Those who have rev limit increase... quick question?

[stefan]

Originally Posted by ChrisDUS

a) the M3 revs so eagerly that it feels strange to already shift up before the stock red line

b) the higher resulting rev in the next gear when you shift up will likely give you better acceleration due to more power being available.

Interesting.. though those seem like relatively trivial advantages considering the exponential increase in stress as rpm's increase.

[ChrisDUS]

Originally Posted by stefan

Interesting.. though those seem like relatively trivial advantages considering the exponential increase in stress as rpm's increase.

No doubt, just like increasing boost on FI does.

[BPMSport]

Tach can not change higher up there. It's not variable at the top. Even the dynamic redline can not go below 4500RPM wihout creating a whitespace at 8K

I have set my redline at 3000 rpm until the car is completely warm, thinking about adding red so it stays uniformly red from 3K to 8300 where the static red is.

Here is a video I took earlier today at the lowest stock level before the white begins to show:

Edit: going to take a quick video for you guys..

[Rich_Jenkins]

Very informative thread.

[KJ]

When the tach indicates 8,250, is the car really revving at 8,250? Or is it really at 8,400?

- KJ

[Jive]

Originally Posted by KJ

When the tach indicates 8,250, is the car really revving at 8,250? Or is it really at 8,400?

- KJ

8400, as mentioned on the previous page.

[BPMSport]

Just FYI, you guys can check the RPM on the cluster in digital format. I'll try to post the steps later today if I have some free time.

[Rekrul]

Originally Posted by Mike Benvo

Just FYI, you guys can check the RPM on the cluster in digital format. I'll try to post the steps later today if I have some free time.

Steps!!!

[CanAutM3]

Quoted from another thread, how to access hidden menu, actual revs is under menu item 7.2:

Originally Posted by savage.ulm1

The reset button for the partial km will be named from now : 'T'.
START:
1: insert the ig.key into the slot pushing in the meantime the T button. You enter into the secret menu. It will appear a code like for example ZB12345.
2: You have to add all the numbers you see. Example:12345 = 1+2+3+4+5 = 15.
Remember this sum.
3: Push 'T' several times untill you will see the menu n.19. Wait for about 2 seconds.
4: it will appear the sentence : "lock on" and after other 2 sec. "code 00".
5ush the "T" button how many times like the sum you got before (in this case : 15).Ok now you have entered into the secret menu.
Now the menu will go automatically to menu number 01.
6: push the "T" button for example 7 times and wait for some seconds untill you will enter into the sub-menu 7.1- 7,2 etc . In this area you will see the water temperature...For the complete list read the precedent post.

Note: when the car is not with the engine running, make a test with the menu n. 2....Very spectacular....

Reference to old thread:

http://www.m3post.com/forums/showthr...=111105&page=2

[BPMSport]

Originally Posted by CanAutM3

Quoted from another thread, how to access hidden menu, actual revs is under menu item 7.2:



Reference to old thread:

http://www.m3post.com/forums/showthr...=111105&page=2

+1 Thanks..

The only good ones to use are menu 2 (cluster test)

and 7.1 I believe is coolant temp in C, 7.2 RPM, and 7.3 kph

(this is off the top of my head, it's the same as my E46 was back in 2003), except instead of just going to function 19 to unlock, they made it a calculation of the vin #.

[BPMSport]

Originally Posted by m3alabama

wow never knew this and actually just thought about this the other day when I wondered why you cannot actually rev to 8400 indicated on the tach but did not know why! I kept trying to go over the redline to hit "8400" but it hits a soft cutoff and knew this could not be right.

How cheap is the M that they can't make a different guage for the tach than the m5/6!

I can see why now people may register an "overrev" as you can take it beyond red probably to 8500 before you hit the cutoff

Yes, there are higher limits in the code above the redline actually set. One is on the injection side of the processor and another on the ignition side of the processor - max rpm for injection / max rpm for ignition.

There is also a byte that refers to rpm buffer. All of this combined lets you hit 8,450 ish with a stock car (especially with DCT).

[TheDeliverator]

Originally Posted by Mike Benvo

...I have set my redline at 3000 rpm until the car is completely warm, thinking about adding red so it stays uniformly red from 3K to 8300 where the static red is...

What engine temperature do you have your settings at to release the 3K rpm limit?

[BPMSport]

Originally Posted by TheDeliverator

What engine temperature do you have your settings at to release the 3K rpm limit?

I've changed it to 4,500 until I open the cluster and extend the red to be able to go down below 4,500.

Top screenshot is stock, bottom is with my current changes.

The way to properly read it is between
-25C and 0C the RPM will raise from 5000 RPM to 5000RPM
0 and 25C the RPM will raise from 6000 RPM to 6500.

(Now keep in mind that 25 Celsius is 77 Fahrenheit, so this is the section that most people will be in depending on their climate - this is why people in California have a 6500 RPM limit upon cold start).

Then once coolant temp reaches 50 Celsius (122F) the RPM is raised to 7000, and finally to 8,300 at 80 Celsius. Keep in mind the ECU uses an interpolation function and will seek out the midpoint between two points to use as the actual value.

With my changes, it stays at 4500 RPM and raises slowly. So at 60 Celsius 5500 RPM becomes available, and at 80 Celsius the full redline is available.

I would say that normal operating temperature is between 90 and 100 Celsius.

I have another video of this in action if you want to see it.

[TheDeliverator]

Originally Posted by Mike Benvo

I've changed it to 4,500 until I open the cluster and extend the red to be able to go down below 4,500.

Top screenshot is stock, bottom is with my current changes.

The way to properly read it is between
-25C and 0C the RPM will raise from 5000 RPM to 5000RPM
0 and 25C the RPM will raise from 6000 RPM to 6500.

(Now keep in mind that 25 Celsius is 77 Fahrenheit, so this is the section that most people will be in depending on their climate - this is why people in California have a 6500 RPM limit upon cold start).

Then once coolant temp reaches 50 Celsius (122F) the RPM is raised to 7000, and finally to 8,300 at 80 Celsius. Keep in mind the ECU uses an interpolation function and will seek out the midpoint between two points to use as the actual value.

With my changes, it stays at 4500 RPM and raises slowly. So at 60 Celsius 5500 RPM becomes available, and at 80 Celsius the full redline is available.

I would say that normal operating temperature is between 90 and 100 Celsius.

I have another video of this in action if you want to see it.

Badass.

Appreciate the detailed explanation.

Is this offered as one of your coding options?

[BPMSport]

Originally Posted by TheDeliverator

Badass.

Appreciate the detailed explanation.

Is this offered as one of your coding options?

Tuning option, yes.

No problem

[Dave07997S]

How come Mike was banned?!?!?! WTF!!

[leJUNd]

Originally Posted by Dave07997S

How come Mike was banned?!?!?! WTF!!

+1 He brought so much knowledge to the forum... we need more members like Mike. Devastating loss to the forum.

[CanAutM3]

Originally Posted by Dave07997S

How come Mike was banned?!?!?! WTF!!

WTF , just saw that too. It must be very recent. Huge loss to the forum, he brought great knowledge, shared information openly and demistified a lot of things. I hope this is a fluke and will get promptly resolved.

[1MOREMOD]

Originally Posted by Dave07997S

How come Mike was banned?!?!?! WTF!!

Seriously?