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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 03-04-2017, 09:58 AM
Maher745li Maher745li is offline
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Location: Pakistan
 
Join Date: Mar 2017
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Mein Auto: 2004 bmw e65
Dyno and flash tune for 2004 bmw 745

Hi everyone I'm pretty new to this forum. I have 04 745li and was looking to improve its performance. Over the years cars lose horsepower and I know it's not even close to generating what it would if it were new. The car always feels a little sluggish in the 2nd gear no matter how good my launch is. I know there isn't much you can do to an N62 motor but there is a reputable mod shop here that specializes in tuning Bimmers and mercs and they told me I should get it dyno tuned and flash tuned. Are there any risks associated with flash tuning?

Last edited by Maher745li; 03-04-2017 at 10:00 AM.
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  #2  
Old 03-04-2017, 05:06 PM
g12BMW g12BMW is offline
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Location: SoCal
 
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In short yes.

And I believe the subforum you were looking for is this one: http://www.bimmerfest.com/forums/forumdisplay.php?f=126
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  #3  
Old 03-06-2017, 03:25 AM
Maher745li Maher745li is offline
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I have posted in e65 section. I would really appreciate it you elaborated on your answer in that thread. Thank you
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  #4  
Old 03-07-2017, 01:31 PM
God-Follower God-Follower is offline
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Quote:
Originally Posted by Maher745li View Post
I have posted in e65 section. I would really appreciate it you elaborated on your answer in that thread. Thank you
Was actually posted in the G12 subforum, that was why he pointed it out

Moved to E65 subforum, good luck and welcome to the forums!
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  #5  
Old 03-08-2017, 08:11 AM
Maher745li Maher745li is offline
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Location: Pakistan
 
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Hi there I wanted him to elaborate on his answer as to why flash tuning is risky. He said "in short yes" I'm guessing he has valuable information on the matter. Cheers
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  #6  
Old 03-08-2017, 10:03 PM
JBel JBel is offline
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Location: Oregon
 
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Mein Auto: 745i
Have a friend who does tunes on many cars. Looking at the HP & Torque increase on N62 engines didn't seem like it did much maybe 30HP; for the price I don't think its worth it.
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  #7  
Old 03-09-2017, 07:20 PM
Mid7er Mid7er is offline
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Mein Auto: 13 SWB Alpina B7 02 745i
Did you know you could upp the tranny torque by doing 25 second reset? It would solve that dogging feel. Also you can improve the engine performance by doing my cai retrofits. http://www.bimmerfest.com/forums/sho...039&highlight=
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  #8  
Old 03-11-2017, 11:49 AM
Maher745li Maher745li is offline
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Location: Pakistan
 
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How exactly do I do a 25 second reset? Just went thru your thread and I'm very impressed. Will head over to my mechanic and see what he can do
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  #9  
Old 03-13-2017, 09:47 AM
Mid7er Mid7er is offline
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To do a tranny adaptor reset. With foot off the brake, press the gas pedal all the way to the floor and hold for 25 seconds while turning on the ignition (again with engine turned off). Then start the engine and drive away.
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  #10  
Old 03-13-2017, 01:43 PM
FatBoy613 FatBoy613 is offline
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Location: Ontario, Canada
 
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Mein Auto: 2004 745i
Quote:
Originally Posted by Mid7er View Post
Did you know you could upp the tranny torque by doing 25 second reset? It would solve that dogging feel. Also you can improve the engine performance by doing my cai retrofits. http://www.bimmerfest.com/forums/sho...039&highlight=
I was just changing my xenon bulbs and started thinking if its possible to install the intake from the lci e65, then I come here and see you post this lol. Thats definitely the best out of the few performance mods you can do to the n62
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  #11  
Old 03-18-2017, 03:12 AM
Mid7er Mid7er is offline
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Originally Posted by FatBoy613 View Post
I was just changing my xenon bulbs and started thinking if its possible to install the intake from the lci e65, then I come here and see you post this lol. Thats definitely the best out of the few performance mods you can do to the n62
Yes my car is still running strong. I'm stoked with the midrange torque it did not have prior to dual air intake set up. Be sure to use correct maf sensor for your application. 2002 and 2003-2005 maf is different though looking the same.
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  #12  
Old 03-20-2017, 01:17 AM
Maher745li Maher745li is offline
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Location: Pakistan
 
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Mein Auto: 2004 bmw e65
What exactly is a maf sensor?
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  #13  
Old 03-20-2017, 08:57 PM
745D 745D is offline
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Location: Georgia
 
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Quote:
Originally Posted by Maher745li View Post
What exactly is a maf sensor?
MAF= Mass Air Flow sensor
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  #14  
Old 03-25-2017, 05:14 AM
Datrojan Datrojan is offline
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Location: Los Angeles
 
Join Date: Oct 2009
Posts: 62
Mein Auto: 750Li
Please don't waste a single dime trying to get additional performance out of these cars.

Everyday that you're able to start your car without white smoke coming out the exhaust or your transmission not going into fail safe mode is a blessing.

They are big cruisers. Enjoy the luxury.
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