In another EVOMS thread there was some questioning regarding long waste gate piping and weather it works.



This little four cylinder produces over 1200 hp.

 

But just think what you'd get with shorter tubing and no lag....

 

Long wastegate tubing as pictured above does not give good wastegate priority and will reduce the efficiency of the wastegate dramatically. Using the 4 cyl. engine above is not a good example as boost pressures are likely very high to achieve those numbers. Efficient wastegate placement is not needed since it the gate is doing very little actual work.

 

Guys,

In all due respect, I do not understand your comments if you do not know the specs of the motor. Response is what you are referring to. I believe most here understand this is related to many things, intake, stroke, location of TB's, number of TB's, tune, spark energy, etc.

Has anyone thought this location or EVO's location when taken into the total design is a none issue?

 

Cj , whats that motor from?

 

Thank you for posting this Chad. The wastegate plumbing length "should" have very little impact on turbo lag. We have tested various setups and found that the bypass port location was more critical for boost regulation than anything else. Even though the port placement on our setup is not perfect in regards to flow direction, it is more efficient than porting the wastegate at the header.
<O</O
If we were to port the wastegate on the header, there is not a long enough secondary to efficiently port after the merge collector. By porting the wastegate at the collector where there is enough room, the location is not most efficient because the exhaust gasses have not merged together and there may be an imbalance in exhaust gasses from one cylinder. <O</O
<O</O

Our decision to port the wastegate at the turbocharger housing was after some tests revealed that we had more stable and better boost regulation. The length of the wastegate pipe had no measurable affect on turbo lag as compared to the wastegate mounted in the header with a short wastegate port. Our method for the location / porting of the wastegate was based on our experience and is not the “easiest” in terms of fabrication. It is much more labor intensive to machine the turbine housing and fabricate the plumbing this way than to just port the header. We feel that the benefit from this setup / process outweighs the additional labor and expense to build it this way and optimizing performance is more important in our opinion.<O</O

 

Original 320T race car.

 

I think you would know much better than most posting in here (especially with your experience in high hp 4-cyl engines). Most don't know who you are.

 

I believe I stated that a lot has to do with engine design. My point being if someone does not know the design ............ how can they critique. Their statement can or cannot be accurate, however without more information it is not a good statement as to weather or not the long piping has any real affect on a particular motor's performance.