clipped?

[tartay]

ok i am just wondering...what does clipped mean? i see turbos for sale that are "ported and clipped" so what does clipped refer to? thnx guys

 

[L2RTSiAWD]

The Turbine wheel is clipped 10 to 20 degrees to imporve top-end. I don't know what "Clipping" actually consists of though

 

[ChrisHKS]

you also lose a lil spoopl up time as a disadvantage

 

[HighPsi91]

When a wheel is clipped it refers to the process of grinding a little bit of the edge of the turbine wheel away. The part that is clipped off is the edge of the blades that you see when looking into the exit end of the turbine wheel.

The higher degree of clip the more blade is cut away... which will increase flow through the wheel but at the expensive of a little boost response.

 

[rubbersidedown]

Originally posted by HighPsi91
When a wheel is clipped it refers to the process of grinding a little bit of the edge of the turbine wheel away. The part that is clipped off is the edge of the blades that you see when looking into the exit end of the turbine wheel.

The higher degree of clip the more blade is cut away... which will increase flow through the wheel but at the expensive of a little boost response.

Well put but i think some people may wonder why you would want to do this if all it is going to do is increase lag. This is my theory but i believe that the clipping allows the engine to utilize a larger turbo while allowing more exhuast to flow freely past the turbine so as to create a little less back pressure and therefor less stress on the engine. So i believe its done so that its easier on the engine itself. Someone correct me on this if i'm wrong, its only speculation on my part.

--edit--
another thought just came to me.. its also probably more cost efficient to clip the wheel on a standard turbo rather than having one custom built w/ custom sized wheels.

 

[InFlames]

"Clipping
A common trick to increase the output of a turbocharger is "clipping" the turbine wheel. When the turbine wheel (on the "hot side") is clipped, the fins are cut away at a slight angle (usually between 7 and 10 degrees), thereby reducing the amount of metal that is in the path of the exhaust gasses. The reason this is done is to lower the resistance of the turbo to exhaust gasses flowing through it.

At high RPMs, clipping increases engine horsepower, since the turbo is allowing the exhaust gasses to escape more quickly (and at high RPMs, the turbo can only spin so fast). At low RPMs, clipping tends to slightly increase turbo lag, since less fin-area means that the turbocharger will take longer to get up to speed. This tradeoff is typically well worth the upper-range power gains."


That was taken directly from Extreme Motorsports