I was thinking the same about needing a tune post exhaust installation. it tunes itself. I got it tuned anyways to fiddle with the throttle positioning.
Love the videos. I will use them as guidance for sure. Just a question, I've read in many places(from tuners too) is that the stock O2 sensor doesn't cover the whole revrange. If this is true, then with an aftermarket exhaust, specially without cat. you can run pretty lean high in the rev range and this could cause damage. What are your thoughts? Also there is a pretty big HP gain across the board if you tune it, i think Vcyclenut got the MT09 Gen3 up to 119 wheel HP with aftermarket exhaust.
Interesting that you ask that... There was someone who posted just recently on reddit about plugging 2 o2 sensor deletes into their EU gen4 and it was causing chaos as the ECU adjusted to the fake output at all points in the rev range. I've always been skeptical about the "It's only at low revs" claim. No one I've been able to find has ever put up anything to prove it. It may have been true in the early days of euro compliance but I suspect that it hasn't been true for a long time. I've certainly had the ECU throw errors about the o2 sensor output at high revs so the ECU is definitely looking for it. I would also postulate that the bikes wouldn't meet emissions if it was just for low revs. Yamaha has dropped the R1 and R6 for emissions reasons so it's something they're very conscious of. They don't want to become another volkswagon Dieselgate candidate. At the end of the day it was all just speculation... Until that post on reddit about the gen4.
@@davidb3925 makes sense. When i get my kit and start experimenting with it, i will try to check the AFR with the stock o2 in and see what's up. We could keep in touch if you want to.
Thank you for sharing
Thanks for answering my questions, buddy. As always, a very informative, honest, and clear video. Lovely work!
I was thinking the same about needing a tune post exhaust installation. it tunes itself.
I got it tuned anyways to fiddle with the throttle positioning.
Love the videos. I will use them as guidance for sure. Just a question, I've read in many places(from tuners too) is that the stock O2 sensor doesn't cover the whole revrange. If this is true, then with an aftermarket exhaust, specially without cat. you can run pretty lean high in the rev range and this could cause damage. What are your thoughts? Also there is a pretty big HP gain across the board if you tune it, i think Vcyclenut got the MT09 Gen3 up to 119 wheel HP with aftermarket exhaust.
Interesting that you ask that... There was someone who posted just recently on reddit about plugging 2 o2 sensor deletes into their EU gen4 and it was causing chaos as the ECU adjusted to the fake output at all points in the rev range.
I've always been skeptical about the "It's only at low revs" claim. No one I've been able to find has ever put up anything to prove it. It may have been true in the early days of euro compliance but I suspect that it hasn't been true for a long time.
I've certainly had the ECU throw errors about the o2 sensor output at high revs so the ECU is definitely looking for it.
I would also postulate that the bikes wouldn't meet emissions if it was just for low revs. Yamaha has dropped the R1 and R6 for emissions reasons so it's something they're very conscious of. They don't want to become another volkswagon Dieselgate candidate.
At the end of the day it was all just speculation... Until that post on reddit about the gen4.
@@davidb3925 makes sense. When i get my kit and start experimenting with it, i will try to check the AFR with the stock o2 in and see what's up. We could keep in touch if you want to.