t0e

iTrader: (1)

Foool! I know the shop and where to buy one

Christan

Ill wait for the Torsen one hehe. TOMs Malaysia told me that they MAY know some guys in Japan who can reflash the ECU to get it to work. We just need to wait for it to become available.

Lots of IFs, MAYS and BUTS.. but there is hope

flipside909

No Joe. But i'm glad you have.

Joe Z

iTrader: (10)

Come on now...

Christan

Wanna hear some good news? TOMs Malaysia Spoke to TOMs Japan and they said that installing LSD on the IS F poses no problem at all. this is the Toms 1 way Mech LSD. The rationale is this, the Electronic LSD system on the IS F, kicks in much later than what it leads on to be.

Now we have to wait for the original Torsen version as TOMs did say that their LSD is "a little rough". I think this looks good for us folks Once the parts become available, ill be in line to do it. I just cant wait. Like i said before in first post. This will even things up a bit with m3 handling.

oh and a little more precision on steering too but no one can deny that IS Fs can drift.

teoh2005

Exactly what I have been saying all along.

-Kevin

Christan

You are absolutely right Kevin
I went back to read what you said. Now i guess we can just wait for the part!

foup

Pardon my ignorance, though I understand the purpose of a differential and why it needs to be locked (otherwise I suppose if a wheel is in the air the other one would stop getting torque), in what regards is the electronic system in the F -which supposedly acts like a LSD- a problem for everyday, even fast, driving? First, I suppose it's probably very rare when I get a wheel up even during "my" hard cornering but should it happen, if the VDIM acts too late (compared to a true LSD) then I suppose I am going to lose a little bit of speed, but no more. Am I correct? If so, that's fine, perhaps that would save me a wreck down the road...

Now, should I go to a track (I still have to but if I really wanted to I would have a got a two-seater), in sport mode, is the VDIM supposed to act more aggressively, emulating better a true LSD?

The fact that Lexus is putting a LSD in the 2010 model makes me wonder if the VDIM does indeed perform as good as anticipated. I am puzzled why Lexus would do that for track driving, or very few of its F customers. This car really has a major problem, experienced by a large percentage of the customers, which is its suspension, and Lexus could have solved that in the 10 model instead of putting a real LSD. Further, a better suspension may reduce the need of a real LSD (after all the wheels are supposed to stay on the tarmac under all circumstances, aren't they)?

Thanks for your feedback.

chrisburke

its not all about the wheel in the air. the LSD steers the car in hard turns. being able to plant the power to BOTH wheels and point the car in the direction you want in a hard turn makes things alot easier. FYI...

Christan

Yes, the suspension is one issue, because we do not have have a suspension which is adjustable like the m3 so the inclusion of a mechanical LSD would definitely make this better. I think Lexus did not want to make the IS F too different from the IS 250s/350s. Just my 2 cents.

But mech LSD works a lot better than electronic LSD, also because of feel and making the steering a little more precise. But you are right if anything is going to make the most difference its the suspension. An adjustable one.

t0e

iTrader: (1)

I think the IS-F should come with a "Dynamic" suspension that is adjustable, just like the e92, e90... "F-Dynamic's" .....

Celsius

iTrader: (1)

the LSD retrofit is the same as any other diff swap and to take advantage of it once it's fitted, you would want to drive with VDIM off.

foup

That seems to make sense indeed.

However I am puzzled that VDIM which, as opposed to a LSD, also knows about the steering input, speed, etc, would not be capable to emulate pretty well what a LSD can do.

I suppose track times at the Nurburgrin with a 2009 and a 2010 ISF will tell the story and it better be much better with the 2010 otherwise I would not understand why Lexus chose that option for the 2010 model. For my parts, I suppose it would not get me home any faster during my daily commute...

FisforFast

I wouldn't expect it to be that significant. VDIM emulates a mechanical LSD very well for real-life situations. Keep in mind that no amount of electronic or mechanical nannies will keep you from crashing the car if you're an idiot. The VDIM's LSD emulator is fine for responsible driving, and even spirited driving. An LSD is definitely an advantage around a track but I honestly do not see how significant of a difference it can make around a twisty mountain road if one is driving with even an ounce of responsibility.

ISF-88

I wonder if able to retrofit the LSD how would it affect warranty? Would there still be warranty if not installed by Lexus? Also anything dealing with ECU reflash or upgrade usually voids warranty.