High NO - Is this a cause? UPDATE - Nope.
12-06-2006, 01:24 PM
#47
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Originally Posted by worf928
Because you cannot get any load on the engine without a dyno?
I wish I had a dyno, but I can not see any way to make one pay for itself at our shop.
12-06-2006, 01:55 PM
#49
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Originally Posted by Bill Ball
OK, a used cat would be a good next move.
12-06-2006, 02:03 PM
#50
Fleet of Foot
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Originally Posted by Lizard931
a bad cat can actually be worse for emissions, you could always just gut the cats and send her through.
The midbed of the cat is what reduces NOX. EDIT: The only way I can imagine a cat worsening emissions would be if it were clogged, and that would be indicative of mixture problems. You would feel it in the performance of the engine in any case.
Last edited by Bill51sdr; 12-06-2006 at 02:44 PM.
12-06-2006, 09:55 PM
#51
Race Director
Bill
How about putting your X-pipe with the high flow cats on and testing that.....those cats should be much cleaner than the old cat anyway? Plus Dr Mike will love the extra HP so much that he'll end up buying one!
How about putting your X-pipe with the high flow cats on and testing that.....those cats should be much cleaner than the old cat anyway? Plus Dr Mike will love the extra HP so much that he'll end up buying one!
01-14-2007, 02:12 AM
#52
Under the Lift
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Mike got the car smogged. A used cat failed. So, DEVEK installed new cats and that did it. Instead of Porsche, they went aftermarket, saving a lot of money. They don't look like the Random Technology cats. They are larger, about the size of the stock cats. DEVEK did a nice job welding everything together. Mike's happy.
Brian: I missed your last suggestion. That would have been a good trial.
Brian: I missed your last suggestion. That would have been a good trial.
Last edited by Bill Ball; 01-16-2007 at 10:40 PM.
01-16-2007, 10:29 PM
#53
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Glad you got it fixed. I think new cats, even aftermarket, are the way to go. Technology has moved along since these cars were built and a modern cat. can solve many emission problems.
Mark
Mark
01-17-2007, 07:45 AM
#55
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Magnaflow-m6694008
Originally Posted by LeonT
I agree....or you could go with a cat from Magnaflow,autopartswarehouse.com carries them for the `87 TO `89 `S4 for about 80 bucks(part # M6694008) and any muffler shop should be able to install....
01-17-2007, 09:56 AM
#56
Three Wheelin'
Originally Posted by moon928
These are cheap compared to stock cats- has anyone installed these?
THey are cheap compared to the high flow cats most of the 928 vendors are spec'ing. Maybe they don't flow as well.
