DYNO Numbers for Baggers???
Road Warrior
Joined: May 2010
Posts: 1,294
Likes: 1
From: South FL
Sure, that's part of tuning. 0,2,5,7,10,15,20,25,30,40,60,80 and 100% tp's, each cylinder. While you can look at torque and hp you are looking at the afr line to calibrate the ve tables. Here is before and after afr lines at 20,40 and 60. Target afr for tuning is 13.5 to reference a straight line and then changed to different values once calibrated.
But then the a/f ratio without a relative HP, and torque will not be helpful to me, or any.
Do you have another graph that contains ALL the info: a/f, RPM @ each TP, hp, torque?
Road Captain
Joined: Sep 2007
Posts: 742
Likes: 4
From: Twin Cities, MN
Just found this chart from last year.... completely forgot about it! 
Anyway, she's running well and keeps cool all day long!
- 103" Build, (+0.010")- Wild Thing TC-26D Cam
- 54 mm HPInc TB
- Fuel Moto Header Pipe
- Crusher Slip-ons
- 10.8:1 CR
Anyway, she's running well and keeps cool all day long!
- 103" Build, (+0.010")- Wild Thing TC-26D Cam
- 54 mm HPInc TB
- Fuel Moto Header Pipe
- Crusher Slip-ons
- 10.8:1 CR
Last edited by Joker65; Feb 17, 2012 at 03:04 AM.
Road Warrior
Joined: May 2010
Posts: 1,294
Likes: 1
From: South FL
Very nice!
Elite HDF Member
Joined: Apr 2007
Posts: 3,766
Likes: 16
From: Roseville, CA
Yes, that's what I've meant!
That's exactly what I 've said earlier, the HP and torque from the Dyno doesn't mean much, as many posts have misled.
Again, the "riding range RPM" is what counts, as that is the real HP, and torque is produced at that RPM and the TP relatively. Obviously, the power (HP & Torque) will be lesser than the reading from Dyno.
I am wondering whether anyone has done the Dyno at 20%, 30%, and 50% TP, rather than 100% WOT.
That's exactly what I 've said earlier, the HP and torque from the Dyno doesn't mean much, as many posts have misled.
Again, the "riding range RPM" is what counts, as that is the real HP, and torque is produced at that RPM and the TP relatively. Obviously, the power (HP & Torque) will be lesser than the reading from Dyno.
I am wondering whether anyone has done the Dyno at 20%, 30%, and 50% TP, rather than 100% WOT.
A good tuner will tune for absolute power (WOT) and make adjustments at partial throttle for mileage, flat spots and rideability. Most of the guys here though are posting their peak power.
Road Warrior
Joined: May 2010
Posts: 1,294
Likes: 1
From: South FL
I love to see one! It must include 3 axises, I guess. But then, I don't know!
Stellar HDF Member
Joined: Sep 2007
Posts: 2,459
Likes: 674
From: Vancouver Island B.C.
Here's one that shows "step" testing at 5,7,10 and 15% throttle. Second one is the same bike at wot. Even the step testing isn't indicative of the power, for example on the 15% "run" the kpa at 1500 is probably 80+ kpa, and at 4000 rpm it is maybe 35-40. The way to test it is to use the torque module on the dyno and to adjust the load on the brake to hold the bike at a certain kpa (load) at a specific rpm. This is done to optimize the timing in the "cruise" area of the calibration. This isn't done on most tunes as most dyno's don't have the torque modules.
Road Warrior
Joined: Feb 2007
Posts: 1,730
Likes: 199
From: Vancouver BC
Here's one that shows "step" testing at 5,7,10 and 15% throttle. Second one is the same bike at wot. Even the step testing isn't indicative of the power, for example on the 15% "run" the kpa at 1500 is probably 80+ kpa, and at 4000 rpm it is maybe 35-40. The way to test it is to use the torque module on the dyno and to adjust the load on the brake to hold the bike at a certain kpa (load) at a specific rpm. This is done to optimize the timing in the "cruise" area of the calibration. This isn't done on most tunes as most dyno's don't have the torque modules.
I have had 3 of my Harley's dyno tuned and I've never seen a chart like this. I've seen maybe 100 charts online and never seen this. Seems like it would really tell if you're getting a good tune or not....
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