I have a 2005 base model Z, and I am running at 10psi. Obviously I have an open differential, which doesn't help with traction too much. When I get in to boost, I lose traction pretty quickly, which makes it kind of scary to tune the car at higher boost levels.

Anyways, I have an automatic limited slip differential in my shop that I can install. I am curious to know if the stock Nissan limited slip differential is much better than the open differential, or if I should upgrade it to an aftermarket differential. If I upgrade to the aftermarket diff, should I use the casing and R&P from the auto differential, or the 6 speed open diff?

Thanks

Chris

PS- I am also using stock tires and wheels, so I am not sure how much that plays in to things... Is the stock rubber known for having little traction?

 

stock LSD is better than no LSD, but aftermarket is best

That's gotta be scary doing 10 psi on stock tires/wheels and no LSD. Do you hit the fuel cut off a lot when the tires break loose?

 

never had a problem with the stock LSD, both tires always spin at the same time

 

What aftermarket LSD's are there other than Nismo. I heard Nismo isn't good for daily driving (makes some loud noises). Traction is one of my big concers as well when i think about going FI. What do you guys do about it? Honestly, what good is it to get an APS TT (example) and not get any traction. DOesn't it makes sense to go Vortech, make less power and still have traction? Or do all FI kits create traction issues?

 

there's a lot of LSD's out there, just takes a search button click. I have nismo. It's ok. Much much better than stock LSD and I'm NA. I used to fishtail a lot when I was stock. I put on 50 more whp and the nismo LSD and my car no longer fishtailed - on stock tires, 50 more whp. It works. It pops a few times when turning during the first 5 min or so of driving when the car has been sitting cold for a bit. Other than that I honestly can't tell it's on. It's just a sound though. Cornering feels MUCH more solid and confidence inspiring. Easier to control throttle oversteer. And it won't overheat on road courses when tracking or go bad/overheat like the stock LSD when it gets some hardcore driving done on it. I like the ATS one the most, but it won't work with my 3.9 final drive. Otherwise the Cusco RS is what I would have picked. I'm not up todate on the others that are recently available though





some of us feel the same way, others would rather just have the big tq numbers anyway and drive on the street in drag radials. If you lose traction, you can kick the car sideways and possibly crash, more tq is bad on the engine (yeah parasitic pullies on the SC are bad too - but what if you have a KJR pulley and lightweight clutch to offset that a little?), when you do lose traction the car can possibly over-rev hitting the fuel cut off for a bit and that's bad news with FI. But yeah, all about pros and cons. Who doesn't find twin turbos appealing at least in concept?

 

Same thing here, I lose traction when I got WOT and I have potenza SO3.

Is there something better then those for grip ?

 

what's the width of your tires?
What point in the rpm's do you lose traction?


There might be some sorta traction control thing to come out someday for the Z that would limit boost only to the point where you have traction. That'd be nice, but something seems contradictory to me about taking away power from a TT kit - which was the whole point of getting a TT in the first place. Not only that, but that takes any sorta skill out of the equation for launches which some people with TT say over and over again how elite or whatever they are because they can launch with a TT and other people spin tires not going anywhere.

So in effect, it'll enable a drag newbie to launch just as well, so all that elite launching skill will become obsolete to some degree and the million hp monster Z will be putting down 350-400whp at launch anyway. The extra huge power doesn't come into play until you reach 90mph (if you have over 500whp) at which point you'll pull way ahead of SC Z's with a faster trap speed too because you can open up all that power to it's full potential, but still only equates to about the last 20% of the 1/4 mile where it becomes a real advantage

I'm sure saying that is going to anger the ST and TT gods, oh well sorry. I'm trying to be objective here

 

275-35-19's

and at about 3- 4k they break loose

 

yeah 275 isn't wide enough. Hell I have 295's and I have less than 300whp NA currently and wouldn't go any skinnier with street tire tread. I think the tq on the ST and TT kits usually peak at 3-4k and so that makes sense to that be where you have issues.

Just curious, when you're cruising at say 5k rpms and go WOT, does it break loose too? Usually ST and TT have less tq at 5k than 3-4k


Otherwise, wider tires help, the 3.3 final drive might help some, LSD will help a little maybe - at least might prevent fishtailing. Otherwise drag radials/slicks will of course always help. Or take off weight in the front, and add some to the rear of the car somehow. That's really about it other than some sorta traction boost controller that might come out someday in the future. Oh you can get the rear tires aligned with some camber rods so that the tires are more vertical with closer to or at 0 degrees camber or toe. Maybe less tire pressure in the rear

 

Do you have any rubbing with the 295's ?

I was thinking of going 285 but if the 295 fit, I'll go 295.

 

What offset wheels are we talking about.

Respect
JET

 

rubbing only depends on your offset of your wheels - what's your offset and size of rims? You running 9.5's in the rear I take it?

I don't rub on the street at least. I might rub my inside shocks slightly only because my offset is +43 and my zeal coilovers are really thick. I've thought about getting some 5mm spacers and/or different brand tires that are still 295's but smaller section width, but so far no rubbing on my setup - lots if not most people with 295's don't rub if they have higher than a +20mm offset. Usually people shoot for around 30ish mm offset on 10.5 inch wheels. Some people claim you can fit 335's in the rear. I've only seen 315 though. I think it actually depends on how thin your shocks are

 

They're 19'x10.5 but can't remember the exact offset

 

what wheels are they? I can look em up

 

Maido GR5

Thanks !

 

I think those are +29mm offset which if that's true you can run 295 with no prob - check that it is first though, don't trust me. It should even maybe say on the wheel

Really you should be able to just tell by looking with a flashlight crawling under the car some to see how much the tire clears the fender and shock by. You obviously want some room for when the car turns. The less body roll the less the risk of rubbing too

 

I'll check it out.

Thanks again !

 

put a rear-end from and automatic tranny 350Z, that should help alot, and with a aftermarket LSD...WoW

 

I have the 5AT rear in mine and still traction issues, I am not sure about an aftermarket LSD but I thought the 5AT pumpking was too small.

 

I have nismo 18's with 295's bf goodrich drag radials and Im having traction problems in third!! I always make sure that Im running a full tank of gas to add some weight to the rear tires... with a full tank of gas and a passenger i can hammer the throttle in second at 40mph with out traction problems... 500-550rwhp is really all you need anything past that is all for top end...