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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 06-14-2010, 01:37 PM   #1
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aircare opendump, safc, cat

do the inspectors only look for a cat? Will they care about my open dump tube?

Other questions:

I plan to remove my MBC and just run the waste gate spring at low boost (5psi). Should I then lean out the tune to reduce HC? I figure stock turbo cars must be 12:1 or so on boost, so how much of a problem is running "the correct" AFR on HC? Should I just tune the SAFC to "N/A" levels? Will this be safe on low boost with 94 octane mohawk?

I plan to tighen the spring on my BOV so I don't get rich on deceleration. I have the SAFC compensating now, but it still runs a little rich on decel. How much of a problem will this be?


What if I just happen to have a bunch of exhaust leaks at the mani, or DP? It will sound like ass, but will it get me though aircare?

Finally, I have a 5 year old "high flow" cat on there now. I figure there is not much catalyst left? Should I just rent a cat for the day, or will I get by with a good tune?
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Old 06-14-2010, 01:39 PM   #2
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Ps: car is 96 240sx with Ka-T running 370cc injectors, stock MAF, SAFC for tuning.
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Old 06-15-2010, 07:22 PM   #3
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They wont care. They probably wont even know what it is. I guess it depends on where the end of the dump tube sits. THat said. I was able to make it with my old set up that had open to atmosphere wastegate dump tube.
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Old 06-17-2010, 09:32 AM   #4
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hc and CO super low. Just NOx high becuase no EGR. I think if I retard my timing I should be fine. they don't care about the open dump and they don't even push the car into boost. More just FYI for other searchers.
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Old 06-17-2010, 10:45 AM   #5
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i love OBD2, no cel, and a visible cat = win
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Old 06-17-2010, 04:37 PM   #6
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sounds like you need a new CAT to reduce NOx
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Old 06-18-2010, 09:47 AM   #7
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I have a new cat. I think I should be fine once I retard timing. I will post results once I go again.
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