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post #1 of 16 (permalink) Old 07-24-2019, 12:07 AM Thread Starter
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2017 road glide special stage 4 without 64mm throttle body

So I had dealer do A stage 4 on my ride. used tts-200 cam and tts master tune tuner. dealer talked me out of including 64mm throttle body. said it was too much and would choke out my low end torque. other components were S&S mufflers with power duals. NUMBERS WERE 127 TORQUE AND 118HP. So would the 64mm throttle body improve my hp. numbers without sacrificing my torque? also didnt have decible reducers installed in mufflers. would they also improve performance? thank you for any help. Ido already have the 64mm throttle body ready for install if it will not hurt my torque.
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post #2 of 16 (permalink) Old 07-24-2019, 07:23 AM
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Sounds like a FUN ride as is!

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post #3 of 16 (permalink) Old 07-24-2019, 09:01 AM
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The decibel reducer are more for low end torque for horsepower its not only the throttle body but injectors as well. Are the SE heads stock or did you get them ported and milled to CC. Do you have a dyno sheet to show? Cant tell if I cant see that sheet.


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2007 Harley Davidson FLSTF, 107B Twin Cam Engine, Rosa Cycles Stage 3 Heads and CP Flat Pistons, S&S 585 cam with 4 degree advance; 10:50:1 CR. SE Heavy Breather, Rosa Cycle Crank rebuild and V&H Big Radius 2-into-1
2017 Harley Davidson FLTRU, Stock 107 Milwaukee 8.
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post #4 of 16 (permalink) Old 07-24-2019, 11:06 AM Thread Starter
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stage 4. it has the cnc ported heads and 5.5 injectors.
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post #5 of 16 (permalink) Old 07-24-2019, 02:32 PM
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I think that size of Cam, if you went 58MM on the TB, you're good for the build - Those number are not too bad but of course can be improved with a bigger Cam, TB and 2:1.....but the $$ vs Rewards aspect is a bridge that only you can cross

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post #6 of 16 (permalink) Old 07-24-2019, 06:29 PM Thread Starter
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how big A cam is the tts-200? I could not find any specs on it. and do you think the 64mm would be too much?
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post #7 of 16 (permalink) Old 07-29-2019, 09:15 PM
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Not sure why your dealer talked you out of the SE T/B. It's a better bang for the buck than the SE heads on the M8. I added just the 64MM T/B and injectors, and did a before and after dyno run. It added 3-4 hp and tq right from idle all the way through the rpm band. And that was with a TTS-200 cam.

My 2017 stage 3 did 130 tq and 120 hp with the SE TB, TTS-200, fullsac header and slip-on's

2017 RGS- Revolution 124" TTS 200

Last edited by Mainecat; 07-29-2019 at 09:22 PM.
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post #8 of 16 (permalink) Old 07-30-2019, 11:17 AM Thread Starter
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that's great! mine is going back to the dyno on Thursday for the 64 throttle body tune. now just trying to decide if I should put in the decibel reducers for better performance.
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post #9 of 16 (permalink) Old 07-30-2019, 10:43 PM
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The TTS200 is a 0-4,500 low rpm torque cam. Unless your looking for it to be real snappy below 3,000 you should be fine without the db reducers. My fullsac header and slip-on's with 2 1/4" baffles peaked 130 torque at 3,200. It pulls good down low but is snappiest from 2,800-4,000.

BTW- porting the manifold is good for a few extra hp's as well.

2017 RGS- Revolution 124" TTS 200
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post #10 of 16 (permalink) Old 07-31-2019, 10:10 AM Thread Starter
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thanks! I already have the decibel reducers. never did A dyno with them in. figured I will see what they do for my performance. hoping they don't hurt my horsepower. I don't think it will affect my tune if I take them out when I want it to be louder.
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