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Author Topic: Target lambda at WOT  (Read 9584 times)
SB_GLI
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« on: September 11, 2014, 05:50:47 PM »

I'd like to discuss fueling, and in specific, target lambda at WOT.

I've seen just about everywhere on this forum, and in other log files from VWs and Audis, it seems a lot of people tune for around 12.5AFR.  I've read everywhere, spoke with real life pro tuners (non ME7 tuners), and have positive experience with tuning for a richer AFR than that.  I typically shoot for a 11.8-11.4 AFR as this cools the egts, allows further timing advance, and makes more power safely than a leaner AFR.

Please discuss.
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ddillenger
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« Reply #1 on: September 11, 2014, 06:57:42 PM »

91 octane=11.5
93 octane=a bit leaner
Meth=12.5
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kingkhalilz
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« Reply #2 on: September 11, 2014, 07:01:59 PM »

Wow, that rich?? I thought leaning it out made more power. Sure it heats things up but damn good to know.

By the way from a noobs perspective, the xdf file made is like way easy to understand stuff. It just really allowed me to double check my thinking on how stuff gets changed.
« Last Edit: September 11, 2014, 07:03:45 PM by kingkhalilz » Logged
ddillenger
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« Reply #3 on: September 11, 2014, 07:05:24 PM »

This is what I've had the best experience with. Obviously you should lean it out until knock becomes an issue. With shit gas, you have to target a super rich AFR if you want to run any sort of timing.
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FlyboyS4
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« Reply #4 on: September 11, 2014, 07:25:27 PM »

I'd like to discuss fueling, and in specific, target lambda at WOT.

I've seen just about everywhere on this forum, and in other log files from VWs and Audis, it seems a lot of people tune for around 12.5AFR.  I've read everywhere, spoke with real life pro tuners (non ME7 tuners), and have positive experience with tuning for a richer AFR than that.  I typically shoot for a 11.8-11.4 AFR as this cools the egts, allows further timing advance, and makes more power safely than a leaner AFR.

Please discuss.

This is a subject for it's own thread.  It is a discussion worth having, but will pull the a Stage 1 tune far off topic.
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SB_GLI
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« Reply #5 on: September 11, 2014, 07:58:48 PM »

91 octane=11.5
93 octane=a bit leaner
Meth=12.5

These values are pretty much on par with my pump and w/m tunes for my jetta.
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nyet
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« Reply #6 on: September 11, 2014, 08:15:13 PM »

The restriction is high compression ratio + shitty gas.

If you drop compression, you can lean it out instead of adding AFR to get timing back.

On 91oct, you ideally should do both.
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ddillenger
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« Reply #7 on: September 11, 2014, 08:17:32 PM »

It's also worth noting that you can run DI engines leaner, that this is gas scale, and that euro fuel is much better than US.

Context and all.
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Lost
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« Reply #8 on: September 11, 2014, 09:11:35 PM »

What AFR do you tune for on E85 for best power?
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NOTORIOUS VR
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« Reply #9 on: September 12, 2014, 12:55:14 PM »

It should be noted that every engine/setup will like different lambda for best/safe power... they above guidelines are ok, but they're just guidelines in the end.

E85 seems like like 0.8-79 lambda for the most part.  Depends on other factors as well such as heat range of the plug, cams, etc.
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SCHNELL ENGINEERING BLOG ·  STANDALONE ECUS · TUNING · DYNO · WIRING · PARTS · VEMS
Google Talk: NOTORIOUS.VR
n00bs start here: http://s4wiki.com/wiki/Tuning
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« Reply #10 on: September 12, 2014, 02:12:39 PM »

It should be noted that every engine/setup will like different lambda for best/safe power... they above guidelines are ok, but they're just guidelines in the end.

E85 seems like like 0.8-79 lambda for the most part.  Depends on other factors as well such as heat range of the plug, cams, etc.

Well, it is an RS4, so 7 range plugs, oem cams.
Would it be any diff in winter request when its e70?
Trying to find nice middle.
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