The Truth Behind Quad Setups. Seperating Fact and Fiction.
#11
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do your own research
talk to an exhaust shop that does race setups
thats the easiest way instead of asking around here, most dont know much about quads and those that have them really only wanted them for the looks etc
talk to an exhaust shop that does race setups
thats the easiest way instead of asking around here, most dont know much about quads and those that have them really only wanted them for the looks etc
#12
Dual resonators, and dual high-flow cats installed after the cross-over (x-pipe preferably) and you will be fine. These engines really like some back pressure. Took us 4 different tries to make power on the 545i with our custom setup. The high-flow cat was key. For duals, the biggest issue is the lack of room on the passenger side, you are going to be very limited in muffler selection that will fit. I would be more concerned with how you are going to hang it without rattling.
#13
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My Ride: 05 530I
What if your going the way where you replace the resonator with the center/dual magnaflow where the dual tips makes your quad. How would you set it up to not loose power.
#14
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My Ride: 2011.5 Alpine White E90 M3 | Black Novillo Leather | Carbon Fiber Leather Trim | ZCP | ZP2 | M-DCT | Navigation | Moonroof | 6FL Mods: TMS 12.5mm spacers all around l Hawk HPS Brake Pads l OEM M3 Edition Grills l Paint Matched Side Gills l Key Hole D
One dyno and a bunch of talk about magnaflow. Not convinced yet. Maybe members with quad exhausts can chime in and let us know piping diameter used and more specific information with their setups.
Also, how about getting a dyno from an individual, not a competing exhaust manufacturer.
Also, how about getting a dyno from an individual, not a competing exhaust manufacturer.
most companies do give you piping diameter info with their systems, just need to make the time to contact vendors and/or manufacturers
it's obvious you have some knowledge about engineering, so continue your research...good luck...
#15
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My Ride: 545I SMG
The reason I asked here first was only because it seems that everyone is so easy to say quads will lose power so I figured there must be a large amount of evidence to support such a common claim. I figured by this time this thread would have been with a ton of comments but surprisingly it seems that this is not the case.
crmb,
Would you mind sharing more specifics about the exhaust system you developed including piping diameter and the manufacturers of the products you used. Also, maybe some pix if you don't mind. Thanks
crmb,
Would you mind sharing more specifics about the exhaust system you developed including piping diameter and the manufacturers of the products you used. Also, maybe some pix if you don't mind. Thanks
#17
Senior Members
OK...so the shop has my car today and they're doing a dual exhaust install with quad tips. It was an additional $140 for a before/after dyno that I didn't intend on spending, but I figured I'd take one for the team in an effort to get more facts. Feel free to buy me a beer after a meet-up if the data I gather today is of help to you.
First off, a little information on my vehicle: In the shop is a 2007 550i with 39,000 miles. The only modification thus far is an RPI Air Scoop which has also undergone the air inlet grate removal (https://5series.net/forums/topic/987...grate-removed/). Unsure if wheels make a difference with dyno results, but the vehicle is currently equiped with 20" Miro M6 replicas and Falken FK252's. Oh, vehicle also features stock air filter with carbon filter delete. The car is burning 92 Octane Chevron gas.
Now for the "Before" dyno results they gathered prior to installing the new exhaust. I can't find the "under hood" temperature on either of the two printouts they gave, me so I'll let you make your best guess of under hood temperature based on vehicle usage. The car was driven less roughly 5 miles to an Auto Sport shop near Market Street in Ballard from downtown Seattle after it had been sitting in a garage all night. Upon arriving at the shop, I let the car sit with the engine turned off for 60 minutes or more while I installed LCI tail lights (and also while the shop was preparing for the day/week).
Here is my vehicle sitting on the Mustang Dynamometer prior to the first pull:
Here are the results of the first pull (I'll type the results out below as well because the printout is a little hard to read):
Engine Torque (Ft-Lbs): Min-208 / Max-276 / Avg-253
Engine Power (HP): Min-88 / Max-256 / Avg-199
AFR (Ratio): Min-11.4 / Max-14.5 / Avg-12.9
I've never seen or had a car on a dyno before, so this was pretty fun for me.
I'll follow up with details of the installation and some videos. Stand by.
First off, a little information on my vehicle: In the shop is a 2007 550i with 39,000 miles. The only modification thus far is an RPI Air Scoop which has also undergone the air inlet grate removal (https://5series.net/forums/topic/987...grate-removed/). Unsure if wheels make a difference with dyno results, but the vehicle is currently equiped with 20" Miro M6 replicas and Falken FK252's. Oh, vehicle also features stock air filter with carbon filter delete. The car is burning 92 Octane Chevron gas.
Now for the "Before" dyno results they gathered prior to installing the new exhaust. I can't find the "under hood" temperature on either of the two printouts they gave, me so I'll let you make your best guess of under hood temperature based on vehicle usage. The car was driven less roughly 5 miles to an Auto Sport shop near Market Street in Ballard from downtown Seattle after it had been sitting in a garage all night. Upon arriving at the shop, I let the car sit with the engine turned off for 60 minutes or more while I installed LCI tail lights (and also while the shop was preparing for the day/week).
Here is my vehicle sitting on the Mustang Dynamometer prior to the first pull:
Here are the results of the first pull (I'll type the results out below as well because the printout is a little hard to read):
Engine Torque (Ft-Lbs): Min-208 / Max-276 / Avg-253
Engine Power (HP): Min-88 / Max-256 / Avg-199
AFR (Ratio): Min-11.4 / Max-14.5 / Avg-12.9
I've never seen or had a car on a dyno before, so this was pretty fun for me.
I'll follow up with details of the installation and some videos. Stand by.
#18
would either of these mufflers:
http://cgi.ebay.com/ebaymotors/Magna...Q5fAccessories
http://cgi.ebay.com/ebaymotors/Magna...Q5fAccessories
work with these tips:
http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWAX:IT
and the shop can do the rest
http://cgi.ebay.com/ebaymotors/Magna...Q5fAccessories
http://cgi.ebay.com/ebaymotors/Magna...Q5fAccessories
work with these tips:
http://cgi.ebay.com/ebaymotors/ws/eB...=STRK:MEWAX:IT
and the shop can do the rest
#19
Senior Members
The parts they are installing are as follows:
1 Magnaflow Muffler part number 11385
2 Magnaflow Mufflers part number 10425
The shop has been guided to leave the Exhaust manifold(integrated cats) and two resonators alone. Everything after the resonators will be replaced. Each of the two resonators will run into one inlet of a dual-inlet, dual-outlet Muffler (11385) which contains an internal crossover pipe. Each outlet of the 11385 will run into one of the two 10425 Magnapacks, then out to the bumper where they will terminate with dual tips. The stock pipe diameter leaving the two resonators will be used throughout. All pipes are not stainless, but they will be using mandrel bends.
Here are a couple videos:
Pull1:
Pull2:
1 Magnaflow Muffler part number 11385
2 Magnaflow Mufflers part number 10425
The shop has been guided to leave the Exhaust manifold(integrated cats) and two resonators alone. Everything after the resonators will be replaced. Each of the two resonators will run into one inlet of a dual-inlet, dual-outlet Muffler (11385) which contains an internal crossover pipe. Each outlet of the 11385 will run into one of the two 10425 Magnapacks, then out to the bumper where they will terminate with dual tips. The stock pipe diameter leaving the two resonators will be used throughout. All pipes are not stainless, but they will be using mandrel bends.
Here are a couple videos:
Pull1:
Pull2: