Triumphrat

Kframe

So I'm thinking about doing the ARK or cutting up my stocker, but still not sure.

Right now, my 865 with TORs easily goes up to 106 (indicated by GPS) with more to go.
I don't really need to go faster, but what I'm looking for is more torque in the midrange so I can accelerate from 0-60 and 60-90 quicker.

If I understand it correctly, HP is what is gonna push that wind out of the way and reach the highest speeds, and torque is what makes the change in velocity possible.
So I think I need more torque.
I don't just want to switch sprockets because then I'll be searching even harder for "6th gear" at speed.

Thoughts?
-K

ohiorider

Here's my thoughts on the matter. Move the max torque lower in the rpm range and you'll gain hp in the lower rpm range.

HP=Torque x RPM. More specifically, using US values, HP = Torque in foot pounds X RPM divided by 5255. In other words, HP is a calculation. If you increase torque at any rpm, the HP at that specific rpm will be higher. If you move maximum torque lower in the RPM range, you'll also develop more HP there than before. If you move maximum torque higher in the RPM range, then max HP will also increase at the higher RPM.

Here's how I understand it:
Torque is the ability to do work.
HP defines the ability do do work within a given time frame.

Or .... I can curl 150 pounds of weight (torque)
I can curl 150 pounds of weight 7 times a minute (hp)
I can't so the example is purely academic!

I think the original formula for horsepower was defined by James Watt, invertor of the steam engine, who said that one horsepower was the ability to lift 33,000 pounds one foot in one minute.

Now I'm confused!

Bob

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2003 T100 (790cc) Lucifer Org and Silv: 122/42 jets, TORs, 17T, UNI filter, no AI, Polaris bellmouth, Metzeler ME880 tires, Progressive 440 shocks (105/150 springs),11-1126 fork springs, gaiters, MotoTwin low bars, 6024 lamp, htd grips, 12v outlet.

vanson1200r

Torque. If you want top end the Triumph twin is not the bike for you. The twin’s strong point is its torque. Exploit it

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vanson1200r:2007 Thruxton Red with white stripe. AI, Emgo's, 125's, Shim's, Polaris Bellmouth, K&N.

Kframe

Right, I don't want/need more top end. I touched 106 briefly just because I could. But for my type of riding, torque is what I'm looking for.

So, how? And I'm not thinking really crazy stuff like big bores and hot cams and stuff. I don't have that kind of moolah.

-K

mikeinva

Do away with the air box put some good pipes on it you will get both hp and ft/lbs.If that dont give you enough put some 42mm mikuni carbs on .Depends on how much you want and how much you want to spend.
Torque can give you top end to .These bikes can be made to run faster then most want to ride them.These bikes dont make hp like jap bikes ,they do it at lower rpms that makes them more of a handful to ride fast.

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FrankBlack

You were asking about hp and torque gains after doing the ARK I think. At the moment I'm at 64.11 rear wheel bhp (I think that's around 75 bhp at the crank) and 54 max torque. Still working on the tweaks (see dyno in signature)

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Silver Bonneville 2007
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Loxpump

I think the original formula for horsepower was defined by James Watt, invertor of the steam engine, who said that one horsepower was the ability to lift 33,000 pounds one foot in one minute.

Now I'm confused!

Bob[/quote]

Awhile back, a gentleman by the name of Watt (the same gent who did all that neat stuff with steam engines) made some observations, and concluded that the average horse of the time could lift a 550 pound weight one foot in one second, thereby performing work at the rate of 550 foot pounds per second, or 33,000 foot pounds per minute, for an eight hour shift, more or less. He then published those observations, and stated that 33,000 foot pounds per minute of work was equivalent to the power of one horse, or, one horsepower.

I knew an actual horse was used in the calculations somewhere, what if they were using ponies, ox, or llama's. Would we be discussing our rear wheel "Ponypower"!

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rodburner

Just my personal observation,but my bike with the airbox and with a homemade pipe made a VERY large amount of torque over stock,at the expense of high rpm HP and speed. It pulled 5th from 40 to 80 hard then slowly ran out of steam.Without the air box,that great bottom/mid was reduced quite a bit,but the engine spins like crazy now,and pulls good at higher rpm.I`ve tinkered with several pipes to get that feeling back,and this current one seems to do a pretty good all around job.I`m going to start a project to lengthen the intake tract to see if I can get that mid back,without the clunky airbox.

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Kframe

Well, I've already got TORs on it.
In searching through the older threads some people were saying that it doesn't make sense to do the ARK if you have TORs, as they aren't open enough.

But now it seems that the new TORs are straight through and are more open than the older (2001-2006?) TORs? Mine are the straight through type.
So that brings us back to the drawing board.

Sure if I had $2-3k to drop into this bike I'd probably 904, FCR etc, but I'm trying to ooomph it up a bit (and without voiding the warranty) for under $600.

I like the sound of the TORs, and that I can ride them loud or quiet.

All I want is a bit more kick in the pants when I roll on.

Another option would be to gut the airbox and add a K&N or Uni and jet accordingly.

If I do my own airbox chop and buy some pods, I could use the $200 I saved and upgrade the suspension with new fork springs.

Regarding sprockets, I think in the '07 865 stock is 18. So a 17 would give me more felt torque but at cruising speeds I'd be searching for a higher gear; and conversely a 19 would be better for cruising but would give up some felt torque?
So that doesn't seem like a good choice for me, I think.

Lastly, am I right that it would not make sense to get hot plugs and nology stuff unless the intake and exhaust was already optimized?

This economic stimulus check is burning a hole in my pocket but I don't want to just waste it on incompatible mods.

As you can see, I'm pretty undecided, just looking for a little guidance from you guys that have already gone through this.

Thanks, -K

Soulrebel

If you remove your airbox you should wear a cup in preparation for a kick in the pants. All kidding aside. Airbox removal + pods = more fun for < money.