Electronically Limited Top Speed

[BenzedUP]

What would a 2005 E320 CDI go up to?

When you approach the higher speeds I don´t get the feeling that it will go and go.

What engine does it have the 3.2 I6 or the 3.0 V6?

Mine use to be like that, very quick off the lights but once it gets into fourth gear speedo starts moving abit slow...

Not any more though after I had the car's ECU remaped, it flys, it gets to 120 in no time and keeps on pulling very well after...

From 25mph to about 60ishmph it jumped about 1 car ahead of my friends E46 M3 SMG.

I think your car needs a good remap!

 

[BenzedUP]

Ask BD , not me ....

I gather they are all worked out on standard trim and rolling radius.

BD will be able to explain it better than me.

You'll need to come up with the cross section , track and Cd too ...

Ok thanks, i'll ask him.

 

[orangeboy]

What engine does it have the 3.2 I6 or the 3.0 V6?

Mine use to be like that, very quick off the lights but once it gets into fourth gear speedo starts moving abit slow...

Not any more though after I had the car's ECU remaped, it flys, it gets to 120 in no time and keeps on pulling very well after...

From 25mph to about 60ishmph it jumped about 1 car ahead of my friends E46 M3 SMG.

I think your car needs a good remap!

It´s a 3.2 I6. I haven´t floored it to the absolute max.

It does have incredible acceleration, which is what you need, but it´s nice to know it has some top end as well.

Is it a diesel thing to struggle top end?

I had a 2.4 V6 Petrol Audi A4, and it would just go and go.

 

[BenzedUP]

I don't think it's a diesel thing to struggle at top end, i'm not sure but your CDI should be alot quicker than the Audi at any speed..

Audi A4 2.4 V6 only has weedy 160bhp and 230nm torque you can't compare!

 

[orangeboy]

Do you know what I think it is?

I think there is a lot left in the tank at high speed, but because it´s a diesel, the noise gives the impression that it´s reaching it´s max.

Need to head out to Germany!! ha

It is certainly a lot quicker than the Audi- frighteningly quick when you first drive it!! That´s what we like!!

 

[stevesey]

Where did the Torque figures go? don't you put that into account? Also wheel size can effect the top end speed? etc..

The calculation probably assumes the car is geared* to achive top speed at the peak power point (and as torque is just 5252*power/rpm it's not needed). *Hence gear ratios and wheel/tyre sizes are excluded also as they are just part of the overall gearing.

 

[Colin_b]

Although I am extremely interested surely no one is going to give an accurate answer here?
Maybe you could work out a rough estimate by hitting the rev limiter in 6th?

The limiting can be turned off (rolling road diagnostic mode). An SLK 350 will do, allegedly, around 170-172 eventually.

 

[Alps]

or using MB star ... only on some cars though

 

[Bobby Dazzler]

Catching up with a few bits after a few days away from the PC. I'll come back and explain more - and let you know what the theoretical top speed is for the cars mentioned above.

 

[LTD]

Bobby

If you have the time and inclination, I would be interested to find out what the theoretical top speed for my W220 would be.

 

[Bobby Dazzler]

LTD - no problem if you can get me the information Howard posted further back in this thread.

 

[mbenz76]

Catching up with a few bits after a few days away from the PC. I'll come back and explain more - and let you know what the theoretical top speed is for the cars mentioned above.

Thanks Bobby Dazzler. As per my OP I am interested in the new E350 CDI Saloon.

 

[Diesel Benz]

Thanks Bobby Dazzler. As per my OP I am interested in the new E350 CDI Saloon.

If any theoretical calculations were given, it would be nice to "calibrate" those against the E250CDI that has a 149 mph top speed, likely the car with the max speed closest to 250 km/h and not limited.

 

[LTD]

LTD - no problem if you can get me the information Howard posted further back in this thread.

Got a few bits of data from the interweb. Can anyone help me fill in the blanks ?

W220

transmission losses ?18%
engine power (at the flywheel) 306BHP
engine power (at the wheels) 251 BHP @ 18% loss
vehicle track 1574mm
vehicle height 1444mm
maximum vehicle cross section
vehicle mass (weight) (kg) 1855kg
drag coefficient 0.26

 

[Bobby Dazzler]

Got a few bits of data from the interweb. Can anyone help me fill in the blanks ?

W220

transmission losses ?18%
engine power (at the flywheel) 306BHP
engine power (at the wheels) 251 BHP @ 18% loss
vehicle track 1574mm
vehicle height 1444mm
maximum vehicle cross section
vehicle mass (weight) (kg) 1855kg
drag coefficient 0.26

Thanks. I'll fill in the blanks.

 

[prprandall51]

It would be interesting to compare BD's calculated / theoretical top speed of my 1976 Mini 1000 against the actual speed I achieved when I used it at a special high speed testing facility*.

There, under optimum conditions** I achieved an awesome 74mph.

* Test facility: The Croydon Flyover
** Optimum conditions: Prior to the max speed run, I used an angle grinder to remove the large chunks of rust from the wings and bottoms of the doors, which were weighing the car down.

 

[Bobby Dazzler]

The E350 CDI I am waiting for (patience is definately not one of my virtues ) has a top speed of 155mph (to which it is electronically limited).

My question is what do people think it could actually achieve were it not limited?

Source of values used: 2009 Mercedes-Benz E 350 CDI BlueEFFICIENCY technical specifications and data - 4 door 3 litre (2987 cc) V6 230.7 PS - Carfolio.com car specifications pages

transmission losses 18%
engine power (at the flywheel) 227.5 BHP
engine power (at the wheels) 187 BHP
engine power (at the wheels) 139 kW
vehicle track 1.604 m
vehicle height 1.465 m
maximum vehicle cross section 2.11 m*m
vehicle mass (weight) (kg) 1825 kg
air density 1.202 kg/(m*m*m)
drag coefficient 0.25

Theoretical top speed of 2009 W212 E350 CDi BlueEfficiency is 156 mph.

Good job it's limited, eh??!!

NB: Maximum vehicle cross section is a reasonable approximation in the absence of an actual value.

 

[Deleted member 6183]

It would be interesting to compare BD's calculated / theoretical top speed of my 1976 Mini 1000 against the actual speed I achieved when I used it at a special high speed testing facility*.

There, under optimum conditions** I achieved an awesome 74mph.

* Test facility: The Croydon Flyover
** Optimum conditions: Prior to the max speed run, I used an angle grinder to remove the large chunks of rust from the wings and bottoms of the doors, which were weighing the car down.

You feckless hooligan!

BTW I got my horsesh!t brown mini 1000 up to 85 on the M4 at Margam every Sunday night of 1985 with the aid of a small steering wheel and a lowered steering column.

 

[mbenz76]

Theoretical top speed of 2009 W212 E350 CDi BlueEfficiency is 156 mph.

Good job it's limited, eh??!!

Good job indeed - that 1mph could be the death of me!

Thanks for working it out though - much appreciated.

It does beg the question, what's the point limiting it, and if they are doing it for safety reasons (or to show they are "doing their bit") then why not limit it to something much closer to the speed limit?

 

[prprandall51]

You feckless hooligan!

BTW I got my horsesh!t brown mini 1000 up to 85 on the M4 at Margam every Sunday night of 1985 with the aid of a small steering wheel and a lowered steering column.

Everyone knows that a small steering wheel is good for at least 6mph and, as a result, your car must be deemed "race prepared".

I bet you're the kind of cheater who also used a clothes peg to stop the choke from popping back in - another sly tuning trick I have seen done to squeeze that little bit extra out of the A series.