Qjiang QJ600GS / Benelli BJ600GS - rumors thread

The remarks from ZMC888 are spot on.
With newer, EFI equipped bikes, it is a mission impossible to get better curves without running it on the dyno for several sessions.
And even then, only a slip-on will hardly do anything for increasing power.

Basically, the additional power from changing to a more open pipe is only in your mind.
The louder or deeper sound seems to make it faster, but actually it is not, just a little mind game.
We picked up a Ducati last weekend, still fitted with an original (quiet) factory exhaust.
It's output is identical to mine, but I guarantee you that riding it is not half the excitement of an open system, and hence it feels very very slow.....

That Benelli certainly deserves a more open system, but don't expect it to become stronger.
On a sidenote, adding just open pipes will not do much harm at the bike, other then that if will backfire a bit more on deceleration.
Nothing to worry about.

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Originally Posted by Nuhaus

Tomtom, why is removing the cat a bad idea? I've seen several rebel raptors with this mod and a Suzuki gz150. I thought less restriction in the exhaust flow was a good thing.

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Not sure if I said it is a bad idea, however, the cat has the function to clean the exhaust emission, and no cat means more toxic emission (see also: http://en.wikipedia.org/wiki/Catalysator), and I would name that bad, indeed.

On a side note if I had a Benelli I think I might keep it stock at least for the first few years then after that put on a more open pipe, the thinking is that the pipe is restrictive but only in the sense of bumping up the torque, however I think after a few years do a fairly reversible muffler mod, this is because stock mufflers these days must have some pretty small apertures inside the cat and baffles and spacers therefore after a few years the carbon deposits might start to restrict the bike a bit.

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Originally Posted by 998S

The louder or deeper sound seems to make it faster, but actually it is not, just a little mind game. (... The) Benelli certainly deserves a more open system, but don't expect it to become stronger.

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I agree, it will be quite difficult to get more horse power by only exchanging the pipes. But if one wants it faster, changing the sprocket would do the job surely. Downside would be lower top-speed, but on Chinese streets that should not be a major concern, I guess :mwink:
The sounds of the different replacement pipes are nice--some more, some less. However, I like the more high-pitched original sound. To me it sounds very aggressive and powerful--simply thrilling--and I find this sound fits with the sport-style design and with the mid-sized 4-zylinder-inline engine.
Contrary, a deeper sound would fit a touring bike or a big 1-zylinder bike better, just mho... Nevertheless, to judge from a video does not make much sense--live is the only feasible option.

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Originally Posted by 998S

The louder or deeper sound seems to make it faster, but actually it is not, just a little mind game.

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Had the full Termi DUC MTS1200S system installed 1 month ago (stainless / Ti system, race ECU, air-filter). Seems slightly rich, but goes like stink... Awesome sound - the way it should be and the removed CAT "bread-box" weights 6.2kg......

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Originally Posted by TB-Racing

Had the full Termi DUC MTS1200S system installed 1 month ago (stainless / Ti system, race ECU, air-filter). Seems slightly rich, but goes like stink... Awesome sound - the way it should be and the removed CAT "bread-box" weights 6.2kg......

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Guess we need a new forum "Race"--or do you talk "street" here???

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Originally Posted by 998S

And even then, only a slip-on will hardly do anything for increasing power.
Basically, the additional power from changing to a more open pipe is only in your mind.
The louder or deeper sound seems to make it faster, but actually it is not, just a little mind game.

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Agree. As some of you know a bunch of us have put the Laser cans on our JH600s.
Result: They've turned the sewing machines into motorcycles, but I am not sure if there's any real performance enhancement.
Was riding with Milton on the identical JH600 and Barry who has the older version (neither have "upgraded" the exhaust), and the 3 bikes are very similar thru the gears - noted only by riding with each other, no dyno used here as well.

It should also be pointed out that there are some people here on this form who have this issue with the color of the bike.
For instance I know a guy who thinks he obtains additional power from the the bike being BLUE, but this is only in your mind (as 998S says: it's a mind game).

There are several of us who KNOW the blue faster!
Attachment 7437Attachment 7438

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Originally Posted by TexasAggie

There are several of us who KNOW the blue faster!
Attachment 7437Attachment 7438

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Yeah! I agree, no red near by--have to be far away, still...:clap:

Went to their shop in HuJu Road (Nanjing) again and saw a batch of new bikes there. Must be the next product run. The no-brand brakes (Brembo-like ones) are branded "Benelli" now.