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Chain fence eating turbo
 
Join Date: Dec 2008
Location: Austin, TX
Posts: 7,991
Wastegate is either too small or the WG circuit has sharp bends or both.
Old 01-26-2014, 05:33 AM
  Pelican Parts Technical Article Directory    Reply With Quote #241 (permalink)
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Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 2,385
Glad that's working so well for you!
That CHRA carries a different part number because it went through their exchange program.

The WG circuit isn't optimal on most aftermarket headers, and contributes to boost creep. The wastegate's pipe should be angled downward towards the engine where it joins the headers, so the exhaust wants to flow through the wastegate pipe when the WG opens. Unfortunately, many headers have this tube perpendicular to the headers' secondary pipes, and we've even seen some where it comes off the headers angled downwards toward the back of the car -- completely wrong.
Ideal configuration:



Solutions:
- shorten the WG pipe
- cut off and re-fabricate WG pipe
- install higher flowing WG, ex: Turbosmart Hyper-Gate 45, or Tial MV-R or
- all of the above
- replace OBX headers
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Old 01-28-2014, 05:20 PM
  Pelican Parts Technical Article Directory    Reply With Quote #242 (permalink)
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