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GrimRT
09-03-2009, 04:08 PM
I am getting sick of the exhaust stink from my truck. The cam I have is the main culprit because the duration (236/240) which requires rich fueling for good idle characteristics. So I am thinking of going to a smaller camshaft and potentially running a race catylitic converter. The cam I am looking at would be 228/210 .577/.577 on a 114. Anyone have any thoughts?

WhiteRT
09-03-2009, 04:50 PM
I am getting sick of the exhaust stink from my truck. The cam I have is the main culprit because the duration (236/240) which requires rich fueling for good idle characteristics. So I am thinking of going to a smaller camshaft and potentially running a race catylitic converter. The cam I am looking at would be 228/210 .577/.577 on a 114. Anyone have any thoughts?

If it is running really rich at idle wont it eventually kill the cats if you go that route?

Todd

mtlcafan79
09-03-2009, 04:55 PM
Less duration, less overlap, less raw fuel dumped.

GrimRT
09-03-2009, 04:58 PM
If it is running really rich at idle wont it eventually kill the cats if you go that route?

Todd

Apparently not the magnaflow race cat. I thought the same thing.

GrimRT
09-03-2009, 05:01 PM
Less duration, less overlap, less raw fuel dumped.

Yeah, that's exactly where I am going, but how much less will make a significant difference without sacrificing tons of power. I'd hate to have to experiment with this.

Hugh Jassole
09-03-2009, 06:21 PM
Yeah, that's exactly where I am going, but how much less will make a significant difference without sacrificing tons of power. I'd hate to have to experiment with this.

I'd think you'd have acceptable results with as little as 10* reduction in duration. But since you're boosted, you don't need much duration anyway. Somewhere in the 210*-220* would probably be a nice compromise and still make great power in your setup.

Five9Dak
09-04-2009, 05:12 AM
If you have side exhaust, you could switch to rear exhaust and not loose any power. :drive:

I've ran my "thunderbolt motorsports" spun billet cats pretty rich while roughing in the MS Tune and they are still in one piece and keeping my exhust from smelling.