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Old 03-31-2005, 07:10 AM   #1
manman99
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Default Cusco rear lsd or DCCD with Suretrac lsd Front and Rear

Hi All,

Like to find out with below configuration, which one will enter and exit corner faster ,

Configuration 1
a. Cusco rear lsd 1.5 way only, no lsd in front

Configuration 2
a. Dccd with front and rear STI suretrac lsd

Configuration 3
a. Dccd with front Helical lsd and rear STI mechnical lsd.

Thks
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Old 03-31-2005, 08:12 AM   #2
Uncle Scotty
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....ANY front lsd diff will be faster....and don't froget the center diff....
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Old 03-31-2005, 09:37 AM   #3
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I have configuration #3 in my JDM STi RA gearbox setup and I love it man

Last edited by MK19_; 03-31-2005 at 10:24 AM.
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Old 03-31-2005, 09:57 AM   #4
John Vanos
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What will the car be used for?
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Old 03-31-2005, 12:20 PM   #5
moremaga
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If you only get one lsd, get a front. It will help you get on the gas sooner out of corners
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Old 03-31-2005, 12:33 PM   #6
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I have the 12kg center diff, helical front, STi mechanical rear. Heading to Summit Point this weekend for the first track test of this setup (RA gears, 4.44 final).

-Keith-
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Old 03-31-2005, 02:42 PM   #7
dwx
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The open front diff will be the best for corner entry. The best mid corner and exit setup is #3. Not a big fan of the suretrac diffs after having one in my 6MT. I'm replacing it with a Cusco 1-way front LSD.
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Old 03-31-2005, 02:44 PM   #8
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Quote:
Originally Posted by dwx
The open front diff will be the best for corner entry. The best mid corner and exit setup is #3. Not a big fan of the suretrac diffs after having one in my 6MT. I'm replacing it with a Cusco 1-way front LSD.
My front is the STi helical 1.5 way and the rear is the mechanical 1.5 way. I am very happy with this setup, albeit it is a lil noisy... Phil, any noise issues with yours? Not that it is incredibly loud, but being new to LSD's and all...
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Old 03-31-2005, 02:49 PM   #9
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Not in the car yet. I have a Kaaz 1.5way rear and it's noisy.
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Old 04-01-2005, 01:49 AM   #10
manman99
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Default

Thks for the reply...

If a wrx with only viscous coupling centre differential with no lsd front and rear at the moment And change to below configuration
- Cusco tarmac 35% / 65% centre differential
- and Cusco RS 1.5 way differential


A. How will this setup behave? Corner entry and exit?
B. will the Cusco RS 1.5 way nosiy? Is the noise is unbearable?
use the car for daily drive and occasional track day.
C. will this setup corner entry and exit faster or slower than below setup
setup 1 - Dccd with front Helical lsd and rear STI mechnical lsd
(Latest STI MY05).
setup 2 - Dccd with front and rear STI suretrac lsd
setup 3 - retain my wrx VC centre differential and put cusco front
and rear lsd.
D. must I put a front lsd for above confgiuration?
(Cusco tarmac 35% / 65% centre differential and Cusco RS 1.5 way
differential)

Thks
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Old 04-01-2005, 04:52 AM   #11
nhluhr
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Quote:
Originally Posted by manman99
If a wrx with only viscous coupling centre differential with no lsd front and rear at the moment And change to below configuration
- Cusco tarmac 35% / 65% centre differential
- and Cusco RS 1.5 way differential


A. How will this setup behave? Corner entry and exit?
B. will the Cusco RS 1.5 way nosiy? Is the noise is unbearable?
use the car for daily drive and occasional track day.
C. will this setup corner entry and exit faster or slower than below setup
setup 1 - Dccd with front Helical lsd and rear STI mechnical lsd
(Latest STI MY05).
setup 2 - Dccd with front and rear STI suretrac lsd
setup 3 - retain my wrx VC centre differential and put cusco front
and rear lsd.
D. must I put a front lsd for above confgiuration?
(Cusco tarmac 35% / 65% centre differential and Cusco RS 1.5 way
differential)

Thks
I asked Adam at Z1Performance if the Cusco Tarmac centre diff could be used in a WRX and he said only with a front LSD... in fact he sells a package of the Cusco Tarmac + Front LSD for 2199.

I guess the reason for this is that maybe the center diff is a type which cannot operate if one end is unloaded (and if you have an open front diff, as soon as one wheel is high-centered, that whole axle is "unloaded" and thus the center diff has no loading bias to operate the plates).
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Old 04-01-2005, 11:30 AM   #12
manman99
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Default

Quote:
Originally Posted by MustangKilla
My front is the STi helical 1.5 way and the rear is the mechanical 1.5 way. I am very happy with this setup, albeit it is a lil noisy... Phil, any noise issues with yours? Not that it is incredibly loud, but being new to LSD's and all...
Hi Mustangkilla,
is the front STI helical or the Rear mechanical LSD that cause the noise?
is it like thud thud sound when you do cornering?
is it bearable?

Thks
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Old 04-01-2005, 11:33 AM   #13
manman99
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Quote:
Originally Posted by dwx
The open front diff will be the best for corner entry. The best mid corner and exit setup is #3. Not a big fan of the suretrac diffs after having one in my 6MT. I'm replacing it with a Cusco 1-way front LSD.

Hi dwx,

any reason why replace the suretrac lsd to the cusco 1 way?
what set up are you running in front and rear?
does the cusco 1 way has any sound like thud thud sound when doing
corners?

Thk
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Old 04-01-2005, 11:39 AM   #14
MK19_
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Both LSD's make some noise. I get clunking and clacking at lower speeds when cornering- but it is bearable

d
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Old 04-01-2005, 12:05 PM   #15
dwx
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Quote:
Originally Posted by manman99
Hi dwx,

any reason why replace the suretrac lsd to the cusco 1 way?
what set up are you running in front and rear?
does the cusco 1 way has any sound like thud thud sound when doing
corners?

Thk
I was either overpowering the suretrac last year or it wasn't reacting fast enough for my tastes. I'm hoping the Cusco LSD will work better in those regards. With the 6MT there aren't a whole lot of choices. I feel the Helical LSD in the 05 STI works better than the Suretrac, but it wasn't around back when I made the purchase. The Cusco uses clutch plates but shouldn't be as harsh as the Kaaz. It may still clunk at low speeds but probably nothing like the Kaaz, which is very noisy. I have a Kaaz 1.5 way rear LSD.
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Old 04-01-2005, 12:13 PM   #16
dwx
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Quote:
Originally Posted by nhluhr
I asked Adam at Z1Performance if the Cusco Tarmac centre diff could be used in a WRX and he said only with a front LSD... in fact he sells a package of the Cusco Tarmac + Front LSD for 2199.

I guess the reason for this is that maybe the center diff is a type which cannot operate if one end is unloaded (and if you have an open front diff, as soon as one wheel is high-centered, that whole axle is "unloaded" and thus the center diff has no loading bias to operate the plates).
The tarmac gear is just an open differential, it's not a LSD at all. So if you are lifting a front wheel off the ground for some reason the car just won't go anywhere.
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Old 04-01-2005, 02:06 PM   #17
moremaga
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Quote:
Originally Posted by MustangKilla
Both LSD's make some noise. I get clunking and clacking at lower speeds when cornering- but it is bearable

d
I have a front Quaife lsd, no noise. That might be another option for you (manman99).
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Old 04-01-2005, 06:18 PM   #18
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the Quaife is quieter because its a helical..the Cuscos is a cluch type.

For the front, either style works very well - and as posted if you buy ANY aftermarket LSD, the front should be #1 on the list, as nothing provides as dramatic of a change in all aspects of the car.

For the rear, I cannot stand the helical styles at all for the simple fact that they rely on both wheels being on the ground.....since a WRX lifts the inside wheel under very tight/quick cornering, this can be a no no, and lead to understeer city. The Clutch types (both front and rear), while noisier, are also adjustable for lockup percentage, and some are adjustable for LSD action as well (1 to 1.5 way, or 1.5 to 2 way)

Adam
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Old 04-07-2005, 11:43 PM   #19
manman99
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Hi All,

Thks for all your valuable inputs.
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Old 04-08-2005, 12:49 AM   #20
FuJi K
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I personally would want this set up:
Cusco Tarmac center diff
Cusco 1 way front LSD
Cusco 1.5 way rear LSD

Reasons:
Front LSD: Traction on power out of corners and no LSD effect during deceleration for better steering response.

Rear LSD: Oversteer on power out of corners and some LSD effect for stability during deceleration into corners or mid-corner. This helps reduce the over-understeer transition when you're mid-corner and going WOT.

Center Tarmac Diff: Rear biased power is great!

------------------------------------------------------------------------

I personally haven't has a LSD in my car, but I have put in a welded diff in the rear. The car totally changes in character. When I give it gas in a corner, the rear wants to come around. I HAVE done doughnuts with it in DRY pavement spinning like a top, not big circles. I've even done a doughnut without pulling the e-brake, I just simply floored it and the rear came around. I can do it easier if I pulled the e-brake to get the rear sliding first. But this is more of a spool rather than a LSD.

FuJi
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