Walms wrote:
The 400 is stock port... It really has no business being so quick!
Your exhaust port looks pretty square, any issues with ring snag?
As far as the diffuser cone goes, the most efficient shape is similar to a musical horn.
My software has a diffuser horn coefficient, which changes this shape based on belly dia and tuned length and pipe volume targets. Essentially there can be a wide variety of horn shapes it will produce based on this coefficient but it changes the complete shape right from the port to the belly to maximize the efficiency.
Look at it this way, the biggest difference I see from Wirges to Denco's is the diffuser shape, not tuned length or baffle cone angle. There are plenty here that will give you feedback on the performance differences between the 2... It's really a package deal.
When you got rid of that last tapered piece before the belly, I think that was a negative move... Maybe consider going back to 2 or 3 cones there, this will directly influence mid range.
No ring snag yet, but you can hear them..
You may be right about the
diffuser cone, but the differens i noted was for the better, not much tho.. Don't you get more suction (more fuel to gurgle when it returns) with a steeper 2 or 3 stage cone?
That was my theori anyway (to smoth things out), but i'm pretty new to pipes so i could be all wrong? Wery intresting subject tho, and you seem to know alot so keep it coming, i might learn something?
Btw. My nozzles arrived today, have just put them in but it's wet outside so i will report back after testride