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Old 08-13-2019, 11:54 AM   #16
rbabos
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Quote:
Originally Posted by Mr. Orange 645 View Post
I have a 2013 NRS with Akrapovic exhaust, topless, and K&N filter. Had a PowerVision Tuner on it when I bought it. I don't ride at night very often, but the other day I was traveling through town at a steady 30MPH and I looked down and my rear header right at the flange was cherry hot.

Well, I was wanting a Target Tune anyway, so I ordered one, installed it today, as well as the FuelMoto map they provided. Went for a ride, and I thought the glowing exhaust was gone (my decel pops and gurgling were gone!), but I was riding down a long city street, 2nd gear, 40MPH, 4K RPM, very light throttle to maintain speed, and my rear header started glowing again. Not nearly as bright as before, but definitely a red glow.

Ran a fairly long AutoTune session - Interstate, country highway, city stop and go, steady low speed, and tried to hit as much of the map as possible. Loaded the new tune and took another ride, 2nd gear 40MPH, 4K RPM, and still had a glow.

Did a quick AutoTune session focusing on the 4K RPM range in 2nd gear, and then loaded that new tune. Still glows, but seemed dimmer than before. I'm in the process of adding fuel to the map in the 3750 and 4000 RPM range at 7, 10, and 15% throttle position. I'll see what that does tomorrow night.

I tend to lean towards those saying it is just normal for these pipes, because it seems to happen no matter what I do.

Now my PV screen blanking out...That's another battle I'm going to fight tomorrow as well.
In reality, what choice doe the pipe have but turn red when under steady rpms. There's a flame coming out of the head, be it bluish or orange which changes how far down it turns red. Lean is closer to the head, more bluish and further down if on the rich side of yellow orange. Richer will glow a bit less as it's not a complete efficient burn but that pipe will still turn red hot in spots. Thicker stock pipes of mild steel will take more to get the effect then the thinner SS pipes on the Akro. If the engine runs nice and smooth, it's a better indicator of afr then what you see on the pipe .
Ron
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Old 08-13-2019, 11:58 AM   #17
Mr. Orange 645
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Quote:
Originally Posted by rbabos View Post
Quote:
Originally Posted by Mr. Orange 645 View Post
I have a 2013 NRS with Akrapovic exhaust, topless, and K&N filter. Had a PowerVision Tuner on it when I bought it. I don't ride at night very often, but the other day I was traveling through town at a steady 30MPH and I looked down and my rear header right at the flange was cherry hot.

Well, I was wanting a Target Tune anyway, so I ordered one, installed it today, as well as the FuelMoto map they provided. Went for a ride, and I thought the glowing exhaust was gone (my decel pops and gurgling were gone!), but I was riding down a long city street, 2nd gear, 40MPH, 4K RPM, very light throttle to maintain speed, and my rear header started glowing again. Not nearly as bright as before, but definitely a red glow.

Ran a fairly long AutoTune session - Interstate, country highway, city stop and go, steady low speed, and tried to hit as much of the map as possible. Loaded the new tune and took another ride, 2nd gear 40MPH, 4K RPM, and still had a glow.

Did a quick AutoTune session focusing on the 4K RPM range in 2nd gear, and then loaded that new tune. Still glows, but seemed dimmer than before. I'm in the process of adding fuel to the map in the 3750 and 4000 RPM range at 7, 10, and 15% throttle position. I'll see what that does tomorrow night.

I tend to lean towards those saying it is just normal for these pipes, because it seems to happen no matter what I do.

Now my PV screen blanking out...That's another battle I'm going to fight tomorrow as well.
In reality, what choice doe the pipe have but turn red when under steady rpms. There's a flame coming out of the head, be it bluish or orange which changes how far down it turns red. Lean is closer to the head, more bluish and further down if on the rich side of yellow orange. Richer will glow a bit less as it's not a complete efficient burn but that pipe will still turn red hot in spots. Thicker stock pipes of mild steel will take more to get the effect then the thinner SS pipes on the Akro. If the engine runs nice and smooth, it's a better indicator of afr then what you see on the pipe .
Ron
Makes sense. Wonder why the front header doesn't get as hot?
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Old 08-14-2019, 08:42 AM   #18
rbabos
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Originally Posted by Mr. Orange 645 View Post
Makes sense. Wonder why the front header doesn't get as hot?
Likely sees a bit more cooling air from the front.
Ron
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Old 08-14-2019, 08:52 AM   #19
Dracon
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I wonder if it couldn’t also be just a visual difference. In the daytime I can’t see either of them red, at dusk when the sun starts to go down I see the rear pipe is red before I can see the front, but when it’s already dark they both turn red at the same time. I think it’s because the rear pipe is tucked in further and your leg shields some of the light getting to it so since it is a darker space you can tell it is red before you can tell the front one is. It would be interesting to have a laser thermometer measure each when it appears your rear cylinder is glowing but the front is not.
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