI
Blusmbl
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master
Joined: Jan 2003
Posts: 8,160
Plymouth, MI
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Yep, E10's stoich is 14.1:1. It's why most modern vehicles that operate on a range of fuels gets calibrated to lambda instead of AFR. It's easier to just target 0.85 lambda, as an example, and then it is safe regardless of the fuel being used.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: Fuel Stoich Rating & Tuning --> Is this info correct?
[Re: BradH]
#2535767
08/13/18 06:33 PM
08/13/18 06:33 PM
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Joined: Feb 2010
Posts: 1,645 Phila. Pa.
Mattax
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top fuel
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Posts: 1,645
Phila. Pa.
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Brad, The Innovate loggers will show Lamda. This is the easiest, most straightforward to do the testing you want. I know, I know, I haven't switched over myself (yet), but I'm also not looking for the level of difference of you are. Do your tests looking at lamda, convert it later if you want for curiosity. As BBM stated, Lamda is what the wideband interprets as stoich regardless of the fuel. As to which fuel, what do you think the engine needs? Match the fuel to the compression. Sunoco Race fuel must have a rep to help with this. Remember this post where Shrinker changed fuels twice as the compression came up during dyno runs? http://motorsportsvillage.com/forum/viewtopic.php?f=6&t=9920I'd avoid pump fuel for your testing. Too many different flavors depending on where and when its bought, never mind batch variations. I'd also either commit to an oxygenated fuel or not. Think about maybe running a Ethanol blend since that's what's in most pump gas (unless you go upstate) and you plan to mix for street driving. yes? Then put a few gallons of non-eth race fuel in the tank for winter storage.
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Re: Fuel Stoich Rating & Tuning --> Is this info correct?
[Re: BradH]
#2535801
08/13/18 07:33 PM
08/13/18 07:33 PM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
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Pattison Texas
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This has a nice fuel chart near the bottom.AFR & Lambda for different fuels CLICK HERE
Last edited by csk; 08/13/18 07:38 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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