I was driving home from work last night and did a 3rd gear pull to see where my AFRs where at. I wanted to do some fine tuning before going to the track this weekend. I downshift into third and ease into and a few seconds later I hear a faint pop and it felt like the tires broke loose, the rpms shot up and I pulled out of gear. Knew what happened right away, I guess I was expecting it to happen sometime but not so soon. Only 4th and reverse seem to be working, it wont go into any of the other gears except third but theres nothing there

 

357whp taking its toll. They say the 50A trans has a max torque input capacity of around 275 ft-lbs at the crank. Even NA I was around that "limit".

 

Where'd you hear that? I've never heard a figure quoted for it, that's interesting.

JeEvE that sucks man - believe me I know the feeling. PM me.

 

Wow sorry to hear that man. What's the plan for the replacement?

And yeah JClaw where'd you hear that #? Interesting...

 

I just need a trans asap, so I might just pick up an open diff at a local junkyard and throw that in with a 5lb wastegate spring for now...

 

Can't for the life of me find it, but it was SR20DEN that posted that in one of mardigrasmax's threads a while ago. It was about a 5-speed rebuild. He said the 6-speed was stronger and posted a link to Nissan Transmissions torque input capacity.

The 5-speed was 275 ft-lbs, the FWD 6-speed was like 325 ft-lbs and the 350z RWD 6-speed (MRA70) was 425 ft-lbs or so. I assume those are somewhat "safe" limits.

 

cool i'll have to ask him if i ever see him online again.

 

Very interesting info on the trans'. Hope you get the car back together quickly!

 

sorry to hear that man....i know what its like to have a tranny suddenly die on u when going into gear.


maybe someone might have a spare tranny to give to u.

 

found it myself after about an hour of searching - very interesting and nice that aichi lists torque capacities on their site - which by the way is listed at about 280 N-m which is 206ft-lb... so if you add 2ft-lb of torque you're past the transmissions design capacity lollerskates

http://www.aichikikai.co.jp/english/mission.html

BTW the evo MR and IX 6spd is rated at 295 ft-lb (these have quite small 3rd through 6th gears), and the 350z is only rated at about 306lb-ft heh.

 

It's sad to know that the ratings are so close to the stock outputs of the cars that use them

 

It's been too long - thought it was torque. Damn overcomplicated power measuring methods. There should only be HP and TQ

I would like to know what, say, a T56 is supposed to handle. Certainly not something like 600whp like some put through them.

And technically the 5th gens (217 ft-lbs) surpass the max torque for a 5-speed. Imagine our autos now

More pressure to stay N/A.

 

Sucks man. Shifting into 3rd was always a time to hold my breath.

 

Those numbers IMO aren't correct. The 350Z trans can handle way more than 425 ft/lbs at the crank. My friend Brian always tells me how well the trans and diff are in the Z.

 

T56:
http://www.ttcautomotive.com/English...s/T-56.asp#Car

Neal might be the "expert" on this subject, but it appears that trans ratings from the mfg. are relatively conservative.

 

You should read the rest of the thread jason lol

 

That sucks man, you have been turbo on that tranny for how long?

Question on tranny fluids. Do you guys use the redline lightweight shockproof fluid; IIRC 75w-125 or do you use the heavyweight. the heavyweight seemed like glue, i don't see how that would be good in the tranny.

 

Don't put any shockproof in your trans is what I've been taught. Redline specifically says it is not for use in synchromesh transmissions.

 

Yeah, when me and jcy98 went to our friends shop, he was like WTF when we asked him about it. Just making sure. How would mixing a bottle of the lightweight shockproof in affect it, or help. Just want to protect the tranny as long as possible with out building it.

 

I don't believe it would make any noticeable difference.

 

I hear the Pennzoil Synchromesh gear oil is some very good stuff. Its like the GM stuff but a little cheaper and is suppose to make a pretty big difference compared to regular gear oil. It is also compatible with yellow metals so you don't have to worry about screwing up the syncros.

I'm about to try some in my Z32 but it has over 200k miles so the synchros are probably too far gone to make a noticable difference. When I get my Maxima running again I'll probably put some in there as I will definitely be able to notice changes in that.

 

I have used pennzoil synchromesh, it's actually GM synchromesh with a different label (made in the same facility, etc). I liked it, worked just fine. I have royal purple in there right now because last time I did a trans change I found two quarts of royal purple in my garage from a couple years ago so I just went and bought 3 more. That is working great too.

 

so i wonder what the V160/V161 is rated at. I know those supra guys are pushing major hp/tq through stock 6spds. I know ryan woon is running a stock 6spd in his 8 second supra, along with several other 800rwhp supras.

on another note its kinda sad at how low our trannys are rated at. does anyone know if hal(hlh0501) was running a stock 5spd, and how long his lasted? i know he was makin some serious power too.

 

Neal can answer that.

 

He went through quite a few transmissions - i own his car now.

the stock supra Getrag is a very strong transmission, the gears in that transmission dwarf the ones in our transmission.

 

I never knew you bought hals turbo max. I loved his maxima, ever since i saw his first video.

i agree with the V160/V161. I rarely hear about any stories on supraforums about them blowing there transmissions. there whole drivetrain is bullet proof. 2jzgte and the V160/V161 is a damn good combo. I guess thats why the 2JZ and the V160/161 are so expensive. (last i heard a 2jzgte & 6spd conversion on a n/a model would end up running you a good 15k)

 

Since when is ShockProof bad ? Got any statistics on that ? I have been using ShockProof on my 5th gen since 67K miles- when my 4th gear exploded in my OE tranny. I rebuild it and at 100K miles I ended up getting a free one from Nissan through a "hook" up. So my NEW Nissan tranny has about 70K miles on it, and that is ALL Redline ShockProof MEDIUM. It shifts like no other 5spd Maxima tranny I have driven..... I have 5 manual Maximas sitting in the shop right now waiting for work so I have plenty to compare it with

SE-R trannies are worse than ours and they I belive are rated at up to 150LBs and people put 250TQ through them, they last but then again there are idiots out there that can destroy anything......

Don't talk to me bout input shaft bearings and Maximas.... I have my own theory.

 

Since forever - the paraffin emulsion in the fluid will centrifuge out and gum up synchros, the inside of shafts, oil passages, etc. It becomes exactly the consistency of peanut butter. So two things happen - 1) the stuff loses it's "shockproofing" qualities over time, and 2) you get this gummy substance all over everything inside the trans. I've seen it more times than I can count that guys send in their transmissions that aren't shifting well or at all and then I open the thing up and it's totally gooped up.

No one is saying that the transmissions can't take more torque than their manufacturer rated torque, but we are saying that they can't take all that torque that some people are throwing at them. Shocking the hell out of the transmission on shifts only serves to exacerbate the problem.

 

i am Selling a 1999 VLSD tranny if your interested.

 

he's already got a tranny from tilley, i just helped him put it in.

 

Thanks for the offer Zack.

Got the car running again, got the tranny in before work with help from abci30. I got a rebuilt from Tilley, thanks to Tom (Mymax97) for bringing it back so I didnt have to go all the way up to Tilleys.

Dont have the turbo setup in right now, i have to get an o2 bung relocated and another welded in for the wideband... it just feels so weird with no boost

 

I've had more Maxima trannies apart than anyone on this forum probably, and my tranny is not gummed up at all. I was turned to ShockProof by no other than Mike Kojima who runs this stuff in his Sentra SE-R cup car. He ran that on the stock tranny and now on his dogbox tranny with no problems. I change my tranny fluid quite often as I drive alot. I won't stop using it, I have had great sucess with it on Hondas and Nissans.

 

Cool, if it's working for you then that's good - I can only advise on what I've seen personally. Based on what I've seen I won't be using it, I've had quite a few transmissions apart as well (probably on the order of 400-500 DSM and Evo transmissions, averaging about 8-10 a week for the past year now that I've worked there) and I've seen it in a number of them. Before I'd ever seen it myself I was advised against it by my boss who's taken apart thousands upon thousands of transmissions at at the trans shop he's owned for the last 12 or 14 years or however long it's been since he opened it. It wouldn't have the effects I described on a dog trans (at least not on the shifting action, being as they don't have synchros).

 

Redline does say its not for synchros but if your changing it often it should be okay because it prevents it from gumming up.

 

hows the tranny working out for you. Is it making any noises in first?

 

So what would you reccommend besides what your using already.. Redline MT-90? Also can you still get a quaife diff?

 

My boss is a big fan of MT-90, BG Synchroshift2, Pennzoil Synchromesh (same as GM synchromesh). Personally I have Royal Purple in my trans right now, because I had two quarts already in the garage left over from a couple years ago. I'm happy with that, and was happy with the Synchromesh I had in there previously. I will probably put MT-90 in next. BG Synchroshift2 is pretty slippery, makes the shifting action buttery smooth, MT-90 has a bit higher film strength than BG he said, which makes it good for higher power to prevent scoring on the gear faces. I don't really know where the Royal Purple falls in there as far as film strength, when I asked my boss about it he basically just said Royal Purple isn't bad oil, but for the money he'd rather see me put MT-90 in there.

 

MT-90 it is. I was just confused by the whole schockproof ones, because I know people run it, including mardi, but I see your point your making by using it. If you still can get a quaife diff let me know if you would via PM if you'd like. I appreciate it Nealoc

 

No noise in 1st. Everything seems good, shifts nice. Seems a little hard to pull out of gears but it has gotten much better.

I decided to use Pennzoil synchromesh and it shifts very nice, a little better then MT-90.

 

well thats good to hear man. Lets just hope that it holds up to the power and 3rd gear test!