For those who missed this before, a caveat using an LSD with mad power (like an s/c with NOS). A local shop put a Quaife in a VW they'd already s/c'd for the guy. He was showing off to his friends how he could leave double stripes on the pavement and he snapped his crankshaft in half. That's 1-1/2" of pure hardened steel, and one expensive repair! There's always a weak link to break. Heck, I snapped a driveshaft on my normally aspirated Maxima with the old open differential! Needless to say, it trashed the differential too.

 

 

for a newbie like me in this stuff, what is a Quaife ??? What does it do?

Dixit

 

Search is your friend.

 

Read my very long and descriptive contribution under the Max FAQ thread in the 4 gen forum.

About high power and high traction, yup, once you start strengthening certain things, other things will become the weak link. I'd say my transmission is pretty strong right now, as I cryogenically tempered the gears on the inside, and I have a Quaife. I sure hope my crankshaft doesnt break.

 

I think he must have had a flaw already in the crank for it to break like that. My Son has a VR6 with a Quaife and Slicks, he dumps the clutch at 4k at every launch and he ran low 13's all last year with no problems. This year he has installed direct port etc and should be in mid 12's so we hope it holds together.

 

Maxima engines are built relatively strong, and i think the crank could hold up to 350 hp without serious problems. I think CV joints and output shafts would twist up like a straw before the crank snaps. Some motors do have flawed parts though, blocks, cranks, rods, any imperfections and something under that kind of stress has got to give eventually.

 

I guess I'll find out later this year. I'm getting axles rebuilt/cryo treated, will have a prototype LSD, and hopefully the tranny will be fully rebuilt. I guess I'll find out what's weak then. But the Maxima looks like it has pretty good sized axles, so I don't think they'd go that easily.

 

Yeah, but there has to be a weakest link somewhere. If you're using slicks...and its not the transmission or the axels...the next thing to go would be the crankshaft!!

 

Wouldnt it be the clutch? Hmmmmm a reason to like my Cenerforce DF, it slips! HAHAHAHAHAHA

I'm heading to the track this Wednesday. I'll be trying out some drag radials for the first time along with the juicy bost, soooooo wish me luck!

 

I would think that drag radials would spin before anything breaks...wouldn't you?

 

Cryo sounds good. Remember what I wrote, that I broke a driveshaft, normally aspirated. That was just running backroads and autocrossing, not even drag racing (ok, once at the track, best of 3 runs 15.0xx)

 

The VW I wrote about was supercharged. Well, I just read today about a "stage II" Jetta putting out 400hp! That's more than our Maximas.

 

Its all in the design of the bottom end. Nissan tends to over engineer in that department so you shouldnt see any problems past 500 crank hp IMO. Of course im totally guessing but hey, Hondas cranks last up to 800 hp, you dont think a Nissan V6 will?

 

500HP you think it is good for that high? Seems a bit over but again I am just going by posts I have read. It would be sweet to see it up there though. I wonder what it would take.....


SuDZ

 

Th crank and main bearings, 500hp, sure no problem. The gurdle on the bottom of a VQ is very strong.

Rods and pistons, uhhhhhhhh no.

 

How is this done and what does it cost?

 

take tranny to shop. have them tear tranny apart.
send gears and shafts to cryo treatment place. they cryo treat parts and send them back to tranny shop. rebuild tranny. enjoy.

to understand what cryo treating is, do a search on it. you'll find a lot better description that way than one of us trying to describe it.

 

Visit www.onecryo.com www.cryoplus.com or www.cryogenicprocessing.com I got mine done at the latter.