Ducati Monster Forum

Moto Board => Tech => Topic started by: Fruity on May 10, 2010, 12:18:44 AM

Title: 4V exhaust question.
Post by: Fruity on May 10, 2010, 12:18:44 AM
hi fellas,

i'm contemplating changing my exhaust configuration which is a 2-1-2 into a 2-1 system. how would it change my bike in terms of
i) performance
ii) sound
iii) fuel consumption

bike is a 2004 monster s4r with pc3, open airbox and current pipes are termi slipons.
i've done quite a bit of search on this forum and other forums as well but can't really find answers that explain a 4v condition. only found info on 2v. so appreciate if anyone can give some feedback.

thanks  [beer]

ken
Title: Re: 4V exhaust question.
Post by: Fruity on May 10, 2010, 02:44:53 PM
"bump"er nobody loves me   :( :( :(
Title: Re: 4V exhaust question.
Post by: Speeddog on May 10, 2010, 08:57:09 PM
I've got no FHE with them, but what I remember hearing is:

2-1 systems tend to be loud, as they don't usually have a large enough muffler.
Usually there's tuning issues with 2-1 systems that result in less power.
Title: Re: 4V exhaust question.
Post by: Fruity on May 10, 2010, 09:09:38 PM
thanks for that response speeddog.

"Usually there's tuning issues with 2-1 systems that result in less power."

as long as there's low and mid range i'm happy.

tuning issues even on the dyno? would a good tuner be able to handle that?

cheers.
Title: Re: 4V exhaust question.
Post by: Speeddog on May 11, 2010, 06:24:21 AM
A good tuner should be able to get it set up on a dyno.

If you can, get a dyno run before you change it, so you can see what you got.
Title: Re: 4V exhaust question.
Post by: Oldfisti on May 11, 2010, 10:43:41 AM
A 2 into 1 system should gain low end power due to the scavenging effect.


Yes it has a chance of being louder due to only having a single mufler.


If possible have your dyno guy tune each cyl individually. You would be surprised at the discrepancies between each map.
Title: Re: 4V exhaust question.
Post by: Fruity on May 11, 2010, 05:08:27 PM
thanks guys. really appreciate that. i'll get the dyno guy to do just that.

[beer]