Opinions: X35d Lag

[ALPHA]

I don't know if its the turbo or the transmition, but there is a lag for me... especially when i floor it, completely remove my foot from the pedal and then floor it again... on very low rpm there is also a lag but I think this is because the turbo starts from 1800 rmp.... so it would be natural from a stand still to feel this lag especially in 2nd gear.Try to accelerate with 1800-2000 rmp ( left foot brake) and you are going to feel the difference. its much better to drive the in Manual mode..

[ALPHA]

Originally Posted by wch X5

I went from a 4.8 to a 3.5d and really haven't noticed any real difference (except the much better gas mileage ).

Since you were driving a 4.8 can you please share with us which of the two feels better when driving, which in your opinion is faster(or feels faster) and in general did you regret going from petrol to diesel.

[rh71]

For those who think it's turbo lag... the lag that occurs when you're at low speed then try to accelerate (such as when slowing down for a turn then mashing it)... this occurs on a 3.0si (and I'm sure 4.8i) as well... and I've heard of it on M3s. So it's not just turbos or diesels. Same with the acceleration from stop. What I'd like to hear is which BMWs from recent history DON'T have this problem.

[Penguin]

Originally Posted by Fraser

Diesels don't have an ignition system.

Well yeah, but other than that it makes sense!

[ranchhand]

I have owned both the 3.0 and the 35d and neither will get out of it's own way in an emergency.
The slight lag during normal acceleration is only an inconvenience.

[ABMW]

Originally Posted by rh71

For those who think it's turbo lag... the lag that occurs when you're at low speed then try to accelerate (such as when slowing down for a turn then mashing it)... this occurs on a 3.0si (and I'm sure 4.8i) as well... and I've heard of it on M3s. So it's not just turbos or diesels. Same with the acceleration from stop. What I'd like to hear is which BMWs from recent history DON'T have this problem.

Yes, this is what I too mentioned. Many are confusing the systems multiple stability control systems for turbo lag.

The car has internal gyroscopes. It knows when your in the middle of a turn, and it knows when flooring it would result in a tail spin (FOR MOST DRIVERS).

For the rest of us, who are enthusiasts this can be annoying. Hence, you can turn of part of the stability control on the X5, but not completely.

If BMW tuned their computers to be over aggressive with their throttle retardation, I won't complain with that statement.

But, again, I don't believe what some of you are experiencing is turbo lag.

The only way you can really find out what the turbo-lag is on the vehicle, is to find a dry piece of pavement. Turn off the Traction Control, and floor it.

You may get some wheel spin or a chirp from the rear, but you'll also notice the turbo lag may be less than what you remember.

Though, testing turbo lag, from a stop when making a right hand into the flow of traffic is a very bad test. I've done the same thing with a 911 Turbo, and the vehicle nearly shut down, until it figured out it was not in an uncontrolled spin, and it was "okay" for the vehicle to allow full power to me, the driver at the time.

That incident had nothing to do with the Turbo, but with the onboard stability systems.

I'm not saying there is ZERO lag. I'm not sure of any vehicles, save for maybe the Bugatti Veyron (correct my spelling) that have imperceptible lag. But, unfortunately guys and gals, this is not a a sports car. It's not your average SUV or SAV for that matter, but there is going to be "some" lag.

Quite honestly, there's no car that I've ever driven that's been turbo-charged that has been so finely tuned that I've not been able to notice lag. Some have more lag than others, but the 35d is far from the point where it should be generating the level of complaints that some are bringing up here in this thread.

It's just simply not that bad, and is on par with many current production vehicles, including real sports vehicles, that I've driven in recent times.

You're free to disagree, and the above OBVIOUSLY represents only my personal opinion and experience with the vehicle.

[chilliwilli]

Originally Posted by ABMW

...

The lag is FAR from dangerous. This vehicle accelerates from 0-60 in 6.2 seconds, and many reputable testers are getting numbers below that.

...

I'd love to see a link with that number...it's more in the lower 7's with potential upper 6's if one knows what they're doing. IMO, 6.2 seconds to 60mph would require considerable tuning, boost etc...Some have provided methods to negate lag...i.e. S mode. Some have installed sprintbooster and swear by it...but all it does is eliminate lag not improve data.

You want zero turbo lag...start with the X5M or X6M.

[rh71]

when magazines do their tests, is it always in normal D mode so all vehicles are on an even field or do they use the tuned sports modes to maximize results?

[santo]

It would be cool if there was a boost gauge in iDrive so that those who think it is turbo lag would know for sure. I drove a twin turbo car with a boost gauge and you knew when the power was coming or when the turbos were in use during spirited driving.

[mbarrett635]

Originally Posted by scchang

It becomes dangerous in situations where an immediate response is needed such as making a left turn ahead of oncoming traffic.

I'm sorry, but you shouldn't be turning left in front of oncoming traffic unless you know you have enough time to make the turn without imperiling the oncoming driver. If you have to have instantaneous warp speed to do that, you are at best inconsiderate, and at worst, a dangerous driver. My $.02