underseat system - ideas

[Wideboy]

is there actually one for the curvy or pointy?

toying with the idea of making a custom system but would like some ideas of routing it ect

[BanditPat]

Get aload of scaffolding pole cut it bend it and weld it then stick a can on the end of it and your sorted ;)

[Binky]

I have seen some Ixil and Renegade twin systems for a curvy.

There must be others out and about too.

Might be hard to get hold of now though. Try ebay?

[mattSV]

Gav - this is about as close as anyone got to making an underseat:-

http://farm1.static.flickr.com/22/92617529_015330070f.jpg
http://farm1.static.flickr.com/16/92615909_138748cd3b.jpg
http://farm1.static.flickr.com/11/92615908_6c35f271f9.jpg

Not sure if that helps with routing?

[Wideboy]

yeah does

what about a single?

[mattSV]

yeah does

what about a single?

Think that would look sh!te:ncool:

[BanditPat]

Think that would look sh!te:ncool:


If it was a big can right in the centre it wouldnt look to bad ;)

[DarrenSV650S]

Like a big chav dustbin exhaust

[Wideboy]

really, i though it might look good :lol:

[jimmy4237]

If you're gonna do an underseat conversion to a curvy, it's gotta have 2 exhausts on it. looks the business..One biggie in the middle looks chavvy and bad..

Proper vtwin attitude with soundtrack to match..:cool::cool:

[Wideboy]

really?

anyone able to do a photoshop thingy? im **** at that sort of thing

[squirrel_hunter]

As Binky said, Renegade and Ixil made underseat exhausts though I think the Ixil was more of a twin high level arrangement, but I'm not sure of that one. The pics Matt has is of the Renegade system.

The Renegade system is very expensive and I think they are no longer in business or they are now based in Portugal. I was unable to contact them a couple of years back when I was looking for sleeves. They are also quite a bit rare to get second hand but should go for around £250 on eBay.

As for the single underseat... it is possible but I'm not sure about on a road bike. The reason I say that is I've only ever seen them on race bikes and the exhaust can is exactly where the tail light should be. I think that may have something to do with the routing of the pipes and the suspension clearance etc. But as I don't have one and haven't tried to fit one I can't be sure. Maybe you could be the first?

[Wideboy]

well think if you had a oval can on the side it would clear the rear wheel quite easily, i wouldn't know about if you had a pillion sat on the back tho

im just brain storming at min

[Wideboy]

tell you what, tomorrow i'll gaffa tape my can under the seat and take photos lol will get a idea :p

[DarrenSV650S]

You gonna drill a hole in the number plate ?

[Wideboy]

yes

[DarrenSV650S]

git

[squirrel_hunter]

tell you what, tomorrow i'll gaffa tape my can under the seat and take photos lol will get a idea :p

Thats not as silly as it sounds. Do this and bounce the rear of the bike to see if anythings going to make friends that should never meet.

I think that some of the problem will come from the route the exhaust will need to take as it will need to center its self clearing the suspension mounting and live between the rear wheel and the swing arm.

Number plate mounting would be a secondary consideration but you may also need to modify the undertray. The more I think about this I get the feeling I've seen someone having done it. IIRC he was using either the can or some of the pipework from a CBR600RR, there was some discussion regarding can clearance when taking a pillion. I think it was an American who did it, not sure if it was completed or if it was posted here or elseware...

[fastdruid]

This is something I considered doing on my track bike but quickly came to the conclusion that it would be a *lot* of grief, dunno about the pointy but on the curvy I would have done a single silencer like the CBR600RR but that would involve major modification of the rear subframe let alone the exhaust pipe routing.

Druid

[squirrel_hunter]

Although having said that there is a SV650 Race Bike on eBay at the moment with an underseat exhaust on it. The routing is different to how I've described above, they have done it far simpler here by running the pipework on the righthand side of the bike and then routing it at the top to run under the seat.

A far simpler solution as you would be able to use much more of the standard systems routing...

[fastdruid]

Although having said that there is a SV650 Race Bike on eBay at the moment with an underseat exhaust on it. The routing is different to how I've described above, they have done it far simpler here by running the pipework on the righthand side of the bike and then routing it at the top to run under the seat.

A far simpler solution as you would be able to use much more of the standard systems routing...

This one? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120464527521

I've seen ones like that before and TBH think it looks sh*t, that pipe hanging right the way out the side then back in again just looks terrible IMO.

Druid

[Stu]

http://forums.sv650.org/showpost.php?p=1807791&postcount=15

[squirrel_hunter]

Yeah thats the one.

As a little aside it failed to sale the last time it was listed. It reached £1750 and the reserve was not met. Which is a lot of money for a race SV with little in the way of modification or extras package included.

Back on the topic at hand, the pipework is not to my taste either, but each to their own. The link pipe they have used doesn't look as if it belongs there reminds me more of the front pipe on a stock system. But going from the pics I can't see where the joins are so wouldn't like to guess on its origins.

Now thinking out loud here, if this is what you want to go for I would imagine it would be possible to fabricate something suitable from the link pipes that are sold on eBay. By cutting them before the bends you should be able to mold the turns to suit a similar routing. Not sure how pretty it would be, but its just an idea...

[Red Herring]

Of the three in the pics above, or the race bike, the last is the only one that looks remotely right. The race bike and the K5 both have the link pipe up the right hand side and it looks awful sticking out in the breeze like that, the middle one looks as if they've sussed the link pipe route but the can is to near the wheel, they needed to go up into the tail unit more, and the bottom one has been achieved by using a single sided swingarm, and that's when an under seat can starts to make sense. I think there's a huge amount of work needed to get anything close to looking as if it belongs, like the Renegade high level twin set-up does.

[noob-saibot]

Have a look at Nille's sv over at svrider. Custom pipework with twin akra side cans. Tasty tasty :smt118

[Binky]

Wideboy, i might have a twin set of Ixils for you within the month hopefully...

I will need to raise some funds soon, so probably worth me getting rid of them if i actually manage to get hold of them.

Would you be interested?

[noob-saibot]

here's nille's sv that i mentioned..

http://www.svrider.de/Homepage/Bildergalerien/16331442744a1aea2829d49.jpg

http://forum.svrider.com/photoalbum/albums/userpics/14702/normal_DSC02862_%28Large%29.JPG

[drag]

I must find out what rear end that is, and how much work went in to modifying the subframe

[Binky]

I must find out what rear end that is, and how much work went in to modifying the subframe

Pretty sure it's from a Ducati. Think it might be a 749 or 999.

Might be one of the more recent models as well though.

[Wideboy]

right well got this (ignore can length) these are taken without my undertray on

http://forums.sv650.org/picture.php?albumid=457&pictureid=3311
http://forums.sv650.org/picture.php?albumid=457&pictureid=3312
http://forums.sv650.org/picture.php?albumid=457&pictureid=3313

i don't have the wheel on at the min but where the can is gives loads of rear wheel clearance, measured it and the plate is roughly 2" bigger, now im about 15 stone and have only had the numberplate touch the rear wheel slightly when getting the bike airborne

now for the can length, IF i was to have the can like that i would have to chop the can down 60mm leaving the actual canister (packing bit) at about 220mm, that giving roughly 15mm of the canister protruding past the brake light and then about 15mm? for the outlet nozzle, i want it like this to prevent the back end sooting up. All this would require a slight bit more being taken out of the existing under-tray and i would weld up a new one out of sheet stainless (need to make another anyway).

as the the number plate ect, i could either make up a lug so the can would be held in place with the conventional strap and fixed to the rear part of the subframe where the seat cowl hooks in, or i could make up some sort of stepped bracket looking like this (imagine it curved and not square, i couldn't be arsed to do the curves :lol:) indicators would either come off the plate or alongside the can

http://forums.sv650.org/picture.php?albumid=457&pictureid=3314

either way i would have to make up a new undertray for it to be closed under the seat

[yorkie_chris]

Here is nugget of wisdom for about 15th time this week.
Tyre must not hit ANYTHING for its FULL TRAVEL. Whether you're a fat fubber on the standard shock, or 9 stone wet through with an iron bar in there.


OK, good thinking, very easy to make a new undertray from fibreglass.

Now how are you going to pipe it?

[Wideboy]

keep it slip on and make a long link pipe coming out behind the right rear-set, cut back the standard system slightly and link up

[yorkie_chris]

http://forum.svrider.com/photoalbum/albums/userpics/14702/normal_DSC02862_%28Large%29.JPG

I must find out what rear end that is, and how much work went in to modifying the subframe

MV brutal?

Make a new subframe, you know it makes sense :cool:

[yorkie_chris]

keep it slip on and make a long link pipe coming out behind the right rear-set, cut back the standard system slightly and link up

Bit of a bodgerama though.

I would bring front downpipe up through stock hole in swingarm, loop back downpipe back a fair way. Then bring it in. Whole collector under seat straight into a big bore fairly stumpy 'can.

And I would run pod filters and main jets big enough to stick a knitting needle through so battery would fit under tank :-P

[Wideboy]

Bit of a bodgerama though.

I would bring front downpipe up through stock hole in swingarm, loop back downpipe back a fair way. Then bring it in. Whole collector under seat straight into a big bore fairly stumpy 'can.

lol im not that fecking good :shock:

the can is the one thing im not sure about, its pretty loud as it is and looking at it i would have to knock another 3" off......... but i know what you answer will be :)

[yorkie_chris]

Yes :)

You could also put presilencer in part of the link pipe. Or jack subframe up so it will fit further back.

Better yet, longer shock with same stroke. Gain you clearance AND handling.

[Wideboy]

nah fark it i'll just chop that can down more

what about jetting? reckon any of this will affect it?

[yorkie_chris]

Probably won't make much odds.

[noob-saibot]

I must find out what rear end that is, and how much work went in to modifying the subframe

Tis a duc tail of some form as binky said. Iirc the subframe was custom made along with doing some crazy fancy work for a battery system that fits involving 4 or 5 tiny batteries or something:confused:

[DarrenSV650S]

here's nille's sv that i mentioned..

http://www.svrider.de/Homepage/Bildergalerien/16331442744a1aea2829d49.jpg

http://forum.svrider.com/photoalbum/albums/userpics/14702/normal_DSC02862_%28Large%29.JPG
That is so fugly :pukel:

[Wideboy]

cut the can down and stuff and here is a little temp mock up

http://forums.sv650.org/picture.php?albumid=457&pictureid=3315
http://forums.sv650.org/picture.php?albumid=457&pictureid=3316
http://forums.sv650.org/picture.php?albumid=457&pictureid=3317
http://forums.sv650.org/picture.php?albumid=457&pictureid=3318

[Wideboy]

http://forums.sv650.org/picture.php?albumid=457&pictureid=3320

[DarrenSV650S]

Can you get a pic from directly behind it. And one behind it but looking up at it a bit

[Wideboy]

well not now i can't, i've just had shower and sat down

[hovis]

looks carp, it sticks out too much

[maviczap]

That is so fugly :pukel:

+1 I'm glad I'm not the only one who doesn't like this

[Wideboy]

pah!! philistines

[maviczap]

pah!! philistines

We wern't referring to you idea, just that fugly black streetfighter with twin Akas.

I know you're bored because of you off, but don't you think you might be attempting the impossible ;)

Could be a recipie for a disaster :chef:

[Wideboy]

oh i thought you were saying its was ****e lol :p

i dont do impossible!!!!! ;)

i'll put the back wheel on tomorrow and wheel it outside to get some better pics

[yorkie_chris]

So how are you going to make link pipe? Can you weld?

[Wideboy]

i can weld, but want to keep it to a minimum so going to try and bend it out of one piece :?

[yorkie_chris]

You got access to a mandrel bender? You won't compression bend it without massive crimping and loss of flow.

[maviczap]

oh i thought you were saying its was ****e lol :p

i dont do impossible!!!!! ;)

i'll put the back wheel on tomorrow and wheel it outside to get some better pics

I think if it was possible then someone would have beat you to it by now ;)

Good luck :cheers:

[Wideboy]

You got access to a mandrel bender? You won't compression bend it without massive crimping and loss of flow.

my brother has a bender (teehee) at work

[maviczap]

You got access to a mandrel bender? You won't compression bend it without massive crimping and loss of flow.

He's a strong lad no problem ;)

[yorkie_chris]

Yes but is it a mandrel bender. Normal hydraulic bender you use for making handrails and other proletariat shoite like that will just crush the tubing and you will lose flow. Even though bend looks OK it will have reduced cross section internally and you will lose flow!

Mandrel bender uses ball internally on bend to ensure no crushing.

[Wideboy]

duno will aks him tomorrow

[Sid Squid]

I really don't think that you're appreciating what needs to be done here, even for one moment putting aside the constructional details which Chris so rightly points out are not easy, the rear end of your bike is not readily suited for the type of mod you are aiming at.
The reason that every 'underseat' exhaust, (most are nothing of the sort, they're simply very high-level cans), on an SV looks poo is simple - how to join the engine to the can.
You can wedge a can into the area under the seat and join it to the front part quite easily, but it usually results in the external link pipe/s seen in a couple of the earlier posted pics, and then there's the rear light and other electrical parts to be relocated, but the real problem is the swingarm, as you will no doubt be aware the rear header passes downwards through the swingarm alongside the shock to give a rear header roughly the same length as the front pipe. On bikes with underseat exhausts this is the area most commonly used to take the pipe up to the rear of the bike, many of which are four cylinder bikes and clearly have no rear header to complicate exhaust routing.
Of course you could remove the lot and siamese the rear header into the pipe as it goes up to the rear - but this is going to be a fairly horrid exhaust layout.
I don't wish this to be negative, if you can think of a routing that works I'll be right there with the congratulations when you wheel out the finished result, but there's a reason that there aren't many such exhaust layouts, and those that do exist aren't very nice.

[maviczap]

I think if it was possible then someone would have beat you to it by now ;)

Good luck :cheers:

Like I said

[Wideboy]

im not meaning that i would conceal the link pipe or any of the exhaust under the plastic that would be to difficult and probably melt things, it would be on the outside and visible but running up under the under-tray.

i know it sounds like a crap idea but if my brother can do the link pipe and as its only going to cost me £15? for a bit of pipe then its worth just seeing what it would turn out like :smt102

[Rai86]

Quite frankly gav, you have proven yourself before when it comes to bke mods and making things...i have total faith that this will be great. Just keep us updated with pictures :D

[Wideboy]

Quite frankly gav, you have proven yourself before when it comes to bke mods and making things...i have total faith that this will be great. Just keep us updated with pictures :D


LOL!! tar, not so bad yourself :geek:

[Rai86]

LOL!! tar, not so bad yourself :geek:

Ya see...and you think im not supportive

Just dont c0ck it up now:rolleyes:

[Wideboy]

Just dont c0ck it up now:rolleyes:

when have i ever?................ :^o

[Dangerous Dave]

For starters the Renegade exhaust system is not an underseats system, it is a high level system with the cans twisted round and pointing in-wards at the back (look at the top views of this system and you will see what I mean).

To make a decent underseat system will require either a single can and dumping you underseat storage and bringing the can out where the tail light is situated, or by cutting/modding the subframe to add more tail height (Jacking the rear suspension up won't work as it will be to extreme - won't it Jorge of Renegade! ;) )

You will have to run the link pipe up the side of the swingarm, unless you opt for a mid 90's VFR750 single sided swingarm (this one requires less work to fit). If you are running standard downpipes the first thing to remember is don't mess with anything before the 2-1 collector, otherwise you'll f**k up a perfectly good base exhaust system.

The best layout would be 2-1-2 visually, although a 2-1 would be more effective for the engine.

[hovis]

Quite frankly gav, you have proven yourself before when it comes to bke mods and making things...i have total faith that this will be great. Just keep us updated with pictures :D

:confused:

[Rai86]

:confused:

what

[Wideboy]

today I've done a little more sprayed some bits, rebuilt the can and altered the undertray abit............ but not sure i like it anymore :rolleyes: :lol:

http://photos-d.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892814332_669224332_2250787_3061127_n.jpg
http://photos-e.ak.fbcdn.net/hphotos-ak-snc1/hs250.snc1/9720_126892819332_669224332_2250788_5339729_n.jpg
http://photos-c.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892804332_669224332_2250786_5406476_n.jpg
http://photos-f.ak.fbcdn.net/hphotos-ak-snc1/hs250.snc1/9720_126892824332_669224332_2250789_7460237_n.jpg
http://photos-g.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892829332_669224332_2250790_2420285_n.jpg
http://photos-h.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892834332_669224332_2250791_5617051_n.jpg
http://photos-a.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892839332_669224332_2250792_851260_n.jpg
http://photos-b.ak.fbcdn.net/hphotos-ak-snc1/hs270.snc1/9720_126892844332_669224332_2250793_1556065_n.jpg
http://photos-c.ak.fbcdn.net/hphotos-ak-snc1/hs250.snc1/9720_126892849332_669224332_2250794_2269459_n.jpg

cant get the link pipe made until end of the month and cant do much because of my foot. I think it looks ok from the sides just from behind im not to keen :smt102

[DarrenSV650S]

Don't like it. And it looks like it's gonna melt your light

[Wideboy]

nah it wont its a good 10mm away, its metal underneath anyway, i plugged the exhaust in normally and i can say its forkin loud :smt119, baffle might have to go back in :(

[DarrenSV650S]

Baffled stubbies sound rubbish. Is there no way you could get a full length one in at a different angle

[Wideboy]

Baffled stubbies sound rubbish. Is there no way you could get a full length one in at a different angle

not without butchering the subframe and doing massive altering, yorkiechris menstioned about in-line baffle/box things to quieten it down, i'll run it as it is and see how i get along with it, it was loud before but its louder now

[fizzwheel]

When your first posted about doing this I thought "nah it'll look ****e"

But actually now I've seen it, I reckon it looks good, you've done a cracking job IMHO.

[Wideboy]

oh tar very much your fizzyness,

that's really as far as i can go it wont be done until next month, need to chuck it in the back of the van and take it to my brothers place as i want to make sure he routes the pipe correctly....... then a hugger needs to be purchased cos im not polishing all the extra pipe work

[sv-robo]

Just get a sportsbike if your that way of thinking.

[Wideboy]

well i like the RR but I'm to big for it, i can sit on them but if i was to do the sort miles on one the same i do on the sv, I'd be having problems

[sv-robo]

well i like the RR but I'm to big for it, i can sit on them but if i was to do the sort miles on one the same i do on the sv, I'd be having problems
Don't know your height/weight,but i'm 6/1 & 13+ stone & it's not too bad although can get a bit achy on the ar$e after 100+miles(plank of wood springs to mind)& if your not riding(how shall we say...spirited;))can get a bit heavy on the wrist's too,otherwise absolutely cracking bike & a whole load of fun which makes it worthwhile imo...HTH.

[noob-saibot]

I like it :) Not too common to see so extra kudo's :cool:

[Stu]

Looks good, subject to link pipe.

How you routing that? Outside the swingarm? 8-[


Once you balls up and crush the link pipe it might be baffled enough ;)

[Wideboy]

going to run it like it was a highlevel...... well sort off :lol: its had to explain

[hovis]

i think the can is the wrong shape, it needs to be oval

and i cant realy see the poit if the linkpipe is on the outside of the swingarm, it nees to be concelled

but well done for trying, x

[Wideboy]

its is oval lol

[hovis]

its is oval lol

i know

but not enough

IMO

[DarrenSV650S]

i know

but not enough

IMO
lol bs

[hovis]

lol bs

:smt017

[noob-saibot]

Just get the swing/loop of the link pipe nice and tight as possible to the swingarm and it should look ok. And maybe pull back in the can a bit so its lip is just nearly level with the light.

[noob-saibot]

Seen this sv and thought of this thread. Its one i havent seen before aswell. I know its got a ss swinger but still, relocation of brake light is something to think aboot

http://forum.svrider.com/gallery/data/500/medium/DSC03672.JPG

http://forum.svrider.com/gallery/data/500/medium/DSC03674.JPG

[G]

I like that alot :cool: