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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-03-2012, 08:53 PM   #1 (permalink)
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To increase low end torque

I have a 2012 T100 Bonneville. It is a beautiful motorcycle, but I wish it had more low end torque. Can someone tell me if there are ways to do that. Remapping, new exhaust pipes? I am wondering if I would have liked the 270 engine better, such as in the scrambler. Again, I am asking for more low end torque, not just torque, so I don't think boring would be the answer. This isn't of life or death importance, I am just curious, and would like to know what others think. Thanks in advance.
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Old 12-03-2012, 09:06 PM   #2 (permalink)
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The cheapest and simplist way is to fit a 17 tooth front sprocket, although this will lower top speed and increase fuel consumption: there's nothing for nothing.
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Old 12-03-2012, 10:50 PM   #3 (permalink)
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+1, a 17t countershaft sprocket will give your low-end/midrange some good grunt.

I got a nice boost in the low/mid with the TEC 2-into-1 exhaust (without the baffle). You'd probably need a remap of the EFI if you went with this, but it'd be well worth it IMHO.
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Old 12-04-2012, 12:09 AM   #4 (permalink)
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Torque!

Quote:
Originally Posted by PeteV View Post
I have a 2012 T100 Bonneville. It is a beautiful motorcycle, but I wish it had more low end torque. Can someone tell me if there are ways to do that. Remapping, new exhaust pipes? I am wondering if I would have liked the 270 engine better, such as in the scrambler. Again, I am asking for more low end torque, not just torque, so I don't think boring would be the answer. This isn't of life or death importance, I am just curious, and would like to know what others think. Thanks in advance.
The answer has to be two fold.
1. How much do you want to spend
2. How much Torque do you want.

Unfortunately they are very linked.

Have no real experience with EFI but you have to get in more fuel and air and get it out smoothly.

Initially you will need to consider exhaust, re mapping fuel and maybe one of piemans ignition tricky boxs.

Then you can go cubes>. Not sure what a 1087 will really cost al set up but think that might be more than your were thinking of.
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Old 12-04-2012, 07:30 AM   #5 (permalink)
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....I am asking for more low end torque, not just torque, so I don't think boring would be the answer.

Actually, for getting low end torque that doesn't steal from the rest of the power curve, adding displacement is the only answer.

Regards,

--Rich
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Old 12-04-2012, 09:43 AM   #6 (permalink)
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Originally Posted by beemerrich View Post
....I am asking for more low end torque, not just torque, so I don't think boring would be the answer.

Actually, for getting low end torque that doesn't steal from the rest of the power curve, adding displacement is the only answer.

Regards,

--Rich
Cams would help some without trashing the top end. But there really is no replacement for displacement (aside from forced induction that is ).

And I really do love my added displacement!!
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Old 12-04-2012, 09:31 PM   #7 (permalink)
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Originally Posted by Hypurone View Post
Cams would help some without trashing the top end. But there really is no replacement for displacement (aside from forced induction that is ).

And I really do love my added displacement!!
I've had 3 different cams in my 865...the stockers, early 790 cams, and 813 cams. All were within 1 ft-lb of torque down low, but were worlds apart when it came to top end RWHP. Admittedly, all dyno runs were done with pipes tuned to make HP, not torque...so the outcome could be different given pipes tuned to capitalize on the low end differences in the camshafts.

Displacement and gearing help the most...though the latter pushes you up the rpm band quickly and may affect upper end utility.

Regards,

--Rich
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Old 12-04-2012, 09:40 PM   #8 (permalink)
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I think the 17 tooth sprocket is the best way to get that low end to come alive. These bikes were sold from 2001 thru 2003 with 17 tooth sprockets. My 03 came with 17 tooth and it was OK all the way aorund. I run the 18 tooth on my 07 and have thought about using a 17 tooth. Have sued 18 and 19 and the ibke lacks grunt for sure. I would like to see Triumph make these bikes 1000 CC with a six speed transmission.
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Old 12-04-2012, 10:12 PM   #9 (permalink)
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Quote:
Originally Posted by jimbon View Post
The cheapest and simplist way is to fit a 17 tooth front sprocket, although this will lower top speed and increase fuel consumption: there's nothing for nothing.
yes... 17 is too hot... and 19 is too cold. But the 18 tooth that comes stock (at least with the 2006) is just right!

.
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Old 12-05-2012, 12:23 AM   #10 (permalink)
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Quote:
Originally Posted by beemerrich View Post
... Admittedly, all dyno runs were done with pipes tuned to make HP, not torque...so the outcome could be different given pipes tuned to capitalize on the low end differences in the camshafts....
Rich,

Can you post an example or two of pipes tuned to capitalize on the low end differences in the camshafts versus making HP? Are there general types of exhaust systems that provide more of one or the other (i.e. 2 - 2 vs 2 - 1) or are they specific to the pipes models/makes themselves?

Thanks!
Clint


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