"DYNO" Numbers For SOFTAILS
That's the big misconception with fuel injected bikes. You don't have to trade a performance tune for an economy tune or vice versa. Every bike I tune gets tuned for maximum performance in the ranges where you would want it, (i.e. higher R.P.M. and throttle positions) and more conservative in the cruising ranges for fuel economy.
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Joined: Feb 2013
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From: usa
Ok, if all goes as planned, dyno sheet should be attached. Kit which was installed was part number 27513-08A which has the 103 cylinders/pistons at 10.5:1 compression, SE259E cams, retained stock heads but kit includes valve springs, did maunal compression releases, new push rods, kept stock intake with stock tb. Also put on a Thunderheader at same time. Definetly woke the bike up!
Last edited by rtuuji; Feb 7, 2013 at 07:56 AM.
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Joined: Feb 2013
Posts: 53
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From: usa
I'm sending you a link for Docs Performance Tuning in Minneola, Florida. He's, arguably, one of the best tuners in the United States. Scroll down to the feedback with the red lettering. Tuning a bike set up pretty close to yours, he was able to squeeze out 92.12 tq & 76.75 hp SAE. He was tuning using a TTS vs. a PCV.
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Joined: Jan 2013
Posts: 33
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From: Killeen, TX
See Signature for mods... The lower hp/torque numbers were another bike with same set up minus cams.
I love the extra power, but I was not prepared for how rough the bike runs at low speeds... i.e. riding through the neighborhood at 30 mph in 3rd gear (2000 rpm).
Would upgraded heads work better with the cam and smooth it out, or would it make the ride even more choppy?
I love the extra power, but I was not prepared for how rough the bike runs at low speeds... i.e. riding through the neighborhood at 30 mph in 3rd gear (2000 rpm).
Would upgraded heads work better with the cam and smooth it out, or would it make the ride even more choppy?
Tourer
Joined: Oct 2012
Posts: 302
Likes: 8
From: Maryland
I love the extra power, but I was not prepared for how rough the bike runs at low speeds... i.e. riding through the neighborhood at 30 mph in 3rd gear (2000 rpm).
Would upgraded heads work better with the cam and smooth it out, or would it make the ride even more choppy?
Would upgraded heads work better with the cam and smooth it out, or would it make the ride even more choppy?
I'm not an expert but I have been researching cam dynamics for the same reason. (any professionals please correct me if I'm wrong)
You cam has a narrow Lobe Separation Angel (LSA) of 100.5 deg and 40 deg of overlap. This (along with your tune) plays a major roll in your low speed drivability. If you have had your bike professionally tuned and are still unhappy with the low speed drivability of your current cam you may want to consider a cam with a wider LSA and less overlap.
Below is a direct quote from a table in "Donny Peterson's unauthorized Harley Davidson Technical Guide". Its a good read for understanding the basics of Harley Performance.
Increased cam overlap:
Positive Effects:
1. Improved scavenging
2. Improved mid-high power
Negative Effects:
1. Idle quality reduction
2. Low rpm roughness
3. Low intake vacuum
Tight LSA
Positive:
1. Torque moves to lower rpm.
2. Increase maximum torque
3. Increase cylinder pressure
4. Increase cranking compression
5. Increased valve overlap
Negative:
1. Narrows power band
2. Detonation potential
3. Reduces idle vacuum
4. Roughidle
5. Decrease piston-to-valve clearance
Cams are complicated and sometimes the information out there seems contradictory. read read and read some more. These links are a good start and might help a little:
http://www.circletrack.com/techartic...e/viewall.html
http://www.compcams.com/Pages/413/ca...ion-angle.aspx
Last edited by Boost; Feb 9, 2013 at 08:04 AM.