|
|
|
Post Reply |
|
Thread Tools | Search this Thread |
06-20-2013, 10:27 PM | #23 |
Major General
903
Rep 9,034
Posts |
Now someone needs to dyno this X-pipe on a FBO car vs. an Evo.
__________________
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
|
Appreciate
0
|
06-20-2013, 10:35 PM | #24 | |
Brigadier General
477
Rep 3,044
Posts
Drives: 2011 Dakar Yellow M3, 2018 M5
Join Date: Feb 2007
Location: Orange County, California
|
Quote:
__________________
[ESS VT2-625] [Akrapovic Evolution Exhaust] [KW Clubsports] [OSS Angel Eyes] [Revinora r-CRT Lip] [Vorsteiner Boot] [Challenge Race Diffuser] [See the Build Thread HERE] |
|
Appreciate
0
|
06-20-2013, 10:44 PM | #25 |
Major General
2766
Rep 5,483
Posts |
Boost drop is a clear indicator the akra was more restrictive, dead giveaway on a supercharged car.
__________________
Last edited by Richbot; 06-21-2013 at 05:56 AM.. |
Appreciate
0
|
06-21-2013, 11:12 AM | #26 |
Major General
2760
Rep 6,735
Posts
Drives: 'E46 M3 Race Car, '23 X7
Join Date: Jan 2009
Location: Wisconsin - Instagram - @slicer_m
|
Akra will not pass emissions in CA. Not sure about other states.
__________________
'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M |
Appreciate
0
|
06-21-2013, 11:27 AM | #27 |
Lieutenant Colonel
165
Rep 1,506
Posts
Drives: '15 FO M4
Join Date: Sep 2010
Location: NorCal Bay Area
|
I wonder what the difference would be with AA HFC x-pipe vs the Akra Evo HFC x-pipe given the AA HFCs are positioned as primaries and the Akra HFCs are positioned as secondaries.
__________________
Fire Orange F82 Built by Alekshop | Pure Stage 2 Turbos | Akrapovic Evolution and Downpipes | ESS T-500 Performance ECU Software | Evolution Racewerks Chargepipes | Gruppe M CAI | Awron Gauge w/ Valve Control | KW Clubsport | Brembo GT 380 F&R | 19" BBS FI-R | BMW Performance Seats, Aero, and Steering Wheel | Vorsteiner Diffuser | IND Cosmetics
|
Appreciate
0
|
06-21-2013, 11:35 AM | #28 |
Banned
1772
Rep 6,696
Posts
Drives: F30 340i
Join Date: Jan 2009
Location: San Diego,CA
|
exactly. i remember i pm'ed him awhile back and was curious what they went for. he charged a very fair price for what was being offered imo
|
Appreciate
0
|
06-21-2013, 11:40 AM | #29 |
Major General
2766
Rep 5,483
Posts |
Usually the further downstream the restriction, the lower the impact on peak power, would be a good same day/dyno/car test
__________________
|
Appreciate
0
|
06-21-2013, 12:02 PM | #30 | |
Major General
3479
Rep 6,785
Posts
Drives: 2016 BMW i8
Join Date: Dec 2006
Location: Monarch Beach
iTrader: (1)
Garage List 2012 BMW e92 M3 [0.00]
2021 BMW X5M [10.00] 2015 Porsche 991 Tu ... [10.00] 2015 Porsche 991 GT3 [10.00] |
Quote:
http://www.mrfengineering.com/wp-con...-velaforza.jpg Oh yeah, after going for a ride in Malek's car I was like WTF this thing is so visceral and fast as hell. It felt WAAAAAAYYYYY faster than my stock M3. Other than the full MRF exhaust I think it also has a tune but nothing else.
__________________
Current BMWs: 2022 X5 40i, 2016 X5 50i
2015 Porsche 991 Turbo S 1979 Porsche 911 Turbo (930) a couple others IG: longboarder949; YouTube: https://www.youtube.com/channel/UCT1...eoFBszPIK0gf9w |
|
Appreciate
0
|
06-21-2013, 12:12 PM | #31 | |
Lieutenant Colonel
165
Rep 1,506
Posts
Drives: '15 FO M4
Join Date: Sep 2010
Location: NorCal Bay Area
|
Quote:
Regardless, I've since switched to 19" BBS FI and will be going catless to see if the gains are worth the rasp and smell.
__________________
Fire Orange F82 Built by Alekshop | Pure Stage 2 Turbos | Akrapovic Evolution and Downpipes | ESS T-500 Performance ECU Software | Evolution Racewerks Chargepipes | Gruppe M CAI | Awron Gauge w/ Valve Control | KW Clubsport | Brembo GT 380 F&R | 19" BBS FI-R | BMW Performance Seats, Aero, and Steering Wheel | Vorsteiner Diffuser | IND Cosmetics
|
|
Appreciate
0
|
06-21-2013, 12:53 PM | #32 |
Brigadier General
477
Rep 3,044
Posts
Drives: 2011 Dakar Yellow M3, 2018 M5
Join Date: Feb 2007
Location: Orange County, California
|
I believe the MRF unit is within 1 pound of the Akra Unit - it might even be lighter. Malek@MRF will be in a better position to give a precise answer. Either way, the weights are very close, which I think will surprise a lot of people.
__________________
[ESS VT2-625] [Akrapovic Evolution Exhaust] [KW Clubsports] [OSS Angel Eyes] [Revinora r-CRT Lip] [Vorsteiner Boot] [Challenge Race Diffuser] [See the Build Thread HERE] |
Appreciate
0
|
06-21-2013, 01:20 PM | #33 |
Major
427
Rep 1,325
Posts |
Nice write up esquire. That is a huge surprise, since many people consider Akra to be the gold standard. Enjoy your new-found power!
I am interested to see the technical reasoning behind this. Hopefully Malek can chime in.
__________________
|
Appreciate
0
|
06-21-2013, 03:07 PM | #34 |
Lieutenant
161
Rep 580
Posts |
That is stunning. Could it be because the HFC on the Akra are somewhat restrictive on a FI set up? Perhaps the real test should be Gintani catless X-pipe vs Akra GT4 X-pipe vs MRF catless X-pipe.
Enjoy your new found gains! I suspect a resurgence in demand for this mythical unicorn X-pipe.
__________________
2013 E92 M3 Mineral White Fox Red / Black
|
Appreciate
0
|
06-21-2013, 08:13 PM | #35 | ||||||
Brigadier General
477
Rep 3,044
Posts
Drives: 2011 Dakar Yellow M3, 2018 M5
Join Date: Feb 2007
Location: Orange County, California
|
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
I wish people could feel how insane fast this car is now compared to how it was before. Its seriously ferocious. The fact that the car is getting to 575 on 91 octane... I'm thinking I might have a chance of hitting 600 Hp to the wheels on 95 octane.
__________________
[ESS VT2-625] [Akrapovic Evolution Exhaust] [KW Clubsports] [OSS Angel Eyes] [Revinora r-CRT Lip] [Vorsteiner Boot] [Challenge Race Diffuser] [See the Build Thread HERE] |
||||||
Appreciate
0
|
06-21-2013, 09:54 PM | #36 |
Major General
903
Rep 9,034
Posts |
Anyone have a pic of this uberX-pipe??
__________________
Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
|
Appreciate
0
|
06-21-2013, 09:57 PM | #37 |
E46 + E90 + F80
193
Rep 2,895
Posts
Drives: E46 + E90 + F80
Join Date: Jul 2008
Location: Illinois
|
From a For Sale Thread here on the forums
__________________
F80 M3 DCT|Alpine White . Black Leather | My Build Thread
E90 M3 DCT|Melbourne Red . Speed Cloth | My Build Thread E46 M3 6MT|Jet Black . Black Nappa Leather | My Build Thread |
Appreciate
0
|
06-22-2013, 06:00 AM | #39 |
Lieutenant General
5604
Rep 11,055
Posts |
He has the X located further forward than on some x-pipes. From what I understand, the X should be located close to the end of the headers, but the transmission usually gets in the way on V8s. I think RPI also puts the X further forward than most x-pipes.
The X may be more carefully welded in the X section and that could help the balance of flow. Some of the X-pipes using longer curved sections for the X do not allow the builder access to the inside mating surfaces to make sure they fit well. The rest is 2.5 inch pipe, and 2.5 inch pipe is 2.5 inch pipe. |
Appreciate
0
|
06-22-2013, 10:12 PM | #40 | |
Major General
599
Rep 5,396
Posts |
Quote:
So as far as emissions go, catless and akra are identical since neither have cats between the primary and secondary o2 sensors. |
|
Appreciate
0
|
06-22-2013, 11:15 PM | #41 | ||
BimmerPost Supporting Vendor
3406
Rep 7,487
Posts |
Quote:
Only the Akra GT4 is Catless. |
||
Appreciate
0
|
06-23-2013, 06:01 AM | #42 |
Major General
599
Rep 5,396
Posts |
|
Appreciate
0
|
06-23-2013, 06:06 AM | #43 |
Colonel
60
Rep 2,185
Posts |
Very true. Thanks
__________________
Vf supercharger + tune/H&R coils/ Akra evolution exhaust/Volk te37/ Rs-3 tires/ Brembos /TIal BOV/ OSS blacked out headlights/LUX v3/Led taillights/ Challenge Front lip/ P3 vent gauge/ F10 m5 shift mob/Matte black front grills/ And a funky air fresher
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|