Potential engine damage with De-CAT? - BMW S1000RR Forums: BMW Sportbike Forum
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post #1 of 36 (permalink) Old 10-08-2019, 01:23 PM Thread Starter
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Potential engine damage with De-CAT?

Hi guys! Just replaced the CAT with Danmoto link pipe and I also have a short slip-on (SC Project) while keeping the stock headers. Engine runs fine except weird timing just at idle. Once I twist the throttle, is smooth as silk. Question: I'm worried of potential engine damage long term if I don't use a fuel/air manager like the PCV, although as it is I would rather keep the current setting. Anybody better informed on potential engine damage with this setup? Thanks for well-informed (not guessing) answers.
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post #2 of 36 (permalink) Old 10-08-2019, 04:05 PM
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I would never do that to an exhaust system so sorry I can't help you.
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post #3 of 36 (permalink) Old 10-08-2019, 08:45 PM Thread Starter
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I would never do that to an exhaust system so sorry I can't help you.
Could you kindly elaborate? The weight savings, louder engine rumble and freer-breathing acceleration makes it a worth modification in my view. Besides, many people do it, including replacing the entire exhaust system, with no drama that I can recall. The only concern is a lean mix down low may create some engine issue, or so I hear. Thanks for your views.
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post #4 of 36 (permalink) Old 10-08-2019, 08:52 PM
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friend of mine did the same on a new bike (not a BMW). Decat, new exhaust, no tune.

5-6 months later its in the shop sounding like a bucket of rusty bolts in the back of a pickup truck.

You're gonna spend a lot on a new zorst, spend the extra and get a tune as well. Its either cry now ($$), laugh later, or laugh now and cry later ($$$$)

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post #5 of 36 (permalink) Old 10-08-2019, 10:01 PM Thread Starter
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friend of mine did the same on a new bike (not a BMW). Decat, new exhaust, no tune.

5-6 months later its in the shop sounding like a bucket of rusty bolts in the back of a pickup truck.

You're gonna spend a lot on a new zorst, spend the extra and get a tune as well. Its either cry now ($$), laugh later, or laugh now and cry later ($$$$)
I see. Question: Would it be enough to get, say, a PCV and download the closest configuration map while skipping the dyno session? I am nowhere near a bike dyno shop. Thanks for the heads-up.
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post #6 of 36 (permalink) Old 10-08-2019, 10:10 PM
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I see. Question: Would it be enough to get, say, a PCV and download the closest configuration map while skipping the dyno session? I am nowhere near a bike dyno shop. Thanks for the heads-up.
I'm not sure about PC tunes to be honest, I'm sure someone else here knows more about it.

I would be looking at a handheld tune device with pre-loaded flashes. There's a few companies around that do this. Benefit is you can flash back to stock any time (like if taking it to the dealer if its still under warranty)

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post #7 of 36 (permalink) Old 10-08-2019, 10:21 PM
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Originally Posted by Firebladder View Post
Hi guys! Just replaced the CAT with Danmoto link pipe and I also have a short slip-on (SC Project) while keeping the stock headers. Engine runs fine except weird timing just at idle. Once I twist the throttle, is smooth as silk. Question: I'm worried of potential engine damage long term if I don't use a fuel/air manager like the PCV, although as it is I would rather keep the current setting. Anybody better informed on potential engine damage with this setup? Thanks for well-informed (not guessing) answers.
All these posts might be irrelevant. What year and model?
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post #8 of 36 (permalink) Old 10-08-2019, 10:29 PM
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I just talked to a couple of dealerships about K67 availability, and warranty the other day. BMW approves of having a full system, no flash/tune, as long o2 sensors are used on full exhaust to keep warranty.

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post #9 of 36 (permalink) Old 10-08-2019, 10:50 PM Thread Starter
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All these posts might be irrelevant. What year and model?
2012 BMW S1000RR, with around 8 K miles.
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post #10 of 36 (permalink) Old 10-08-2019, 10:52 PM Thread Starter
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I just talked to a couple of dealerships about K67 availability, and warranty the other day. BMW approves of having a full system, no flash/tune, as long o2 sensors are used on full exhaust to keep warranty.
Mine still has the O2 sensors connected. In addition, it still has the butterfly valves on the original headers.
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