ive heard many different veiws on the effectiveness on 2-way LSDs on RWD. Main issues people debate are understeer at corner entry. But others say, if properly driven, can be faster than a 1.5 or 1-way.
So whats the scoop? If anyone has any theory, or even better, racing experience with a 2-way, please help me out.
for those that dont already know, the car im setting up is a 240sx for ITS....
thanks! -Chris

 

PM vapor the s2000 mod he can't stop talking about his

 

Would you define a 2 way, 1.5 way, etc. LSD? I don't think I have heard the term stated as such before. Thanks.

 

1.5 vs 2

http://www.kaazusa.com/inc/content_faq.asp

 

The convention I have seen is 1 way only locks up under power, not deceleration. 1.5 way locks about half as much under decel as accel. 2 way locks about the same under accel and decel. For an IT car, no ABS, it seems to me that it would help rather than hurt. It should make it harder to lock up the inside rear tire under trail braking. I suppose if it's set for too much lockup it could cause understeer, but only if it's set almost as tight as a welded diff. Understeer powering off the apex would be my concern.

 

yea, i know how they work, im just looking for some 1st hand info.
i just hear lot of bench racers saying 2-way is drift only so id like to hear some credible people

 

I think both of us were replying to Lee as far as answering his question on what they are.

As far as use on a racecar, the oem ones on performance type cars are currently closer to the 1.5 way than 2. The ones I've seen anything on are doing this to make them more stable under braking and on turn-in. From what I can see, the 2 way can cause oversteer on corner entry rather than understeer. It may also be related to keeping the abs happy by not locking the rear wheels together.

I think you would get better info from either the IT forum or the scca forum. There are lots more people with rear drive experience who can give an educated opinion.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mohudsolo &raquo;</TD></TR><TR><TD CLASS="quote">I think both of us were replying to Lee as far as answering his question on what they are.

As far as use on a racecar, the oem ones on performance type cars are currently closer to the 1.5 way than 2. The ones I've seen anything on are doing this to make them more stable under braking and on turn-in. From what I can see, the 2 way can cause oversteer on corner entry rather than understeer. It may also be related to keeping the abs happy by not locking the rear wheels together.

I think you would get better info from either the IT forum or the scca forum. There are lots more people with rear drive experience who can give an educated opinion.</TD></TR></TABLE>

well what you say sounds more realistic to me.
But have posted this question in the IT forum and no resposes yet for like 3 days!
its too slow of a forum.

 

Try SCCAforums too.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TeamSlowdotOrg &raquo;</TD></TR><TR><TD CLASS="quote">Try SCCAforums too. </TD></TR></TABLE>
sorry but that forum is even worse than IT

any other input is welcome guys!

 

does anybody here have first hand experience with 2way lsd on FWD? we just tested 2 way mugen and... handling is odd... of course we also made several other changes. sorting through it. will share later. just want to see what others have to say (1st hand only please).

for junintegra: 2 way lsd is made for drifting. there's no reason why you would want the rears to lock under de-accel in RWD car under road race conditions. at least i can't think of any (except maybe it helps braking in straight line?!?!).

 

i dont see the purpose of a 2 way or 1.5 way for an FF car. IMO, it hurts FF cars when entering corner as you break if its locking up while you deacel... But of course i only speak in concept for i dont own an FF car (i drive 240s).

For FR, personally i would go with a 1.5 way, even for drift. My reasoning for that is: when going into corner, i would use accleration to get the rear out slightly if needed, however if it ends up comming out too much, i can just deaccel and it would start to gain traction again and not spin out by pushing it too hard.

 

Aren't most OEM units designed as 1.5 way diffs?

 

OEM clutch differentials are few and far between. Helical/Torsen/anything gear based work on an entirely different principle, and you don't label them as 1 way, 1.5 way, 2 way, etc. The only differentiating factor is the torque bias (and well, whether or not it blows up or not after hard use ).

 

You're right, and I'm an idiot for forgetting that.

 

Do you play much Gran Turismo? That's the only place I've ever seen such terms, as well as the drivetrain configurations of the various cars in your signature. (FF, FR, MR etc.)