1st log after dyno tune w/ WB..lean a/f

dragrush · 07-30-2008, 06:17 PM

Just installed AEM WB and did a 3rd gear pull. Got it dyno tuned professionally 15 months ago. Now looking at the a/f it gets as lean as 12.7 with 50/50 water/meth injection, but it still has no knock. Along with 20deg of timing.
What a/f ratio is usually aimed for with a 50/50 mix on 93 pump?
AEM WB reads AEMWBgaugeR1 on link

here is a dsmlink log 3rd gear pull 93oct 20psi

1992awdlaser · 07-30-2008, 07:29 PM

Does the gauge read the same thing? The aem widebands are known to not log exactly what the gauge says. You should go off the gauge. If the gauge is reading different then try logging under a different name.

dragrush · 07-30-2008, 09:08 PM

Not sure if it reads the same at wot or higher rpms, but at idle and cruise its within .2 I actually did another log at it went as lean as 14.2 with 13deg of timing and 17lbs of boost at 4600rpms yet still no knock

between 4000-4500 the a/f wentfrom 11.3-12.1 cant seem to make it consistant and 14.2 at 4600

1992awdlaser · 07-30-2008, 09:17 PM

If you have a stock maf I am going to say you have a leak between the maf and turbo inlet, which might be contributing to your problem. I say this because of your boostest being so much lower than actual boost between 5,000-6,000 rpm.

CanadianTSi · 07-31-2008, 07:37 PM

I'd add some fuel and richen it up to around 11.5 and then turn up the boost.

dragrush · 07-31-2008, 08:58 PM

I checked for leaks pre turbo and did not find any...I temp blocked off the BOV recirculation to make sure. At idle the boostest reads -21-22 but my boost gauge reads -15...so it is a little off.....Not really sure what to do with that?

I richened it up a little staying around 11.5-12.2 a/f and that pretty much got rid of all my knock. But if im getting away with 13.5-14 a/f with no knock, should I keep it where it is or richen it up to be safe?
Ill turn up the boost some more and post another log...thanks for help

Rob10_99 · 07-31-2008, 09:12 PM

Wow thats way lean, I'm suprised you didn't get any knock.
IMO anything under 12:1 is fine depending on ambient temps. Here in Phoenix is hell on cars when the pavement will burn your feet before noon.
Where your at now, I would suggest inspecting your knock sensor. Has it registered any reliable knock in the recent past?

dragrush · 07-31-2008, 09:26 PM

As far as I know of the knock sensor is working...I was getting some knock up top, richened it up and it went away..its a fairly new sensor around 2000 miles on it.

Anyone know what a/f people aim for with a 50/50 meth/water?

1992awdlaser · 08-01-2008, 04:17 AM

I aim for around 10.8:1-11.2:1 air/fuel on pump gas. I don't have meth but I would aim fo the same air/fuel ratio. I like to make power with timing.

Maglin · 08-11-2008, 12:57 PM

I personally aim for no richer than 11.2:1 and no leaner than 11.5:1 on pump WOT. Cruise I shoot for 15.2:1-15.7:1 for best econ.