any gains from downpipe vs. o2 downpipes?
#1
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From: driving the 10 second beast in ohio or running lightmods.net
any gains from downpipe vs. o2 downpipes?
anyone have any experience? i have a bolt on (non o2) downpipe currently and am doing a turbo and other stuff shortly to my X for the next year racing season. i am curious what kinda gains if any are out there going from my current setup to a o2 downpipe. I am mainly worried because if there isn't much gains vs. a stock o2 then i want to leave my stock o2 there for maximum reliability cause the car is gonna be raced a lot.
dave
dave
#2
anyone have any experience? i have a bolt on (non o2) downpipe currently and am doing a turbo and other stuff shortly to my X for the next year racing season. i am curious what kinda gains if any are out there going from my current setup to a o2 downpipe. I am mainly worried because if there isn't much gains vs. a stock o2 then i want to leave my stock o2 there for maximum reliability cause the car is gonna be raced a lot.
dave
dave
#4
It would be nice to see an unbiased back to back dyno of a standard downpipe with the stock o2 housing and then one with something like the AMS cast piece. I just have a UR downpipe with stock o2 and didn't think there would be much power in replacing it, but it would be nice to know for sure.
I'm sure someone has tested this?
I did do some testing of running a full exhaust vs an open dump (stock o2 housing) and it was a consistent 7hp difference with no exhaust, via Data Log Lab
I'm sure someone has tested this?
I did do some testing of running a full exhaust vs an open dump (stock o2 housing) and it was a consistent 7hp difference with no exhaust, via Data Log Lab
#6
AMS had a thread about the downpipe. They reported no gains what so ever. Ill see if i can find it.
Edit- here it is
https://www.evolutionm.net/forums/ev...zero-gain.html
Edit- here it is
https://www.evolutionm.net/forums/ev...zero-gain.html
Last edited by Ltdanish07; Jan 28, 2010 at 06:17 PM.
#7
AMS had a thread about the downpipe. They reported no gains what so ever. Ill see if i can find it.
Edit- here it is
https://www.evolutionm.net/forums/ev...zero-gain.html
Edit- here it is
https://www.evolutionm.net/forums/ev...zero-gain.html
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#8
Well if you actually browsed through it, you would find a dyno graph on there regarding the 02.
hint-page 8
Last edited by Ltdanish07; Jan 28, 2010 at 06:52 PM.
#9
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From: driving the 10 second beast in ohio or running lightmods.net
so they took a stock evo x and dyno'd it , swapped the downpipe out and then retested it? if so i am not suprised they didn't make any gains enlarging the front portion of the exhaust and leaving the stock restrictive cat and catback. i want someone with a modded car like mine (intake, bc, intercooler and piping, 3 inch o2 and back and a tune ,cams ) then swap to a o2 downpipe ....thats where i want to see gains. Otherwise do you have a ams test of a stock car only adding the o2 downpipe and gaining 10-15whp with all else the same?
#10
since your going with a bigger turbo, i say go for it. even if the stock o2 isnt really restrictive now, its def going to be a bottle neck with a bigger turbo.
Just my .2 cents
Just my .2 cents
#11
#12
BR said there is really no to minimal gain from doing a downpipe on stock turbo, since the stock one can flow fine. It's after 400 whp or so that a upgraded is recommended. If you plan on doing a larger turbo a upgrade might show just cause. Probably something like the BBX would gain since it can flow 30 psi at 7000rpm.
#13
#14
Haha, gotchya. My bad... just the way you mentioned that it was a thread proving there is no gain for downpipes then I pointed out that it's not including o2 downpipes which DO increase power you say 'well there are o2 dynos on page 8' kind of came off like you were referring to them not making power.
I apologize
I apologize
#15
Haha, gotchya. My bad... just the way you mentioned that it was a thread proving there is no gain for downpipes then I pointed out that it's not including o2 downpipes which DO increase power you say 'well there are o2 dynos on page 8' kind of came off like you were referring to them not making power.
I apologize
I apologize