Dyno disection
Road Warrior
Joined: Sep 2017
Posts: 1,609
Likes: 694
From: over the mountain
I don't ride a dyno sheet but I do ride the bike. You should ride a few hopped up bikes tuned correctly so you can discuss it correctly. I cant find my sheet. Its in the garage some where. But I can show you the invoices from Hammer if you don't believe me.
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,254
Likes: 4,947
From: England
I am not disputing the amount of power that your engine produces. I have not called you out and I don't disbelieve you.
Once a tuned pipe has been fitted to an engine there is a noticeable power band that may or may not then make the bike enjoyable to ride depending on what the owner was looking for.
How many posts are on here where people mutter about how they have lost bottom end torque and power after fitting certain pipes or slip-ons?
Once a tuned pipe has been fitted to an engine there is a noticeable power band that may or may not then make the bike enjoyable to ride depending on what the owner was looking for.
How many posts are on here where people mutter about how they have lost bottom end torque and power after fitting certain pipes or slip-ons?
Grand HDF Member
Joined: Dec 2012
Posts: 3,782
Likes: 1,202
From: river
I am sorry I shall rephrase that.
With the power band shifted to the upper rev range the ability for the bike to pull from low rpms that you might want to do whilst puttling round town is going to be difficult or lost altogether. Where you might of been able to ride in say 3rd gear you may now need to be in 2nd to keep the revs up.
This has nothing to do with a hammer performance upgrade to the engine or the fact the engine has been tuned correctly for best performance. The picture is quite clear and the explanation is very clear the low end power and torque has been shifted.
With the power band shifted to the upper rev range the ability for the bike to pull from low rpms that you might want to do whilst puttling round town is going to be difficult or lost altogether. Where you might of been able to ride in say 3rd gear you may now need to be in 2nd to keep the revs up.
This has nothing to do with a hammer performance upgrade to the engine or the fact the engine has been tuned correctly for best performance. The picture is quite clear and the explanation is very clear the low end power and torque has been shifted.
I get what youre saying, but who gives a shxt? Really? Its a motorcycle with 5 gears lmao
what about all the stock 883s and 1200s on the road? Lmao
do you ride a Hondamatic? Ha
Seasoned HDF Member
Joined: Sep 2018
Posts: 6,056
Likes: 1,819
From: Kalifornia
Apache Snow
I wonder how the above chart compares to a stock 1200. Looks like its about 10hp and 10-15 torque above stock, WHERE THE STOCK REV LIMIT IS. Not comparing that chart to stock at all, since it continues well past stock limits.
Would be curious to see stock next to it though.
I wonder how the above chart compares to a stock 1200. Looks like its about 10hp and 10-15 torque above stock, WHERE THE STOCK REV LIMIT IS. Not comparing that chart to stock at all, since it continues well past stock limits.
Would be curious to see stock next to it though.
Road Warrior
Joined: Sep 2017
Posts: 1,609
Likes: 694
From: over the mountain
There may be a chart like that on Hammers web page. They have done hundreds of them. My bike has the 560 cams that builds hp past the stock rev limit. I got mine set at 7400 RPM. The head work and valve springs I have are good to 8000 RPM. I have the 100 hp Hammer kit but with a good tune will get up to 105 HP. But I have some other things not in the 100 hp kit. I have S&S rocker arms and the ported throttle body that gets me a little more. My bike runs really well from idle through red line. It has next to no vibration. My mirrors are clear from idle to redline. .The bike is such a joy to ride. There may be better exhaust but I don't like loud. I had Rush slip ons that dynoed really great on Hammers dyno but the police were starting to look at me too much. The Supertrapp is quite but a good performer. It would be a shame to put all that money in my bike to put a non performing mufflers on my bike just because I liked loud. Many people go for pipes because of the sound and really kill their performance but I digress.
Last edited by apache snow; Oct 19, 2019 at 08:10 PM.
Seasoned HDF Member
Joined: Sep 2018
Posts: 6,056
Likes: 1,819
From: Kalifornia
Yea I bought the Cobras because of sound and perf sucked. The TTIs installed made a huge difference, and actually eliminated much of the shudder when lugging the motor. Before the Cobras even my modified stockers would REALLY let you know you were lugging, without the TTIs the Cobras all but killed the motor if I tried to lug.
After the TTi install I really had to try hard to get any shudder at all, come out of a curve at the lower limit of power for that gear, and it just pulled smoothly all the way up. They are a bit too loud, and I have them on craigslist right now, but if they do not sell for my asking price, I will put them back on.
In short, I really see what a difference exhaust can make for performance. That is on a basically stock bike, so I can imagine on one like yours.
After the TTi install I really had to try hard to get any shudder at all, come out of a curve at the lower limit of power for that gear, and it just pulled smoothly all the way up. They are a bit too loud, and I have them on craigslist right now, but if they do not sell for my asking price, I will put them back on.
In short, I really see what a difference exhaust can make for performance. That is on a basically stock bike, so I can imagine on one like yours.
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