|  | Topic : De-Cat |  |
| | | DVR | | Chaac |  |  | | Reg. Date | : | 12/10/2009 | | Posts | : | 651 | | Location | : | I'm Denis, from Belgium |
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| | Posted : 06 Nov 2009 - 17:52 Post title : Re: De-Cat (Re: Thatch) | | | At 5'11" ?? Don't think so 
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| | | Thatch | | Thor | |  | | Reg. Date | : | 24/06/2009 | | Posts | : | 3,655 | | Location | : | Savannah, GA, United States |
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| | Posted : 06 Nov 2009 - 17:54 Post title : Re: De-Cat (Re: DVR) | | | What are you, 2 dimensional?
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| | | DVR | | Chaac | | | | Reg. Date | : | 12/10/2009 | | Posts | : | 651 | | Location | : | I'm Denis, from Belgium |
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| | Posted : 06 Nov 2009 - 18:09 Post title : Re: De-Cat (Re: Thatch) | | | 
Maybe I have the LBS wrong then , 73kg is my weight.
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| | | Thatch | | Thor | | | | Reg. Date | : | 24/06/2009 | | Posts | : | 3,655 | | Location | : | Savannah, GA, United States |
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| | Posted : 06 Nov 2009 - 18:17 Post title : Re: De-Cat (Re: DVR) | | | Well you're not far off it's actually 161 lbs ... perhaps not 2d but lets just say you're awfully aerodynamic. :)
I've definitely got a few pounds to loose but I think sub 200 would see me hospitalized. I should probably be more around 225-230. Hopefully I can restart my workout regiment in the next few weeks , get a bit healthier and add some performance. A win win
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| | | DVR | | Chaac | | | | Reg. Date | : | 12/10/2009 | | Posts | : | 651 | | Location | : | I'm Denis, from Belgium |
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| | Posted : 06 Nov 2009 - 18:25 Post title : Re: De-Cat (Re: Thatch) | | | I agree , I lost 10kg in the last couple of months. I still want to loose some more. Ideal would be around 70kg for me.
Here I am getting ready to go, bad picture, my wife took it quick from the open window. But not 2d for sure 
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| | | mad_angler1 | | Chaac | |  | | Reg. Date | : | 18/10/2009 | | Posts | : | 511 | | Location | : | United Kingdom |
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| | Posted : 13 Apr 2010 - 21:29 Post title : Re: De-Cat (Re: mad_angler1) | | | Hay all, i know it been a while on this thread but i finally got around to making my MK2 decat last week , rather than have two single tubes into the pipes i decided to make new from scratch with a link between the two.
i ordered 2 x 45 degree bends from a company, these were mandrel bent to no crease and reduction in diameter around the bend, i then welded these together to make a U between the downpipes, next i cut a whole on the bend where the output will be to the exhausts, i cut the holes with a small hobby drill cutter, next i cut the out pipe and shaped the end to match the radius of the tube and then welded it on, did the same the other side and all done.
this has produced a better result in sound compared to the separate single tubes, the sound is nearly the same as with the cat when normal riding but louder when acceleration hard, also it has now added a really nice pop pop when idling, sounds more like a v twin definitely.
As for performance i am convinced just as before i have lost some low down torque again with the decat however this may be in my head, iven if i have i will resolve this with tuning once its available, (Come on wayne  )
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| | | Thatch | | Thor | | | | Reg. Date | : | 24/06/2009 | | Posts | : | 3,655 | | Location | : | Savannah, GA, United States |
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| | Posted : 13 Apr 2010 - 21:43 Post title : Re: De-Cat (Re: mad_angler1) | | | Are you running TORs off of this? I am beginning to think that the BC's have a fair bit more to them than the TOR pipes and as a result are providing some more back pressure that's keeping the torque up and the sound down. Every one of the CATless riders seems to say their bike is quite loud where I don't think mine is (certainly louder, but not overly so) and you've mentioned a couple times now that you lost torque were I never felt that at all (nor have the other reports on the BC pipes. That would certainly explain the different experience between the two setups.
Not really anything good or bad, just an observation of what the different setups offer. Of course there is no definition for 'loud' so...
Anywho, nice job on the crossover. I was going to give you shit when I saw the first picture alone, but then you had to go and spoil it by finishing the thing.
Enjoy
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| | | mad_angler1 | | Chaac | | | | Reg. Date | : | 18/10/2009 | | Posts | : | 511 | | Location | : | United Kingdom |
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| | Posted : 13 Apr 2010 - 22:09 Post title : Re: De-Cat (Re: Thatch) | | | yep i have the TOR which basically have no baffle, its straight thought with the outer pipe having holes in but no restriction, as for the BC i remember they saying about using a baffle when building them.
EDIT: just found it they used Bomber Exhaust baffle in the BC pipes, one thing they note is the cat was already very free flowing, i still believe other than sound there is not much restriction there, and what there is is beneficial to torque rather than restrictive
| | Post edited by mad_angler1 on 13 Apr 2010 - 22:16 |
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| | | daz | | Zeus | |  | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 13 Apr 2010 - 22:23 Post title : Re: De-Cat (Re: mad_angler1) | | | Could still be stright thru even with a baffle tho, as they may mean one of those baffles that is a perferated tube with packing between it and the outer shell. thats what my speedy's thunderbike pipes had and it was straight thru. But it's called a baffle too just as the off center chambers are. By the way mad, will you be able to do your own tuning with the tuneboy ? In other words, is there any way w/o a dyno and wideband sensors you can modify maps to tune for any mods you do as far as fueling goes? i would assume this would be like jetting in that you would try approximate values, then do a plug check and readjust as necessary? Or is that even possible? What exactly do you intend to do with the tunboy....anything more than us, which would be downloading waynes maps? I'm just curious because i assume there will be lots of variation between all the little mods we all come up with, and certainly wayne isn't going to have tunes for every single scenario. We'll probably all be looking to you for guidance ! It's good to have the likes of you in the forum !
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
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| | | mad_angler1 | | Chaac | | | | Reg. Date | : | 18/10/2009 | | Posts | : | 511 | | Location | : | United Kingdom |
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| | Posted : 13 Apr 2010 - 22:39 Post title : Re: De-Cat (Re: daz) | | |
daz wrote:
Could still be stright thru even with a baffle tho, as they may mean one of those baffles that is a perferated tube with packing between it and the outer shell. thats what my speedy's thunderbike pipes had and it was straight thru. But it's called a baffle too just as the off center chambers are. By the way mad, will you be able to do your own tuning with the tuneboy ? In other words, is there any way w/o a dyno and wideband sensors you can modify maps to tune for any mods you do as far as fueling goes? i would assume this would be like jetting in that you would try approximate values, then do a plug check and readjust as necessary? Or is that even possible? What exactly do you intend to do with the tunboy....anything more than us, which would be downloading waynes maps? I'm just curious because i assume there will be lots of variation between all the little mods we all come up with, and certainly wayne isn't going to have tunes for every single scenario. We'll probably all be looking to you for guidance ! It's good to have the likes of you in the forum ! |
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well i'm hoping wayne may have done one with cat less pipes as that should be close enough however if not i will use what ever he have come up with and go from there, i did my speedmaster with my but dyno, i added around 5% more fuel across the range ant it made a decent difference, im also going to look at his auto tune thing as that should be usable on the road as well as the dyno to do the testing, from what he said it not a permanent fit like the Dynojet version it just fitted to tune the bike, however first i need to know if the wideband sensors just go up the exhaust like a normal dyno or do they replace the stock ones untill your complete,
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| | | daz | | Zeus | | | | Reg. Date | : | 12/05/2009 | | Posts | : | 7,709 | | Location | : | United States |
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| | Posted : 14 Apr 2010 - 14:15 Post title : Re: De-Cat (Re: mad_angler1) | | | I would think if they replaced the stock ones they would be permanent. I'm envisioning a up the ass version that you'd tie to the pipe or such and would hopefully allow it to develop a tune quickly enough that you don't have to ride around long enough for anything to work itself loose. i mean, if they replace the stockers why would they have to be temp? It would see to be an advantage to leave them on. Unless maybe they're cheap ones that aren't stout enough to be permanent. I'd sure love to hear more details about this including extra cost.....Wayne?
| 2010 Blue/White Thunderbird, "Brutus". 1700 kit, short tors, gutted cat, UNI filter, filter seal off, custom tune. Brutus in his native habitat: Link
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