Throttle Map Question

[chono]

Anyone know what the OEM throttle mapping settings actually look like?
What would a graph of pedal position to throttle position look like?

You can settle an argument..
I think that 'Normal' is linear (y=mx) and 'Power' is logarithmic (y=logn(x)).
So normal would open the throttle bodies 1:1 with how far down the pedal is - from 0 to 100%.
And power would open the throttle bodies more than 80% with 1/2 pedal input and then slowly go to 100% beyond that 1/2 pedal.

Friend thinks that 'Normal' is exponential (y=mx^n) and 'Power' is linear (y=mx).
So he thinks that normal opens the throttle bodies less than say 25% with about 1/2 pedal input and then quickly goes to 100%.

Who is right?

-'chono'

[Helmsman]

You are closer to the truth Chono. The power button clearly increase sensitivity which is the whole idea. With how much and how far into the pedal position Im not sure but you can easily prove this by playing with the button standing still and give a tad throttle. Say you have 2k rpm and then with power applied you get another 1k or so without moving your foot.

The closer you come to full throttle the smaller the difference power vs normal is, at what point they meet I dont know but Im sure a tuner could chime in and tell.

[thekurgan]

PM Mike Benvo, he had a sweet 3d graph here somewhere.

[Sered]

Originally Posted by chono

Friend thinks that 'Normal' is exponential (y=mx^n) and 'Power' is linear (y=mx).
So he thinks that normal opens the throttle bodies less than say 25% with about 1/2 pedal input and then quickly goes to 100%.

Who is right?

-'chono'

It's definitely the reverse of this. Normal is linear, y=x (and a lot of track-users prefer it to 'power' mode due to this) and 'power' mode is logarithmic. y = log x

[chono]

Thanks for the replies.
I PM'd Mike Benvo. Hopefully he has time to respond (and maybe with that plot!)

My friend and I both want to be using the linear mode (for autocross).. just have different opinion as to how to get that mode.



-'chono'

[thekurgan]

Originally Posted by chono

Thanks for the replies.
I PM'd Mike Benvo. Hopefully he has time to respond (and maybe with that plot!)

My friend and I both want to be using the linear mode (for autocross).. just have different opinion as to how to get that mode.



-'chono'

Here, I dug it up in case he's busy:

http://www.m3post.com/forums/showpos...0&postcount=41

[Petros]

why is it 3 dimensional? what does the y axis represent?

[Sered]

Originally Posted by Petros

why is it 3 dimensional? what does the y axis represent?

RPM and pedal position are the two axes

[BPMSport]

The linked pic is not actual throttle response, it's referencing expected airflow which has an effect on response. I'll post normal, sport, and sport plus pedal mapping if I have time later today.

Normal is definitely more linear.

[Rexpelagi]

After trying both I can't autocross as well with the 'Normal' setting (or drive around town as well). The throttle feels totally dead initially, which leads me to add way too much throttle. I actually find it quite difficult to modulate and end up making a mess of it.

Basically, I give it 25% throttle in 'Normal', it does nothing. I give it 50% throttle, and I end up with slight acceleration. I give it 75% and I end up with way way too much. I'm used to applying throttle based on what the car is doing, and the dead feel of the 'Normal' mode messes with me in terms of knowing how much to add.

On 'Power' mode, it is sensitive but I can give small modulations and at the top of the peddle travel they actually do something. It reduces my tendency to feel like I need another inch of travel to actually do something, and ends up making the throttle application more linear for me.

Just my thoughts - not sure what the actual curves like but normal just feels way to dead to me.

[chono]

I found this:
http://s16.photobucket.com/user/M3Du...leMap.jpg.html

So I made this:


Not sure how accurate it is.. So I may be spreading some misinformation here..

I hope Mike (or another tuner) posts a real plot.

[Helmsman]

Well there you have it Chono, should settle the bet with your mate..☺

Rex, tend to agree once you've got used to the sensitivity of Sport it feels good. Still when trying on track the linearity of Normal was really good and made it much easier to modulate the throttle.

[chono]

Originally Posted by Helmsman

Well there you have it Chono, should settle the bet with your mate..☺

Sort of ..
not sure if that data is accurate.
Would like a tuner to produce the same thing. (Or just say that M3Dust is a tuner and that the data was accurate.)

Needless to say - yeah - this confirms my assumptions .. sort of.

It does confirm what Rexpelagi (John) says.. 'Normal' is a little "dead" initially then its pretty linear to 100%.

Also - Rexpelagi (John) is the one who I'm betting against. Haha.

-'chono'

[Rexpelagi]

Originally Posted by chono

Sort of ..
not sure if that data is accurate.
Would like a tuner to produce the same thing. (Or just say that M3Dust is a tuner and that the data was accurate.)

Needless to say - yeah - this confirms my assumptions .. sort of.

It does confirm what Rexpelagi (John) says.. 'Normal' is a little "dead" initially then its pretty linear to 100%.

Also - Rexpelagi (John) is the one who I'm betting against. Haha.

-'chono'

This car was expensive enough, I don't need to lose more money! I don't remember a bet...

[BPMSport]

Here you guys go.. note the axis of normal VS sport VS sport plus - this is why the difference is so drastic even though the graphs look somewhat similar.

[chono]

Thanks for the knowledge Mike!
And man do those plots hurt my head. The 3-dim I can handle.. but the shifting non-linear X-axis hurts my brain.

[thekurgan]

Linear FTW