Sport Button thoughts.

[shimmy]

Nothing to do with high revs and low revs?

ok, so its the amount of pedal travel i am on about (didnt soemone post a table of pedal travel to throttle opening sport on and off recently)

what im getting at is that if the car is harder to control at initial pedal movement with sport on surely it is easier to control at the bottom as it has more travel for less throttle response

[The Gorilla]

Hi,

The E.gas [Fly by wire] is controlled by
the thottle inputs to the engine load.

The E.gas Stepper Motor, is a linear motor,
it opens and closes the throttle bodies as there is no
throttle cable, which is via the input signals from the
Throttle pedal potentiometer.

ie ] Right foot input.

When the Sport Button is engaged, the
ECU alters the amount of fueling,
so that more fuel is allowed into the injectors.

Thus at equal throttle openings, but with ''Sport mode''
''on'', the engine gets more fuel.

Unless this fuel is burnt it will make for a
''Jerky'' ride as the ECU detects unburnt fuel and
cuts the fuelling to the injectors.

And so the ''Jerky'' cycle continues.

As Lawsy said, smoother pedal input loads will help,
as for a smaller pedal movement the engine
receives the same amount of fuel,
or its foot to the floor, and away you go.

The more you try and 'modulate the pedal'
in Sport mode the worse it gets.

Its part of the reason, although most of the
ECU brigade diagree, that I prefer an S54
with a Throttle cable.

Reason being is that on Track coming out of
slower corners its much easier to feather the
throttle modulation to keep the engine well
in the Rev band without getting into issues
wherby throttle inputs get your right foot
ahead of the E.gas Stepper motor.


Regards,

The Gorilla.

[toplad]

End of

Topic closed :smt023

[DuncanR]

CSL sport only alters throttle. Thats it.

Not true Lawsy ... it fooked my steering up once !!!! :hahaha::banghead:

[mattCSLnut]

The Primate has spoken :smokin: If anyone is still unsure, best you get your coat :hahaha: The End

Hi,

The E.gas [Fly by wire] is controlled by
the thottle inputs to the engine load.

The E.gas Stepper Motor, is a linear motor,
it opens and closes the throttle bodies as there is no
throttle cable, which is via the input signals from the
Throttle pedal potentiometer.

ie ] Right foot input.

When the Sport Button is engaged, the
ECU alters the amount of fueling,
so that more fuel is allowed into the injectors.

Thus at equal throttle openings, but with ''Sport mode''
''on'', the engine gets more fuel.

Unless this fuel is burnt it will make for a
''Jerky'' ride as the ECU detects unburnt fuel and
cuts the fuelling to the injectors.

And so the ''Jerky'' cycle continues.

As Lawsy said, smoother pedal input loads will help,
as for a smaller pedal movement the engine
receives the same amount of fuel,
or its foot to the floor, and away you go.

The more you try and 'modulate the pedal'
in Sport mode the worse it gets.

Its part of the reason, although most of the
ECU brigade diagree, that I prefer an S54
with a Throttle cable.

Reason being is that on Track coming out of
slower corners its much easier to feather the
throttle modulation to keep the engine well
in the Rev band without getting into issues
wherby throttle inputs get your right foot
ahead of the E.gas Stepper motor.


Regards,

The Gorilla.

[3wheels3]

...(didnt soemone post a table of pedal travel to throttle opening sport on and off recently)...

I have seen a graphical representation of it somewhere & know what you're getting at :thumbs:

[3wheels3]

shim

[ando]

And here's me thinking it was something to do with the Flux Capacitor????

[The Gorilla]

Hi,

Who complied that Graph please ?

Reason is that its incorrect.

A TB will give its max performance at
something like 92/93% of opening.

The reason is simple the ''butterfly''
obstructs the flow path so it can
never give 100 % throttle opening
it can only give 100 % on the Throttle
angle.

Therefore, accordingingly the Graph
would be showing 100% throttle angle
which in real terms would be approx
93% open Butterfly at 80% of Pedal travel.

The M3 Throttle Pedal has a detent set
at something like 95% of travel
for this very reason.

Some alter the Throttle pedal detent thinking
that the final 5% pedal, will give more power,
when the Throttle bodies are already
maxed out at 95% of butterfly opening.

Regards,

The Gorilla.

[3wheels3]

Hi,

Who complied that Graph please ?

Reason is that its incorrect.
...
Regards,

The Gorilla.

Hi

Searched google, something like 'e46 m3 throttle position sport mode', images only. Gives 3 or 4 different graphs different sources.

eg http://forums.m3cutters.co.uk/showthread.php?t=5850

[azrael]

This thread would be more interesting if it was sports illustrated

[glendog74]

This thread would be more interesting if it was sports illustrated

Shimmy has a lot to answer for... :bigcry:

[3wheels3]

This thread would be more interesting if it was sports illustrated

There's an app for that :thumbs:

[shimmy]

Hi,

Who complied that Graph please ?

Reason is that its incorrect.

A TB will give its max performance at
something like 92/93% of opening.

The reason is simple the ''butterfly''
obstructs the flow path so it can
never give 100 % throttle opening
it can only give 100 % on the Throttle
angle.

Therefore, accordingingly the Graph
would be showing 100% throttle angle
which in real terms would be approx
93% open Butterfly at 80% of Pedal travel.

The M3 Throttle Pedal has a detent set
at something like 95% of travel
for this very reason.

Some alter the Throttle pedal detent thinking
that the final 5% pedal, will give more power,
when the Throttle bodies are already
maxed out at 95% of butterfly opening.

Regards,

The Gorilla.

i thought you said it was fuel related and nothing to do with pedal/throttle opening changes!

[The Gorilla]

Hi,

Shimmy- you have me confused.

All I said was that the Graph was incorrect
in regard of the data provided.

I then gave some paramiters to explain
why I said the Graph was incorrect.

Last I explained the Throttle
Pedal 95% v TB's at full throttle.

I still maintain that the Fueling is increased
on the ''CSL'' Alpha N type set up
with the Sport Button on.

Reason being due to the Adaptive
fueling of the CSL ECU, that the std
M3 does not have.

On a standard S54 with MAF then its
throttle pedal angle v throttle angle,
over the Mid range only, which is all that can
alter, as the TB's are closed at the
start and open as wide as they can
at full throttle.

The start and end points are fixed.

ie] Pedal off would be zero, and
pedal fully depressed [95% to detent] would be
100 % of Throttle angle with
Butterfles giving approx 93/4% flow.

Go drive a Std M3 with sport on
and then go drive a CSL with
sport on.

Reagrds,

The Gorilla.