Triumph Bobber Forum banner

1 - 20 of 21 Posts

·
Registered
Joined
·
678 Posts
Discussion Starter #1
This may be a dumb question but why can't the cat be replaced with a pair of headers that run into more normal silencers?
 

·
Premium Member
Joined
·
1,689 Posts
Apparently the way the motor is mapped and setup, it actually requires the cat or Xpipe or it will lose a significant amounts but of torque.
 

·
Registered
Joined
·
370 Posts
I have a set of pipes like that to go on but haven't had the chance to put them on. I'll let you know about the torque afterward.

I don't see how you'd lose much as the x-pipe versus the straights well are pretty much the same thing. I've spoken to several people about it and they told me the amount of torque loss on an engine that size is negligible. They say you won't even notice the difference.


Sent from my iPhone using Tapatalk
 

·
Premium Member
Joined
·
1,689 Posts
I have a set of pipes like that to go on but haven't had the chance to put them on. I'll let you know about the torque afterward.

I don't see how you'd lose much as the x-pipe versus the straights well are pretty much the same thing. I've spoken to several people about it and they told me the amount of torque loss on an engine that size is negligible. They say you won't even notice the difference.


Sent from my iPhone using Tapatalk
The forum eagerly awaits your report on this topic! Most of us that state what I did as a repeat of what others have said.
 

·
Registered
Joined
·
845 Posts
If you get rid of the cat and don’t want an x-pipe then you’re probably going need a set of balanced headers like these for the Thruxton.
 

Attachments

·
Registered
Joined
·
62 Posts
If you get rid of the cat and don’t want an x-pipe then you’re probably going need a set of balanced headers like these for the Thruxton.
I think this is right.... as the engine probably does need some back pressure to work at optimum efficiency. I would assume this balanced system would help with that.

There are reports on this forum about those with cat deletes and high flow exhausts experiencing 'pops' and back firing. While these sound really cool, everything I've read about installing aftermarket exhausts tells me that's the sound of an engine that isn't running as well as it might. There is a limit to how much the electronics on the bike can adjust to:frown2:.
 

·
Premium Member
Joined
·
1,689 Posts
I think this is right.... as the engine probably does need some back pressure to work at optimum efficiency. I would assume this balanced system would help with that.

There are reports on this forum about those with cat deletes and high flow exhausts experiencing 'pops' and back firing. While these sound really cool, everything I've read about installing aftermarket exhausts tells me that's the sound of an engine that isn't running as well as it might. There is a limit to how much the electronics on the bike can adjust to:frown2:.
I do get some blubbing and pops, as RPMs come down, but have not experienced full on back fires. (TEC Xpipe and stock mufflers)
 

·
Registered
Joined
·
140 Posts
After I put on my Zard's w/o the silencer, I got a little popping on decel. That has completely disappeared, so the ECM has adjusted. Today I am having the TEC x-pipe installed. Have been told by one dealer that running it at 40-60 mph for 12-15 minutes speeds the process of the computer relearning, and that our ECM should be able to handle the adjustment. So I will report back, but my season is getting short, so we'll see how the computer adapts in the next 200 miles or so.
 

·
Registered
Joined
·
370 Posts
I've experienced some of that now with the stock pipes haha.

But the set I got is just like that just little different look design wise. They are mass moto 2 to 2 hot rod pipes


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
678 Posts
Discussion Starter #13
Apparently the way the motor is mapped and setup, it actually requires the cat or Xpipe or it will lose a significant amounts but of torque.
That's the answer that I have been getting from manufacturers but I can't figure how a bend can make too much difference. Maybe a little back pressure but isn't what two strokes require.
Call me cynical but I think I that would be my response to a customer if I had invested money in producing an 'x' pipe. :wink2:
 

·
Premium Member
Joined
·
1,689 Posts
That's the answer that I have been getting from manufacturers but I can't figure how a bend can make too much difference. Maybe a little back pressure but isn't what two strokes require.
Call me cynical but I think I that would be my response to a customer if I had invested money in producing an 'x' pipe. :wink2:
I think it is more about the shared back pressure - each side connecting in some manner. cat, xpipe, harmonization pipe.
 

·
Registered
Joined
·
62 Posts
I do get some blubbing and pops, as RPMs come down, but have not experienced full on back fires. (TEC Xpipe and stock mufflers)
The reports so far...as few as there have been, and as faulty as they may be...seem to show the bike work easily adjusts to cat deletes and typical mufflers. It's reportedly when you delete the cat and run a straight pipe that you start to hear signs of engine inefficiency. How much inefficiency is unkonwn as no one, as far as I know, has tested any of this on a dyno with our Bobber engine. Until that happens, this is all somewhat internet legend material.
 

·
Registered
Joined
·
608 Posts
I'm running the BC shotguns (no baffle, just straight thru) and getting a lot of crap spattered on the wall at work, far more than the tiger deposited in 2 years with a straight-thru, in just 5 weeks, starting to get a little concerned to be honest.
 

·
Registered
Joined
·
140 Posts
well, the zard'S AND TEC X pipe play quite nicely together. deeper tone, only a bit louder, and the carryover is impressive. no popping, even on agressive decel. I am more than pleased; I am ecstatic. led lights next, and maybe forward controls. oh, and the fox shock is a great improvement over stock.
 
1 - 20 of 21 Posts
Top