Quote Originally Posted by roverrescue View Post
John,
Ive heard of the high flowing - what is it that they do?
And any ideas on a good place that may do such a thing and rough cost estimate if you have it?

I have a spare turbo/manifold... so time wouldnt be an issue.

Steve
Further to what Blknight has said:

The compressor impeller can be changed.

Where the air/gas enters the impeller is called the inducer (outside diameter for the turbine). Where the air/gas exits the impeller is called the exducer (outside diameter for the compressor).

The ratio of the inducer area to exducer area, expressed as a percentage is known as the trim, i.e. trim = [inducer^2 / exducer^2] x 100

For the compressor, increasing the exducer diameter makes for large increases in flow. Increasing the trim (larger inducer for same exducer) makes for smaller increases in flow.

The same series size of turbo has a range of impellers with different size exducer and inducer for a wide range of flow rates.

While increasing the compressor exducer might be too large an increase for the turbine to drive it, the flow can be increased by using a larger trim. The compressor housing would need to have the inlet diameter machined (straight forward modification) to suit the larger inducer.