535xi feels like its lacking power from when it was new!
07-03-2008, 07:39 PM
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My Ride: 2009 Ford F-250 Harley Davidson Edition
6.4L OHV Power Stroke Turbo Diesel V8 (350hp/650lbft)
Blue Flame Package
Dual Alternators
Touch Screen Navigation + DVD Player
Uplifter Switches
Trailer Brake Controller
Traction Control
Rapid Heat Supplemental Cab Heater
Rear View Camera
Power Slide Moonroof
The past week or so I've been feeling like my car is lacking the power it once had. I've recently replaced my exhaust. Deleted the resonators, 2 and 1/2" mandrel pipes to the Magnaflow muffler. Its a really clean A+ job, but I'm starting to wonder if it reduced the power. Could this be? I thought I would gain hp from this mod as I have on all previous cars I've owned (gt stang, wrx sti). It definately dosn't feel like my 0-60 is in the 5.4s range like it should, and when I punch it on the highway it dosn't surprise me like it used to. Is there an easy way to find out if the engine is running up to par without doing an engine analysis? I've only had the car 4 months, so in the back of my mind I'm thinking it could just be me and my car is running fine, but I'd like to make sure. Any ideas?
07-03-2008, 07:56 PM
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My Ride: 2009 Ford F-250 Harley Davidson Edition
6.4L OHV Power Stroke Turbo Diesel V8 (350hp/650lbft)
Blue Flame Package
Dual Alternators
Touch Screen Navigation + DVD Player
Uplifter Switches
Trailer Brake Controller
Traction Control
Rapid Heat Supplemental Cab Heater
Rear View Camera
Power Slide Moonroof
Carbon fiber I-drive knob.. Increases 0-60 time by 0.1-0.2s
07-03-2008, 08:00 PM
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My Ride: 2011, X6 Hybrid . Alpine White , every option. 20" Conti' NON runflats,OEM trunk spoiler , LUX V3 AE's , HP Thunder Fogs , custom front bumper reflector delete........
Originally Posted by Rudy' post='616101' date='Jul 3 2008, 11:51 PM
Did you try taking the floor mats out? 
(Sorry folks, I had to do it!!
)
(Sorry folks, I had to do it!!
)
07-03-2008, 08:04 PM
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My Ride: 2008 Alpine White 550i Sport, Cream Beige Interior, 6-Sp Manual - retired 9/2011
Rocky, wish I knew more about what happens when you screw with an exhaust. I know you can actually lose back-pressure with different or too big of a pipe, but I'll let the experts chime in....with useful comments, hopefully, unlike the ones above. 
07-03-2008, 08:08 PM
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Originally Posted by DrLev99' post='616119' date='Jul 4 2008, 12:04 AM
Rocky, wish I knew more about what happens when you screw with an exhaust. I know you can actually lose back-pressure with different or too big of a pipe, but I'll let the experts chime in....with useful comments, hopefully, unlike the ones above.
07-04-2008, 09:40 AM
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My Ride: black 2004 e60----comfort package, light package, tinted windows, custom coded features
Are all the maintenance items up to par? Typically with a free-flow exhaust system such as what you installed, one should see gains from it. You want less backpressure; that is what will increase exhaust gas scavenging and thus, power. I don't know what size exhaust piping was utilized on your particular vehicle from BMW, but if the 2.5" diameter piping you currently have is smaller than what was originally on there, that will probably explain your seeming loss of power. Also something to keep in mind is that obd based engine control computers are constantly "learning" about the engine. It may just need some time to adjust to the proper parameters for your current setup. Also, is the muffler you installed a louvered core or perforated core? A louvered core will add more backpressure even if it's a straight-through design. Perforated core is what you want.
07-04-2008, 10:08 AM
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My Ride: 2008 535i w/ Sports & Permium Pkg. Silv/Blk
2008 VW R32 w/Nav.
1992 VW Corrado Silv/Blk-retired
2001 530i Sports/Premium-retired
This is the down side of no-cosmetic modding, now if there is something wrong they (the dealer) will blame it on the mod, even if it's say........the fuel pump is giong bad.
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