Jump to content
SAU Community

Brand New R33 Gts-T Gearbox - Crunch Into 4Th?

boxheadmr
 Share

Recommended Posts

STATUS Grand Master

STATUS

Posted
Posted

is it a conversion? i would look at alignment as 4th is straight through.

Its a long shot but i had a r33 come in for an assessment as it was still crunching 4th and no-one could trace it, the customer had it built twice by the shop that did all the work and it still crunched.

I pulled the box and noticed it had no dowels.... for shits and giggles i fitted a set and bang..It turned out to be simply missing dowels... odd as i hadn't seen it before but was a nice 40min fix.

The Dan Grand Master

The Dan

Posted
Posted

Shit yeah, if it's a conversion that could definitely be your problem. Also those are notorious for overthrow of the clutch due to mismatch master/slave cylinders so you get massive throw on the slave causing the clutch fingers to invert on disengage.

I know you are saying it's only in 4th but sometimes its one gear where you'll press the clutch further than normal.

The other problem is 4th is driven straight down the main shaft so sometimes a slightly bent clutch plate or missing/incorrectly installed spigot will cause more problems in that gear than others and especially at high revs when it's critical for the box so slow down quickly for a smooth shift.

For the fans reading at home, what is the history of the car? Why the new box and what's been done to the car?

boxheadmr Mentor

boxheadmr

Posted
  • Author
Posted

interesting around the clutch, running OS Gekin twin. Yes it is a conversion but have checked the input shaft to std box center and it is spot on.

I would have thought the crunching was the clip that has been mentioned in other threads,

The Dan Grand Master

The Dan

Posted
Posted

interesting around the clutch, running OS Gekin twin. Yes it is a conversion but have checked the input shaft to std box center and it is spot on.

I would have thought the crunching was the clip that has been mentioned in other threads,

The shift clip? Not in a new box. It shouldn't be that

It's not a height issue for the clutch. What I meant was you might be getting too much throw in the fork and it over-engages the clutch and reapplies pressure.

There is also the possibility of the gearbox being stuffed from the get go but you'd need to have it apart to check synchro clearance and the action of the shifter

Birds Grand Master

Birds

Posted
Posted

May not be a fix for your issue, but I don't like running synthetic oils in these boxes, they tend to result in synchro issues. Never a problem from plain old 75w90 mineral, which is what they were designed to run on.

As above, gearbox may well be stuffed from the get go, all it takes is a knock in transit to dislodge parts of the synchro hub assembly and presto, you have a crunching gear.

I usually start with the cheapest fix, which is trying a different oil. Did your new box come with a factory parts warranty?

boxheadmr Mentor

boxheadmr

Posted
  • Author
Posted

not 100% sure the issue would not at least in some way show under minimal or even regular load if it was something to do with the clutch and also in any gear under load.

I am going to drain the castrol fluid i put in it with a filter sock to have a good check for parts in it and replace the oil with redline to see if that makes a difference although i am skeptical about oil making a difference. If it was stuffed from the get go then the problem would have presented itself earlier i would have thought.

I am sure i could go back to nissan but the car is not exactly standard so doubt they would be keen to do it "under warranty".

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Well you wouldn't get Nissan to rebuild it... So unless they did it under warranty you'd be up for another one.

If the oil doesn't show anything up - perhaps go talk to Nissan and explain you've hardly used it and see what they say.

If nothing good comes of the conversation time to get a professional (or two) to inspect it and maybe report back, could well be a transit issue as stated.

Birds Grand Master

Birds

Posted
Posted

not 100% sure the issue would not at least in some way show under minimal or even regular load if it was something to do with the clutch and also in any gear under load.

I am going to drain the castrol fluid i put in it with a filter sock to have a good check for parts in it and replace the oil with redline to see if that makes a difference although i am skeptical about oil making a difference. If it was stuffed from the get go then the problem would have presented itself earlier i would have thought.

I am sure i could go back to nissan but the car is not exactly standard so doubt they would be keen to do it "under warranty".

Why put Redline in to mask up the issue? That's what you do with a half dead box that you want more life out of. These boxes should be able to run fine on mineral 75 or 80w90.

boxheadmr Mentor

boxheadmr

Posted
  • Author
Posted

R31Nismoid

Yeah i think the plan might be to do the change and see how it goes, not going to the track again for a bit as funds a little low so might look to do some private testing if possible to see if the problem presents itself. Next option is to pull it down and inspect further.

Birds

i am not currently running a mineral oil, i am running a synthetic currently and thought whilst i drain the fluid to check for any particles i would change to another oil which is meant to be good for fast shifting with synchros.

krzysztof

If the clutch fork was bent i would imagine that this problem would occur across a number of gears and at different speeds and conditions.

boxheadmr Mentor

boxheadmr

Posted
  • Author
Posted

another thought is that the shifter is a little offset from the normal SR box position and more forward, we customized the shifter to get it into a better position and it could be as simple as me needing to change gears better and when i try to change quickly between 3rd and 4th i am slightly off causing the crunch.

Birds Grand Master

Birds

Posted
Posted

Birds, i thought it would be good to check the oil first and at the same time change it.

So change it for a $30 mineral oil instead of wasting your money lol.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • BaronOBeefdip
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By BaronOBeefdip · Posted

      Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Bwagz
      Engine model

      By Bwagz · Posted

      Thanks for that, hadn’t used my brain enough to think about that. 
    • MBS206
      R33 GTR running -9 with no tune

      By MBS206 · Posted

      Also playing with fire if they start to flow more air down low than what the stock twins can. It's not even up top you need to worry, it can be at 3000rpm and part throttle and it's getting way more flow than it should.
    • Piggaz
      Garrett G Series

      By Piggaz · Posted

      Any G40/1000 or G40/1250 results out there?  
    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      You still want a proper tune on the stock ECU though. Stock tune + stock ECU with GT-SS/-9s is probably playing with fire if you're running more than stock airflow/power.
×
×
  • Create New...