Muffler of Choice?

[matthewt]

How much research you think goes into a Neptune? Not bagging them or anything coz they're inexpensive. Just not what I'd call a performance muffler.

My mv f4 gained dynoed 10hp higher with a set of neptunes. The usual for F4's is 5-6hp for arrows/blue flame/ferracci etc

[Zed]

Zed What about a Two brothers racing pipe. Developed specially for Hondas and amazing build quality. I have a Titanium one on the Gixxer and it sounds hot!

It also smothed out the tingly vibration through the midrange and gave it some in the bottom end.

You'd be suprised at the price too!

Yeah I checked the TwoBros pipe out on your machine last Friday...the yellow badge really suits your pretty Alstare paintjob!

[wkid_one]

I have to agree - all the 2Bros I have seen have looked like crap. Haven't seen much of their high end stuff tho. We are soo limited here with pipe choice it isn't funny. Jump on the American/UK Sites and they have some stellar pipes....check these out....(mainly R1's tho - but you get the idea!)




And My FAV!!!!

[pete376403]

My mv f4 gained dynoed 10hp higher with a set of neptunes. The usual for F4's is 5-6hp for arrows/blue flame/ferracci etc

Unless all these systems were tested using the same dyno, wouldn't that 4 - 5 HP difference be about the margin of error between different dynos, different bike, different operators, different temperature/humidity/altitude, etc. Was your increase verified with a before and after dyno run?

[LB]

My mv f4 gained dynoed 10hp higher with a set of neptunes. The usual for F4's is 5-6hp for arrows/blue flame/ferracci etc

My 800 is quoted at 73hp standard. When I had my Neptunes fitted it was dynoed at 84.1. I didn't have it dynoed standard on the same dyno, so there could well be margin for error, but I'm pretty happy with the result, and I can definitely feel that it breathes easier - plus it sounds and looks great. the sound is the main reason I get aftermarket pipes.

[Zed]

My 800 is quoted at 73hp standard. When I had my Neptunes fitted it was dynoed at 84.1. I didn't have it dynoed standard on the same dyno, so there could well be margin for error, but I'm pretty happy with the result, and I can definitely feel that it breathes easier - plus it sounds and looks great. the sound is the main reason I get aftermarket pipes.

This will be the 1st aftermarket pipe I've purchased, in fact every bike I've owned (7) has had a standard pipe on. So, the main reason I get aftermarket pipes is because in this case I can! I'm looking forward to the change in looks, sound, and performance, especially with a filter & carb kit added. Then I'll be able to come back and give a more personal reason why I would buy one.

[vifferman]

This will be the 1st aftermarket pipe I've purchased, in fact every bike I've owned (7) has had a standard pipe on. So, the main reason I get aftermarket pipes is because in this case I can! I'm looking forward to the change in looks, sound, and performance, especially with a filter & carb kit added. Then I'll be able to come back and give a more personal reason why I would buy one.

Good for you, Zed! I'd do the same in your position.
Hey - just a thought; are you committed to the K&N and Dynojet kit? The reason I ask is that there are other options out there, and for some bikes (like the VTR) the K&N is the worst option for an airfilter, as is the Dynojet ket. Have you done some Interweb research on fettling CBRs with these?

'Everyone' seems to go for the K&N hype, but it's not always all good. Most VTR owners who've fitted K&Ns have found that it mucks up the good job Honda did with blueprinting the VTR airbox (it has a baffle to tune the airflow, which the K&N doesn't), and it runs so lean that jetting is a mission, even using specs others have used. Also, Dynojet quality isn't always good: their needles aren't as well machined as stock, and you have to drill the carb slides. Factory Titanium jets are generally preferred for the VTR. I've read many posts of guys who've K&Ned their VTRs and can't get them running OK, and the usual response is "Take it out, put the stocker back in, and fit some Factory jets." Even those who do successfully install the K&N don't reap any significant horsepower gains, despite spending much time and money getting the jetting right.

My VTR is supposedly Dynojetted, and apart from a lean surge(?) on constant throttle, it runs well. However, I have doubts as to whether it really has been jetted, as the needles look like the stock ones (albeit now shimmed by me). I'm running a Unifilter (custom made), as this worked well on my VFR, and is much cheaper than either stock or K&N, didn't make a huge difference to jetting, and is rewashable.

[Zed]

Good for you, Zed! I'd do the same in your position.
Hey - just a thought; are you committed to the K&N and Dynojet kit? The reason I ask is that there are other options out there, and for some bikes (like the VTR) the K&N is the worst option for an airfilter, as is the Dynojet ket. Have you done some Interweb research on fettling CBRs with these?

There is debate on whether certain mods gain extra performance or just make things worse. It seems that there are more positive than negative comments made by the CBR owners I have read, so I'll take the plunge and if I discover no/worse results then I'll just reverse the work done. Good opportunity to accelerate my technical knowledge on the subject. I am a bit of a novice in this area and advice from those "in the know" I do value, thanks.

[wkid_one]

Good for you, Zed! I'd do the same in your position.
Hey - just a thought; are you committed to the K&N and Dynojet kit? The reason I ask is that there are other options out there, and for some bikes (like the VTR) the K&N is the worst option for an airfilter, as is the Dynojet ket. Have you done some Interweb research on fettling CBRs with these?

'Everyone' seems to go for the K&N hype, but it's not always all good. Most VTR owners who've fitted K&Ns have found that it mucks up the good job Honda did with blueprinting the VTR airbox (it has a baffle to tune the airflow, which the K&N doesn't), and it runs so lean that jetting is a mission, even using specs others have used. Also, Dynojet quality isn't always good: their needles aren't as well machined as stock, and you have to drill the carb slides. Factory Titanium jets are generally preferred for the VTR. I've read many posts of guys who've K&Ned their VTRs and can't get them running OK, and the usual response is "Take it out, put the stocker back in, and fit some Factory jets." Even those who do successfully install the K&N don't reap any significant horsepower gains, despite spending much time and money getting the jetting right.

My VTR is supposedly Dynojetted, and apart from a lean surge(?) on constant throttle, it runs well. However, I have doubts as to whether it really has been jetted, as the needles look like the stock ones (albeit now shimmed by me). I'm running a Unifilter (custom made), as this worked well on my VFR, and is much cheaper than either stock or K&N, didn't make a huge difference to jetting, and is rewashable.

Mate - best option with the VTR is to get the next size up in jets - which stops any detonation & pinging (VTR's tend to run a tad lean)....wouldn't bother with titanium jets - no real value.

Regarding the airfilter - again the best thing you can do is strip the stock filter back to the frame and replace the standard filter with a foam replacement (K&N foam is fine) and put it back in.

Did it with mine - worked a treat. Then put a 8mm spacer in the rear, race tech front end internals with gold valves and the bike bike handles much better to match the (slight) performance increase~

I agree with FS tho - given you are doing the whole intake and exhaust - you will need to spend some money on some decent dyno time to make sure you make the most of the money you have spent on the bits - as you will need to remap the engine to suit the new breathing characteristics of the bike - otherwise making the changes can be more detrimental than advantageous.

Remember the manu did R&D on the bike based on the way it comes out of the factory - putting new pipes and intake system on the bike without doing the remapping is pointless - no different than cars.

Shit -brings me back to what a bitch remapping the VR4 was when I did that up. They also have an Airflow Meter tucked in behind the filter which can make things extremely bloody tricky!

Zed - one question to ask yourself is: Is it worth getting the jet/filter and pipe kit - or do you just replace the pipe and offset the difference against your excess - as in all honestly - you are hardly going to notice the extra 2-3hp the filter and jet kit will give you

[Zed]

...Zed - one question to ask yourself is: Is it worth getting the jet/filter and pipe kit - or do you just replace the pipe and offset the difference against your excess - as in all honestly - you are hardly going to notice the extra 2-3hp the filter and jet kit will give you

Appreciate your thoughts. I'm still going with the can, filter, and carb kit...will let you know the results once done.

[vifferman]

Mate - best option with the VTR is to get the next size up in jets - which stops any detonation & pinging (VTR's tend to run a tad lean)....wouldn't bother with titanium jets - no real value.

Regarding the airfilter - again the best thing you can do is strip the stock filter back to the frame and replace the standard filter with a foam replacement (K&N foam is fine) and put it back in.

Wkid - you need to learn to read more betterer!
My VTR has a custom Unifilter - I stripped the stock filter back to the frame and replaced the standard filter with a foam replacement (Unifilter foam is fine) and put it back in. Also, the TPS has been adjusted to 430 ohms at idle, as per recommendations (not the 630 it came with). I think the lean surge / misfire at idle is either crap in the carbs (found a lot on the filter) or it's slightly lean on the front carb (fixable by a shim or two under the needle).

[wkid_one]

Wkid - you need to learn to read more betterer!

Yeah sorry I am not pyshic to read between the lines and understand 'custom' means stripped back to the frame and replaced with after market foam - my bad!!
Try being more explicit next time yeah?

I went up the next size in jets and killed most of my problems with stutter and mis-firing at mixed throttles, did use a tad more gas tho - which on a VTR is not a great thing.....went to dual spark colder plugs too - which seemed to help.

Good on you Zed.....hope it is money well spent.

No doubt I will see you on the road/track in Auckland next time I am up to the track towards the end of the year.

[matthewt]

Unless all these systems were tested using the same dyno, wouldn't that 4 - 5 HP difference be about the margin of error between different dynos, different bike, different operators, different temperature/humidity/altitude, etc. Was your increase verified with a before and after dyno run?

In my case they were done on the exact same dyno, 110.0 before and 120.1 after. No other mods were made.

[Zed]

Good on you Zed.....hope it is money well spent.

No doubt I will see you on the road/track in Auckland next time I am up to the track towards the end of the year.

Brent put the pipe on today. I'm going in to collect my old pipe on Sat and will start the bike up to see how it sounds...varooooooooom! Will post a pic then of the new look scorpion.

[gav]

Heard of a Wileyco exhaust? Bought a carbon slip on for my 97 CBR600 off ebay. Bit loud but seems well enough made, built in Italy.
Check the website
http://www.wileyco-racing.com/Inglese/Main.asp
Came in box with bracket, pipe to main collector box, tee shirt. cap and stickers etc about $180US + $30 US air freight, arrived within a week.