2019 Fat Bob performance
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HD EFI Guru
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The Harley catalog has separate charts for touring M8s and Softail M8s, and on the touring M8 it definitely lists it as using the high flow exhaust for Stage IV. But for the Softails, it shows the chart results as having been obtained with Street Cannons.
I think that even though the peak numbers are only a little higher with your build, the quality of power looks infinitely better with yours. I specifically chose not to get Stage IV because of the lousy torque curve, it shows even less torque down low than a stock bike does. Your cam and tune change that dramatically, resulting in what looks like a pretty much perfect combination of strong usable torque and good high-RPM horsepower.
Strong torque is the most important factor to me, and I would sacrifice ultimate HP to get that torque. Your build shows that we may not have to sacrifice, and the stock exhaust header is capable of supporting ~125 HP and ~130 tq.
How much of that is due to the cam and tune, and how much to the SE parts? Have you done a Fat Bob 114 with Street Cannons and just the TTS200?
I think that even though the peak numbers are only a little higher with your build, the quality of power looks infinitely better with yours. I specifically chose not to get Stage IV because of the lousy torque curve, it shows even less torque down low than a stock bike does. Your cam and tune change that dramatically, resulting in what looks like a pretty much perfect combination of strong usable torque and good high-RPM horsepower.
Strong torque is the most important factor to me, and I would sacrifice ultimate HP to get that torque. Your build shows that we may not have to sacrifice, and the stock exhaust header is capable of supporting ~125 HP and ~130 tq.
How much of that is due to the cam and tune, and how much to the SE parts? Have you done a Fat Bob 114 with Street Cannons and just the TTS200?
The SE 498, SE 515, TTS 200 or TTS 250 cams will NOT bolt in to a Stock 107, 114, 117 from HD. You will get piston to valve contact and break the valve springs. They all require replacement valve springs and additional piston to valve clearance. If you want to drop to bolt in, then your looking at the SE 447, SE 462, TTS 100 or TTS 150 cams.
Last edited by Steve Cole; Oct 21, 2018 at 04:47 PM.
Grand HDF Member
Joined: Nov 2017
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From: Texas
Thanks for the informative and detailed response! I didn't know the TTS200 required the additional components, but now that you have explained it, it makes sense.
I will take another look at the TTS150 then.
Have you had a chance to run the 150 in an otherwise stock 114 Softail with Street Cannons?
I will take another look at the TTS150 then.
Have you had a chance to run the 150 in an otherwise stock 114 Softail with Street Cannons?
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