550i horsepower shortage
Thread Starter
Members
Joined: Jul 2008
Posts: 7
Likes: 0
From: Dallas, Texas
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 Richard in NC' post='826717' date='Mar 25 2009, 05:34 PM
On M5's the Mass Airflow Sensor was the most likely cause of HP loss in an otherwise "healthy" car. Do you run a K&N oiled filter or drive on dirt roads alot? That can contaminate the MAFS. How many miles are on the car?
Also on the dyno chart, did it have a "normal" HP & Torque curve or did it have peak HP much lower than the 6300 RPMs it should?
Also on the dyno chart, did it have a "normal" HP & Torque curve or did it have peak HP much lower than the 6300 RPMs it should?
Thread Starter
Members
Joined: Jul 2008
Posts: 7
Likes: 0
From: Dallas, Texas
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 rockfish' post='839654' date='Apr 7 2009, 05:21 PM
The car has the stock air filter and induction system. It has 25K miles and only drives in city areas. The horsepower max occured close to redline and look normal with repect to the torque curve.
Contributors
Joined: Mar 2009
Posts: 959
Likes: 0
From: SoCal- SFV (Land of pimps, drug dealers, money, hot cars and hot wimmenz...this ain't no movie bitch, mess with us and we'll cut ya!)
Who does baseline dyno testing here in SoCal on BMWs?
Mine doesn't feel too fast either and I have 10k on mine...should I spray the MAF to clean it?
Mine doesn't feel too fast either and I have 10k on mine...should I spray the MAF to clean it?
Contributors
Joined: Mar 2009
Posts: 959
Likes: 0
From: SoCal- SFV (Land of pimps, drug dealers, money, hot cars and hot wimmenz...this ain't no movie bitch, mess with us and we'll cut ya!)
Well, I called RPI and they're saying that the average for a stock 550i is ~250. This is on their dyno and they claim to have dynoed quite a few 550i over the past year. I'm going to call them on Monday of next week to schedule a baseline run to see if mine dynos in this range and then perhaps just go ahead with the air + tune mod with an after dyno.
I'll keep you guys posted.
I'll keep you guys posted.
Members
Joined: Aug 2008
Posts: 2
Likes: 0
From: Missouri
My Ride: 2009 550i // Sports Package // Cold Weather // Side Airbags // 6Spd MT // iPod // Carbon Black //
I have an 09 550i. I intend on going the Dinan route as well but the car only has 6000 miles thus far. I will see if
I can find a Dyno shop around me to run the car to see what Im pushing to add in. As far as quick Im extremely
happy with the car. I purchased the car while stationed in Germany and the car gave a S5 a run for its money on
the Autobahn.
Jimmy
I can find a Dyno shop around me to run the car to see what Im pushing to add in. As far as quick Im extremely
happy with the car. I purchased the car while stationed in Germany and the car gave a S5 a run for its money on
the Autobahn.
Jimmy
Senior Members
Joined: Mar 2007
Posts: 1,517
Likes: 0
From: North Carolina, USA
My Ride: 2008 BMW 550i
2006 BMW X3
Originally Posted by El Immigrante' post='839769' date='Apr 7 2009, 07:42 PM
Well, I called RPI and they're saying that the average for a stock 550i is ~250. This is on their dyno and they claim to have dynoed quite a few 550i over the past year. I'm going to call them on Monday of next week to schedule a baseline run to see if mine dynos in this range and then perhaps just go ahead with the air + tune mod with an after dyno.
I'll keep you guys posted.
I'll keep you guys posted.
Contributors
Joined: Mar 2009
Posts: 959
Likes: 0
From: SoCal- SFV (Land of pimps, drug dealers, money, hot cars and hot wimmenz...this ain't no movie bitch, mess with us and we'll cut ya!)
Originally Posted by Richard in NC' post='839813' date='Apr 7 2009, 05:18 PM
That seems low. A 20% loss would be 290hp. I'd be disappointed if lower than that. The typical E39 M5 dyno was 330-340hp. The 550i is only 34 less hp.
Contributors
Joined: Jun 2007
Posts: 470
Likes: 0
From: Washington DC Suburb
My Ride: '07 550i with SP, Nav, Logic7
Originally Posted by El Immigrante' post='839769' date='Apr 7 2009, 07:42 PM
Well, I called RPI and they're saying that the average for a stock 550i is ~250. This is on their dyno and they claim to have dynoed quite a few 550i over the past year.
250 whp is low for the 550i if you ask me.
http://forums.e60.net/index.php?showtopic=71894
Contributors
Joined: Dec 2008
Posts: 2,306
Likes: 0
From: Temecula, Ca
My Ride: '10 Switzer "Ultimate Street Edition" GT-R
Originally Posted by zen68' post='840056' date='Apr 7 2009, 09:11 PM
This is strange. Here is the thread RPI dynoed a 545i and it produced 250 whp before the new exhaust was installed.
250 whp is low for the 550i if you ask me.
http://forums.e60.net/index.php?showtopic=71894
250 whp is low for the 550i if you ask me.
http://forums.e60.net/index.php?showtopic=71894
Members
Joined: Oct 2008
Posts: 236
Likes: 0
From: Socal
Originally Posted by El Immigrante' post='839769' date='Apr 7 2009, 04:42 PM
Well, I called RPI and they're saying that the average for a stock 550i is ~250. This is on their dyno and they claim to have dynoed quite a few 550i over the past year. I'm going to call them on Monday of next week to schedule a baseline run to see if mine dynos in this range and then perhaps just go ahead with the air + tune mod with an after dyno.
I'll keep you guys posted.
I'll keep you guys posted.