A collector does the same thing as a balance pipe. V8's almost exclusively have dual exhausts, and often have h pipes or x pipes, because they are good for performance. That does the same thing as a collector as far as scavenging does. The difference is in the number of pipes going in vs out. The tuning is the same.



That being said, the only exhaust that doesnt use scavenging is the Mazdatrix true dual system for FC's. I had a custom true dual exhaust, and I hated it with a passion. Im much happier with my collected exhaust.



That does not apply to turbo motors. Exhaust tuning doesnt apply to turbo motors due to the nature of the turbo itself. The turbine section uses those pulses(as well as the gas flow) to drive the turbine, and in the process, the waves get broken up by the turbine blade. There is no distinct pulse after the turbo to be able to utilize scavenging. With a turbo, the less backpressure, the better. Thats as far as exhaust tuning after the turbo goes.

 

Damn, looks like my GXL lost it's integrity.. It's just a crappy ripoff now..

 

i didnt mean it that way.

 

no its licensed

 

to some extent you can look at what mazda has done, over the years they have tried just about everything you can think of. the stuff that works for their goals, either street or race they used. the stuff that didnt work they only used the once, or it didnt even make it that far.



one example of this is the race cars of 1968, with the side and p ports they were able to get 220hp out of the 10a and go endurance racing. they never used the port style again though.

 

 

So what did you mean? You have come up with a serious accusation against the work of 2 men and several thousand supporting members to provide an affordable open source EFI system. It is not licensed from bosch or 'ripped off' from bosch.

 

Ok, I just read this whole thing. What a waste of my time. For all the bitching and whining going on there is no practical info I can take with me. Does anyone have dyno proof to put up of before and after for their exausts and intakes. Exactly. Even "stupid" designs hold merit untill they have been tested in the real world. Untill I see the numbers I say to all of your postulating and theorizing.



I stull luv you guys though





Gregory

 

Dyno proof?



What percentage of dynos do you know that have a calibration procedure?



I certainly can't prove that my intake produces more HP than the stock setup, because I don't even know what car it originally came in. When I get plots for the new setup still wont help you as noone else will have a setup remotely like mine.



For 4cylinder engines I have a pile of dyno runs for different intake configuration, exhaust configurations and intake lengths all of the same dyno. These show clearly the effect that a well desiged inlet has on power over the an emissions optimised plenum as the car comes out the factory with. But it wouldn't help here.

 

You can get close on any descent dyno. Besides if its that small of a gain its not even worth discussing.



Remember science class? Nobody will take you seriously unless THEY can reproduce YOUR results.





Gregory