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SVTPerformance's Chain of Restaurants
Tuning À la carte
MAF trasfer table and AFR
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<blockquote data-quote="ZeroSVT" data-source="post: 14505744" data-attributes="member: 81012"><p>I have read you book actually <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>(See EDIT below)Could you give me an example of a Wideband that is specifically calibrated for 14.7? Every aftermarket wideband we have tinkered with is calibrated for range +/- 2.5(ish)%</p><p></p><p>I don't agree that you can figure that 14.7 is 1.0 on a non adjustable wideband. Does this wideband show lambda? (Maybe its just a cheap wideband thing?) <strong>EDIT: </strong>Apparently there are meters out there that only show AFR (stupid). So you can correct this though, its called Meter correction factor. </p><p></p><p>Meter Correction = 14.7 x Target λ Value</p><p></p><p>I do agree cross referencing the STFT after you build out your MAF is not a bad idea <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>It's debatable what the official number is internally, we all have our opinion. However, there is some Math that comes into play here to get politically correct. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue :p" loading="lazy" data-shortname=":p" /></p><p></p><p>For example providing that you are after Blend AFR at E10. </p><p>Blend AFR (x) = (0.10 x E85 A/F Ratio) + (0.90 X Petrol A/F Ratio)</p><p>x = (0.10 x 9.765) + (0.90 x 14.7)</p><p>x = 14.20 to be politically correct by math </p><p></p><p>or if tuning for a AFR other than stoich</p><p></p><p>λ = (Desired A/F ratio) ÷ (Stoichiometric A/F Ratio)</p><p></p><p>Then goes the fancy chemical engineers with the Residual exhaust oxygen and hydrocarbons and A/F measured different places, temperatures, vs petrol makeup blah blah blah... Ugh, I need to change jobs, anyone need a good Janitor?</p><p></p><p>Cheers,</p><p>-Matt</p></blockquote><p></p>
[QUOTE="ZeroSVT, post: 14505744, member: 81012"] I have read you book actually :) (See EDIT below)Could you give me an example of a Wideband that is specifically calibrated for 14.7? Every aftermarket wideband we have tinkered with is calibrated for range +/- 2.5(ish)% I don't agree that you can figure that 14.7 is 1.0 on a non adjustable wideband. Does this wideband show lambda? (Maybe its just a cheap wideband thing?) [B]EDIT: [/B]Apparently there are meters out there that only show AFR (stupid). So you can correct this though, its called Meter correction factor. Meter Correction = 14.7 x Target λ Value I do agree cross referencing the STFT after you build out your MAF is not a bad idea :) It's debatable what the official number is internally, we all have our opinion. However, there is some Math that comes into play here to get politically correct. :p For example providing that you are after Blend AFR at E10. Blend AFR (x) = (0.10 x E85 A/F Ratio) + (0.90 X Petrol A/F Ratio) x = (0.10 x 9.765) + (0.90 x 14.7) x = 14.20 to be politically correct by math or if tuning for a AFR other than stoich λ = (Desired A/F ratio) ÷ (Stoichiometric A/F Ratio) Then goes the fancy chemical engineers with the Residual exhaust oxygen and hydrocarbons and A/F measured different places, temperatures, vs petrol makeup blah blah blah... Ugh, I need to change jobs, anyone need a good Janitor? Cheers, -Matt [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
MAF trasfer table and AFR
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