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Discussion Starter · #1 ·

http://www.spareshack.com/cgi-bin/browse-no-frames.cgi?session=28197816&view=item&item=exrep_pipes

It sounds like a dream come true. But my question is, how will this effect the bike with no cross over? From the picture above, I don't see any cross over at all. And as I look at other pipes, you pretty much always see one. I like the Termi Ovals for the S4R. These pipes would put a single high mount on either side of the bike. Like other Monsters. And really cleans up the single side of the bike. If this lack of a cross over works without any problems, I can see going that way for sure.
 

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It'll certainly be louder without a crossover, as it won't be sharing the mufflers. Not a severe problem, usually... ;D

It'll take some dyno exploration to see if there's a power loss without a crossover. Seems like there must be, as it's a lot easier to make the exhaust without one.
 
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Discussion Starter · #3 ·
I was thinking along the same lines. But it took all my self control to keep from buying a set last night at work. The temptation was great.
 
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Discussion Starter · #4 ·
From the photo, it looks like a 2 into 1 system. I wonder how important the crosover tube would be in a properly designed 2 into 1 system?

???
 

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Arent you guys a little nervous of drastic exhaust mods without knowing how they will effect the power curves ? Maybe I'm being too sensitive to this, but until there is a PCIII with maps available for the S4R, I'm very hesitant to go with anything except DP.
 
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Discussion Starter · #6 ·
Arent you guys a little nervous of drastic exhaust mods without knowing how they will effect the power curves ? Maybe I'm being too sensitive to this, but until there is a PCIII with maps available for the S4R, I'm very hesitant to go with anything except DP.
I am with you H. But I still want to explore the options. I am sitting in 12" of snow and have little else to do. I feel letting strati mod the pipe will do little to effect the power. Nothing my mechanic can't work out. He has his tuning secrets, and claims it can been done without the PCIII. We will see. Its going to be a long winter, Plenty of time to learn and for new options to come out.
 
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Discussion Starter · #7 ·
I had a 2-1 Sil Motor full system although I can't remember if it had a crossover. What I do know is that it really restricted my bike for the track and I had to go to a full system 2-2 to get the most power from the bike.
 

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I think you S4R guys may be in for a long wait on maps for a PCIII.

Until somebody gets an S4R over to the DynoJet guys, they can't even confirm that an S4-spec PCIII will work on the S4R.

There's a couple of us waiting for ducati.com to release the g*[email protected] parts manual for the S4R. Once they do that, it will be easy to confirm whether or not the FI hardware on the S4R is the same as the S4.

A number of us discussed (on another thread) the power deficit of the S4R compared to the ST4S. A freer-flowing exhaust on an S4R may actually liberate some power along with the sound. ;D
 
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Discussion Starter · #9 ·
From the photo, it looks like a 2 into 1 system. I wonder how important the crosover tube would be in a properly designed 2 into 1 system?

???
i think you're correct that the system pictured is a 2-into-1. it looks like the merge is under that heatshield. not to nit-pic but it wouldn't be a "cross over" on a 2-into-1.

regardless, be wary guys... 2-into-1's have an advantage of carrying less weight on the bike (woo hoo) but typically at a cost of some power compared to a 2-into-2. (or a 2-into-4-into-2).

hummungus, i wouldn't put tooooooo much faith in how "perfectly" matched DP ecu's maps are anyways. check out the dyno charts this page to see that the DP ecu that goes with the 999's kit is still far from "spot-on", and remember the 999's the "superbike" so you'd figure they'd get it right for that bike:
http://www.moto-one.com.au/performance/999perftermi.html

i think the only way to really be confident is to install either an UltimapU59, or build a map with a PCIII.
 
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Discussion Starter · #10 ·
I pln to have a custom map made which ever way I go. Working part time at the dealer has its advantages. To me it is the only way to go.
 
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Discussion Starter · #11 ·
The pipe in teh above picture means nothing to me. The pipes in place of the cat are the only thing of interest to me in that picture.
 
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Discussion Starter · #12 ·
My fellow S4R bros, anyone know who manufactures the "cat replacement" from Spareshack.com? I'd like to speak w/ them to get their take on any number of questions.

In addidtion, would any of you be able to knowledgably comment on the Termignoni slip-ons, as shown in the 2004 S4R Parts Catalogue....as far as whether their f-n chip would be basically worthless to someone who has done away with the stock cat. My understanding is that the chip/airbox/slip-on package is the only way to obtain Termis....and, the chip is designed for use w/ the cat...right?
 
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Discussion Starter · #13 ·
I spoke to my tech at Warhorse. He tends to think the cat replacement would be a bad idea. He said it should only work well if the 2 cyclinders pipes are the same length. And a crossover would be much better.
 
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Discussion Starter · #14 ·
Thanks Dennis for the feedback. I'm not familiar with "Warhorse". Do they have a Website, or could you describe/provide feedback on that?
 

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I think the cat replacement pipe would not work as well as the std system-i think this because std each cylinder has two exhausts to exit through-probably pretty much the same as a crossover system on say an S4,probably be OK with cat replacement pipe and DP`s Termi`s-But then looking at all the 916/996/998 stuff etc-theres no crossover on them either and they seem to go OK
 
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Discussion Starter · #16 ·
I think the cat replacement pipe would not work as well as the std system-i think this because std each cylinder has two exhausts to exit through-probably pretty much the same as a crossover system on say an S4,probably be OK with cat replacement pipe and DP`s Termi`s-But then looking at all the 916/996/998 stuff etc-theres no crossover on them either and they seem to go OK
Actually there is. I looked at one when I was at Warhorse. As the Spagetti bends upwards out from under the bike the two pipes are connected/crossed over. It was hard to see, but Skip at Warhorse pointed it out to me.

They have a site Ted, but not chat there.

http://www.nawarhorse.com
 
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Discussion Starter · #18 ·
I would be lying if I told you I knew 100%. But I think it equalizes the preasure and increase flow thru the pipes. As one cyclinder is blowing our it causes the a vacume on the other pipe. Making the system flow smoother. It also allows exhaust to share both mufflers amd making the system quieter. I could be way off. But I think that is fairly correct.
But if you have the cat replacement on, it looks like one cyclinder will have around 14" more pipe then the other. That will cause a difference in back preassure. But ti be honest, I am not sure if and how that will effect the motor. Or if it can betuend out. I just listen to the tech and pretent I understand. Don't get me wrong, I have a clue. But thats about it. I don't know anything about washing a bike either. But I can ride the crap out of one.
 
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Discussion Starter · #19 ·
look up a few sites on exhaust flow and pressure wave dynamics. It's a very dark sience but the general concensus is that a balance/crossover pipe is pretty much esential for maximum eficency.In short it makes the exhuast system an extraction system which you need for maximum cylinder filling.Systems without a crossover rely on pipe length for a simillar effect.The drawback however is this will only work within a fairly small RPM range .
 

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Hey thanks guys. I knew it had something to do with pressure regulation.
I would like to know (like the rest of you I'm sure) how much of a drawback the cat is. I'm sure there are some gains to be made without it. I'm going to wait for the aftermarket to fab some more full systems before I spend the $.
 
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