Hoovey689

iTrader: (16)

All modern premium GT cars have selectable drive modes. Some have more than you might realize.

The 2015 Lexus RC F is a V8 powered track beast that can also coddle you on a commute. Part of the way that the car is able to achieve these multiple personalities is with what are termed “selectable drive modes.” At the Lexus RC F media event I learned a delicious little secret about some off-the hook drive selections not shown on the RC F options in the car. I want you to keep this just between us. OK?

Lexus RC F Drive Mode Selection
The drive modes in the Lexus RC F are accessed by a simple rotating selector switch. The default setting is “normal.” This setting has full AC, normal throttle response and the transmission will find a place for the engine to be that is relatively responsive, yet will avoid the gas guzzler tax. To the left is the “ECO” setting. Turn the **** one click left and the car will reduce the AC usage, put a little push back under the gas pedal, and do some other things with the transmission to make your ride less pleasurable. You will save a thimble of gas.

The Two Lexus RC F Differentials Torsen vs. TVD
There are actually two RC Fs in case you were not aware of that. One has a Torsen limited slip differential (LSD), and the other a Torque Vectoring Differential (TVD). I will first explain the basic drive selection modes with the standard, Torsen LSD.

Lexus RC F Sport Mode
The fun starts when you turn the **** to the right. In “S” mode, the throttle is no longer linear. Push a little, get a little power. Push a little more, get MUCH MORE POWER. Make sense? The transmission will also hold its gear a bit longer, and it will downshift the car when you slow, so there is more power when you get back on the gas. Finally, the power steering changes a bit and the steering is a little more direct. This mode would work well on some back-roads driving at mostly legal speeds.

Lexus RC F Sport+ Mode
Turn the **** to “Sport+” and the RC F comes alive. All that prior stuff is still in effect, but the transmission now assumes you want aggressive down shifts (BLAM!, BLAM!) that rev-match and take place in under 0.2 seconds. It also assumes that you want to hold gears well into the 4,000 or higher RPM ranges so that you use the maximum power of the engine. Suddenly, you are in a race car. Lexus says that at this setting the Vehicle Dynamics Integrated Management (VDIM) systems comes into play. This is the system that regulates the car’s traction control (TRAC) and stability control (VSC). The VDIM holds the key to changing the personality of the RC F from Hugh Jackman to full Wolverine.

Are you still with me? Amazing, but good. If you have the TVD differential, there is another set of settings to play with. You toggle the differential settings through “Normal,” “Slalom,” and “Track.” The TVD actually powers the outside rear wheel in a turn to help you rotate the car in corners. The settings apply the appropriate amount of added torque for your course. It works. I couldn’t make much use of it, but the car did seem to rotate differently when I drove both back to back.

OK, Here Is the Secret Stuff
What Lexus has not labeled anyplace, and may not even include in the manual is the mode called “Expert.” This is a setting that the instructors warned us NOT TO USE. We being journalists, not professional drivers with constant on-track experience. In this mode, the traction control is OFF. Not reduced, OFF. A lamp illuminates saying so. Another lamp comes on and warns that the car is now in “Expert” mode. VSC is reduced to allow all liberal sideways action. The car can now become a drift monster if the driver has the skills and tire money. The ABS is also adjusted so that if the car is jumped (not kidding here) the ABS won’t freak out and retard the spark and thus cause a loss of power when the car lands and needs to accelerate. Conversely, the ABS won’t start pulsing and reduce the braking effectiveness of the car when it lands if it needs to then brake quickly.

To access this mode you…I’m not telling. I asked a Lexus contact off the record, and he (or maybe she) told me a bit about how to access them. I was given a hint at how it is done, but my lips are sealed. My contact told me that owners of the RC F will have the setting, and how to access it, explained to them at purchase.

The Final RC F Setting
Shortly after my contact mentioned (sort of hinted actually) that there may (might, could possibly) be one more setting that Lexus can access to let the RC F completely off the leash. He/She hinted (alluded to, maybe whispered) that it won’t make the car faster, even for professionals but that some professional Lexus R&D drivers actually want to disable all the safeguards and fly without a net. That setting and its access is not going to be explained to owners.

http://www.torquenews.com/1083/secre...-keeping-quite

ISF001

The ISF also has a setting that is not "published" in the manual. By using what ISF owners refer to as the "pedal dance," the car can be unbridled for "spirited" driving.

The "expert" setting is definitely there. It will also appear in the instrumentation when selected--I've seen it.

I'll post an image if possible.

chris07is

iTrader: (10)

Yeah, i dont think its a secret. I saw the video some where here that used the expert mode....one if the car journalust that went to take the rcf for a spin at ny event.

jat0223

iTrader: (1)

The pedal dance is one of the worst things you can do for spirited driving.

spwolf

not sure if IS-F had ABS effectively disabled? This seems more than usual TRC disable of previous gen Lexus vehicles.

chris6878

why is that?

ISF001

He will need to answer this question.

When the road is open, I throw it onto manual and leverage the torque converter lock up clutch in gears 2-8 and have the time of my life.

Ninja10r

Pedal dance , was a way to turn off the trac and vsc if you have a IS-F or just press and hold down the trac off button for 3 seconds

jat0223

iTrader: (1)

The pedal dance not only disables the nannies but the E-LSD as well which is bad for track/spirited driving performance. Holding the button disables the nannies but leaves the E-LSD working. Even if you have a '10 + MY, the E-LSD works in conjunction with the LSD.

Joe Z

iTrader: (10)

In this thread....

New Video - Performance is in your control [check out EXPERT MODE]


~ Joe Z

ISF001

Thanks Joe. I knew that I saw it in one of the videos.

ssmoked

I can't figure out this 'secret' setting besides the expert mode. Or is that the secret setting

If I hold the traction off button after the 'expert mode' is already on, it just turns it off. Am I missing something?

Myrcf doesn't have TVD, does it require it for the 'secret mode'?

IMCHIA

From what I've read, if you long hold the traction control the Expert mode will come on (with a tap of traction control off) but if you continue to hold, the Expert mode goes away but the other traction off light continue to stay on.

In this mode apparently, everything is turned off so equivalent to ISF pedal dance.

Not sure if it's correct but I read it somewhere and it does work.

ssmoked

But what does it do above the expert mode?
what does the isf pedal dance achieve?

2GSKaizen

iTrader: (1)

If this in fact a "secret" mode I can confirm that this also works on the GS-F we have on our show floor.