550i feels like it has turbo lag
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OP, get the sprintbooster.. i too have the 550 and it DOES have that lag you speak of. Incredibly annoying for this type of car, but in order to get rid of it you should just get the sprintbooster. After that its almost non-exsistent.
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From: San Diego, CA
My Ride: 2008 550i Sport (6-speed)
OP, I too have a MT 550i, I had the CDV (Clutch Delay Valve) tapped open. That seemed to have helped with the acceleration issue. It most certainly has made the MT much more enjoyable to drive. The "Sprint Booster" type device is my next mod. Hopefully this delay in acceleration will disappear - it seems by all who have installed this device to have eliminated the delay.
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My Ride: Alpine White 2006 530Xi (SLD)
Without SB your default signal (signal before you press it at all) from the gas pedal is 0.
With the SB the default signal will be greater than 0, thereby decreasing the amount of time it takes the car to react. (In terms of percentage, this is an increase of "infinite proportions" btw
)The difference is minuscule in terms of any possible damage from this, nor is it really noticeable, but when it comes to moving the car off the line - its day and night vs. stock.
OP, I too have a MT 550i, I had the CDV (Clutch Delay Valve) tapped open. That seemed to have helped with the acceleration issue. It most certainly has made the MT much more enjoyable to drive. The "Sprint Booster" type device is my next mod. Hopefully this delay in acceleration will disappear - it seems by all who have installed this device to have eliminated the delay.
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My Ride: | 2006 550i | Silver Gray Metallic | Sport Package | 6-speed MT | Logic7 | NAV | CWP | Tan Dakota Leather | Stock 124s | 35% tint |
i can see how my initial message could have been misinterpreted.
I am clear that neither my 550 nor my prior 540 have turbos. I was using this to illustrate the feel of the rush of power I have in 550 that is not immediate. There is a slight pause before the torque kicks in. It feels a bit like my old TT audi s4.
I am clear that neither my 550 nor my prior 540 have turbos. I was using this to illustrate the feel of the rush of power I have in 550 that is not immediate. There is a slight pause before the torque kicks in. It feels a bit like my old TT audi s4.
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My Ride: | 2006 550i | Silver Gray Metallic | Sport Package | 6-speed MT | Logic7 | NAV | CWP | Tan Dakota Leather | Stock 124s | 35% tint |
+1. I also had an E39 540I Sport and it was a lot stronger off the line than my 550. This is a result of the throttle lag delay om the E60's thottle by wire system and transmission gearing. The E39 540I Sport in 2003 at least had a final drive ratio for all out acceleration -- fuel economy be damned.
This was the explanation I was looking for! I knew I had seen something about this in the past.
Thanks for the insight - and to all who responded.
I had gotten pretty used to this, and I was reasonably determined to keep my car as stock as possible. However I am leaning a bit toward the sprint booster now if it can eliminate the delay.
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My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
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This was the explanation I was looking for! I knew I had seen something about this in the past.
Thanks for the insight - and to all who responded.
I had gotten pretty used to this, and I was reasonably determined to keep my car as stock as possible. However I am leaning a bit toward the sprint booster now if it can eliminate the delay.
Thanks for the insight - and to all who responded.
I had gotten pretty used to this, and I was reasonably determined to keep my car as stock as possible. However I am leaning a bit toward the sprint booster now if it can eliminate the delay.
BTW, I would DEFINITELY get the Sprint Booster as it makes a big difference in response, along with being completely reversible too!
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I have to agree with Gene...(I noticed he posted THIS time!) try the 25 second transmission reset trick, it will give you an IMMEDIATE improvement and will keep your car in the stock configuration too! BTW, I would DEFINITELY get the Sprint Booster as it makes a big difference in response, along with being completely reversible too!
BTW, I would DEFINITELY get the Sprint Booster as it makes a big difference in response, along with being completely reversible too! 
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My Ride: SOLD...Jet Black 2008 550i M Sport with SAT, black interior. RPI exhaust and air scoop, 35% huper optik tint all around, CF roundels, flat black kidneys, Springfield Armory XD-40 jet black in glove box, charcoal filter removed.
I say, "Just say NO to the Sprint Booster!" It only affects the feel of the pedal and has absolutely NO affect on throttle response, decreased lag, etc. Just push the pedal a little harder and you get the same results as the SB. I understand the need of those who have it to keep drinking the koolaide and saying it really makes a difference blah blah blah, but really, think about what its doing. And there are some very respected and long time members who have it and swear by it - I still respect them and there opinions, just not on this one.
Don't believe it, read this http://peony888.com/VS/SprintBooster.pdf
Just my two cents on this OVERLY EXPENSIVE damn near useless mod. Then you have to worry with taking it off when the car goes in for service, putting it back on, etc etc.
Save your money for another mod that doesn't do anything, but at least looks cool, like a roof spoiler or something.
Don't believe it, read this http://peony888.com/VS/SprintBooster.pdf
Just my two cents on this OVERLY EXPENSIVE damn near useless mod. Then you have to worry with taking it off when the car goes in for service, putting it back on, etc etc.
Save your money for another mod that doesn't do anything, but at least looks cool, like a roof spoiler or something.