PowerVision: Front vs Rear Cylinder Airflow VE - Road Glide Forums
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post #1 of 14 (permalink) Old 03-06-2016, 05:28 PM Thread Starter
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PowerVision: Front vs Rear Cylinder Airflow VE

Question to the tuners out there:

I have a Powervision with a custom tune to match aftermarket pipes and screaming eagle airfilter. The Airflow VE table for front vs rear cyclinders is quite different. The reason I ask is the rear exhaust header seems to run much hotter than the front exhaust. The VE table for the rear is set broadly for a richer mixture than the front. I'd heard that a richer mixture helps run a cooler cylinder ... but maybe there's more unburned fuel in the exhaust that's causing the much hotter rear header? Should the rear/front VE tables be substantially different, or would you expect the tables to be more similar?

My baby: '12 RGC Vivid Black, 16" Madstad, Mustang Super Tourer seat - 1st road bike in 35 years
What I grew up riding: street - 1969 Honda 160 2-cyl street with straight pipes; x-country dirt racing - Honda Elsinore 250
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post #2 of 14 (permalink) Old 03-06-2016, 06:09 PM
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The ve tables will certainly be different, but the numbers for the rear cylinder ve table will generally be similar to the front cylinders. Your actual a/f ratio seen on the PV screen should be very near identical.


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post #3 of 14 (permalink) Old 03-06-2016, 07:38 PM Thread Starter
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This is the front Cyl VE table:

82.0 79.0 83.0 76.0 80.0 78.0 84.4 85.4 86.3 86.6 96.2 97.5
82.0 78.6 83.2 76.4 80.7 78.0 85.0 87.0 87.8 87.3 97.5 98.9
82.0 80.6 85.3 78.4 81.9 78.6 86.2 88.2 88.4 88.4 99.5 101.5
81.5 81.2 85.9 79.8 83.2 79.5 87.8 90.0 90.2 89.7 101.5 104.9
80.0 94.3 103.5 101.0 97.4 97.0 94.6 95.6 94.7 87.0 99.4 103.2
76.5 92.9 95.4 94.0 94.3 95.2 96.6 92.5 93.8 89.9 98.7 98.9
74.0 91.3 95.0 91.0 88.8 81.5 79.6 77.7 75.2 76.1 98.6 101.0
73.5 93.8 97.1 93.3 89.8 88.7 85.8 85.2 84.4 80.0 103.1 107.7
76.0 97.0 100.5 100.0 98.5 96.4 90.9 90.4 87.3 89.8 106.3 109.0
78.0 91.8 94.3 94.2 94.8 93.1 91.2 90.6 89.5 89.8 108.8 112.5
77.5 96.6 102.3 100.5 97.3 97.6 93.8 95.7 95.9 95.4 114.1 116.6
72.5 97.9 101.4 107.3 109.7 103.6 102.3 101.6 100.1 98.7 114.7 118.2
66.5 90.3 90.0 90.8 92.5 93.5 98.7 95.9 96.0 95.6 108.9 110.7
63.0 83.4 87.6 93.1 93.5 96.1 95.0 91.8 91.2 89.8 100.8 100.9
64.5 87.9 91.7 96.4 97.6 97.9 96.4 91.4 88.9 87.1 92.5 93.7
67.0 84.4 88.7 94.3 93.6 97.0 94.0 87.5 84.3 81.0 84.0 83.4
68.5 80.6 84.7 94.3 95.7 97.4 93.7 86.3 82.9 76.9 75.7 74.7
68.5 80.6 84.7 94.3 95.7 96.9 93.1 85.8 82.4 78.1 76.3 75.3
68.5 80.6 84.7 94.3 95.7 96.9 93.1 85.8 82.4 78.1 76.3 75.3
68.5 80.6 84.7 94.3 95.7 96.9 93.1 85.8 82.4 78.1 76.3 75.3

And this is the Rear Cyl:

86.0 85.0 89.3 90.7 83.3 80.0 80.5 80.7 81.5 83.2 104.0 105.3
86.0 87.1 92.2 91.3 85.2 85.4 81.5 81.2 82.1 83.2 105.3 107.6
86.0 88.2 93.7 91.2 86.2 86.4 82.6 82.3 82.6 78.6 106.9 109.0
85.5 90.6 96.6 91.4 87.3 87.9 84.2 84.5 83.7 79.1 108.3 110.5
84.0 91.1 93.1 88.6 88.0 86.9 83.2 80.7 80.1 81.5 109.0 111.9
78.5 88.1 91.2 93.0 91.3 88.6 86.3 84.3 87.5 88.5 108.2 116.0
72.0 92.1 99.7 98.2 101.1 108.5 108.6 102.6 97.7 99.2 108.6 114.4
69.0 93.3 97.2 97.0 95.7 95.0 97.0 93.3 87.7 83.2 107.0 114.0
71.5 100.4 104.9 101.4 102.0 99.8 96.3 87.4 89.6 87.6 106.8 114.6
77.5 95.1 95.4 96.3 95.0 96.0 88.6 86.3 84.3 85.7 108.0 117.2
81.5 95.8 101.4 100.0 99.9 95.9 92.9 90.2 88.5 87.8 107.8 117.1
80.0 98.2 103.2 105.2 105.7 104.3 99.2 94.5 92.6 94.8 115.5 116.6
72.5 95.6 100.6 105.0 107.8 109.5 100.7 98.4 96.8 98.7 109.9 111.8
65.5 93.8 99.3 103.4 105.0 109.6 104.5 100.9 88.8 96.3 102.6 103.6
63.0 92.2 96.7 100.9 104.3 108.6 103.9 97.2 93.8 92.0 94.1 94.2
68.0 89.6 91.4 88.8 97.2 100.5 94.9 89.6 86.2 85.4 89.5 87.9
75.0 92.6 97.3 92.6 95.6 98.4 95.1 87.8 85.0 82.6 77.8 78.0
79.5 87.4 91.8 92.6 95.6 98.4 95.1 87.8 85.0 81.9 77.2 77.2
80.0 87.4 91.8 92.6 95.6 98.4 95.1 87.8 85.0 81.9 77.5 77.5
80.0 87.4 91.8 92.6 95.6 98.4 95.1 87.8 85.0 81.9 77.5 77.5
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post #4 of 14 (permalink) Old 03-06-2016, 08:58 PM
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Where did you get this tune? There is no consistency on either cylinder table


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post #5 of 14 (permalink) Old 03-07-2016, 11:27 AM
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post #6 of 14 (permalink) Old 03-07-2016, 02:39 PM
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Yes, you will generally have higher VEs for the rear cylinder.

Now when you say "custom tune", do you mean that someone put your bike on a dyno and developed the tune? If not, you don't have a custom tune. You'd do well to use the PV to do some tuning runs if that's the case.

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post #7 of 14 (permalink) Old 03-08-2016, 01:29 PM Thread Starter
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Given the tune came in the PowerVision pre-loaded as matching the exhaust, to be fair to the exhaust supplier, I don't wish to name names because it may be perfectly fine and its just my lack of knowledge to the custom tune world.

Regardless, given a pre-setup tune like that may or may not be an exact match for my setup ... I've decided to go ahead and go all in and get the PV Target Tune and then auto tune it in advanced mode.

Thank you to everyone for your inputs and support.

My baby: '12 RGC Vivid Black, 16" Madstad, Mustang Super Tourer seat - 1st road bike in 35 years
What I grew up riding: street - 1969 Honda 160 2-cyl street with straight pipes; x-country dirt racing - Honda Elsinore 250

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post #8 of 14 (permalink) Old 03-08-2016, 01:39 PM
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You don't need to do that. Try tuning with what you have before you start tossing more money at it.

'05 Night Train, '16 Road Glide Ultra


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post #9 of 14 (permalink) Old 03-08-2016, 03:32 PM
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Quote:
Originally Posted by '05Train View Post
You don't need to do that. Try tuning with what you have before you start tossing more money at it.
Some of his VE's jump 21 points from one cell to the next in the 70 to 80 percent throttle ranges. Hard to immagine that can be right, and a/f ratios required in these areas (12.8 to 13.2 range) are beyond the capability of narrow band o2 sensors


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post #10 of 14 (permalink) Old 03-08-2016, 07:40 PM
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Quote:
Originally Posted by mocotom View Post
Some of his VE's jump 21 points from one cell to the next in the 70 to 80 percent throttle ranges. Hard to immagine that can be right, and a/f ratios required in these areas (12.8 to 13.2 range) are beyond the capability of narrow band o2 sensors
Which is why the PV puts the entire map into stoich....That way the stock O2s can read it. Point is, he's got a canned map and hasn't done any tuning. So he should start with the equipment he's already paid for. Then, if he's still not happy he can pay for the next step. But he's got a Stage 1 bike. Tuning that ain't rocket surgery.

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