8000RPM Redline for Z4M?

[O-cha]

Originally Posted by exdos

You've previously said to me: "Your numbers are meaningless" because OBD datalogging produces time-stamped data at just over 0.5 secs intervals for 4 PIDs.

YOUR shitty datalogger samples at that rate, I have one that measures much faster than that, as well as OEM stuff that measures even faster than that (but doesn't graph). If you had a different attitude I might have taken a couple hours out of my day to reinstall the logger and graph it, but I have no desire to do your bidding.

Originally Posted by beta

I give up. You're obviously more interested in talking about the particulars of my completely made up example, rather than understanding the underlying point I was trying to make.

O-cha, if your'e still around, how do the ITBs fit into all of this?

What about them? They are all locked in synch and they don't really oscillate at all. The logic I know of that ignores the foot pedal is on sharp throttle closings, in gear, the ECU will buffer the closing to protect the connecting rods. Then also what exodus thinks for no real reason but is true, that the throttle will begin to close before the limiter in anticipation.

What most people feel though is just torque falling off, that's just the dynamics of nearly every engine out there. Doesn't mean you should shift though. S54s rev-limiter on every shift, if it's something like a 335 where torque falls on it's face there is an advantage in later gears to shifting before the limiter.

[O-cha]

Originally Posted by exdos

I have simply found ways of achieving this using well known "science".

Fixed.

[exdos]

Originally Posted by mfanatic325

Use a universally-accepted/well-known datalogging software suite and recheck your numbers. Then we can all believe your claims.

Which datalogging suite is universally accepted? Can you recommend one?

In the past, I've tried many different laptop applications with ELM327 and OBDII interface and establishing permanent connectivity is a real problem with many of these applications.

The DashDyno doesn't suffer from connectivity problems.

The problem of all OBDII datalogging appears to be that the sampling rate is limited by the ECU of the vehicle rather than datalogging software/DashDyno. I've found that the sampling rate from BMW vehicles is less than that of, say, Ford or Citroen, therefore the sampling rate is limited by the vehicle manufacturer. I would like to know if anyone has discovered a way of OBDII datalogging a BMW vehicle with a sampling rate of greater than 8 samples per second of a single PID?

[exdos]

Originally Posted by O-cha

YOUR shitty datalogger samples at that rate, I have one that measures much faster than that, as well as OEM stuff that measures even faster than that (but doesn't graph).

Which datalogging equipment do you use? Please can you give any useful links to this? Does your equipment datalog OEM PIDs or does it require the installation of individual monitoring devices?

[mfanatic325]

I've never done research on dataloggers, but I'm sure plenty of guys can chime in and provide you with recommendations.

[O-cha]

Originally Posted by exdos

Which datalogging equipment do you use? Please can you give any useful links to this? Does your equipment datalog OEM PIDs or does it require the installation of individual monitoring devices?

Oem stuff, but autoengenuity or bavarian technic would do much better for you.

[beta]

I recommend you get DSS running with bmtechnic, which will allow you to Test your Vanos.

For datalogging, I've been meaning to try bmwlogger 2, now that I have the cable from bm technic.

[exdos]

Originally Posted by O-cha

Oem stuff, but autoengenuity or bavarian technic would do much better for you.

I've taken a look at the Autoenginuity website and this is what it says in the FAQs:
"What update rates can I expect?

The biggest variable in this answer is the vehicle. Older cars will do between 4 - 6Hz with generic OBDII. With enhanced protocols it's usually much faster. Later model vehicles that use CAN will show between 6 - 16Hz with generic OBDII. Obviously, enhanced coverage will usually be faster as the proprietary protocols used by vehicle manufacturers allow for multiplexing and broadcast modes not supported by generic OBDII."

Likewise, when I looked up "Bavarian Technic" I came across a thread here: http://www.e90post.com/forums/showpo...4&postcount=30 where it says that even for the later BMW E90 the sampling rate is only 10Hz with that software.

With the DashDyno or the PC version (Auterra Dyno Scan) set up using CAN protocol via OBDII my Z4MC will only sample at 7Hz (140 milliseconds intervals). As I've said before the limitation of OBDII datalogging appears to be the sampling rate which is determined by the manufacturer, and Autoenginuity confirms this, and in the case of BMW cars, the Auterra software obtains one of the lowest sampling rates when compared to the results from the cars of other manufacturers. What sampling rates do you get from the Bavarian Technic and Autoenginuity software specifically for the Z4MC? Any examples to share?

[exdos]

Originally Posted by beta

For datalogging, I've been meaning to try bmwlogger 2, now that I have the cable from bm technic.

That's one of the few datalogging applications I've seen for Mac. I'll give that a try if it will connect with the hardware that I have.

[O-cha]

Originally Posted by exdos

I've taken a look at the Autoenginuity website and this is what it says in the FAQs:
"What update rates can I expect?

The biggest variable in this answer is the vehicle. Older cars will do between 4 - 6Hz with generic OBDII. With enhanced protocols it's usually much faster. Later model vehicles that use CAN will show between 6 - 16Hz with generic OBDII. Obviously, enhanced coverage will usually be faster as the proprietary protocols used by vehicle manufacturers allow for multiplexing and broadcast modes not supported by generic OBDII."

Likewise, when I looked up "Bavarian Technic" I came across a thread here: http://www.e90post.com/forums/showpo...4&postcount=30 where it says that even for the later BMW E90 the sampling rate is only 10Hz with that software.

With the DashDyno or the PC version (Auterra Dyno Scan) set up using CAN protocol via OBDII my Z4MC will only sample at 7Hz (140 milliseconds intervals). As I've said before the limitation of OBDII datalogging appears to be the sampling rate which is determined by the manufacturer, and Autoenginuity confirms this, and in the case of BMW cars, the Auterra software obtains one of the lowest sampling rates when compared to the results from the cars of other manufacturers. What sampling rates do you get from the Bavarian Technic and Autoenginuity software specifically for the Z4MC? Any examples to share?

Read what you quoted then read what I wrote, then what you quoted then what I wrote. Then realize I don't really like you and have no intention of helping you. I've already given you the answers you need.

[exdos]

Originally Posted by O-cha

Read what you quoted then read what I wrote, then what you quoted then what I wrote. Then realize I don't really like you and have no intention of helping you. I've already given you the answers you need.

You've been unable to prove anything you've said from the outset despite you acknowledging that what I said in my first post is true, so you've just turned it into something personal against me throughout. That's no problem to me.

[O-cha]

Originally Posted by exdos

You've been unable to prove anything you've said from the outset despite you acknowledging that what I said in my first post is true, so you've just turned it into something personal against me throughout. That's no problem to me.

If that's how you want to see it.

[G80indy]

Originally Posted by elwesso

I usually shift at around 7500 anyway, I don't think there's a lot of advantage shifting above there, and apparently the high RPM's is what kills the rod bearings.

The S54 is roaring up there at 7500 anyways.
Plus it's topping out on the power curve. After that ~ 7700 level, it becomes the "denouement" ...
Pushing to 7900-8000 revs for eking out all vestiges of hp? ...the power incline is done at that point.
I did the Italian tuneup Sat with my wife in the car, and at that level near redline it's nuts (in a good way/ the sound is ripping as is the urgency) but where to shift, 7500, 7700, 8000 -- it's splitting hairs.
Of course I'm on the street not a track.