My A/F Ratio is 11.5 - 11.6 how do I
04-14-2002, 09:02 AM
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My A/F Ratio is 11.5 - 11.6 how do I lean out the mixture? I already have a lid but do I get a ported MAF? MAF Translator? What A/F should I be running 12.8-13.0? Also what kind of power gains can I reasonably expect when leaning out the A/F ratio to where it should be?
Car is stock 2001 right now except the lid. Thanks guys. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ April 14, 2002, 09:05 AM: Message edited by: Jim Mills ]</small>
Car is stock 2001 right now except the lid. Thanks guys. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<small>[ April 14, 2002, 09:05 AM: Message edited by: Jim Mills ]</small>
04-14-2002, 03:30 PM
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Re: My A/F Ratio is 11.5 - 11.6 how do I </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Jim Mills:
<strong>Thanks Chris... the A/F I've got were numbers off the dyno with wideband on it. I'm curious though as to why the car is running so rich from the factory?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hey Jim! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
All our LS1's run rich from the factory.
With my set-up, I'm running 11.4:1 at WOT <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
To answer one of your earlier questions, a guy with a similar set-up to mine and 11.6:1 tuned his car to 13:1 and got an extra 20 rwhp <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
<strong>Thanks Chris... the A/F I've got were numbers off the dyno with wideband on it. I'm curious though as to why the car is running so rich from the factory?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hey Jim! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
All our LS1's run rich from the factory.
With my set-up, I'm running 11.4:1 at WOT <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
To answer one of your earlier questions, a guy with a similar set-up to mine and 11.6:1 tuned his car to 13:1 and got an extra 20 rwhp <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
04-15-2002, 12:02 AM
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Re: My A/F Ratio is 11.5 - 11.6 how do I If you are obtaining these numbers from the calculated value in autotap I would take them with a grain of salt - and not base any tuning off of them to any great extent.
You can use a MAF-T or LS1 Edit to tune your a/f ratio at WOT. LS1 Edit for your model year is not available yet, but should be soon.
Your target A/F ratio will really be specific to your situation - get it on a dyno with a wideband, the finish off at the track. With a maf-t you will be limited to trying different WOT settings (you should previously ensure are your l-trims are negative using the base setting). I would not go any leaner than 13.2:1 on a dynojet - as this will be probably closer to 13.5:1 or so under full load.
With ls1 edit should for around 12.6-12.8:1 at your peak torque, and lean out gradually to 13:1. Adjust from there as power/torque dicatates.
Chrsi
You can use a MAF-T or LS1 Edit to tune your a/f ratio at WOT. LS1 Edit for your model year is not available yet, but should be soon.
Your target A/F ratio will really be specific to your situation - get it on a dyno with a wideband, the finish off at the track. With a maf-t you will be limited to trying different WOT settings (you should previously ensure are your l-trims are negative using the base setting). I would not go any leaner than 13.2:1 on a dynojet - as this will be probably closer to 13.5:1 or so under full load.
With ls1 edit should for around 12.6-12.8:1 at your peak torque, and lean out gradually to 13:1. Adjust from there as power/torque dicatates.
Chrsi
04-15-2002, 12:19 AM
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Re: My A/F Ratio is 11.5 - 11.6 how do I Thanks Chris... the A/F I've got were numbers off the dyno with wideband on it. I'm curious though as to why the car is running so rich from the factory?