Full turbo back 3" exhaust?

cuban335i · 10-05-2009, 11:52 PM

how come no one has come out with a full 3 inch turbo back exhaust system? would the gains not be that much different from the current setups now?

for example: full 3" downpipes from end to end and something like the AE exhaust but instead of 2.5" pipes 3" pipes...

Donald-335i · 10-05-2009, 11:53 PM

AMS! Has just come out with the system..

cuban335i · 10-05-2009, 11:56 PM

yea but theirs is 1 pipe.. i'm talking about 2..

badass1g · 10-06-2009, 12:25 AM

yea a true dual full 3" system would be AWESOME. no peicing it all together. no cats with a couple high flow muffs on the rear would be ideal for me. imagine those turbos spooling full boost at like 1800 rpm lol

6spdMSport · 10-06-2009, 12:33 AM

iam thinking about the same, can it be done ?

TMR · 10-06-2009, 12:35 AM

No room for the pipes. I had a hard time with a single 3"

Donald-335i · 10-06-2009, 12:39 AM

How can there be no room?

XPO186 · 10-06-2009, 04:45 AM

I vaguely remember watching a YouTube video of someone who did this...

1clean335i · 10-06-2009, 08:19 AM

A full dual 3" exhaust is not needed for those tiny turbos.........

BMWCadet · 10-06-2009, 08:20 AM

If it could be done with two pipes, i'm sure it would've been for sale already. From previous threads, there's no room to do 3" which is why AMS is going with one pipe.

Fern8321 · 10-06-2009, 10:34 AM

Quote:

Originally Posted by 1clean335i

A full dual 3" exhaust is not needed for those tiny turbos.........

agreed. unless you upgrade the turbos you dont need 3" piping..you would probally end up losing power

TurboSid · 10-06-2009, 10:38 AM

dual 3" would be overkill even if you had upgraded turbos IMO.

High hp cars street cars (700-800+) run 4" single at most.

ShortCkT101 · 10-06-2009, 10:46 AM

Quote:

Originally Posted by cuban335i

yea but theirs is 1 pipe.. i'm talking about 2..

For those two little baby turbo there is no need for 3" piping.

SlicktopTTZ · 10-06-2009, 11:08 AM

Quote:

Originally Posted by Nando

agreed. unless you upgrade the turbos you dont need 3" piping..you would probally end up losing power

Not true, turbos are the backpressure in the exhaust and do all the scavenging, you want the LEAST amount of restriction possible. Why do you think AMS's drag EVO runs a HUGE pipe right off the turbo out the side towards the ground? You want absolutely NO backpressure after the turbo! If we have 2 3" downpipes squeezing down to fit a single 3" I am sure there would be power to gain with 3" downpipes with their own 3" piping all the way back, the more boost the more noticeable the flow increase would become. It may be a small gain, but power is great and I want as much as I can get!

Former_Boosted_IS · 10-06-2009, 11:24 AM

Quote:

Originally Posted by SlicktopTTZ

Not true, turbos are the backpressure in the exhaust and do all the scavenging, you want the LEAST amount of restriction possible. Why do you think AMS's drag EVO runs a HUGE pipe right off the turbo out the side towards the ground? You want absolutely NO backpressure after the turbo! If we have 2 3" downpipes squeezing down to fit a single 3" I am sure there would be power to gain with 3" downpipes with their own 3" piping all the way back, the more boost the more noticeable the flow increase would become. It may be a small gain, but power is great and I want as much as I can get!

The additional power is worthless and the increase noise/drone is just no worth it. The amount you can flow through the stock diameter will support well into the 500 rwhp range.

SlicktopTTZ · 10-06-2009, 11:35 AM

Quote:

Originally Posted by Former_Boosted_IS

The additional power is worthless and the increase noise/drone is just no worth it. The amount you can flow through the stock diameter will support well into the 500 rwhp range.

Worthless to someone who wants a civil exhaust yes, but if you are in the group who is doing every tweak possible just to go faster than it would not be considered worthless. And yeah, you can run 500whp worth of air through the stock pipes, but that isn't the point. The point is that 500whp worth of air could equal 550whp with reduced backpressure/turbulence. Like you said, it would be loud and drone, but to say it is not worth it is just your opinion. That being said, I run a 3" pipe off each of my two GT2560s with no mufflers/resonators and I LOVE the noise!

1clean335i · 10-06-2009, 11:41 AM

Quote:

Originally Posted by SlicktopTTZ

Worthless to someone who wants a civil exhaust yes, but if you are in the group who is doing every tweak possible just to go faster than it would not be considered worthless. And yeah, you can run 500whp worth of air through the stock pipes, but that isn't the point. The point is that 500whp worth of air could equal 550whp with reduced backpressure/turbulence. Like you said, it would be loud and drone, but to say it is not worth it is just your opinion. That being said, I run a 3" pipe off each of my two GT2560s with no mufflers/resonators and I LOVE the noise!

No way in hell there would be a 50whp gain.

Your also comparing your gt2560's to the stock pea-shooter twins. They dont have the airflow to need 3" piping off of each turbo. Period. Upgraded twins is a different story. But even at that, i'd rather have a single 3" or 4" than duals.

Former_Boosted_IS · 10-06-2009, 11:41 AM

Quote:

Originally Posted by SlicktopTTZ

Worthless to someone who wants a civil exhaust yes, but if you are in the group who is doing every tweak possible just to go faster than it would not be considered worthless. And yeah, you can run 500whp worth of air through the stock pipes, but that isn't the point. The point is that 500whp worth of air could equal 550whp with reduced backpressure/turbulence. Like you said, it would be loud and drone, but to say it is not worth it is just your opinion. That being said, I run a 3" pipe off each of my two GT2560s with no mufflers/resonators and I LOVE the noise!

Ok, no point in arguing this with you. I think if you do the math then you will see there is no way you could ever feel a difference. You asked in the OP if there would be a power difference and the answer is no.

SlicktopTTZ · 10-06-2009, 11:58 AM

So you guys are saying with the JB3 and meth/race gas at 18-22psi (not sure what the highest race map is at boost wise) that these turbos wouldn't benefit from having unsqueezed exhaust all the way back? Oldbooster recently dyno'd with 525ftlbs at the wheels with race gas/meth/25 shot no2 and his car cut out early at 5,000rpm, he is at the point where every little bit will count. Even if it was only 15whp, what does that equal in 1/4 time where even a tenth of a second counts?

Fern8321 · 10-06-2009, 12:02 PM

i actually thought about doing that also before getting my exhaust..after doing my homework(and i think most people will agree) the stock piping is actually one of the better exhausts you can have for your car(obviously with cat removal, etc.) These cars arent the same as a supra for example or even a boosted civic...unless your upgrading the turbos and boosting like crazy you dont need 3 inch piping...i actually have a custom exhaust which uses the stock piping and my car is fast...and its alot faster than some other 335's i know with similar mods bbut then again it your car and if you want that go for it..let us know how it is

Fern8321 · 10-06-2009, 12:04 PM

when i was looking this up i read something about thermal velocity, thats why they were sayongt he stock piping is actually pretty good..ill try to find the article and post it

SlicktopTTZ · 10-06-2009, 12:07 PM

http://supraforums.com/forum/showthr...light=step+rev

"For 250HP, a single 2.5" exhaust is fine. Going to 3" at this power won't get you anything other than a louder exhaust note. 300HP and you're definitely sub-optimal with (a single) 2.5". For 400-450HP, even 3" (single) is on the small side" This is from a Garret turbo engineer.

10-05-2009, 11:52 PM	#1
cuban335i Brigadier General 238 Rep 3,550 Posts Drives: 535i xdrive Join Date: Feb 2009 Location: central NJ iTrader: (18)	Full turbo back 3" exhaust? how come no one has come out with a full 3 inch turbo back exhaust system? would the gains not be that much different from the current setups now? for example: full 3" downpipes from end to end and something like the AE exhaust but instead of 2.5" pipes 3" pipes... __________________ Current: '13 F10 535i xDrive - lightly modded for now Previous: '12 e92 M3 Melbourne Red/Bamboo - ADV.1 ADV10, Volk TE37SL, OSS, Innotech F1, Arkym, iND '09 e92 335i Alpine White/Saddle Brown - fully modded
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10-05-2009, 11:53 PM	#2
Donald-335i Banned 202 Rep 3,588 Posts Drives: The Hoes Crazy! Join Date: Nov 2008 Location: Central NJ iTrader: (13)	AMS! Has just come out with the system..
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10-05-2009, 11:56 PM	#3
cuban335i Brigadier General 238 Rep 3,550 Posts Drives: 535i xdrive Join Date: Feb 2009 Location: central NJ iTrader: (18)	yea but theirs is 1 pipe.. i'm talking about 2.. __________________ Current: '13 F10 535i xDrive - lightly modded for now Previous: '12 e92 M3 Melbourne Red/Bamboo - ADV.1 ADV10, Volk TE37SL, OSS, Innotech F1, Arkym, iND '09 e92 335i Alpine White/Saddle Brown - fully modded
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10-06-2009, 12:25 AM	#4
badass1g Captain 53 Rep 646 Posts Drives: 07 335i Join Date: Oct 2009 Location: utah iTrader: (7)	yea a true dual full 3" system would be AWESOME. no peicing it all together. no cats with a couple high flow muffs on the rear would be ideal for me. imagine those turbos spooling full boost at like 1800 rpm lol
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10-06-2009, 12:33 AM	#5
6spdMSport Private 5 Rep 94 Posts Drives: Jet Black 135i Sport/USB/iPod Join Date: Aug 2009 Location: 727 iTrader: (-2)	iam thinking about the same, can it be done ? __________________ 09 Jet Black 135i /// M-Sport BMS DCI /// JB3 2.0 /// AA Chargepipe & BOV /// AA FMIC /// VK Downpipes /// H&R Super-Sports /// SpunTek Custom Piping/// Miami Muffler Custom Cat-Back(Straight Pipe)/// BMS CDV/// Carbon Fiber Grills/// DEFI Boost Gauge
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10-06-2009, 12:35 AM	#6
TMR Brigadier General 398 Rep 3,157 Posts Drives: M3 Join Date: Jun 2008 Location: Torrance iTrader: (12)	No room for the pipes. I had a hard time with a single 3"
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10-06-2009, 12:39 AM	#7
Donald-335i Banned 202 Rep 3,588 Posts Drives: The Hoes Crazy! Join Date: Nov 2008 Location: Central NJ iTrader: (13)	How can there be no room?
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10-06-2009, 04:45 AM	#8
XPO186 Colonel 130 Rep 2,740 Posts Drives: E92 335i Join Date: May 2007 Location: Albany, NY iTrader: (19)	I vaguely remember watching a YouTube video of someone who did this... __________________
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10-06-2009, 08:19 AM	#9
1clean335i Perf BMW mag issue 147, 159 432 Rep 6,799 Posts Drives: Project Estoril Join Date: Feb 2007 Location: Miami, FL iTrader: (31) Garage List 2013 335i M-sport [0.00] 2011 X5 xdrive35i M ... [0.00] 2009 335i M-sport [0.00] 07' 335i Sedan [0.00]	A full dual 3" exhaust is not needed for those tiny turbos......... __________________ '13 Estoril Blue 335i M-sport *Don't PM me!* Message me here- http://www.facebook.com/ProjectEstoril
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10-06-2009, 08:20 AM	#10
BMWCadet Lieutenant 7 Rep 402 Posts Drives: BMW E92 MR M3 Join Date: May 2009 Location: Fort Gordon, Georgia iTrader: (0)	If it could be done with two pipes, i'm sure it would've been for sale already. From previous threads, there's no room to do 3" which is why AMS is going with one pipe.
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10-06-2009, 10:38 AM	#12
TurboSid Brigadier General 1155 Rep 3,269 Posts Drives: 2022 M4Cx BSM/FR Join Date: Apr 2008 Location: Florida iTrader: (4) Garage List 2008 335i [0.00]	dual 3" would be overkill even if you had upgraded turbos IMO. High hp cars street cars (700-800+) run 4" single at most. __________________ 2022 BSM/FR M4 Competition X-Drive 2017 MW/SO M4 ZCP [SOLD] • 2015 MW/SO M4 M-DCT FBO [SOLD] • 2011 AW/CR 335is DCT FBO [SOLD] • 2008 AW/CR 335i 6MT FBO [SOLD]
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10-06-2009, 11:58 AM	#19
SlicktopTTZ Captain 13 Rep 685 Posts Drives: 91 300ZX Twin-Turbo, 2010 135i Join Date: Aug 2009 Location: Corpus Christi, Texas iTrader: (0)	So you guys are saying with the JB3 and meth/race gas at 18-22psi (not sure what the highest race map is at boost wise) that these turbos wouldn't benefit from having unsqueezed exhaust all the way back? Oldbooster recently dyno'd with 525ftlbs at the wheels with race gas/meth/25 shot no2 and his car cut out early at 5,000rpm, he is at the point where every little bit will count. Even if it was only 15whp, what does that equal in 1/4 time where even a tenth of a second counts?
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10-06-2009, 12:02 PM	#20
Fern8321 Captain 32 Rep 803 Posts Drives: X5 M60i Join Date: Sep 2009 Location: Naples, FL iTrader: (3)	i actually thought about doing that also before getting my exhaust..after doing my homework(and i think most people will agree) the stock piping is actually one of the better exhausts you can have for your car(obviously with cat removal, etc.) These cars arent the same as a supra for example or even a boosted civic...unless your upgrading the turbos and boosting like crazy you dont need 3 inch piping...i actually have a custom exhaust which uses the stock piping and my car is fast...and its alot faster than some other 335's i know with similar mods bbut then again it your car and if you want that go for it..let us know how it is
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10-06-2009, 12:04 PM	#21
Fern8321 Captain 32 Rep 803 Posts Drives: X5 M60i Join Date: Sep 2009 Location: Naples, FL iTrader: (3)	when i was looking this up i read something about thermal velocity, thats why they were sayongt he stock piping is actually pretty good..ill try to find the article and post it
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10-06-2009, 12:07 PM	#22
SlicktopTTZ Captain 13 Rep 685 Posts Drives: 91 300ZX Twin-Turbo, 2010 135i Join Date: Aug 2009 Location: Corpus Christi, Texas iTrader: (0)	http://supraforums.com/forum/showthr...light=step+rev "For 250HP, a single 2.5" exhaust is fine. Going to 3" at this power won't get you anything other than a louder exhaust note. 300HP and you're definitely sub-optimal with (a single) 2.5". For 400-450HP, even 3" (single) is on the small side" This is from a Garret turbo engineer.
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