Am I correct in assuming the GS has no limited slip diff? So does that mean if I peel out, only one wheel is spinning? Just wondering because when I turn corners, it feels like both wheels are spinning, but I am almost positive there is no lsd.

 

You are correct, the GS does not come standard with an LSD. There are a couple of options (you can find out a LOT more if you use the search feature and just look for "limited slip" or LSD in this forum) including a TRD clutch type LSD (I have this one) and putting in a torsen type LSD from a Supra (which also can include steeper gears). There are a couple of other aftermarket options that members have looked into, think one is carbon fiber.

 

I have the ATS Carbon LSD installed on my car. It closely resembles the clutch type TRD and like the TRD retains stock gearing. It also runs about $500 more than the TRD. I don't know anyone that has driven both enough to compare so I can't give you an opinion on which is better or worse. If I 'm not mistaken, the TRD is a 2 way while the ATS configuration I selected is a 1.5 way. A google search will point you to several good information resources. You can find info on the ATS LSD at:

http://www.a-t-s-usa.com/ats-products/lsd-carbon.shtml

 

While we are on the topic of LSD's is there any advantage to be gained by using the TT LSD on a 300?

 

In my uninformed opinion (IMUO) The TT LSD would actually hurt the GS300 performance as I've read the GS300 has a higher ration (3.91?) than the GS4 (3.23). The TT LSD has a 3.76 ratio if I recall correctly.

Unless you have a turbo and/or bad tires that allow you to spin your wheels at will, it'd be a waste of money. There are some advantages to grip with both wheels in the snow and wet, but there is also more difficulty in controlling the car with the LSD it if you DO lose traction (until you get used to it).

 

I too have the ATS carbon LSD. I will install in the next few weeks. Just been too busy with other installs. It's available in both 1.5 way or 2 way configuration. Much smoother than the TRD.

 

Hey Dan, if you haven't installed it, how do you know j/k. I've had no issues with my TRD LSD being less than smooth after I switched to Redline differential oil with the proper LSD lubricants built in. The LSD additive they use at the dealer for the RX just doesn't cut it IMO (which is what they put in mine at initial install). The ATS website hints at a similar issue with the advise on using their own specific lubricant.

 

We've installed in other applications, just not on my car. The TRD is a standard metal clutch type, just like the standard ATS and Kaaz units. In fact I'm sure they are made by either Kaaz or ATS for TRD Technocraft. Kaaz makes the NIsmo ones I believe.

 

redgs4,

Can you enlighten me as why you chose 1.5 way over 2 way? TIA

 

I debated back and forth and decided that the 1.5 way was better for me given my level of driving skills, that my car is a daily driver and most my driving is street rather than strip.

Direct quote from www.club4ag.com:

Some manufacturers make LSD's in different configurations and are commonly classified as 1 way, 2way, and 1.5 way. This designation reflects the design of the cam groove which enables the LSD to function differently under different loads. A 1 way differential means that the cam is shaped in such way as to have positive lock only when accelerating. The 2 way is constructed in a way to have positive lock motion in either acceleration or deceleration. The 1.5 way is a new term used to describe the 2 way cam which enables different lock up rates during the two directional forces. The 1.5 distribute positive lock stronger under acceleration than when decelerating. The 1.5 way can provide more forgiving balance when braking than a full 2 way setup, although it is less effective for true racing applications, it provides easier operation in throttle off conditions. It is also effective for front drive cars which need extra stability during braking.

From a website advertising the ATS LSD [probably taken from the ATS web site]:

ATS LSD is available in 1.5-way and 2-way style based on the locking action of the differential cam gear. The 2-way results in differential lock sooner under accelerations and maintains differential locking longer after the accelerator is released. Due to this action, 2-way is recommended for drag racing as it contributes to rear end stability during launch and straight line braking. 1.5-way is recommended for street and road course driving as it allows tighter approach due to improved traction resulting in a faster line.

 

Thank you redgs4. It seems 1.5 way is my kind of LSD. Is there any price difference between 1.5 way and 2 way?

 

Price between the options was never a consideration so I was not specifically looking. With the ATS and some other brands you have a choice of 1.5 vs 2 way, but if you are considering the supra or TRD you get what you get [2 way, I think].

 

There's some great info in you post redgs4, thanks for sharing with us.

 

Good info!!