550i horsepower shortage
03-25-2009, 06:36 AM
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My Ride: 2007 550i, Silver/Gray, Sport Package, Dinan Stage2 SW and Exhaust.
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I just had my 550i dyno-ed prior installing the Dinan S2 SW and Exhaust. It only pulled 255hp at the wheels. The dealer grabbed another 550i off the lot and it pulled 278. These cars should be pulling 280+ at the wheel if they are getting 360 at the crank. Does anyone know who took my horsepower and what I need to do to get it back?
03-25-2009, 06:56 AM
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Well, typically you lose 15-20 % between the engine and wheels....but still 255! Should be more than that even with the drive train lose 
I think mine is way off too....i've got a friend that has a bone stock '01 Maxima, and he pretty much sticks with me when we are going up the on-ramp onto the freeway after work....and those only have about 205 crank hp.
Did you get a software update? Mine feels slower after the one i got a few months back...
I think mine is way off too....i've got a friend that has a bone stock '01 Maxima, and he pretty much sticks with me when we are going up the on-ramp onto the freeway after work....and those only have about 205 crank hp.
Did you get a software update? Mine feels slower after the one i got a few months back...
03-25-2009, 07:07 AM
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Well, typically you lose 15-20 % between the engine and wheels
Even at 28% your only making around 326bhp at the crank, I would immediately suspect the MAF or the Lambda (oxygen) sensor personally.............
03-25-2009, 09:55 AM
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03-25-2009, 10:26 AM
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My Ride: 2007 550i, Silver/Gray, Sport Package, Dinan Stage2 SW and Exhaust.
2008 535i, Black on Black, Sport Package, Loaded, Stock
Previous: 2009 M3 Blue/Light Gray- Still Missed Dearly
Previous: 1972 2002 Beige/Tan- Not as good as the 1600
Previous: 1968 1600 Black/Gray 4:10 rear end- a cheap blast!
Originally Posted by radzM550i' post='826220' date='Mar 25 2009, 09:43 AM
how much did you dyno'd after the Dinan upgrade?
03-25-2009, 10:40 AM
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My Ride: 2007 550i, Silver/Gray, Sport Package, Dinan Stage2 SW and Exhaust.
2008 535i, Black on Black, Sport Package, Loaded, Stock
Previous: 2009 M3 Blue/Light Gray- Still Missed Dearly
Previous: 1972 2002 Beige/Tan- Not as good as the 1600
Previous: 1968 1600 Black/Gray 4:10 rear end- a cheap blast!
Originally Posted by DD_545i' post='826451' date='Mar 25 2009, 12:55 PM
That's a worrying comparison only if an '01 Maxima weighs the same as your car. I doubt it does. You want to compare the BHP/Ton figures which I imagine are a lot closer than you might expect.
That's not unsual - they often choose to change certain settings to reduce stresses after several years of seeing what problems the engines have had.
That's not unsual - they often choose to change certain settings to reduce stresses after several years of seeing what problems the engines have had.
03-25-2009, 11:25 AM
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Originally Posted by DD_545i' post='826451' date='Mar 25 2009, 12:55 PM
That's a worrying comparison only if an '01 Maxima weighs the same as your car. I doubt it does. You want to compare the BHP/Ton figures which I imagine are a lot closer than you might expect.
03-25-2009, 11:42 AM
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Originally Posted by ktlocklear' post='826550' date='Mar 25 2009, 03:25 PM
Well based on the "advertised" zero to sixty times between the 2...the 550 should be a lot quicker than a 5th gen Maxima...and I should being seeing my co-worker's front end in my mirror during a 25-70mph pull, which i'm not
03-25-2009, 11:47 AM
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Originally Posted by zen68' post='826564' date='Mar 25 2009, 02:42 PM
Hmm... This is strange, perhaps you should have your car checked out. My friend has a 2002 Maxima SE (stock) and I easily pull at least a couple of car length on him every time he tries to mess with me