Torque, baffle size, dyno
Road Warrior
Joined: Jul 2009
Posts: 1,408
Likes: 1,808
From: pa
My bet is the slip ons the M8 especially in stock or stage 2 is effected a lot by exhaust. Keep the baffle size at most 1.75 and you'll pick up the low end tq you're looking for. Bigger baffle may sound better and make you think you're going faster but 9x's out of 10 the opposite is true.The street cannons are the max baffle size you should have and I think for a basic stage 2 they are slightly to free flowing but better than many with 2" baffles.
Bigger = sound little better higher hp number by a couple lower tq.
Put your old slip ons back on bet you'll feel it respond better,granted top end hp will suffer.
Bigger = sound little better higher hp number by a couple lower tq.
Put your old slip ons back on bet you'll feel it respond better,granted top end hp will suffer.
Stellar HDF Member
Joined: Sep 2009
Posts: 2,114
Likes: 666
OP - What you have is an anemic cam. I made the same mistake thinking I would be impressed with the newfound down low torque. A bit more torque up higher and a bit less down low...where I wanted more.
Just pick one of the cams tested by TTS and Feul Moto. They all kick the 447s ****.
As soon as I get time to swap to another, much better cam, I will.
Bob
Just pick one of the cams tested by TTS and Feul Moto. They all kick the 447s ****.
As soon as I get time to swap to another, much better cam, I will.
Bob
Thread Starter
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Road Master
Joined: Jul 2011
Posts: 1,030
Likes: 65
From: Calgary AB
But, the day I was there, there were only 3 bikes to go on the dyno. I'm shocked more people aren't taking advantage of it. Possibly, the average buyer just doesn't care.
Thread Starter
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Road Master
Joined: Jul 2011
Posts: 1,030
Likes: 65
From: Calgary AB
OP - What you have is an anemic cam. I made the same mistake thinking I would be impressed with the newfound down low torque. A bit more torque up higher and a bit less down low...where I wanted more.
Just pick one of the cams tested by TTS and Feul Moto. They all kick the 447s ****.
As soon as I get time to swap to another, much better cam, I will.
Bob
Just pick one of the cams tested by TTS and Feul Moto. They all kick the 447s ****.
As soon as I get time to swap to another, much better cam, I will.
Bob
So I'm looking for a one year solution.
If you looked at Steve Cole and my cam testing you will see that it was done with the sparsest of equipment: Hi-flow air cleaner, recored stock mufflers, decatted header. We got as good or better numbers out of most of the cams as what other testers have gotten.
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Road Master
Joined: Jul 2011
Posts: 1,030
Likes: 65
From: Calgary AB
Why not try the Thunder Torque Inserts, have your dealer give you another spin on the dyno to see if it alleviates your problem and moves your torque to the left. If it does and you're OK with the sound, run them for a year until you can do as you wish. If it does and you don't like the sound you can try different mufflers.
If you looked at Steve Cole and my cam testing you will see that it was done with the sparsest of equipment: Hi-flow air cleaner, recored stock mufflers, decatted header. We got as good or better numbers out of most of the cams as what other testers have gotten.
If you looked at Steve Cole and my cam testing you will see that it was done with the sparsest of equipment: Hi-flow air cleaner, recored stock mufflers, decatted header. We got as good or better numbers out of most of the cams as what other testers have gotten.
I'm just wondering if anyone has seen a chart crater on the left like this with 2 1/2" baffles. If it's actually a Street Tuner issue, there's little I can do about it.
I will test it with the inserts, if Spring ever comes. An inexpensive way to check it.
Stellar HDF Member
Joined: Dec 2009
Posts: 2,561
Likes: 280
From: North Cental Iowa
An even less expensive & way easier way to see if it's the mufflers is to put your stock mufflers back on. There's a couple of people here running the TQ cam & street tuner with stock mufflers & they say the performance is good. You can change mufflers in about 15 minutes, to try the TQ cones you have to remove the headpipe, more like an hour or two. The SCs might perform a little better & sound quite a bit better, but the stock mufflers should show you if it's the mufflers that's holding the TQ back.
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Joe Kucinski
Grand HDF Member
Joined: Nov 2017
Posts: 4,252
Likes: 3,135
From: Texas
OP, I don't know what to tell you, but -- that chart looks awful. I just looked in the big book and, according to Harley's charts, the 447 in a touring bike should be delivering 100+ ft/lbs at 2500, 106+ at 3000 and 108 at 3500.
You should be showing 95 hp at 5500 RPM.
Everything on your chart is low, but the low-end torque looks just wrong. I don't know if it's the slip-ons or the old winter gas or what, but that ain't what a 447 Stage II bike should look like.
You should be showing 95 hp at 5500 RPM.
Everything on your chart is low, but the low-end torque looks just wrong. I don't know if it's the slip-ons or the old winter gas or what, but that ain't what a 447 Stage II bike should look like.
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Road Master
Joined: Jul 2011
Posts: 1,030
Likes: 65
From: Calgary AB
An even less expensive & way easier way to see if it's the mufflers is to put your stock mufflers back on. There's a couple of people here running the TQ cam & street tuner with stock mufflers & they say the performance is good. You can change mufflers in about 15 minutes, to try the TQ cones you have to remove the headpipe, more like an hour or two. The SCs might perform a little better & sound quite a bit better, but the stock mufflers should show you if it's the mufflers that's holding the TQ back.
That’s a great idea.
The Torque Cones mount where the baffle mounts, you don’t have to remove the header. But I checked my V&H slip ons, the bolt hole does not go through, so mounting them would require I drill them out. I’d rather not do that.
The Torque Cones mount where the baffle mounts, you don’t have to remove the header. But I checked my V&H slip ons, the bolt hole does not go through, so mounting them would require I drill them out. I’d rather not do that.
Last edited by dwagar; Apr 3, 2018 at 06:22 PM.