Depends on a couple of things, first the dyno might measure coast down, so car in neutral and the dyno measures loses, other reason would be when you see cars do a pull on the dyno then put in neutral and rev that would be to keep oil pressure up for cooling the systems
Wow, the sound keep getting higher after 8,500 RPM. Usually in some other aftermarket exhaust it does not. Does the ECU need to be remap? Or you have OBD/ canceller.
Around 3k rpm the car is suffering from “megaphonitis”, a common problem with this kind of exhaust. There is a reason motorcycles went away from this style, but I guess it’s marketable for the company given the lack of consumer knowledge about exhaust harmonics.
I used to make music when I was younger, and it's made me come to enjoy the sounds of many things. If it's okay, can you tell me how it's an issue and how it works? I don't mind if it's long, I'll read it all anyways.
@@recon1673 every exhaust has positive and negative pressure pulses flowing back in forth in the pipe. Using length and diameter of the pipe we can time the negative wave to arrive during the period when the exhaust valve is closing and intake opening (this is called the overlap period). If we get the negative pressure wave to arrive during the overlap period, the negative pulse will pull the intake charge into the cylinder at a higher pressure (up to 4-5 psi or more). This is highly beneficial for torque/volumetric efficiency because you are filling with more air than simply the negative pressure area of the piston moving down. What is important to note is that this negative wave occurs over a very narrow range of rpm, but is very effective in that range. The problem with this wave tuning is that usually there is a range where instead of a negative wave arriving during overlap, it’s a positive wave. The positive wave actually pushes exhaust back into the cylinder and is very detrimental to cylinder filling and torque. On to the megaphones. The megaphone shape can accentuate the wave tuning effects that I described above, and the dip that I described caused by the accentuated positive pressure wave may be because of the megaphone (the term that was coined for this is megaphonitis). This kind of exhaust has been touted as being better mostly from a marketing standpoint, in reality the most important thing overall is not peak torque/hp but a smooth wide curve. If you want to learn more check out the cycle world articles by Kevin Cameron where he talks about wave tuning and megaphonitis. Hope this helps.
I just checked the Dundon motorsports website and the full exhaust is $20,000 before install and the website says they’ve sold 6 in the last 16 hours. 🤯 who TF has this money? Please tell me!!
car is designed to sacrifice low end torque for high end torque and power, unsuitable for daily driving but perfect for track use since you'll never be under 5k rpm on this car