Thinking out loud . - Triumph Bobber Forum
 3Likes
Reply
 
LinkBack Thread Tools
post #1 of 13 (permalink) Old 01-14-2019, 01:55 PM Thread Starter
Senior Member
 
Mar-Vel's Avatar
 
Join Date: Mar 2018
Location: VA USA
Posts: 335
Thinking out loud .

Hey guys...Would anybody know If there would be any adverse effect on the motor If there was a 2 into 2 exhaust system that had no cat and no X pipe...Apart from the sound that Is .
Mar-Vel is online now  
post #2 of 13 (permalink) Old 01-14-2019, 02:39 PM
Super Moderator
 
Join Date: Mar 2017
Location: Northern Va.
Posts: 1,626
Garage
According to posts on this topic at other forums, and on this one, the thought is that this motor/tune needs the Xpipe or Cat in order to maintain torque levels.

I am no engineer, only regurgitating what I have read and have no real world experience with the topic.
Roy likes this.
muensterDeath is online now  
post #3 of 13 (permalink) Old 01-14-2019, 02:57 PM
Roy
Senior Member
 
Roy's Avatar
 
Join Date: Jun 2018
Location: Prescott Arizona
Posts: 2,029
Garage
Thanks for that.

That question had crossed my mind too. I must confess I prefer the 'old world' simplicity of straight two-into- two pipes but also would not want to cause any issues.

Cheerio,

Roy
Roy is online now  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 01-14-2019, 04:52 PM
Senior Member
 
davidrb's Avatar
 
Join Date: Sep 2018
Location: Northern Virgina, USA
Posts: 225
Good question. As a rule of thumb, small mods to intake or exhaust will make small negative changes to the tune. Large changes will make large negative effects to the tune. Everything from the shape of the airbox to the angle and number of bends in the exhaust pipes are coded into the tune. I talked to a master race tuner at a local race shop about a custom tune for the Bobber. He stated that outside of a tune box (which essentially tricks the ECU), he would have to wait for someone in the race world to "jailbreak" the ECU, which would be unlikely for quite some time.



More to the question of "adverse effects", the engine is going to either run very lean, or rich... and out of tune. The ECU probably won't be able to adjust to such radical changes properly, but that's a guess. You will likely lose HP and torque, probably not enough to substantially neuter the bike. Your pipes, if stainless steel, will most likely turn blue, then black fairly quickly due to excessive heat in the pipes.



This is the typical reaction to changes... I'm no expert on Triumph.
Roy likes this.

I've spent my fortune on wine, women, and motorcycles. The rest I wasted on everything else.
davidrb is offline  
post #5 of 13 (permalink) Old 01-14-2019, 05:24 PM
Senior Member
 
Mike J Commo's Avatar
 
Join Date: Mar 2018
Location: The Garden Of England, Kent
Posts: 1,146
Garage
I agree concerning the tune going out the window... that aside Iíd imagine it to sound utterly unrefined and quite terrible!
Mike J Commo is offline  
post #6 of 13 (permalink) Old 01-14-2019, 05:26 PM
Vendor
 
Join Date: Jul 2017
Posts: 431
We have a Thruxton R at the shop that is running the arrow straight headers and mufflers. It sounds amazing and runs pretty **** good also. Bike also has a power commander on it so able to adjust as needed.
Great Black North likes this.
AandJCycles is online now  
post #7 of 13 (permalink) Old 01-14-2019, 06:07 PM
Senior Member
 
Join Date: May 2017
Posts: 466
My TTR has arrows no balance pipe, 93 rwhp & sounds good.
My bobber has verex headers & goldies, 110rwhp & sounds the dogs do-dahs.
As AJ says pcv to fuel spot on.
trirocket3 is offline  
post #8 of 13 (permalink) Old 01-14-2019, 06:17 PM
Member
 
Join Date: Jul 2018
Location: South Carolina, USA
Posts: 57
I am running a 2 into 1 with no cat or x-pipe. Dealer put on the Vance and Hines tune. I also did the 12-minute adaptive tune. Subsequently, I have added a booster plug. The bike ran great with the dealer and adaptive tune but it did have a lot of pops and backfires. After adding the booster plug, it has quieted these down almost completely (I actually kind of miss them!). It currently runs smooth as silk with absolutely no issues (I really was expecting some). As far as performance, it kinda feels like it has significantly more torque. It could just be the small ass seat I have on it! It could also be that it is finally broken in but it runs like a scalded dog!!
jefros is offline  
post #9 of 13 (permalink) Old 01-15-2019, 01:38 AM
Senior Member
 
Mike J Commo's Avatar
 
Join Date: Mar 2018
Location: The Garden Of England, Kent
Posts: 1,146
Garage
Quote:
Originally Posted by jefros View Post
I am running a 2 into 1 with no cat or x-pipe. Dealer put on the Vance and Hines tune. I also did the 12-minute adaptive tune. Subsequently, I have added a booster plug. The bike ran great with the dealer and adaptive tune but it did have a lot of pops and backfires. After adding the booster plug, it has quieted these down almost completely (I actually kind of miss them!). It currently runs smooth as silk with absolutely no issues (I really was expecting some). As far as performance, it kinda feels like it has significantly more torque. It could just be the small ass seat I have on it! It could also be that it is finally broken in but it runs like a scalded dog!!
It would be good to understand if it is in fact running lean or rich. I just wouldnít be happy assuming/hoping itís okay.... Iíve seen too many engine killed over time this way!
Mike J Commo is offline  
post #10 of 13 (permalink) Old 01-15-2019, 04:50 AM
Member
 
Join Date: Jul 2018
Location: South Carolina, USA
Posts: 57
Quote:
Originally Posted by Mike J Commo View Post
It would be good to understand if it is, in fact, running lean or rich. I just wouldnít be happy assuming/hoping itís okay.... Iíve seen too many engine killed over time this way!
True. It would be nice to know exactly. The engine was running a little lean prior to the booster plug. I am presuming it is running right where it needs to be currently (by the lack of signs and symptoms of a rich or lean condition - lack of misfires, smooth idle, temperature, pipes/plug condition, etc,etc). If anything it is probably running slightly richer then the factory setup (so which engine is at more risk?). I've been into motorcycles for over 25 years. I have owned and been around a lot of customized bikes but don't seem to have the same experience of engine catastrophes. Maybe I am just been lucky!
jefros is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Loud pipes saves lives JibberJabber Triumph Bobber Black General Discussion 11 11-01-2018 08:47 PM
Thinking of Exchanging My T100 for a Bobber Black, any advice & opinions? unparalleledltwin Triumph Bobber Black General Discussion 21 09-25-2018 06:56 PM
anyone know durometer ratings, i'm thinking of a seat mod atjurhs Triumph Bobber Forum General Discussion 0 11-01-2017 01:30 PM
Thinking of a Bobber....... SKinny New Members Introduction 4 08-03-2017 01:43 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome