645ci - deristriction
Discussion
I am going to be doing some autobahn miles soon (one of Hitler's more effective visions) and was wondering whether it is possible/adviseable to de-restrict the 155mph limited on my 2004 645ci which has covered 55000 miles.
I presume that it might also invalidate my BMW insured warranty?
I presume that it might also invalidate my BMW insured warranty?
REALIST123 said:
Over 155mph in an 11 year old 55K miler? Brave man........
Why? I've had my 745i de-limited and have done 162mph gps in it and it's fine. It now has 121 or 122k miles, had around 115k miles at the time. In answer to the OP it's easy enough to get the limiter removed but whether it's worth it is another matter.
minimatan said:
Yes I see thanks.
FYI, I have hit 275kph in a TTRS and 170+ mph on a Fireblade, so am more than comfortable 'making progress' on a clear stretch of Autobahn. The Germans love it too, seeing a vehicle with UK plates maxing it on their roads! Not all of them, mind...
It's not really about you being comfortable traveling at those speeds, it's more about finding a stretch of autobahn clear enough, for long enough, for the BMW to get up to those speeds.FYI, I have hit 275kph in a TTRS and 170+ mph on a Fireblade, so am more than comfortable 'making progress' on a clear stretch of Autobahn. The Germans love it too, seeing a vehicle with UK plates maxing it on their roads! Not all of them, mind...
There's a slight difference in the time and distance it takes a fireblade to wind up to 170+ mph and the time it takes a BMW 645ci!
4rephill said:
There's a slight difference in the time and distance it takes a fireblade to wind up to 170+ mph and the time it takes a BMW 645ci!
It really doesn't take that long to get up to an indicated 150mph in a 645. Obviously not modern supercar quick but I've heard it's possible on the M1 on a Saturday morning.Jayyylo said:
4rephill said:
There's a slight difference in the time and distance it takes a fireblade to wind up to 170+ mph and the time it takes a BMW 645ci!
It really doesn't take that long to get up to an indicated 150mph in a 645. Obviously not modern supercar quick but I've heard it's possible on the M1 on a Saturday morning.Don't get Me wrong, I've got no problems with anyone wanting to take the limiter off their car if they want to, or drive somewhere (legally) at the cars top speed, I just think that for the amount of times you'll actually achieve it, and for the difference it will make on a 645i, it's probably not really worth it! (I suspect that there will be very little difference between driving at 155mph and driving at the cars de-restricted top speed).
If the OP really wants to do it then I say go for it and let us know if you actually managed to drive at those speeds on the autobahn, or if you're progress hampered all the time and it turned out to be a waste of time and money.
MarshPhantom said:
Alex88 said:
REALIST123 said:
Over 155mph in an 11 year old 55K miler? Brave man........
And why would that matter? It's a fair point but if the car has been maintained and BMW intendended those parts to work beyond the limiter then you'd imagine that all will be well.
4rephill said:
It's still nowhere near as quick as a Fireblade and unless it's very early in the morning or late at night on the autobahn, chances are, something slower will pull out on the 645i before it gets to its de-restricted top speed.
Don't get Me wrong, I've got no problems with anyone wanting to take the limiter off their car if they want to, or drive somewhere (legally) at the cars top speed, I just think that for the amount of times you'll actually achieve it, and for the difference it will make on a 645i, it's probably not really worth it! (I suspect that there will be very little difference between driving at 155mph and driving at the cars de-restricted top speed).
If the OP really wants to do it then I say go for it and let us know if you actually managed to drive at those speeds on the autobahn, or if you're progress hampered all the time and it turned out to be a waste of time and money.
Not really worth it in your opinion. I found it quite nice to go faster than 155.Don't get Me wrong, I've got no problems with anyone wanting to take the limiter off their car if they want to, or drive somewhere (legally) at the cars top speed, I just think that for the amount of times you'll actually achieve it, and for the difference it will make on a 645i, it's probably not really worth it! (I suspect that there will be very little difference between driving at 155mph and driving at the cars de-restricted top speed).
If the OP really wants to do it then I say go for it and let us know if you actually managed to drive at those speeds on the autobahn, or if you're progress hampered all the time and it turned out to be a waste of time and money.
Sounds like a good idea, I would think that e maps or similar remapping people could derestrict it with a remap,I have a low mileage 645 and considered it, about £350 and you get 20-25hp increase which I doubt would make much difference but they reckon makes them more responsive, be interested to know.
E65Ross said:
Not really worth it in your opinion. I found it quite nice to go faster than 155.
So what is the de-restricted top speed of the 645i? - 160~165mph?I can't see how it is that much different to traveling at 155mph.
Is it worth paying the money to de-restrict the car for an extra 5 ~10 mph top speed that you may not be able to hit that often?
It's a personal choice, but for Me, no, it's not really worth it.
4rephill said:
E65Ross said:
Not really worth it in your opinion. I found it quite nice to go faster than 155.
So what is the de-restricted top speed of the 645i? - 160~165mph?I can't see how it is that much different to traveling at 155mph.
Is it worth paying the money to de-restrict the car for an extra 5 ~10 mph top speed that you may not be able to hit that often?
It's a personal choice, but for Me, no, it's not really worth it.
If my 745i hit 162 without much fuss a more aerodynamic 6 would definitely do 165, and more going downhill.
In my opinion, it was worth it.
I think de-restricting is not difficult but I imagine it would knacker a BMW warranty. Surprised you got one on a car of that age?
The six series is basically the definitive autobahn cruiser though.
I always remember thinking 150mph didn't seem very fast, until I did it. Current record is 160mph GPS verified (1999 911 with 80K on the clock). My 330Ci hit 150 on the clocks, no idea what that actually was. Going there next month with my Z4M, keen to see whether the limiter is hard at 155 or a little liberal.
The six series is basically the definitive autobahn cruiser though.
I always remember thinking 150mph didn't seem very fast, until I did it. Current record is 160mph GPS verified (1999 911 with 80K on the clock). My 330Ci hit 150 on the clocks, no idea what that actually was. Going there next month with my Z4M, keen to see whether the limiter is hard at 155 or a little liberal.
So.... I didn't derestrict it, but took it to Germany and the speedo exceeded the highest indicated 160mph. I can assure you that once over 150mph, things start happening very quickly indeed!
The most outstanding feature was how comfortable and composed it was - a really excellent GT car which saw me good over 4,000 miles through Europe.
The most outstanding feature was how comfortable and composed it was - a really excellent GT car which saw me good over 4,000 miles through Europe.
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