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Been looking back at old threads from years ago, and came across one that made me think about asking the question if aftermarket systems have yielded decent increases in performance (HP/Torque) that have been verified with dyno runs.
I'm assuming there is some jetting change, opening airbox/K&N with most aftermarket systems, so that is a given in terms of being part of an "aftermarket system" as I am defining it. If there are good results with aftermarket systems and no jetting change/airbox mods, more power to those bikes, and I'd be interested in hearing about that as well.
I see some posts that note decent HP/Torque gains, and others that say the XS 1100 is pretty much "all in" with the stock system, as Yamaha has tapped into all the engine has to offer right out of the box.
Personally, all the carbureted in-line 4's that I've owned (Bandit 1200, ZRX 1200), could and did show very respectable if not impressive gains in HP/Torque, and usually smoothed out the power curves as well.
When looked at in term of percentages, my 1997 Bandit 1200s gained 10% hp and 4% torque over stock with just a slip on exhaust can, a couple holes in the airbox, K&N filter, no headers, and just shimming the carb needles and adjusting the air screws. Stock was 94 hp, 70 ft/lb. With the mods listed, up to 104 hp an 73 ft/lb.
With the '01 ZRX 1200, I went from stock of 112 hp up to 130 hp (14% increase) and from 80 ft/lb to 85 ft/lb (6% increase). The ZRX has a header+slip-on exhaust can (full system), jetted and pod filters. Other systems are available that maintain the airbox with a K&N but modify the airbox and come in at similar numbers. The point there being that pod filters aren't necessarily needed to post good increases with a full system, but just getting the air into the engine is the bottom line.
Anyway, that brings me to the XS1100, and just wondering what gains can be had by going to an aftermarket system, modifying the airbox, etc and still have a nice rideable bike that isn't too but has more poke.
Part of me has been 100% dedicated to keeping my 80 SG totally stock, but I'm also to the point if there is something to gain, let's say, 10% hp and 5% torque, those are decent increases in my book. I can always and pretty easily go back to stock by just switching things back.
I'm not really wanting or needing to be convinced or persuaded to pursue one way or the other, but to re-kindle the discussion about what makes the XS into a better performer engine-wise.
In a nutshell, I'm not convinced by any means that Yamaha nailed it right out of the box with all this engine has with stock displacement, and that simple/standard mods can give the bike more of what it already has, and in good amounts as well.
Thanks for reading this long post, look forward input and discussion.
I'm assuming there is some jetting change, opening airbox/K&N with most aftermarket systems, so that is a given in terms of being part of an "aftermarket system" as I am defining it. If there are good results with aftermarket systems and no jetting change/airbox mods, more power to those bikes, and I'd be interested in hearing about that as well.
I see some posts that note decent HP/Torque gains, and others that say the XS 1100 is pretty much "all in" with the stock system, as Yamaha has tapped into all the engine has to offer right out of the box.
Personally, all the carbureted in-line 4's that I've owned (Bandit 1200, ZRX 1200), could and did show very respectable if not impressive gains in HP/Torque, and usually smoothed out the power curves as well.
When looked at in term of percentages, my 1997 Bandit 1200s gained 10% hp and 4% torque over stock with just a slip on exhaust can, a couple holes in the airbox, K&N filter, no headers, and just shimming the carb needles and adjusting the air screws. Stock was 94 hp, 70 ft/lb. With the mods listed, up to 104 hp an 73 ft/lb.
With the '01 ZRX 1200, I went from stock of 112 hp up to 130 hp (14% increase) and from 80 ft/lb to 85 ft/lb (6% increase). The ZRX has a header+slip-on exhaust can (full system), jetted and pod filters. Other systems are available that maintain the airbox with a K&N but modify the airbox and come in at similar numbers. The point there being that pod filters aren't necessarily needed to post good increases with a full system, but just getting the air into the engine is the bottom line.
Anyway, that brings me to the XS1100, and just wondering what gains can be had by going to an aftermarket system, modifying the airbox, etc and still have a nice rideable bike that isn't too but has more poke.
Part of me has been 100% dedicated to keeping my 80 SG totally stock, but I'm also to the point if there is something to gain, let's say, 10% hp and 5% torque, those are decent increases in my book. I can always and pretty easily go back to stock by just switching things back.
I'm not really wanting or needing to be convinced or persuaded to pursue one way or the other, but to re-kindle the discussion about what makes the XS into a better performer engine-wise.
In a nutshell, I'm not convinced by any means that Yamaha nailed it right out of the box with all this engine has with stock displacement, and that simple/standard mods can give the bike more of what it already has, and in good amounts as well.
Thanks for reading this long post, look forward input and discussion.
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