Neptune set up for Honda CB1000r

[nptnz]

please see and feel free to comment on the attached system

Many Thanks

[nudemetalz]

I think it looks great

[bogan]

welds on that Y collector look a bit huckory, otherwise it looks the part. The more important questions, does it sound better than stock, and does it go harder that stock?

[nptnz]

up close the welds are small and tidy but had to have section in it to take oxy sensor, sounds amazing will get feedback on performance shortly!

pretty short muffler so had to have db killer attached for wof time

[pritch]

The more important questions, does it sound better than stock, and does it go harder that stock?

An aftermarket can won't make the bike "go harder than stock". The best you can expect is a minimal horsepower gain of between one and three HP. Similar to what you'd get by simply changing from a 20/50 weight oil to a 10/40.

On a bike that makes 120 odd horses you won't be able to feel that.

Basically we buy cans because they look good or sound nice, and that's reasons enough.

[bogan]

An aftermarket can won't make the bike "go harder than stock". The best you can expect is a minimal horsepower gain of between one and three HP. Similar to what you'd get by simply changing from a 20/50 weight oil to a 10/40.

On a bike that makes 120 odd horses you won't be able to feel that.

Basically we buy cans because they look good or sound nice, and that's reasons enough.

depends on what stock is like, a lot of bikes you have to rejet when changing from a stock to aftermarket can, to cope with increased air flow which gains hp. With the new bikes the O2 sensor means you only gotta remap on huge changes (a full system for example) but some mufflers are pretty restrictive to ensure it gets past emissions regs I believe.

[pritch]

depends on what stock is like, a lot of bikes you have to rejet when changing from a stock to aftermarket can, to cope with increased air flow which gains hp. With the new bikes the O2 sensor means you only gotta remap on huge changes (a full system for example) but some mufflers are pretty restrictive to ensure it gets past emissions regs I believe.

Most bikes now have fuel injection so changing the jets isn't an option. To get the maximum benefit you need a Power Commander and a custom map. And that ain't cheap.

Aprilia and Ducati for example offer different ECUs for their chosen aftermarket systems. For some, like Triumph, there is freeware available. If you know what you're doing...

If you don't need to change the fueling I fail to see how there can be much improvement. But then I'm not a mechanic.

I mentioned somewhere else on KB recently that when BIKE dyno tested some well known aftermarket cans some of them actually made less ponies than stock.

You are right about the emissions testing. That's why some bikes (Fireblade , VFR1200) now have flaps in the muffler which open after the revs at which testing takes place.

[vifferman]

You are right about the emissions testing. That's why some bikes (Fireblade , VFR1200) now have flaps in the muffler which open after the revs at which testing takes place.

And other older bikes have flapper valves in the airbox for the same reason. The Vtec VFR800s also have the stupid Vtec system and ditched the gear-driven cams to meet Euro noise emissions testing.

[bogan]

If you don't need to change the fueling I fail to see how there can be much improvement.

The O2 (aka lambda) sensor can make minor adjustments to the ratio, and if the engine can suck through more of the mix there will be a bit of a gain, not sure what sorta gains are possible before a remap is needed, but it may be noticeable, bit hard to separate whether it just feels faster due to the better sound or whether it's actually faster though.

[Nonbeliever]

please see and feel free to comment on the attached system

looks cheap

[nptnz]

no problem!

all comes down to personel preference , when we started out back in 2000 got a lot of comments about how can you make it as good as the big companies etc, 10 years later still making lots of mufflers and selling all over the globe but in a smaller market than the big players, (and less volume of course)

but its allways good to hear feedback.

[imdying]

The O2 (aka lambda) sensor can make minor adjustments to the ratio

Only at a constant throttle cruise. It can't adjust itself at WOT to make more power. If you want more power, you need to remap.

To do what you describe you need to get either a Baazaa or PCV Autotune unit which ditches that mostly useless o2 sensor in favour of a decent wideband one. That'll adjust itself towards an AFR map, but even that is a flawed concept in some regards... 99% of people are still better off getting a proficient dyno tuner to map it.

Muffler looks pretty basic, but then some would call that subtle. Looks loud as hell though

[Moooools]

looks cheap

I don't think any Neptune muffler could look cheap.
In the photo you don't get much detail, but in person I can't imagine it looking anything less than perfect. The small details are what make it a nice piece.

Used to have one on my Sachs Madass. Looked and sounded the part for sure.

[Elysium]

Where have you guys been? Thought you guys went out of business while back as your web site no longer existed.

[nptnz]

We had a bit of a revamp of the business and refocused our direction so now we are specialising in the lower volume higher quality market ,doing mainly Motoguzzi,Aprilia,Ktm,BMW etc, not trying to compete with the masses!
Still Make stuff for most models but have to deliver what the market demands.