Downpipe test = Zero gain
Jan 8, 2010, 01:52 AM
#106
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Jan 8, 2010, 08:07 AM
#108
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You guys resurrected an ancient thread where AMS showed no results with just the downpipe. I assume this was before they created and began selling their own o2/downpipe. It's the o2 part that gets you the gains.
http://www.amsperformance.com/cart/A...-Downpipe.html
There are all kinds of dyno graphs showing the gains from o2/downpipes. This is the brand that I bought:
http://www.amsperformance.com/cart/A...-Downpipe.html
There are all kinds of dyno graphs showing the gains from o2/downpipes. This is the brand that I bought:
Last edited by mlomker; Jan 8, 2010 at 08:10 AM.
Jan 8, 2010, 09:17 AM
#109
That makes no sense since the O2 housing and downpipe are post-turbo restrictions. Making them higher-flowing would allow the same turbo on the same engine to produce more boost efficiently since the turbine wheel would be under less back-pressure on the exit side.
Same goes for replacing your exhaust with a high-flowing cat-back exhaust. It will decrease spool time and cause your boost to actually increase.
Eliminating intake restrictions and increasing internal engine efficiency would cause the effect you describe.
Trust me, I've been through countless iterations of exhaust systems on my other turbo car. Less post-turbo exhaust restriction = more boost. You're right about the required WGDC, however. But it's intake restriction that regulates boost pressure, not exhaust restriction.
Same goes for replacing your exhaust with a high-flowing cat-back exhaust. It will decrease spool time and cause your boost to actually increase.
Eliminating intake restrictions and increasing internal engine efficiency would cause the effect you describe.
Trust me, I've been through countless iterations of exhaust systems on my other turbo car. Less post-turbo exhaust restriction = more boost. You're right about the required WGDC, however. But it's intake restriction that regulates boost pressure, not exhaust restriction.
Jan 9, 2010, 01:40 PM
#111
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You guys resurrected an ancient thread where AMS showed no results with just the downpipe. I assume this was before they created and began selling their own o2/downpipe. It's the o2 part that gets you the gains.
http://www.amsperformance.com/cart/A...-Downpipe.html
There are all kinds of dyno graphs showing the gains from o2/downpipes. This is the brand that I bought:
http://www.amsperformance.com/cart/A...-Downpipe.html
There are all kinds of dyno graphs showing the gains from o2/downpipes. This is the brand that I bought:
Jan 9, 2010, 01:48 PM
#112
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Apr 3, 2014, 04:37 PM
#113
Back from the dead, but....
Looking at the short DP that is required for Cobb OTS Stage 2, and then this thread, is there any reason why I cant just slap on the HFC from Cobb, and run the stock DP with a OTS stage 2 map? I can understand if cobb required the o2/downpipe as that looks and makes a difference, but the cobb dp only seems like a waist to just be able to run a stage 2 map.
Looking at the short DP that is required for Cobb OTS Stage 2, and then this thread, is there any reason why I cant just slap on the HFC from Cobb, and run the stock DP with a OTS stage 2 map? I can understand if cobb required the o2/downpipe as that looks and makes a difference, but the cobb dp only seems like a waist to just be able to run a stage 2 map.
Apr 3, 2014, 05:38 PM
#114
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A lot of people are saying downpipe but they just mean the downpipe not the elbow. If you mean the elbow and the downpipe then say so. They are 2 different things even though some campanies make them the same thing...
Apr 3, 2014, 05:59 PM
#115
I understand, I thought thats what I meant by o2/downpipe but either way, the questions there.
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