Opinions: X35d Lag

Fraser · #1 01-22-2010, 01:29 AM

Lag? What lag?

ABMW · #2 01-22-2010, 02:24 AM

Some of you appear to be confusing ignition retardation via the Traction Control System (TCS) and other onboard stability systems for Turbo-Lag.

When making a sharp right turn, from a stop, to pull out into traffic, the TCS may and stability control may retard the ignition to prevent the wheels from spinning.

Try turning it off. Traction will show on the display, indicating it's off.

Your complaints will be gone. Floor it, and the tires will spin, under the right circumstances.

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.

If that's a dangerous acceleration rate, you need to learn how to drive...

Fraser · #3 01-22-2010, 02:29 AM

Quote:

Originally Posted by ABMW

Some of you appear to be confusing ignition retardation via the Traction Control System (TCS) and other onboard stability systems for Turbo-Lag.

Diesels don't have an ignition system.

Penguin · #4 01-22-2010, 10:06 AM

Quote:

Originally Posted by Fraser

Diesels don't have an ignition system.

Well yeah, but other than that it makes sense!

scchang · #5 01-22-2010, 02:40 AM

Quote:

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.

If that's a dangerous acceleration rate, you need to learn how to drive...

The concern isn't the 0-60 time, but the delay in throttle response from standstill or very low speed. It becomes dangerous in situations where an immediate response is needed such as making a left turn ahead of oncoming traffic. I had the same issue with my E60 M5 (SMG III) which is one of the primary reasons I sold it. That car was just a wee bit quicker to 60 than the 35d.

Fraser · #6 01-22-2010, 02:46 AM

Quote:

Originally Posted by scchang

I had the same issue with my E60 M5 (SMG III) which is one of the primary reasons I sold it. That car was just a wee bit quicker to 60 than the 35d.

Aren't we talking about turbo lag or lack thereof with the 35d? The E60 M5 is just typical of a high-performance n/a petrol engine ... it needs revs to give its best

scchang · #7 01-22-2010, 02:56 AM

Quote:

Originally Posted by Fraser

Aren't we talking about turbo lag or lack thereof with the 35d? The E60 M5 is just typical of a high-performance n/a petrol engine ... it needs revs to give its best

I was just making the point that 0-60 time doesn't always accurately characterize a cars low speed acceleration. (BTW, The problem with the M5 was the transmission.) Also, I'm not sure that the lag is a result of turbo lag or gear selection.

ALPHA · #8 01-22-2010, 05:51 AM

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..

mbarrett635 · #9 01-22-2010, 06:02 PM

Quote:

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

scchang · #10 01-22-2010, 06:10 PM

Quote:

Originally Posted by mbarrett635

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

I wasn't trying to paint the picture of "imperiling the oncoming driver" absent "instantaneous warp speed". The image is very dramatic though.

I think we've all been in situations where we can safely make the turn I described factoring in our perception of oncoming traffic speed, vehicle performance, weather conditions, etc. To have a vehicle that may not predictably perform in that situation could turn a relatively safe situation into a relatively unsafe situation and that is my concern.