AFR Tuning questions

[RobertTrivanovic]

So quick question about tuning… When coming down off higher RPM at 0% throttle the AFR sky rockets to the lean side, I tried to tune it out to some extent but couldn't get it even close. I see from this video http://www.youtube.com/watch?v=dP6mxVeA5A4 that even the sleds at Dakota Perf are doing this. Is this an issue? If I push the throttle to any extent at all it will go back down to around 13.

 

[Snowmow]

No issue. It's normal.

 

[m8magicandmystery]

yep...fuel cools and your chopping the fuel..creates lean and hot for short instant

 

[RobertTrivanovic]

Thanks, yeah I tried to tune it out and I got it a bit better but for the most part its not going anywhere.

 

[m8magicandmystery]

just remember after a real hard tough pull its better to putz around or feather the throttle back and forth then think your doing it a favor by letting it go straight to idle..

 

[av8er]

I'm running about 12.4 WOT

12.2 is supposed to be perfect on Twisted extreme kit, but a tad rich don't hurt.

 

[kkhaos]

A/F Gauge

I think some of the issues with tuning and everyone's numbers being different are the accuracy of the A/F gauge. I run 2 A/F gauges and they easily read .5 to 1 full number off. I even tried per the directions to calibrate the sensor.
(The book states... Calibrate at elevation change and every hour if using leaded fuels, Must remove sensor to calibrate).

How many people calibrate there sensor? 1 maybe out of 100?

I run a NGK AFX Gauge with a wideband sensor 91101 and a AEM A/F gauge.

 

[RobertTrivanovic]

Alright so what are your guys gauges reading in the mid range and at idle? I know everyone will be different and everyone will have a different sweet spot, I'm just scared of leaning it out to much. Right now my idle is around 14.5 and my mid range is generally in the 12-13.5 range. Pretty sure thats WAY to fat in the mid range from how it rides but I just want some confirmation I'm not going to melt my motor going leaner. Top end is way fat too but thats not what we are talking about, it still rips up there

 

[Snowmow]

14.5 Cruzing down the trail and 11.8-12.2 WOT

 

[RobertTrivanovic]

14.5 Cruzing down the trail and 11.8-12.2 WOT

Thats exactly what I hoped to hear!

 

[Speeedracer]

Anyone know what error code E8 error on afr is?

 

[carlc]

Google says sensor failure


Sent from my iPhone using Tapatalk

 

[RobertTrivanovic]

Before you go and change the sensor make sure all your wiring is tight and there's no shorts or anything like that. Also try cleaning the sensor itself.

 

[Kenny_h2o]

Before you go and change the sensor make sure all your wiring is tight and there's no shorts or anything like that. Also try cleaning the sensor itself.

How would you clean your sensor, I was always told that they're not meant to be cleaned in any way. I was thinking brake clean or something?

I have a few that could be cleaned, Lead in AV Gas bungs them up fast.