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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > F07 Gran Turismo (2010 - Current)

F07 Gran Turismo (2010 - Current)
The 5 Series Gran Turismo -- now available in the USA as a 535i, 550i and 550i xDrive model.

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  #1  
Old 05-16-2013, 10:57 AM
RedRX RedRX is offline
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Location: Colorado
 
Join Date: Oct 2012
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Mein Auto: 2002 ML500
Took my 550 GT to the Drag Strip

Because I have a history of owning performance-oriented cars and I was curious about my GT, I decided to take a trip to our local drag strip last night to see what my car could do. Here are the details:

Car: 2011 550 GT xDrive, bone stock, 7.9K miles
Weight: 5,025 lb per the scale at the strip, with me in the car
Strip: Bandimere Speedway, Morrison CO, 5,800 feet above seal level, 60 degrees F
Best 1/4 ET and trap: 13.24 @ 105.2 mph

Although I know that turbochargers can compensate for the lower air density we have in Colorado (about 20% less air mass per unit volume as compared to sea level), I was honestly surprised by how well the car ran. I know that some magazines have run GTs in the mid-13s at 105ish, but those tests are always conducted at much lower altitudes.

I made three passes in all, the first two were 13.30 at 104.x. I did manage a 1.894 second 60' time on the 13.2 second pass thanks to the AWD. I can post the time slip if anyone is interested.

Anyway, it was a fun and interesting night, and I thought that readers of this forum might appreciate some data on how the GT runs. Incidentally, a 13.2 second car is considered to be respectably quick at this altitude.

One more thing. There was an X6 M running last night. The owner wasn't launching/driving the car "properly" and was running mid-high 13s at 106 - 107.

Last edited by RedRX; 05-16-2013 at 01:02 PM.
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  #2  
Old 05-16-2013, 12:06 PM
Ductordoc Ductordoc is offline
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Mein Auto: 2013 550i xDrive GT
Sounds like a good time. I may do a similar night once my car arrives. Thanks for the post.
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  #3  
Old 05-17-2013, 08:17 AM
WiseYoda WiseYoda is offline
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Location: Pittsburgh, PA
 
Join Date: May 2013
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Mein Auto: 2011 BMW 550i GT (F07)
Nice! Thanks for the info. Been looking for actual 1/4 times around the forums. Quick question, what tires are you running?
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  #4  
Old 05-17-2013, 08:26 AM
RedRX RedRX is offline
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Location: Colorado
 
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Quote:
Originally Posted by WiseYoda View Post
Quick question, what tires are you running?
My car is equipped with the Sports package and 20" wheels, and I'm running the OE tires. I've never actually looked at them, so I can't say what they are. If you'd really like to know, send me a message or reply to this thread and I'll get the details for you.

BTW, an AWD 550 GT at sea level, driven hard, might be able to manage a 12.9x in stock trim. With the updated 445 hp motor, I'd call it a foregone conclusion.
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  #5  
Old 05-17-2013, 10:57 AM
jadnashuanh jadnashuanh is offline
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If the overpressure valve on the turbos is opening, not sure if the altitude really matters...it's stuffing as much air as the engine can handle once that happens. Now, I'm not sure the BMW engines actually have an overpressure valve in them, but most designs do. And, since the air is thinner, there's less wind resistance, and in a turbo engine, it might go faster at high altitudes! Probably not, as the turbos spool up, it would take longer to get to the overpressure situation so it won't be at max boost as long, but don't know.

Anybody know?
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  #6  
Old 05-17-2013, 01:50 PM
RedRX RedRX is offline
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Location: Colorado
 
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Quote:
Originally Posted by jadnashuanh View Post
If the overpressure valve on the turbos is opening, not sure if the altitude really matters...it's stuffing as much air as the engine can handle once that happens. Now, I'm not sure the BMW engines actually have an overpressure valve in them, but most designs do. And, since the air is thinner, there's less wind resistance, and in a turbo engine, it might go faster at high altitudes! Probably not, as the turbos spool up, it would take longer to get to the overpressure situation so it won't be at max boost as long, but don't know.

Anybody know?

While I'm not familiar with the details of the boost control on an N63, I'm fairly certain that it's done the traditional way, via the turbo wastegates. What I don't know is whether or not the ECU modulates the duty on the WG in an effort to achieve some pre-determined absolute manifold pressure, or if the duty on the WG is simply pre-programmed - or if some other method is used to determine WG duty cycle. At the end of the day, though, it's clear that my car is only slightly down on power compared to a similar car operating at sea level.

Incidentally, because I sit on the brake in the staging lane, and the stock stall on our transmission is about 3,100 RPM, I'm leaving the line at full boost. That's the reason the car comes out of the hole so well. Further, I manually shift the car, as I believe it's advantageous to shift before redline, because it seems that the stock program has a tendency to pull timing or otherwise reduce power slightly between shifts. By manually shifting at about 6300 rpm, I pick up the next gear instantly with no loss in boost pressure (the engine remains under load the entire time) and with no timing retardation.

I should note that I need to test this theory by doing a couple runs where I allow the ECU to shift automatically at redline to see if doing so positively or negatively affects my performance. I see another track day in my future...
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  #7  
Old 05-30-2013, 05:43 AM
gmblack3 gmblack3 is offline
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Thanks for the info. Sounds like a fun time.
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  #8  
Old 05-30-2013, 09:45 AM
RedRX RedRX is offline
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Incidentally, I went back to the track last night, this time with a Burger JB installed.

My best ET of the night was 13.064 @ 105.98
My best Trapof the night was 13.079 @ 106.44

Most of my launches were quite good, in the low 1.8 second range.

I believe that the car would have gone 12.9x, but I was driving directly into a 15 mph headwind all night. Also, I'm still improving my driving skills, and haven't yet identified the optimal shift points.

I'm sure that I'll head back to the strip at least once more this year. I need that 12 second slip!
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  #9  
Old 06-04-2013, 09:33 PM
trekwars2000 trekwars2000 is offline
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Are you doing it on that speedway I pass on the left side of the interstate as I head north from Deer Creek to I70?

I am in town every other month or so from Vegas with work on the SW side of Denver and in Aurora and would love to ride and see your GT.

My wife and I are so close to trading our 06 7 for a new 5GT and would love to see more about it... Please let me know if you are going to the trade in the next three weeks. It looks like I will be in Denver next week for two days and the last week of the month all week.
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  #10  
Old 06-05-2013, 08:55 AM
RedRX RedRX is offline
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Location: Colorado
 
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Quote:
Originally Posted by trekwars2000 View Post
Are you doing it on that speedway I pass on the left side of the interstate as I head north from Deer Creek to I70?

I am in town every other month or so from Vegas with work on the SW side of Denver and in Aurora and would love to ride and see your GT.

My wife and I are so close to trading our 06 7 for a new 5GT and would love to see more about it... Please let me know if you are going to the trade in the next three weeks. It looks like I will be in Denver next week for two days and the last week of the month all week.
Yes - I'm making my passes at Bandimere Speedway, which is on the west side of C470, just south of I-70.

If the weather holds out, I'm thinking about heading to the track tonight. Should the event be canceled due to rain this evening, I may try again next Wednesday. If you're around, I'd be happy to let you take a look at my GT - you can even ride along for a pass if you'd like.
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  #11  
Old 06-06-2013, 03:57 PM
DINAN_GT DINAN_GT is offline
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Location: NJ/NY
 
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Mein Auto: BMW 550i GT DINAN Stg 3
I want to take mine to the drag strip but just I have not had time...

With DINAN Stage 2 and a Muffler Delete I know I'll be well in the 12s, especially since it can clock 0-60 in 3.9s
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  #12  
Old 06-06-2013, 06:46 PM
RedRX RedRX is offline
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Location: Colorado
 
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Quote:
Originally Posted by DINAN_GT View Post
I want to take mine to the drag strip but just I have not had time...

With DINAN Stage 2 and a Muffler Delete I know I'll be well in the 12s, especially since it can clock 0-60 in 3.9s
What are you waiting for!!! Given that I almost ran 12s in a stock 2011 GT at 5800 feet ASL, 12's in your car are a foregone conclusion. When you do go, be sure to post the results.
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  #13  
Old 08-12-2013, 11:41 AM
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badblack550xi badblack550xi is offline
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Quote:
Originally Posted by DINAN_GT View Post
I want to take mine to the drag strip but just I have not had time...

With DINAN Stage 2 and a Muffler Delete I know I'll be well in the 12s, especially since it can clock 0-60 in 3.9s
womp womp
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  #14  
Old 08-12-2013, 11:48 AM
DINAN_GT DINAN_GT is offline
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Quote:
Originally Posted by badblack550xi View Post
womp womp
Definitely a womp womp LOL

But at least it still run stock times
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