legacycentral bbs

Anyone know anything about this? It doesn't make sense as it says you need front and center LSDs for this to work, yet isn't the item a center diff? I don't know what the front diff would have to do with it either other than giving them more money if you purchased from them.

http://www.cuscoracing.com/tarmac%20gear.html

Steve

Wouldn't you need a different ratio?

Like the WRX, doesn't it have a different final drive in the rear than in the front because of the stepped center diff?

They just say LSD, because where are you going to find the proper ratio, open front end? They offer the part, so just buy theirs at the same time.

Maybe I'm off base.

I don't see why you'd need a different ratio. Torque split and gear ratios are two different things. The wrx has a different ratio front and rear yet the torque split is still 50:50 right?

How does that happen? I'm interested in learning now.. edjamacate me!

the wrx has different ratios front and rear? that doesnt sound right
wouldnt the wheels move at different speeds?

..which means if they're not spinning at the same speeds that it's either got cross-diffs, or something similar to 4-motion..?
Wouldn't that make their 'Symmetrical AWD' a tad bit uh, Asymetric?

the wrx front diff is a 3.9, the rear is 3.54... there is a step up gear at the tail of the tranny that equates to 1:1.1 ratio

3.9/1.1=3.54

This doesn't mention anything about ratio changes. What does an LSD have to do with the final drive ratio anyway? I assume it's like DCCD, but with a fixed rate. Can a viscous coupling be anything but 50/50 under standard conditions? I may be interested in this down the line, but I don't want to add a front LSD to the bill.

Steve

The thing you guys are missing is the fact you no longer have the viscous coupling. So you have an open diff in the center, and no longer truly have AWD.

It even mentions this
¥Watch out!: This product is not Limited Slip Differential Gears.

¥Watch out!: This product requires the Front and Center Limited Slip Differential Gears

So basically this is a locked diff with 65/35 split? Damn.

Steve

Just because the center doesn't have some form of LSD doesnt make it not AWD

this reminds me of the ninos auto thingie that made a wrx a rwd car so people could drift.

evolutionmovement wrote:So basically this is a locked diff with 65/35 split? Damn.

Steve

No, it's an open diff. You really won't have any true form of AWD afterwards.

Yes torque split will be 35/65 if traction is the same at all four corners....but if one doesn't have traction, all the power will go to it, like an open diff.

Why wont it be AWD?

I guess it's awd, but as soon as you're in any low slip condition, all the power is going to be sent to the wheels that are slipping.

Like a volvo

Unlike 4motion, then?

91legacy_sleeper wrote:Unlike 4motion, then?

4motion is a completely different awd technology.....but yes...unlike 4motion.

I understand it's not our awd system, but the way you guys were talking, this system doesn't re-direct power in the case of a slip.. which.. doesn't seem right to me anyhow. I've heard 4-motion does the opposite of that --takes power away from the slipping wheel.

well i asked about this over on special stage in the car construction forum.

and this is the first answer i got:

Andy Swingler on Specialstage wrote:because without the F & R LSD you'll get sick wheel spin on either of the inside wheels (depending on weight xfer) - especially when/if you lift one. And what happens when it comes back down. Bye Bye half shaft.

makes sense to me. as this would be a pretty common occurance in a tarmac racing situation.

here is the link to the thread there.
http://www.specialstage.com/dc/dcboard. ... 8870&page=

azn2nr wrote:this reminds me of the ninos auto thingie that made a wrx a rwd car so people could drift.

this is much more complex than that.

it will make a AWD car awesome in the reaaly twisty stuff that could normally have it behave a bit like a heavy understeering pig.

That would be hope. When all is said and finally done, I want to be able to slide sideways up streets like a muscle car. I'd almost go RWD, but it's more work than AWD and doesn't really make sense in New England.

Steve