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Exhaust Gains
I've been looking at some replacement cans for a while now. To be honest I was all set to order the X-Racing single can system, but after nearly 2 weeks I'm still waiting for the guy to answer my questions, and they aren't difficult one either!
What I'm looking for, rather than a power increase, is weight reduction. Has anyone put their cans on the scales at all?? The original ones come in at around 8Kg, so it shouldn't be difficult to get some inprovement on that. Akrapovics I understand to save arounf 0.8Kg so the �1K price tag just isn't justifiable. I'm considering the Arrow or LeoVince twin pipe setup basically becasue of the price. I think the best solution would be the single system from OTR, but again this is expensive.... Anyone got any stats on these pipes ? I'd be happy with some increase in mid range torque, rather than HP....... :newspaper: |
Well I've just sold my Leo's, so you missed a chance there ;) Weight wise they offered little saving I felt. Having had them on my Capo I knew they were heavy silencers before ordering.
As I said to you at Dent, the Tenere seems to be a very loud single, I dont know why, it just is. Maybe with more time and inclination I'd look at making headers and staggering the join to try and change the soundwaves/pulses. I've got something in the pipeline (no pun intended) at the moment for a single silencer, will see if it comes off. When I had the Tenere on the dyno with uncorked Leos it registered 47.74 rwhp, but was running lean. The consensus was that with the stoichiometric levels addressed I could have been around 50rwhp. This ties in with previous dyno results here. Torque wasn't measured sadly, but I have my baseline for experimenting with. |
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(I did warn you :HappyRoll_ANPIUI:) |
The akro's fitted to my ten were alot lighter than the standard cans, and i know the leo's Bigb fitted were around the same weight, allthough sound alot nicer...
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They are about 7kg, you will get LOADS more bottom end grunt :glasses2: |
I have personally lifted them both independently. The OTR feels signficantly lighter, more than 1kg. In addition, straight from horses mouth, it weighs 4.2kg. Hope it helps.
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[quote=josephau;110102]The OTR feels signficantly lighter, .... it weighs 4.2kg. quote]
That's half the weight! Still nothing close to the X-Racing gain of 6Kg's though. How hard can it be to make a can that conforms to the law..... |
But, why would you like to decrease weight?
I'm not having any problems and i'm just 80kg, 1.78m. My bike is also just 25kw, so around 30hp. |
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4.2kg for the OTR I believe is with the Cat, whereas I think I read it somewhere that the X-racing is without Cat, correct? Double check with Thorsten at OTR once you are getting more interested in his. |
For lightness I think you are going to have to go for titanium, CF (not so great on singles) or Ally, and one silencer is definitely the way forward, obviously.
I'm pretty sure the second silencer on the Leo's is there for visual balance; the link to it is as a strange angle not conducive to good gas flow, and the pipe is a narrower bore than the primary link pipe. For reference, this straight through, same as the Leo's, Remus pipe weighs 1400grammes. http://i97.photobucket.com/albums/l2...ikes/remus.jpg That's a lightweight pipe. |
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I don't understand the need for lightness, if it is for off roading then within 10 minutes of ridining in mud you will have more then 10kgs of mud stuck to your bike any way. :nana:
If you want a single one so you carry make a tool tube for the other side then I can see the logic in that, but to save a few kilos in the great scheme of things is not really going to make a great difference on the bike IMHO. :clock: |
Why less weight ?
Simple. I can eat more pies. :smilies0349: |
Excluding Darren's excellent 'pies FTW' stance ;) it comes down to power to weight. The Tenere is no lightweight and despite the same claimed power as a 1985 DR600, manages to have 50kg extra slapped about it's person. That's the same as a small pillion. Anything that can be done to reduce the weight of the bike is a bonus.
It would be lovely to be able to ditch the FI, and leccy boot from it as well, but that's realistically not going to happen. Losing 5kg from the back end is definitely a bonus, how can it not be? The bike will feel more responsive, the suspension less overworked and the handling improved. Wins all round, and more pies for Darren. |
as Tom says there is a definit advantage to removing 8Kg of weight form a high point in the bike, and at the rear to.
This might go some way to explain: http://www.smokingtailpipes.com/Gallery/Drawing1.jpg I've not worked out the torque that this gives, and it's very simplistic to say the least. The stock cans are the highest heavy object on the bike, by reducing that the centre of gravty will lower. Also the turning force that is put onto the front of the bike will reduce, keeping some pressure on the rear wheel under heavy braking (and you stop better with both wheels on the ground!). Little by little..... |
I hear what you are saying, but again when I go on my travels with my bike loaded up with givi 52lt top box, tent etc over the back seat and soft luggage on the sides. You could also save alot of weight with fitting a smaller tank 1 gallon =2.72kilos, I would never go off roading on the Tenere with a full tank.
I will back off now at the risk of high jacking the thread :thumbsup::whipit: |
You are not wrong in what you say, in the scheme of things a 6Kg saving (say from the X-Racing system, if they ever respond!) isn't much.
However, I just don't make 'bling' or asthetic changes to my bikes, everything is for a reason, and improvement. Changing the pipes for something that gives an extra couple of HP isn't worth it, more torque? yes that's a move in the right direction, but if I can get the weight down too then that's a real improvement, not only power to weight, but in the goemetry too. The sound makes no difference to me at all. There are also advantages to having a single pipe end to end over twin setups - I just can't remember where I read it, or what it is, but it's down to improved torque Anyway, what I'm really interested in is what people's percieved and proven improvements are when changing the pipes, wieght, power, torque. Looks and sound aren't important to me. |
Darren, if you want me to dig out some books on exhaust design I'd be more than happy to? The silencer
can make a difference to the final power/torque output, but the header pipe design is where most gains and tuning can be had.
I realise though that it's not an 'off the shelf' thing to do, so has limited appeal, but I think it's the way to go. You may find someone local to you has the facilities to make something up to suit. |
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According to my calculations, the braking g-force is given by the formula g=9.81/tan(a) where 'a' is the afforementioned angle, and g is independent of the actual weight of the can, or its distance from the front wheel. |
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Whoooooooooooooooooooooooo, what happens if I use less front brake and more back brake would the heavier exhaust give me more grip.................... I think this is getting abit out of hand now :stirpot: :hidesbehindsofa[1]:, I am signing out of this one now :bricks: |
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What are the percieved and actual advantages of spending �400 - �1000 on a new set of pipes ? |
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The advantages are weight loss high up as others say and a snappier throttle. Whether you need it, only you can tell, but usually some bikers (including myself) are infected by the 'mod' virus and there is nothing we can do about it! |
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It will make your bank balance alot lighter :042: ****** I said I was not getting involved anymore |
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