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Discussion Starter #1
Hi All,
Slowly getting out of my winter riding hibernation (probably still have 2 months left but starting to get the itch....) I must have a couple bucks burning a hole in my pocket - I'm wanting to do a few upgrades before riding season.

Either new pipes or new t-bar / front fender / front pulley is what I'm thinking. Currently I have a powerpro processor and a BAK, with debaffled pipes. I've seen the results of 57 HP on the dyno with the big 3 (up from 43 stock).

Has anyone ran a dyno with processor + intake + debaffle. I am curious to see how much restriction there is on debaffled pipes (I'd imagine its only through the catalytic converter?) vs aftermarket.

Thanks everyone!
KB
 

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Would think it depends on what you change to. Racnray, I think it was, replaced his stock mufflers with aftermarket and saw very little difference with one set, but a bigger improvement with the another. The following link could be of interest even though its for the 1700s, shows kinda how one change can effect your bike and other changes.
http://www.vulcanforums.com/forums/showthread.php?t=16851&highlight=dyno
 

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Discussion Starter #3
Thanks rick, that was a good read. I guess I just need to figure out if a baffled aftermarket exhaust will allow more air flow than stock debaffled. Anyone had any luck with slip on exhaust?


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Hi , just joined and looking at replacing OEM pipes on my VN 900c. I get conflicting advice as to whether I need to remap/tune or not. Any advice would be greatly appreciated. Cheers
 

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If you just do pipes, no "requirement" for a tuner.

If you do BOTH the pipes and the intake, then a tuner is "required".

Some say a tuner will improve any VN900. I can't speak to that.

E&OE, always use at your own risk.
 

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If you just do pipes, no "requirement" for a tuner.

If you do BOTH the pipes and the intake, then a tuner is "required".

Some say a tuner will improve any VN900. I can't speak to that.

E&OE, always use at your own risk.
I'm with shadow on this one. I just wanted to add that after riding my bike stock for a couple rides, I cant imagine how you could make the fueling any better with stock pipe and air. Its basically flawless even in the lower revs. I don't see any sense in doing anything other than leaving it stock, or going all the way to big 3 for more power. Anything in-between will add some noise but might mess up your fueling.
 

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VN 900c pipes

Thanks guys, I put a K&N air filter on last year and notice no difference. Just love the look of some new pipes. i don't need more speed and it alraedy returns nearly 60 mpg (thats uk gallons not US) so more than happy with that.

Need a bit more thought I think.

Aye
 

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Discussion Starter #8
I already have a air kit and processor, so pipes were the next thing ( ran out of funds last year so that's partially why I went with the debaffle)

I'm looking at v&h twin slash (like the sound have seen good dyno results) or road burner /hard krome large radius (really like the look, don't know as much about performance - how the exhaust comes off the top header doesn't look like it would be best for air flow??) Might have to make a second thread for this one....


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I personally thought my bike ran better with the stock pipes debaffled. With an intake and processor. I put cobra pipes on I thought it felt slower/less torque.

Then I bought a 1700 and sold the intake and processor off the 900. I left the cobra exhaust on. I felt the bike ran better. So in my opinion do intake, processor, stock debaffled pipes. or just pipes. That is just my experience or opinion.
 

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I personally thought my bike ran better with the stock pipes debaffled. With an intake and processor. I put cobra pipes on I thought it felt slower/less torque.

Then I bought a 1700 and sold the intake and processor off the 900. I left the cobra exhaust on. I felt the bike ran better. So in my opinion do intake, processor, stock debaffled pipes. or just pipes. That is just my experience or opinion.


Loosing low end torque is sometimes a trade-off of gaining top end. I keep the baffle in my aftermarket exhaust on my Daytona 675 for just that reason. The lower half of the RPM's are noticeably weaker without it. Plus I hardly ever get to use that 3-5hp on the top end I gain by taking it out.
 

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^ cool to see you're in Alberta as well. Im in Calgary myself, how about you?
Loosing low end torque is sometimes a trade-off of gaining top end. I keep the baffle in my aftermarket exhaust on my Daytona 675 for just that reason. The lower half of the RPM's are noticeably weaker without it. Plus I hardly ever get to use that 3-5hp on the top end I gain by taking it out.

Lol you're running the TBR slip on aren't you? That was my same set up on my 07 675, but I took the baffle out as I hated the sound with it, and didn't notice any difference in power.

just curious as to the best set up for the vn900. I have the kurykyn hyper charger on mine, and thinking of getting the power pro and an aftermarket exhaust. Too bad I was hoping for some hard numbers in this thread. Dang. Sounds like V&H slash cuts are the best.... right now I just have the debaffled ones myself. No difference in power obviously but it sounds way better
 

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yes the numbers will be higher but the curve will be different. So your max hp and torque will be at a higher rpm. How many of us run our 900 at 6000 rpms?
 

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^ cool to see you're in Alberta as well. Im in Calgary myself, how about you?


Lol you're running the TBR slip on aren't you? That was my same set up on my 07 675, but I took the baffle out as I hated the sound with it, and didn't notice any difference in power.

just curious as to the best set up for the vn900. I have the kurykyn hyper charger on mine, and thinking of getting the power pro and an aftermarket exhaust. Too bad I was hoping for some hard numbers in this thread. Dang. Sounds like V&H slash cuts are the best.... right now I just have the debaffled ones myself. No difference in power obviously but it sounds way better
Im actually running the arrow slip on but there about the same.
 

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But would you actually be loosing torque comparing a baffled aftermarket exhaust vs a debaffled stock exhaust?
Seems to me both HP and torque should go up?

KB


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The highs get higher, but the lows sometimes get lower. Typically the first few thousand RPMs loose a ton of low end torque. Kawasaki tunes these bikes to be the best at touring, and we try to turn them into race machines that are max potential at maximum output the rest of the RPM range be dam as long as my top number is higher than yours. Its ok were not the only ones with the disease. Everyone does it on every bike. The ninja 250 forum is stewing right now trying to find an extra 3 hp.....
 
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