ACCELEARTION LAG IN NEW ML 320 ML
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Newbie
Joined: Apr 2008
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ML 320 CDI 2008
ACCELEARTION LAG IN NEW ML 320 ML
I have never owned a new automatic transmission car before (ML 320 CDI).
Why am I unable to move off
INSTANTLY from standstill after shifting from N to D,there is a 'Def lag' effect on the accelerater pedal.
Has anyone else experienced this?:
Why am I unable to move off
INSTANTLY from standstill after shifting from N to D,there is a 'Def lag' effect on the accelerater pedal.
Has anyone else experienced this?:
Super Member
Joined: Dec 2007
Posts: 898
Likes: 9
From: Woodstock, IL
His 2019 RAM Cummins Turbo Diesel Laramie; Her's 2007 ML320 CDI P3; Mine BMW R1200R
Is the lag you refer to the time for the transmission to engage when you put it in D, (that should be near instant) or is it that when in D and you step on the accelerator, there is a time to launch from a standstill?
If you refer to the later, launch time, you have a turbocharged diesel, and there will be a half second or so lag before the full 400 foot pounds of torque slams you back in your seat.
Sounds like a normal thing that you will get used to. Check your dealer if worried.
Enjoy the new ride!!! Mileage gets better with age.
If you refer to the later, launch time, you have a turbocharged diesel, and there will be a half second or so lag before the full 400 foot pounds of torque slams you back in your seat.
Sounds like a normal thing that you will get used to. Check your dealer if worried.
Enjoy the new ride!!! Mileage gets better with age.
Member
Joined: Dec 2007
Posts: 107
Likes: 13
From: Md, Fla.
2021 GLC 300 4Matic
My CDI takes a second to engage from park to drive, but I think this normal, as the transmission selector is electronic, with no mechanical connection between the selector & the transmission.
Once in drive, there will always be a short delay if you stomp on the accelerator, as the turbo spools up.
Once in drive, there will always be a short delay if you stomp on the accelerator, as the turbo spools up.
Super Member
Joined: Jan 2008
Posts: 863
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From: Chicago
Suzuki Burgman Executive
welcome to the turbo world and what you are expriencing is tubo lag, a turbo runs on exhaust gases from the engine. the turbo is like a fan, so the more exhaust gases are flowing the faster it will spin it and when you are not accelarating the turbo spins but not enough to make extra power it ionizes the air and that helps too.
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
Last edited by MB Dave; Apr 26, 2008 at 12:02 AM.
Member
Joined: Dec 2007
Posts: 107
Likes: 13
From: Md, Fla.
2021 GLC 300 4Matic
welcome to the turbo world and what you are expriencing is tubo lag, a turbo runs on exhaust gases from the engine. the turbo is like a fan, so the more exhaust gases are flowing the faster it will spin it and when you are not accelarating the turbo spins but not enough to make extra power it ionizes the air and that helps too.
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
Super Member
Joined: Dec 2007
Posts: 898
Likes: 9
From: Woodstock, IL
His 2019 RAM Cummins Turbo Diesel Laramie; Her's 2007 ML320 CDI P3; Mine BMW R1200R
ima55r2
...Was the KD box hard to install? What were your gains in hp? Any fuel mileage difference compared with normal driving?
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MBWorld Fanatic!
Joined: Jun 2002
Posts: 1,436
Likes: 11
From: Treasure Coast
2018 Mclaren 720s, 2021 Aston Martin DBX
There is one wiring connection to unhook and then connect to the kd and then plug the kd into the car. It takes a minute longer to take off the engine cover.
Haven't done a dyno so the 25% gains to hp and also torque are just claims so far...the car does feel stronger though.
As for mileage, I won't know until my next road trip. If the cdi takes a lot of miles to fully break-in as stated elsewhere, then increased mileage claims by customers might be more due to break-in than kd-box efficiency.
Haven't done a dyno so the 25% gains to hp and also torque are just claims so far...the car does feel stronger though.
As for mileage, I won't know until my next road trip. If the cdi takes a lot of miles to fully break-in as stated elsewhere, then increased mileage claims by customers might be more due to break-in than kd-box efficiency.
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Super Member
Joined: Jan 2008
Posts: 863
Likes: 2
From: Chicago
Suzuki Burgman Executive
welcome to the turbo world and what you are expriencing is tubo lag, a turbo runs on exhaust gases from the engine. the turbo is like a fan, so the more exhaust gases are flowing the faster it will spin it and when you are not accelarating the turbo spins but not enough to make extra power it ionizes the air and that helps too.
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
theyre is a lot more to this i just dont feel like typing up a a book right now
a bit exagarated video
http://www.youtube.com/watch?v=66ZH6kVKYTw
not so much exagarated its just the turbo is fairly sized on the ml320 but a 35r like on this v dub is huge
MBWorld Fanatic!
Joined: Jun 2002
Posts: 1,436
Likes: 11
From: Treasure Coast
2018 Mclaren 720s, 2021 Aston Martin DBX
My CDI takes a second to engage from park to drive, but I think this normal, as the transmission selector is electronic, with no mechanical connection between the selector & the transmission.
Once in drive, there will always be a short delay if you stomp on the accelerator, as the turbo spools up.
Once in drive, there will always be a short delay if you stomp on the accelerator, as the turbo spools up.
Almost a Member!
Joined: Dec 2004
Posts: 38
Likes: 0
From: Aptos, CA
2008 ML320 CDI
Diesel Lag
My Ml 320cdi has a lag from a standing start. I hear the engine spin up and then the transmission engages.
I think this is normal for the Diesel's, my old 97 E-class Diesel did the same thing.
The lag can be fun when you are trying to turn left across traffic when you step on it and it don't go! I've found if you keep creeping forward before hitting the accelerator, there is no pause or lag.
I think this is normal for the Diesel's, my old 97 E-class Diesel did the same thing.
The lag can be fun when you are trying to turn left across traffic when you step on it and it don't go! I've found if you keep creeping forward before hitting the accelerator, there is no pause or lag.
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,308
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From: Atlanta, GA USA
2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
Come to a quick and complete stop at a stop sign and try to take off immediately just as soon as you've stopped.
LAG! Delay.
I don't care what you call it. It's there and it can be frightening; because the truck just won't move for a second or two.
LAG! Delay.
I don't care what you call it. It's there and it can be frightening; because the truck just won't move for a second or two.
Last edited by DUTCH; Apr 30, 2008 at 06:46 AM.
Super Member
Joined: Dec 2007
Posts: 898
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From: Woodstock, IL
His 2019 RAM Cummins Turbo Diesel Laramie; Her's 2007 ML320 CDI P3; Mine BMW R1200R
Or I may just do the KD box route.
MBWorld Fanatic!
Joined: Sep 2005
Posts: 6,189
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From: Albuquerque
'10 CL550, '12 GL550
Can't be sure about these things, but I think it started with the replacement crankshaft position sensor.
Member
Joined: Dec 2007
Posts: 107
Likes: 13
From: Md, Fla.
2021 GLC 300 4Matic
Don't forget that these vehicles are drive by wire, and not a mechanical connection to the throttle & pedal, like days of old. Every drive by wire car that I've ever driven has a slight delay
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,308
Likes: 35
From: Atlanta, GA USA
2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,308
Likes: 35
From: Atlanta, GA USA
2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
I can still very vividly remember making a quick full stop at an intersection and trying to take off to beat an oncoming car. If that oncoming car hadn't applied his brakes hard, I would not have beat it. Just about had to go home to change my knickers. Been wary of those stop and quick start situations ever since.
Senior Member
Joined: Nov 2005
Posts: 429
Likes: 0
From: South Florida
2006 ML500
My ML500 has instant thrust...sometimes more than asked for by a slight jab of the pedal. However, my wife's Audi A4 1.8turbo CVT had a serious problem with initial lag. I think it was partly the CVT to blame as well as the turbo. You could floor it and it felt like you could count to 3 before anything happened. Very scary and sometimes dangerous.
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,308
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From: Atlanta, GA USA
2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
Newbie
Joined: Apr 2008
Posts: 2
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Audi & BMW
I believe this is called BTL = Brake Throttle Lag
It happens when one brakes hard or come to a complete stop and get on the gas right away. Only happens on automatic transmissions. It almost has no cure and happens with many makes and models.
If my memory serves me correct, this implementation of BTL is intentional since there was a case against an automaker (Audi?) where an old lady accidentally hit the throttle after she hit the brake very hard in the 80s. After the case, many automakers adapt this mechanism to prevent this from happening and implemented as a "safty feature".. This particular lag varies as different automakers have a different interpretation as to how much lag is considered "safe"!
It's more noticeable especially on newer cars with turbo since turbo has a non-linear accelaration. It more dangerous for turbo cars/trucks when the boost is built up for release at a lower rpm. So BTL will be longer to prevent accedents from happening. Longer BTL + Turbo lag -> Very noticeable!
This is very well documented on the Web. Search BTL or Brake Throttle Lag
However, some aftermarket crowd came out with a "black box" to bypass this mechanism (KD Box?)
JDN
It happens when one brakes hard or come to a complete stop and get on the gas right away. Only happens on automatic transmissions. It almost has no cure and happens with many makes and models.
If my memory serves me correct, this implementation of BTL is intentional since there was a case against an automaker (Audi?) where an old lady accidentally hit the throttle after she hit the brake very hard in the 80s. After the case, many automakers adapt this mechanism to prevent this from happening and implemented as a "safty feature".. This particular lag varies as different automakers have a different interpretation as to how much lag is considered "safe"!
It's more noticeable especially on newer cars with turbo since turbo has a non-linear accelaration. It more dangerous for turbo cars/trucks when the boost is built up for release at a lower rpm. So BTL will be longer to prevent accedents from happening. Longer BTL + Turbo lag -> Very noticeable!
This is very well documented on the Web. Search BTL or Brake Throttle Lag
However, some aftermarket crowd came out with a "black box" to bypass this mechanism (KD Box?)
JDN
MBWorld Fanatic!
Joined: Aug 2002
Posts: 1,308
Likes: 35
From: Atlanta, GA USA
2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
I believe this is called BTL = Brake Throttle Lag
It happens when one brakes hard or come to a complete stop and get on the gas right away. Only happens on automatic transmissions. It almost has no cure and happens with many makes and models.
If my memory serves me correct, this implementation of BTL is intentional since there was a case against an automaker (Audi?) where an old lady accidentally hit the throttle after she hit the brake very hard in the 80s. After the case, many automakers adapt this mechanism to prevent this from happening and implemented as a "safty feature".. This particular lag varies as different automakers have a different interpretation as to how much lag is considered "safe"!
It's more noticeable especially on newer cars with turbo since turbo has a non-linear accelaration. It more dangerous for turbo cars/trucks when the boost is built up for release at a lower rpm. So BTL will be longer to prevent accedents from happening. Longer BTL + Turbo lag -> Very noticeable!
This is very well documented on the Web. Search BTL or Brake Throttle Lag
However, some aftermarket crowd came out with a "black box" to bypass this mechanism (KD Box?)
JDN
It happens when one brakes hard or come to a complete stop and get on the gas right away. Only happens on automatic transmissions. It almost has no cure and happens with many makes and models.
If my memory serves me correct, this implementation of BTL is intentional since there was a case against an automaker (Audi?) where an old lady accidentally hit the throttle after she hit the brake very hard in the 80s. After the case, many automakers adapt this mechanism to prevent this from happening and implemented as a "safty feature".. This particular lag varies as different automakers have a different interpretation as to how much lag is considered "safe"!
It's more noticeable especially on newer cars with turbo since turbo has a non-linear accelaration. It more dangerous for turbo cars/trucks when the boost is built up for release at a lower rpm. So BTL will be longer to prevent accedents from happening. Longer BTL + Turbo lag -> Very noticeable!
This is very well documented on the Web. Search BTL or Brake Throttle Lag
However, some aftermarket crowd came out with a "black box" to bypass this mechanism (KD Box?)
JDN
Super Member
Joined: Dec 2007
Posts: 898
Likes: 9
From: Woodstock, IL
His 2019 RAM Cummins Turbo Diesel Laramie; Her's 2007 ML320 CDI P3; Mine BMW R1200R
What I have been doing when I need to make that quick left turn in front of traffic, or clear an intersection is hold some brake pressure with my left foot, bring the RPM's to about 1000 just before its time to go then release the brake and simultaneously stomp on the accelerator as needed. No lag there.
Do agree MB should be made aware. Will mention/demonstrate it at my next dealer visit.
Do agree MB should be made aware. Will mention/demonstrate it at my next dealer visit.
