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Raise your hand if you're just as curious as we are about what Honda is doing with three tips on the CTR mules. Well, we have a theory.
It involves sound, fury and Formula 1.
For the 2016 F1 Season the FIA is aiming to increase the volume of the V6 turbo hybrids, which is notably muted compared to the screamers of yore. As you may know turbocharged engines are significantly quieter then a naturally aspirated motor, the turbine acting as a second muffler of sorts, dampening the sound.
So for next year the FIA has decided that all cars must have one tailpipe for the turbine and 2 smaller tailpipes for the wastegate.The turbo has a similar effect on exhaust systems, where the exhaust-side impeller disrupts the exhaust flow by creating an extra gate for the sound to have to flow through. When talking about cars with exciting exhaust sounds, most people gravitate to sounds where the individual “pluses” of cylinders firing are very defined, creating an exciting burble or rhythm to the engine’s sound. Unfortunately for turbos, the turbo itself acts as a sort of “revolving door” where the air has to enter (and therefore exit) the turbo in a smoother, more consistent pattern. Much like the effect on the intake, this results in a flatter, more sinusoidal tone to the exhaust, which most people would say is less exciting than an NA engine of similar design. The turbo also tends to make the exhaust quieter as a byproduct.
“For 2016, all cars must have a separate exhaust wastegate tailpipe through which all and only wastegate exhaust gases must pass,” noted the FIA. “This measure has been undertaken to increase the noise of the cars and will not have any significant effect on power or emissions.”
This is how Honda intends to do it on their 2016 powerunit
How does this relate to the CTR?
Coming back to the K20C1 in the Type R, we see the smaller diameter pipe in the centre of the two larger, could Honda be using a similar noise boosting strategy on the 10th Gen CTR? Granted they would have to run a separate exhaust all the way back just for waste gases but it would certainly help distinguish the different mechanical sounds. For comparison, the somewhat docile sounding 2015 CTR
Most OEM turbos feature an integrated wastegate which robs us of the distinct sound and fury of fluttering waste gases that we've come to know and love. Internal wastegates simply dump excess gasses downstream into the exhaust. While other manufactures are fiddling with pumping sound into the cabin to liven up the 'experience', Honda would blow them all away with what essentially could function as an extended screamer pipe.
C'mon Honda, do something crazy!