mr2 lsd for 5sfe transmission?, got a whiff of this on the forums. details??? Options

[3sgteLuke]

so... i was bored and i was browsing teh forums and stumbled upon a mention of an 05 mr2 spyder lsd http://www.6gc.net/forums/index.php?showtopic=55683.

1.what do they mean by "not too agressive"

2.what are the set backs if a diff is too agressive?

3.could someone explain the advantages of helical/torsen? http://wikicars.org/en/Limited_slip_differential this gave me a general idea. is the mr2 a 1 , 1.5 , or 2 type lsd?

"The S series and C series transmissions share differentials:

The S51 (Camry, Solara), S53 (90-93 Celica), S54 (MR2, 93+ Celica), C56 (MR2 Spyder, Celica GT), and C59 (Corolla, Matrix, excl. XRS) all use the same differential. The MR2 Spyder's helical LSD WILL work in any of these transmissions. The differential part number is shared between these transmissions. Same part number = same part. The MR2 Spyder, however, was the only car to receive a factory LSD that is compatible with these transmissions. It should be exactly the same as the TRD Helical LSD that was discontinued for the S54."

4.does this mean that the transmission thats paired with my 5sfe is a s53? or a c56? by celica gt do they mean the 7th gen?

5. I would love someone who uses one of these to detail the handling difference with one of these installed. in detail

6. supposedly these are easy to install, true false?

7. can you tell this is reviving my interest in the celica?

8. Before this lsd revelation, what other options did one have when looking for lsd upgrades? excluding phantom

9. how would a 5s tranny paired up with an mr2 spyder lsd compare to a v6 tranny in terms of longevity, performance, and fit for application?

sorry for the explosion of questions but pleeez answer all of these, because this would seriously change my car for me.

This post has been edited by 3sgteLuke: May 14, 2008 - 9:43 PM

[BonzaiCelica]

so from my understanding Helical LSD is the best for Front Wheel Drive vehicles. Correct. Being that it did come on SS-III Celica's, Integra Type R DC2, and new Civics.

Helical LSD:

Manual versions of the Nissan 2005X are fitted with a helical limited-slip rear differential, as fitted to the V Spec Skyline GT-R coupe. Under acceleration, the helical LSD provides faster traction control than a conventional clutch-type LSD or viscous LSD and without relying on the performance of the Viscous Coupling oil as used in a Viscous LSD. Basically, the Helical LSD generates torque to both left and right rear wheels by frictional force between the gear teeth and the differential case. If one wheel loses traction and tries to spin, that axle's side gear rotates slightly faster, so transmitting the lost torque through the helical gears and back to the differential case. The engine torque is also applied to the same part of the case through the final gear so it in turn drives the road wheel through its side gear. Honda equipped the Integra Type-R with a helical LSD, which is a superior type of LSD that does not incur power loss compared to the normal viscous coupling LSD. The helical LSD tranny of the Nissan SE-R Spec-V allows the front wheels to rotate at different rates while still applying torque equally, reducing understeer in the corners and allowing you to grab gears on the twisties and apply the throttle in turns sooner with more control.

Torsen LSD (Torsion sensing LSD):

Torsen, which stands for torsion-sensing, LSD's use gears and typically provide more like 75% coupling. The MRT Torsen style front LSD locks under load so provides more grip when exiting a corner, but acts like an open diff under trailing throttle so it does not induce understeer coming into the corner. This is the major difference with a mechanical LSD. Most rally and full race cars use clutch pack diffs as a Torsen LSD is unable to transfer torque if there is none, ie if the wheel is off the ground it will not work, a clutch diff will. A Modena Torsen LSD is a non-adjustable unit that in theory transfers torque from a spinning wheel to the other wheel before it spins.

Point to consider - a torsen LSD, has silent operation and is ideal for street use.

Im confused as to why that information I sourced put torsen and helical as two different types of lsd, they are combined right??

I know a lot has to do with what kind of suspension you are running and the grip of your tires. I figured that Helical/Torsen LSD is used for cars with 180whp and 150wheel ft lb torque and below. Can anyone further explain the pros and cons for the 1.5 lsd. I understand that under deceleration the 1.5 will lock up and create understeer when coming into a turn, which is not good for ff drivetrain and the 1.5 clutch type "locks" when it detects slippage, effectively forcing both wheels to travel at the same speed through a turn. This prevents the inside wheel from spinning uselessly and allows power to actually be utilized fully. But this in turn will create more understeer. So why the helk did trd make a 1.5 way lsd for our s54 tranny's if its mainly used to Rear wheel drive cars such as the is300, mr2/mrs, ae86, and supra???