Is This Caused By EGR?

[Fritzables]

Hi All,

I have a 2017 Fat Boy that has the 110CI Kit installed.
The Cams are SE585.
The Heads are SE CNC Ported.
The Air Cleaner is a K&N Free Flowing type.
Yhe Exhaust is a Rinehart 2-1.
I tune using the Master Tune system.

I have attached a screen dump of two VTune runs, the one on the left is prior to a VTune whilst the one on the right is after I do a datalogger run.
The graphic is showing a hole appearing after a datalogger run is performed, around 40 kPa MAP.
The Front Cylinder is sweet. The issue is only occurring on the Rear Cylinder.
When I look at the O2 values around the area, you can see it going lean.

I am now wondering if I should be increasing the values in the EGR Effect Table for the Rear around the area in an effort to combat the problem??

Pete

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[rigidthumper]

Drifting lean may be reversion, or incorrect O2 depth placement. Verify the sensor is in the exhaust stream- those adaptors sometimes are way too long.

[Fritzables]

Hey Rigid,

I checked the depth of the Rear & Front O2 Sensor bosses and all is fine in that area.
So, I believe it's a ReVerb issue.

I will bring the values on the EGR Table and see how much it impacts the VE Table.

Pete

[Sunny Jim]

Also check for any manifold leaks.

[Fritzables]

But would a leaking Manifold create such a dip??