Full akrapovic + Full technocraft = reduced performance？

kugo188 · 12-12-2009, 10:41 PM

I have heard that in combination, the 2 systems will result in lack of backpressure， hence, decreased performance。 is this true？ is there a solution to this potential problem？

M&M · 12-13-2009, 02:43 AM

That doesn't make sense.

Splinter4784 · 12-13-2009, 05:26 AM

since those combined mods will add 43 whp (15 whp Full technocraft and 28 Full akrapovic), you should probrably get a power chip tune on top of that which would probrably give you around 20whp so then you know you not losing low end torque or back pressure. With those 3 mods your looking around 60whp

kugo188 · 12-13-2009, 05:33 AM

Quote:

Originally Posted by Splinter4784

since those combined mods will add 43 whp (15 whp Full technocraft and 28 Full akrapovic), you should probrably get a power chip tune on top of that which would probrably give you around 20whp so then you know you not losing low end torque or back pressure. With those 3 mods your looking around 60whp

what I have heard is that power simply do not work like that.
it is the right/balanced mix of mods that will give you the real power.
but I am also suspecting that a custom ECU tune might be a must on a full intake + hi-flow or straight exhaust combo.

DD GT3 RD · 12-13-2009, 06:45 AM

Tune definitely necessary...POWERCHIP done deal

Checkcaptain · 12-13-2009, 11:01 AM

Quote:

Originally Posted by sammyrusso

Tune definitely necessary...POWERCHIP done deal

+1! Tune gives the most power gain and avoids CEL, but not necessary to make the setup work.

Eugene-TAIWAN · 12-13-2009, 06:45 PM

Quote:

Originally Posted by kugo188

I have heard that in combination, the 2 systems will result in lack of backpressure， hence, decreased performance。 is this true？ is there a solution to this potential problem？

nope you will get very good pwr. It was me who posted a decrease in pwr but It was my Primary O2 sensor giving me this problem.

GET it its good. I would keep it but I am getting a supercharger so I sold it to a forum member in HK.

PM me if you have any problems or questions I was the first in asia to get this setup.

Cheers my fellow Chinese Brother

kugo188 · 12-14-2009, 12:09 AM

can I get 500hp with full akrapovic + full technocraft + pully + ECU? how about in Torque?

Eugene-TAIWAN · 12-14-2009, 06:38 AM

Quote:

Originally Posted by kugo188

can I get 500hp with full akrapovic + full technocraft + pully + ECU? how about in Torque?

YOu will come close but not 500hp.

you will hit about 390-400 whp. The best I got was 388whp but that is without the Envy full set up.

kugo188 · 12-18-2009, 04:04 AM

ECU
Intake+Filter
Pully
Full exhaust
what's next? I want the full 500hp!~ no supercharger please~

ersin · 12-18-2009, 10:01 AM

Quote:

Originally Posted by kugo188

I have heard that in combination, the 2 systems will result in lack of backpressure， hence, decreased performance。 is this true？ is there a solution to this potential problem？

Lack of back pressure is a good thing. If it were bad then why are these things making more hp, i.e. increased performance? An ECU tune, custom for the setup, will make even more gains.

Cheers

Ilia@IND · 12-18-2009, 10:22 AM

Quote:

Originally Posted by kugo188

I have heard that in combination, the 2 systems will result in lack of backpressure， hence, decreased performance。 is this true？ is there a solution to this potential problem？

This is a common misconception. A better flowing exhaust system will increase power and torque simultaneously. Horsepower is a function of torque, and therefore a gain in horsepower can't really come with a loss in torque. Some modifications will move the powerband, causing a loss in low end power with a gain in high end power, but the claim that a loss of power can result from reduced backpressure or increased flow is incorrect.

When designing exhaust systems, it's important to balance two key factors: exhaust flow velocity, and exhaust flow volume. The intended goal is always to evacuate as much exhaust gas from the combustion chamber as possible, to provide room for a clean intake charge in the next intake stroke, and even to possibly introduce a scavenging effect that will "force" intake air into the combustion chamber.

A high flow velocity will help to evacuate exhaust gasses. A high flow volume will do this also. The issue is, to increase flow volume, you increase piping size. To increase flow velocity, you reduce piping size. As you increase piping size, flow volume increases, but flow velocity decreases. As you decrease piping size, flow velocity might increase, but flow volume will decrease. So of course there is an ideal balance for each engine, and this balance is different for each engine based on it's volumetric efficiency, target operating range in terms of RPM, etc... Of course there are other factors involved, and this is a highly simplified version of things, but that's the basic rule. At the extreme end, a 6" pipe would reduce flow velocity to such a degree that power loss would occur, while a 1/4" pipe would reduce flow volume to such a degree that power loss would also occur.

This is how the "too much flow is bad" myth got started. Too little flow velocity is bad. More exhaust flow will mean more power every time, all other factors being equal.

Of course, there are many other factors to consider, and I'm by no means an expert in exhaust systems engineering, I just know a few things.

Bob MG · 02-18-2010, 05:33 AM

definitely not, I have both and HP increased

Donbona · 02-18-2010, 05:40 AM

I have 460hp with full Akra + Airbox and remap. Not sure if you can reach 500hp unless you do what Pencil Geek did or go for a Supercharger.

Quote:

Originally Posted by kugo188

can I get 500hp with full akrapovic + full technocraft + pully + ECU? how about in Torque?

cuban335i · 02-18-2010, 09:30 AM

the whp is the thing that matters anyways... if you want to brag to your friends that you have "500 horsepower" than you can just lie to them and say you do... because they won't know the difference anyways..

Levi · 02-18-2010, 11:11 AM

Quote:

Originally Posted by kugo188

ECU
Intake+Filter
Pully
Full exhaust
what's next? I want the full 500hp!~ no supercharger please~

Dinan High Flow Throttle bodies and Dinan Diff.

or

Stroker-Kit.

xxe92xx · 02-18-2010, 03:18 PM

akra isnt going to provide the most power, if you want the most power from an exhaust do the full gintani system....and from what i've seen technocraft is a bunch of bullshit, your stock intake is the best dont mess with it juss change the filter

skoot3r · 02-18-2010, 03:32 PM

Quote:

Originally Posted by xxe92xx

akra isnt going to provide the most power, if you want the most power from an exhaust do the full gintani system....and from what i've seen technocraft is a bunch of bullshit, your stock intake is the best dont mess with it juss change the filter

seen the full system in person and wasn't very impressed..

BMRLVR · 02-18-2010, 03:40 PM

Quote:

Originally Posted by skoot3r

seen the full system in person and wasn't very impressed..

I'd assume you mean the Technocraft Envy.......I can't anyone not being impressed by the craftsmanship of the Akrapovic.

m33 · 02-18-2010, 04:06 PM

Let's not forget the dinan full exhaust system , I would place that at the top aswell it's claims are true and consistant .....
Biglare has it and has seen good gains ..

skoot3r · 02-18-2010, 04:53 PM

Quote:

Originally Posted by BMRLVR

I'd assume you mean the Technocraft Envy.......I can't anyone not being impressed by the craftsmanship of the Akrapovic.

yes I am talking about technocraft envy. The Akrapovic is a work of art.

xxe92xx · 02-18-2010, 05:23 PM

Quote:

Originally Posted by BMRLVR

I'd assume you mean the Technocraft Envy.......I can't anyone not being impressed by the craftsmanship of the Akrapovic.

the akra is so expensive but it provides as much gains as the dinan full system...if i can get more performance at a way cheaper price than hell yeah (gintani)....so i dont see a reason to spend that much, the craftsmanship is the best im not arguing that...i love my gintani

12-12-2009, 10:41 PM	#1
kugo188 Enlisted Member Drives: E90 M3 Join Date: Sep 2009 Location: Beijing Posts: 35 iTrader: (0)	Full akrapovic + Full technocraft = reduced performance？ I have heard that in combination, the 2 systems will result in lack of backpressure， hence, decreased performance。 is this true？ is there a solution to this potential problem？
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12-13-2009, 05:26 AM	#3
Splinter4784 414 little horsies Drives: 2008 M3 Join Date: Jan 2009 Location: Beverly Hills Posts: 407 iTrader: (2)	since those combined mods will add 43 whp (15 whp Full technocraft and 28 Full akrapovic), you should probrably get a power chip tune on top of that which would probrably give you around 20whp so then you know you not losing low end torque or back pressure. With those 3 mods your looking around 60whp __________________ Race Precision Inc

12-13-2009, 06:45 AM	#5
DD GT3 RD Major Drives: 08 M3 DCT AW/Red Join Date: May 2009 Location: West Hollywood Posts: 1,252 iTrader: (1)	Tune definitely necessary...POWERCHIP done deal __________________ 13 E92 M3 ZCP - WSIR 1:34:5 / BW C13 2:03:6 (stock besides wheels/tires R-s3) Past: Boss 302 - WSIR 1:32:8 / BW C13 2:02:00 C63 w/P31 / 997.2 GT3 / E92 M3 / B7 RS4

02-18-2010, 09:30 AM	#15
cuban335i Brigadier General Drives: '12 M3/'09 e92 335i/'11 MCS Join Date: Feb 2009 Location: central NJ Posts: 3,546 iTrader: (18)	the whp is the thing that matters anyways... if you want to brag to your friends that you have "500 horsepower" than you can just lie to them and say you do... because they won't know the difference anyways.. __________________ '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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12-13-2009, 02:43 AM	#2
M&M Captain Drives: E92 M3 Competition Pack Join Date: Mar 2007 Location: Johannesburg, South Africa Posts: 651 iTrader: (0)	That doesn't make sense.

12-14-2009, 12:09 AM	#8
kugo188 Enlisted Member Drives: E90 M3 Join Date: Sep 2009 Location: Beijing Posts: 35 iTrader: (0)	can I get 500hp with full akrapovic + full technocraft + pully + ECU? how about in Torque?

12-18-2009, 04:04 AM	#10
kugo188 Enlisted Member Drives: E90 M3 Join Date: Sep 2009 Location: Beijing Posts: 35 iTrader: (0)	ECU Intake+Filter Pully Full exhaust what's next? I want the full 500hp!~ no supercharger please~

02-18-2010, 05:33 AM	#13
Bob MG Moderating Drives: like a muppet Join Date: Oct 2009 Location: Vienna Posts: 1,738 iTrader: (0)	definitely not, I have both and HP increased

02-18-2010, 03:18 PM	#17
xxe92xx Banned Drives: 08 M3 Join Date: Oct 2008 Location: Milwaukee, WI Posts: 783 iTrader: (2)	akra isnt going to provide the most power, if you want the most power from an exhaust do the full gintani system....and from what i've seen technocraft is a bunch of bullshit, your stock intake is the best dont mess with it juss change the filter

02-18-2010, 04:06 PM	#20
m33 Banned Drives: E92 VT650 MCB Individual Join Date: Dec 2008 Location: CT Posts: 2,679 iTrader: (5)	Let's not forget the dinan full exhaust system , I would place that at the top aswell it's claims are true and consistant ..... Biglare has it and has seen good gains ..