Ok, so Im digging around a bit... RRM's site says their Limited Slip utilizes modified existing technology to make a fit on our RA's (not an exact quote mind you)

So I am curious, I've installed alot of Limited Slips, Mechanical Lockers and air lockers over the years... RRMs picture appears to have some machine work done on an existing LSD unit... Mostly it appears as though the case has been machined to fit the ring gear over the case, and then the Carrier Bearing surfaces look remachined as well...



So heres what i need... Who knows our stock Axle Shaft Spline Counts? And, who has installed one? If someone has one sitting out, or has the stock drive unit laying around, Im willing to bet I can match it to another unit and modify it to work cheaper than $1299


I have access to a lathe, which appears to be all I will need... Im almost betting it s from a DSM or other import, just machined to match our ring gear and bearings...

 

if thats the case make one up for me and ill buy it off you.

 

Well, knowing what I do about manufacturing, Im pretty sure RRM didn't try to re-invent the LSD for our application...

I just need to find out what our stock carrier's specs are:

Ring Gear Bolt Pattern, Ring Gear ID, Overall Width, and Carrier Bearing ID...


I think im onto something, just gotta get those specs...

Anyone got a dead tranny around? Used carrier after LSD install?

 

And, Im still not convinced that we can't use something like this...

http://speedfreakracing.net/catalog/...roducts_id=456

Though its not for our car, Im willing to bet that only minor maching would be needed to make on of these operate in our open differentials...

To make this work, I would only need to know the Diameter of the Differential Center Pin, and the space between the spider gears inside the carrier...



Damn, I really need to get a RA Carrier...

 

I believe the lsd rrm sells is one for an eclipse, and the price is so high because it's a quaife. not sure if that's entirely accurate, I never spoke with Rob about it or anything, but another person (I don't remember who, although I do remember they were somewhat reputable) on here said that one of the eclipse lsds is cross compatible.

 

this is like a "phantom grip" ls i beleive there out of florida .will these take as much force as say the quaife lsd ? the phantom grip ls just expands an locks in some how i can't see them being as good or stong as the quaife but they are alot cheaper to make .
oh heres an artical i read this week in my local newspaper
http://www.lfpress.com/cgi-bin/publi...icles&s=wheels

 

BBQ Allen have found a Quaife application that fit on our car... do a little search (Allen BBQ sauce RIP supercharger)

and yes it was cheaper !

 

BBQ allen.... HAHAHA i forgot about that cowboy. And your right. RIP supercharger. Rest In Pieces.

 

Well, theres 2 parts to how the phantom grip works...


Bear with me here....


First, heavy springs inside the plates will put pressure against the spider gears for a little extra traction...


But the biggest part most people don't understand happens here... The center pin inside the differential does alot of the work believe it or not... Under a load (acceleration) the pin will put pressure against those blocks, pushing them against the spider gears as well... The harder the acceleration, the better the traction...

They work very similar to Drop-in style lockers for 4WD trucks... I do alot of these installs...


Now, there is no mechanical connection between this style LSD and the axleshafts, so a Quaiffe is going to be able to handle alot more power... Then again our cars aren't huge HP monsters yet...


As for wear and tear, soo many people are worried about metal to metal contact inside the differential... Ring and pinions are metal to metal, and do just fine... Its all in the quality of the gear lube...

Im just looking for something I can either develop, or make work for less $$ than the quaiffe... Plus I can install it myself, so its cheap enough for me to do...


Oh yeah, Im getting Boosted very soon, so this will be my next mod after the RRM turbo kit..

 

from reading how this thing works on the 2 sites and the OP it seems to me if you accelrate hard during a corner it will lock both wheel at the same speed thereby causing loss of traction and sending you in a straight line? i may be worng i am not well versed in traction and racing ideology but it looks liek you get better traction straight line but would need to ease off a bit more in turns?? ( i say this because i thought all cars had a differential to slow the speed of the inside tire in turns or is that what an lsd is supposed to do ... help!)

nevertheless it still soUnds liek a good idea keep us posted n what comes up and good luck

 

lithiumX, with an open diff on an FWD car, you get on the gas torwards the end of the turn, but the weight is still mostly on the outside wheel, so you dont have the traction you need on that inside tire so it spins. you dont come out of the turn with as much authority as you'd like and have to stay off the throttle a bit to keep the tire from spinning so you can complete the turn. So you see, the inside tire should be going slower than the outside tire because it has a shorter distance to travel, but an open diff has means that you can spin taht inside tire much more easily mean the inside tire is going faster than the outside tire. with and LSD, that last bit of the turn where you would get back on the gas, unless you have alot of power, you wont be spinning the tires because the LSD will lock the fronts together (more or less). that way, the outside tire(remeber with all the weight on it) is now pulling the car around the last bit and the inside tire isnt spinning because its not getting all the power sent to it on its own. you never just power through a turn anyways with front wheel drive, with or without an LSD. basically you can get on the gas harder and sooner(still after the apex though) and get away with it. so even if the tires were doing the same speed, thats gonna be much better than the inside tire going faster. this is just a basic idea. its all in my head, but its hard to explain like this.

oh, also remember, if we are talking about a real FWD racecar here, they are probably gonna be toed out in the front pretty good, meaning the in and outside wheels doing the same speed means even less so you can get on the gas even sooner.

also, someone correct me if im wrong about any of this. like i said, it makes sense in my mind, dont know how its gonna look on the screen. haha

Greg

 

Yes and No... Limited Slip = just that.... It will slip some in the corners...

A Locker will fully lock, or fully disengage the wheels...

A Spool (or welded differential) will never unlock...


I have driven many 4WD's fully locked or spooled in the front, and yes, they do tend to plow forward.... I have also driven a fully spooled Rabbit GTI on the a track, and the traction was awesome, but you had to oversteer... Not something you want to mess with on the street... Thats why a limited slip makes more sense for a street car... In any front driveline, you will have to oversteer depending on the level of traction... A fully locked driveline will make the wheels spin the same speed all the time... In a corner, we know the inside and outside tire will spin different speeds with an open differential...

 

Found that...