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Old 09-29-2014, 02:01 PM
minspd minspd is offline
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Default Welded diff vs LSD

Has anyone run both a welded diff and an LSD, ideally on the same car?

Is an LSD faster?

Posted this question on trackhq but realized people here might be more helpful: http://www.trackhq.com/forums/f350/l...ad-racer-7796/
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Old 09-29-2014, 02:19 PM
jfryjfry jfryjfry is offline
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A buddy did and his 350z on the track was useless compared to the vlsd he changed to
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Old 09-29-2014, 04:20 PM
RalliartRsX RalliartRsX is online now
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A welded diff will be under "lock" on all conditions (be it throttle on or throttle off, etc), so the car will always want to plow straight and understeer like a pig.

Good for "dorifto" but a terrible road coarse setup in anything but a good kart (literally).
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Old 09-29-2014, 04:22 PM
e1_griego e1_griego is online now
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Considering how many OS Giken diffs are on here, it's pretty easy to see how people have voted with their dollars.
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Old 09-29-2014, 04:52 PM
minspd minspd is offline
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Quote:
Originally Posted by jfryjfry View Post
A buddy did and his 350z on the track was useless compared to the vlsd he changed to
Was this on street tires or R compounds?
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Old 09-29-2014, 04:56 PM
minspd minspd is offline
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Quote:
Originally Posted by e1_griego View Post
Considering how many OS Giken diffs are on here, it's pretty easy to see how people have voted with their dollars.
I should have clarified that I am interested in data for front wheel drive cars, which is why I posted in the Sentra forum. For rear wheel drive cars OS Giken does appear to be the way to go.

My 240 has a welded diff and the car is borderline unusable on street tires. Unquestionably unusable in rain on street tires. It becomes somewhat acceptable on R compounds but still slow. This is a drift car though with unknown alignment, for all I know it was set up to slide.

My Civic is very balanced with a welded diff and one thing I learned from it is alignment makes a big difference in the behavior of a car (http://winhpde.com/blog/2013/fwd-welded-diff/#alignment).
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Old 09-29-2014, 04:57 PM
e1_griego e1_griego is online now
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Oh lol, I use the 'new posts' button and rarely check which forum things are posted in.

My mistake.
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Old 09-30-2014, 04:59 AM
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FWD cars do good with a welded diff if you drive hard into a corner, an LSD will be faster if you like a nice, smooth driving style on corner entry and mid-corner.

RWD cars with welded diffs are horrible on track unless you do A LOT of setup work to make it kinda sorta work. You can never really stomp on the throttle mid-corner to transfer weight, so it makes the "always wanting to come around" rear end even more of a pain to drive around.
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Old 09-30-2014, 07:23 PM
minspd minspd is offline
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Thanks Def. I don't think I object to aggressive corner entries :-)

Will limited slip help with tire wear?



(Top is the outside of the tire.)

This was with 3 degrees of front camber and I don't think this much camber is excessive. Front tires were rolling over with 2 degrees of camber.
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Old 10-01-2014, 07:57 AM
Matt93SE Matt93SE is offline
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Yes, a limited slip will definitely help with that part.
Also, flipping your tires before they're that worn out will give you considerably more life. looks like the outer tread depth is at 40% or so?
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