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Discussion Starter · #1 · (Edited)
Before I beggin, i want to apologize for creating one of those regular exhaust threads which are frustrating to many people in here.

I have been searching this forum for at least 3 days, many hours a day!
I found some really helpful information.. BUT did not answer all my questions.
Yes I looked at doublen's exhaust reference thread, but didnt find the answer!
Yes I looked at tuneECU thread and didnt find the answer!

So i summarize them here, and I hope to get some answers because I am about to make an exhaust mod and I am feeling dizzy!

I bought a stock header from which I want to remove the cat and the exup.

I have 2 unanswered questions!

1) Should I leave the 02 sensor pluged and working? Yes or No, and why?
2) Is there a custom map for deleted cat & exup, with aftermarket slip on? 2008 Daytona 675 - TuneECU in my hands.
I have heard that Arrow tune is too rich and TOR tune is too lean for this set up.

I saw the great job that KEGSdale did, but looks kind of difficult for my ability. Also he made a short exhaust which probably needs different tune than long undertail.

I would really appreciate your help.

I am lost here!

Regards,
Thomas
 

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If that email has a tune with it, can I get the same email please? I asked about the same thing on another thread and no one posted anything. Thanks in advance.
 

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pm me for the tunes please.
Thanks SiW! I emailed Kaz and he hooked me up. I'm out of town for a couple weeks so I won't get to check them out until I get back home. Anyone want to do the leg work for us and convert the TB tunes into TECU tunes? P-p-p-p-p-pleease! :curtsey:
 

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I eliminated the CAT but kept the Exup. So I can't really answer your questions with certainty. I chopped the exhaust and used the GSXR muffler tip, I kept the O2 sensor, exup and am running the Arrow tune and the bike soiunds and runs AWESOME!
 

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I've been looking for an answer to one of those questions for a while too.

Pros/cons to removing/leaving 02 sensor? I've removed EXBV and SAI already, and I'm wondering if the 02 sensor is still doing anything in this situation or should I go ahead and uncheck it as well?

Thanks
 

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From my understanding, if you removed the O2 Sensor you will more than likely get a check engine light. The CAT is easy to removed without issues and the Exup is prettty easy as well but need the right tune to go in. My arrow tune disables the EXup anyways so it is open as long as the bike is running.
 

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Besides a CEL (which to my understanding I should be able to clear with TuneECU??) is there any other reason to keep it around?
I've read about it's purpose/function but does it have any use on our bikes or another hoop Triumph jumped through for emission purposes..?
 

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Discussion Starter · #12 ·
If you have a TuneECU or a TuneBoy then you can disable 02 sensor and have no engine light turned on.
From what I was told, there is no serious reason to remove the O2 sensor. You might get a very slight performance increase, but the engine will lose its ability for a slight adjustment considering the air temperature etc.

So I will just leave it pluged.

I think that IF by leaving it pluged , you get some unstable idle issues, you can just turn it off from TuneECU-boy, and check if that fixes this issue.

I do not have personal experience from all these, I ll know very soon when I do this mod. I am just telling you what I understood by reading others.
 

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Discussion Starter · #13 · (Edited)
So, I removed exup and cat today!

I changed my map from TOR to Full Arrow system.

My mechanic told me that the bike will be runing rich and that it will lose power instead of gain, if I dont make a custom map.

Do you think that my bike is now runing worse than it did before?

I really cant understand any difference yet!

I will have a comparison dyno very soon, but until i do, i hope i get some answers from you..
 

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Hard to say without actual dyno numbers. I felt like I gained power when I first loaded the Arrow map. The Full Arrow exhaust does not have a cat or exup, but I think the Arrow map was still a little too rich for just getting rid of the cat and exup.
 

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Discussion Starter · #15 ·
when i just hit some open roads, and I think that i gained power. It felt more agressive, and did 2 power wheelies!

I will have a dyno soon to check out. I was thinking though that if the arrow tune is too rich then maybe some more air intake would be fine, so I am thinking buying a BMC Race air filter to replace my K&N filter.

Also what i have noticed is that the idle while the bike is cold, is unstable and changes between 1.000 and 2.000 rpm, a few seconds at each. why...?
 

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when i just hit some open roads, and I think that i gained power. It felt more agressive, and did 2 power wheelies!

I will have a dyno soon to check out. I was thinking though that if the arrow tune is too rich then maybe some more air intake would be fine, so I am thinking buying a BMC Race air filter to replace my K&N filter.

Also what i have noticed is that the idle while the bike is cold, is unstable and changes between 1.000 and 2.000 rpm, a few seconds at each. why...?
Without an o2 sensor your bike will rely on your tune for the idle. A dyno tune should get you a nice smooth idle. I run the BMC Race filter as well, no complaints here! Can't wait to see your #'s!!!
 

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Mine was choppy when I first loaded the ARrow Tune and after a weekend of tweaking the fuel down low I have had no idle issues. Fixed that and somewhat smoothed out the flat spot around 5k.
 
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