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post #1 of 16 (permalink) Old 04-12-2014, 09:13 PM Thread Starter
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Default Dyno graph question

I've noticed on a high percentage of dyno charts posted here that the graph/numbers for TQ at around 2000 to just under 3000 are flat and vary a lot until 3000 then they climb and this seems to be high percentage with varied performance options and engine size. Being a high percentage why do they do this?

This is my chart.


This is a chart PJrom posted (great numbers)

Half crazy

PJrom again

pimtout

See the pattern again not all but they all have a common theme.

2015 Cross Country (bought new 7/11/15)
2015 Suzuki V-Strom DL650 (bought new 4/26/17)
2006 Triumph Rocket III Classic
1/4 turn throttle ring
Tank riser
VM-1 DR cams
Timing wheel +4
Lloydz high-flow air cleaner
Bassani baffled OEM mufflers
PC-V 118hp 116tq
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post #2 of 16 (permalink) Old 04-12-2014, 09:23 PM
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The dyno operator snaps the throttle open at around 2000 rpm... the intake air velocity drops to nothing then the engine recovers.
Sometimes the dip you see is a function of the exhaust system, sometimes the cams, or it could be too large a throttle body for the engine's displacement.
The Thor pipe has that dip after the initial hit... the Slash pipes were flat to 3200...

2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
Primo Clutch Spring, 31 Tooth Pulley w/Buell Belt.
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post #3 of 16 (permalink) Old 04-12-2014, 09:30 PM Thread Starter
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Quote:
Originally Posted by half_crazy View Post
The dyno operator snaps the throttle open at around 2000 rpm... the intake air velocity drops to nothing then the engine recovers.
Sometimes the dip you see is a function of the exhaust system, sometimes the cams, or it could be too large a throttle body for the engine's displacement.
The Thor pipe has that dip after the initial hit... the Slash pipes were flat to 3200...
That makes sense because mine is basically stock and yours is modified and they both do it in the same spot.

2015 Cross Country (bought new 7/11/15)
2015 Suzuki V-Strom DL650 (bought new 4/26/17)
2006 Triumph Rocket III Classic
1/4 turn throttle ring
Tank riser
VM-1 DR cams
Timing wheel +4
Lloydz high-flow air cleaner
Bassani baffled OEM mufflers
PC-V 118hp 116tq
If it's not broke, make it better
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post #4 of 16 (permalink) Old 06-07-2014, 12:50 AM Thread Starter
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Yes another question these are from two different dynos one 0 smoothing the other a 5 smoothing both SAE. Why is the one so extremely jagged and the other is relatively straight? No reason except curious.

Cool thing about having the run files is being able to compare one to another then I started messing with the smoothing and noticed a big difference.

Zero smoothing



Five smoothing

2015 Cross Country (bought new 7/11/15)
2015 Suzuki V-Strom DL650 (bought new 4/26/17)
2006 Triumph Rocket III Classic
1/4 turn throttle ring
Tank riser
VM-1 DR cams
Timing wheel +4
Lloydz high-flow air cleaner
Bassani baffled OEM mufflers
PC-V 118hp 116tq
If it's not broke, make it better
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post #5 of 16 (permalink) Old 06-07-2014, 02:08 AM
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my torque is up over 100 from right from the start, don't have that initial falter.
Perfect match of parts combined with smaller displacement maybe?
I lose out in the top end though over 106s and cammed 106s
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Victory Vegas 2010
Lloydz 109"cube big bore
" " 495 cams
" " TorqueTubes
" " timing wheel @4 deg.
" " Primary plate
" " IAV
RPW Slash pipes
PCV
Progressive 465 rear shock
Kingpin USD Forks
18" XC front wheel
1 3/4" 'Burleigh Bars'
Stebel air horn
12.106 @110.90mph
114/123

Victory Cross Country 2010 (106)
Lloyds air filter
" " VM1 Cams
Home gutted exhaust
Maximus
Both tuned by [email protected] Dyno
110/116

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post #6 of 16 (permalink) Old 06-07-2014, 09:50 AM
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securedownload%20-%20Copy.jpg

Does this graph make my torque look too fat?

Actually it looks like these Lil cams keep my torque pretty steady after 3k rpm. I know the bike seems to pull forever but the problem is I run out of road before I can realize the true power. I ride at 2300 to 2800 rpm always and when I find the space to roll on hard the power really comes on after 3200rpm. to hit 110 mph on this bike comes fast. Very impressive for a small price.

2011 Cross Country. D&D's wrapped - VM1DR cams - PC5 - LLoyds high performance filter and ATS (Adjustable Timing system). Power output 115HP/115FTLBS tuned by KMC. Klock Werks flip shield - RF/PBR300x4 amp - Hertz HCX 6.5's - Victory 6X9 Magnum Lids - Victory XM - HMD Black Pull Backs with Victory performance grips. PIAA Led3 driving lights. accessories from Arlen ness - Witch Doctors - Noemtz Designs - Kuryakyn. Blacked out treatment powder Coat by PPC Stuart fl.

Last edited by slickvic; 06-07-2014 at 09:57 AM.
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post #7 of 16 (permalink) Old 06-07-2014, 10:31 AM Thread Starter
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Look at the red line on my first chart from post #4 how erratic it is without smoothing but the other line is basically unaffected.

Sorry to be clear I asked another question different from the first.

2015 Cross Country (bought new 7/11/15)
2015 Suzuki V-Strom DL650 (bought new 4/26/17)
2006 Triumph Rocket III Classic
1/4 turn throttle ring
Tank riser
VM-1 DR cams
Timing wheel +4
Lloydz high-flow air cleaner
Bassani baffled OEM mufflers
PC-V 118hp 116tq
If it's not broke, make it better
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post #8 of 16 (permalink) Old 06-07-2014, 11:16 AM
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Just curious how much barometric pressure, temp and humidity affect the outcome. That might be a big ole academic question.


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2013 Hard-Ball - Lloydz VM1-DR cams, air filter, timing wheel, PCV, properly tuned at KMC
Master, Biltmore Lodge #446, AF&AM
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post #9 of 16 (permalink) Old 06-07-2014, 11:17 AM
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Quote:
Originally Posted by bsbabcock View Post
Just curious how much barometric pressure, temp and humidity affect the outcome. That might be a big ole academic question.


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Master, Biltmore Lodge #446, AF&AM
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post #10 of 16 (permalink) Old 06-07-2014, 11:28 AM
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Temps and humidity have a significant role in how the dyno tune ends up. When I took my bike to Rylan to get the cams and vfc3 installed you could almost cut the air it was so humid. only change between his dyno and this last one was the change to a PCV and the considerably lower temp & humidity. Gained 19hp and 18 lb.ft. of torque changing to the PCV.




2013 Anti-Freeze Green XC
Vance & Hines Slip On's
Lloyd's VM1-DR Cams & Timing Wheel
Lloydz Air Filter, Lloydz Rev-Extend
BadBoy Horn, PCV
Gustafsson +4 Windscreen
Picasso Nano PN2.350D Amp
Audison Voce' AV X6.5 Speakers
HMD520 Gorilla Bagger Bars

2010 XC 116 Big Bore - Gone
2006 Hammer - Gone

Last edited by toejam; 06-07-2014 at 11:44 AM.
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