Sport/Race mode, any one noticed this?

mikef4uk · 08-23-2011, 04:50 AM

Owned the bike 18 months, 6000 mile, bike has Akra full system, PCV/A/T:

In sport mode the bike is a complete animal. drives lovely out of corners and the smoother Sport mode suits my 'smoother' riding style:

Now, in sport mode my bike will lift in both 2nd and 3rd gear, in 3rd gear thats around 120

it will do this every time.

However, If I get a little bored and try 'race' mode although the bike feels sharper on the throttle it doesn't always lift in 2nd and virtually never in Race, any thoughts?

R35 GTR · 08-23-2011, 07:37 AM

I feel its more riding position. I had the bike on the dyno, and dyno'd in slick. Then unplugged the slick mode and dyno'd in race with the same results. I know its not the same in your situation, but the same thing came up comparing race to slick saying race was more of an "animal".

HyperM3 · 08-23-2011, 12:12 PM

I ride mostly between sport and race modes. My butt has told me that sport feels smoother in the midrange but loses something up top. Whereas race feels a little more lackluster in the midrange but pulls like a freight train up top. Race definitely feels a bit twitchier than sport out of corners but that could just be the quicker throttle response. Probably doesnt help that I have one of the alpha throttles on the bike either.

Swanny · 08-23-2011, 12:21 PM

When I took mine to the drag strip, in RACE/DTC "on" I'd get wheelies in 2,3, and even a bit of lift in 4. When I went to SLICK/DTC "off"....the front stayed down and the bike behaved much better.
Going by the book, it should be the opposite....so I chalked it up to me being better positioned and more ready for the "animal"...

LiterBoy · 08-23-2011, 01:13 PM

Quote:

Originally Posted by Swanny

When I took mine to the drag strip, in RACE/DTC "on" I'd get wheelies in 2,3, and even a bit of lift in 4. When I went to SLICK/DTC "off"....the front stayed down and the bike behaved much better.
Going by the book, it should be the opposite....so I chalked it up to me being better positioned and more ready for the "animal"...

Odd behavior indeed, Swanny. I wonder if "behaved much better" has something to do with you not having to fight against the computer's decisions. With DTC off, the ultimate control is in your right hand, not shared between you and the ECU. If you could "tune" the ECU for drag racing, maybe DTC would be less of a problem?

I generally ride in Sport and switch to Race about 25% of the time. Both modes will lift the front in second gear but I haven't taken notice of any "qualitative" difference between the two modes when the wheel comes up...too busy trying not to cr@p my drawers, most likely.

Is there any way to know what the fuel delivery curve looks like in each mode? I guess you could look at dyno charts, but is there such a thing as a graph that might trace throttle position against fuel delivery? Is fuel delivery even the issue?

skapan · 08-23-2011, 03:19 PM

I'd have to agree with most posters on this. Sport and race feel pretty well the same as far as lofting the front wheel, the big change for me is that the throttle is far more sensitive in race. Of course the nannies chop the wheelies quicker in sport but I think you know that.

Swanny · 08-23-2011, 03:47 PM

You may be right LiterBoy....I remember reading the initial write-ups on the bike back in early 2010 about the "interference" between rider command and ecu allowance. Removing dtc under "high-demand circumstances" allowed for a MORE composed ride....and I had my best times in the 1/4 w/ all electronics turned off.

As far as I know the maps are the same in sport, race and slick...the difference between them is ever increasing throttle response and ever decreasing electronic interference.

mikef4uk · 08-23-2011, 04:42 PM

Quote:

Originally Posted by Swanny

You may be right LiterBoy....I remember reading the initial write-ups on the bike back in early 2010 about the "interference" between rider command and ecu allowance. Removing dtc under "high-demand circumstances" allowed for a MORE composed ride....and I had my best times in the 1/4 w/ all electronics turned off.

As far as I know the maps are the same in sport, race and slick...the difference between them is ever increasing throttle response and ever decreasing electronic interference.

I also believe they are the same as well, I read the BMW techs S1000RR 'book' it basically explained as you go through the modes the throttle gets sharper and the ABS/TC parameters get wider.

Odd though mine definately wheelies more in 3rd in Sport mode than in race mode where it stays flat