o2 dump loosing power?
Dec 31, 2015, 11:03 AM
#1
o2 dump loosing power?
i installed a muse o2 dump and a new catch can setup at the same time...-10 fittings in valve cover etc...went for a 3rd and 4th gear pull and car hits 28 psi and just tapers down to 22...with the megan o2 housing itll hit 29 psi and hold at 25ish...i thought the o2 dump was supposed to help it with spool and holding boost? car feels slower now...its stock evo 9 turbo, cams, basic bolt ons...i did a boost leak test and everything seemed good unless i missed something...with more exhaust flow engine is more efficient i get that but is it normal for boost to just taper way down like that when it didnt do it before?
Dec 31, 2015, 11:53 AM
#3
EvoM Guru
iTrader: (1)
you need to be retuned for it...
Dec 31, 2015, 02:13 PM
#4
i thought there was no need to retune for an o2 dump...also, its holding just 22 psi to redline when it used to hold 25 ish...isnt that too much of a drop? what if i tighten the preload on the wastegate?
Last edited by nor11384; Dec 31, 2015 at 02:35 PM.
Dec 31, 2015, 03:53 PM
#5
EvoM Guru
iTrader: (1)
You drastically changed the back pressure characteristics of the exhaust system, as well as the total airflow through the engine. Hence the lowered boost. You need to get the car retuned.
Dec 31, 2015, 06:53 PM
#7
EvoM Guru
iTrader: (1)
Depends on the tuner, and if you're using an MBC or ECU boost. Also, the stock turbo really shouldn't be made to hold that much boost out the top...
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Jan 1, 2016, 10:01 AM
#15
I have a buddy that has an Evo with an O2 dump. I think I could live with the noise, its not that loud (dumps under the car, not out of the hood). But I did smell some exhaust fumes in the car. Nothing that would bother me, but I don't want my son breathing that in. Is that common with all O2 dumps?