Passing emissions with no cat?
#16
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I need inspection, too Danny! I'll soon have the lindsey 3" with XR-1 and no cat...maybe I should get Lindsey's sport 3" cat. Either way keep us updated (at least the Texans out here) as to what you do to get her to pass!
-Darwin
-Darwin
#17
Burning Brakes
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My 90 BMW 535i has passed Wa state emissions with no cat. Rolling road test. Car's has a modded engine, chip, MAF conversion.
I think the key is a good tune and a stoich mixture at idle and low speed throttle. As far as I know, they never check at WOT.
I think the key is a good tune and a stoich mixture at idle and low speed throttle. As far as I know, they never check at WOT.
#19
Nordschleife Master
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My smog is coming up in october, I think. I bought the car last year a week after it was smogged so I may have to do it this year. If I do, I'm going to have a shop install a SFR or lindsey exhaust with removable cat and sell my bursh testpipe.
#20
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Originally Posted by Mike1982
Dan P. why don't you get collector plates like I have?? It is an extra $5 a year for tags but no e-check. I would check it out, very easy to do, mail in the form you get from license place. All you have to just prove you have another car you use a primary car.
#21
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Someone mentioned reducing the timing.. this can be done with most aftermarket chips as well as stock chips, correct? using the gas quality selector on the DME? How exactly does this help me with emissions though? (I really don't know)
#22
Three Wheelin'
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What do you guys plan to do about NoX? You can lean out the mixture as much as you please, if your state is sniffing for NoX... YOU WILL NOT PASS WITHOUT A CAT.
#23
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Originally Posted by lee101315
What do you guys plan to do about NoX? You can lean out the mixture as much as you please, if your state is sniffing for NoX... YOU WILL NOT PASS WITHOUT A CAT.
#26
Three Wheelin'
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Sure, ignition timing helps. If you lower the coolant/cylinder temp, it will also go down. The point is, when a car has a defective cat ( read defective, not gutted ) NoX readings can be up to 1500ppm higher.
Adjusting the ignition timing and lowering the coolant temp would help a car that was on the borderline for NoX emissions, but it will not compensate for a test pipe.
Some states only test HC and CO, I hear about people in the midwest claiming to pass emissions with no cat. I dont hear anyone from NJ or CA claiming that.
Adjusting the ignition timing and lowering the coolant temp would help a car that was on the borderline for NoX emissions, but it will not compensate for a test pipe.
Some states only test HC and CO, I hear about people in the midwest claiming to pass emissions with no cat. I dont hear anyone from NJ or CA claiming that.
#28
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In CA we have a visual inspection as well where they (should) look for the presence of a CAT.
But what is the talk about “leaning out”. The Motronic should be in closed loop mode under testing and therefore automatically adjust to stoichiometric AFR.
Laust
But what is the talk about “leaning out”. The Motronic should be in closed loop mode under testing and therefore automatically adjust to stoichiometric AFR.
Laust
#29
Three Wheelin'
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Originally Posted by Cory9584
i got by in jersey with another car that had a gutted cat. I retarded the timing to the point the car had no power at all for the test
Although anything is possible, I would like to see a 951, gutted cat, pass state inspection on the rollers. At idle, you may get away with no cat but probably not on under a load at 25- 50mph