Afr for e85

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Feb 8, 2016 | 08:52 AM

lmt0705

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From: buffalo NY

Afr for e85

What am I looking for as far as afr using e85 for a safe tune? What's the e85 equivalent to like 11.5/1?

Feb 8, 2016 | 09:02 AM

oscs

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From: Cypress, TX

11.5 is what I use

Feb 8, 2016 | 09:10 AM

lmt0705

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So I just change the stoich value to 9.765 and leave everything else alone? My wideband won't read 7 something?

Feb 8, 2016 | 09:23 AM

oscs

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I use the holley system and just keep my AFR on the gas scale.

Feb 8, 2016 | 10:18 AM

RonSSNova

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Correct. If GM PCM, stoich to 9.77 and just read your WB on the gas scale.
Or Lambda if you are comfortable with that.

Feb 10, 2016 | 09:19 AM

FourG63 97GST

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I use the same targets as gasoline on gasonline scale, 11.5ish on F/I, 13.0 N/A

Feb 10, 2016 | 09:34 AM

mshadow

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From: Buffalo NY

You don't have to change anything...you can still target 11.5 on a wideband setup for gas when running e85.

Lambda 0.780
e85 7.613
gas 11.466

Are all the same thing

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Feb 10, 2016 | 06:36 PM

eaglegoat

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From: SV, AZ

Don't take this the wrong way, but if you don't know this and you're doing the tuning you should stop. Go read more on the hptuners forum and in the timing section. Or go pay someone so you don't hurt your engine/self/someone.

Feb 11, 2016 | 07:47 AM

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lmt0705

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Everything looks good so far by reading the spark plugs, what would happen if I changed the stoich value in the pcm?

Feb 11, 2016 | 08:27 PM

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2JZFC

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Would like to hear from some others along with a little detail on setup, HP and/or time slip.

Feb 11, 2016 | 10:04 PM

#12

lmt0705

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From: buffalo NY

thompson lsx short block, trick flow heads, precision 6766s, 4l80, fab 9 made 1028 on the gates so far

Feb 12, 2016 | 08:52 AM

#13

95bowtie

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Quote:

Originally Posted by lmt0705

Everything looks good so far by reading the spark plugs, what would happen if I changed the stoich value in the pcm?

So it is still set to 14.68 I take it?

If you aren't using and dont plan on using the o2's then I don't think it matters if you change the stoich or not. Your boost enrich and power enrich table still gets set to the same value no matter what the stoich is set at.

Feb 12, 2016 | 10:11 AM

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lmt0705

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From: buffalo NY

We wound up turning them off, they kept trying to correct like 30%. They were going crazy for some reason and made idle and part throttle tuning damn near impossible

Feb 12, 2016 | 07:57 PM

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willizm

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From: Joliet,IL and Las Vegas 50/50

I target .75-.80 lambda WOT

Feb 12, 2016 | 08:53 PM

#16

lmt0705

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I'd like to keep it afr I think, lambda is like reading Spanish for me. Targeting high 10s low 11s at this point

Feb 12, 2016 | 10:27 PM

#17

2JZFC

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Quote:

Originally Posted by lmt0705

............lambda is like reading Spanish for me.

If someone states lambda, just multiply it by 14.7 to get what you want. So, .75 to .80 lambda is 11.025 to 11.76. Would be nice to also know the combo and power level/ET.