Anyone else out there with Milltek DPs getting "Warm Up Catalyst Efficiency Below Threshold" codes
09-20-2007, 07:35 AM
#1
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Anyone else out there with Milltek DPs getting "Warm Up Catalyst Efficiency Below Threshold" codes
I used to get these codes (P0421, P0431) occasionally, typcially while driving genteely after a track event, but now I am getting them constantly for both banks. WTF?
09-20-2007, 12:21 PM
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I have a feeling if anyone has they won't post the results...
From what I've heard they don't do much, if anything at all in regards to performance.
They sound nice though ;-)
They sound nice though ;-)
09-20-2007, 03:08 PM
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Re: I have a feeling if anyone has they won't post the results...
I think the performance comes in with a Chip...not just the hardware. That being said....we will still need to see dyno numbers
09-20-2007, 03:17 PM
#7
I have and I posted them
Doesn't anyone read?
To recap, these were the dyno runs where I determined that the intake flap was not opening, and as a result the intake was starved above 4500 rpm. But below that the gains are pretty big when compared to the same day baseline and a previous run 6 months earlier at much lower temperature.<ul><li><a href="https://forums.audiworld.com/rs4b7/msgs/58454.phtml">Milltek downpipe dyno</a></li></ul>
To recap, these were the dyno runs where I determined that the intake flap was not opening, and as a result the intake was starved above 4500 rpm. But below that the gains are pretty big when compared to the same day baseline and a previous run 6 months earlier at much lower temperature.<ul><li><a href="https://forums.audiworld.com/rs4b7/msgs/58454.phtml">Milltek downpipe dyno</a></li></ul>
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09-20-2007, 03:20 PM
#8
See above. You must have missed the two times I posted them.
When I get around to putting in a switch for the intake flap, I'm going to go back down to EPL and dyno again, to show the effect of flap open and flap closed. I suspect this will open up the top end with the downpipes and catbacks.
09-20-2007, 04:05 PM
#9
Scott....your dyno plots are of DP+ cat-back. It doesn't address the issue of......
additional power gains from the downpipes over cat-back alone.
Or am I missing something???
Or am I missing something???
