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  #1  
Old October 29th, 2009, 01:17 PM
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Stephan Laputka
1995 D-90 SW
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Exhaust backpressure

I was thinking about removing my cat with a custom made midpipe. Has anyone tried this? I know some motors actually loose HP when you reduce backpressure but I'm not sure on the LR motor.

Thoughts?

Ideally, I want to dyno the truck with and without the pipe for curiosity sake.
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  #2  
Old November 2nd, 2009, 10:21 AM
ajh
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Andrew J. Hutton
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Motors do not lose power with less backpressure unless you're talking about a 2-stroke, but... it really depends on the fueling map and how adaptive it is. On the newest ones apparently they self-adapt fairly well but on the older ones you will likely need to re-map the ECU to see any real advantage but this is more generic information than you probably need. I would not expect any negative effects though.
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Old November 2nd, 2009, 11:30 AM
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Kevin Buckley
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How are you going to inspect a cat-less truck in the NYC area?
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  #4  
Old November 2nd, 2009, 12:44 PM
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Andrew J. Hutton
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Yeah, rather than de-catting you might want to just punch out all the clogged catalyst or even better fit a magnaflow cat.
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