Jump to content
SAU Community

Recommended Posts

Heyas

I currently have 220kw on a stock gtr box which has a nasty synchro problem, (crunches 2nd, 3rd and 4th, very hard to shift into 1st at low motion). It had the shockproof oil in it when bought, whether that was the cause of the sync issue or an attempt to dampen the effect, I don't know. I only run mineral oil/semi synthetics in my boxes personally, not a fan of smurf blood.

I mainly street the car. I occasionally launch it and I do a little bit of drag racing too, but not much. Most of the time I'm just doing the usual driving, but I do like to have the gearbox change gears as quickly as possible (bear in mind that I have to be really gentle nowdays so I dont grind so much..).

Thing is, I'm gonna get new turbos and some other minor mods to try n get the engine to give me 300kw. Now, with that sort of power would the stock gearbox gears/synchros handle that enough? Depending on the answer to that, do I get a 2nd hand box, or just get my existing box's synchros/gears changed? I'm not aiming for anything super hardcore, but I don't want to spend any unnecessary cash...

Any suggestions would be greatly appreciated! :)

-D

Edited by Dohmar

I'm running around with a 2nd hand R32 GTR gearbox in my car that has over 370rwkws and has run and won Dutton rallies which have over 70 lauches along with circuit work and 800m drags over 3 days and its never missed a beat.

Having said that when I 1st got my car I broke 2 gearboxes in the 1st 6 months I had it before I learned to drive.

Getrag from a r34 GTR ftw!!

close ratio, nice and strong, synchro and 6 speed!!!

i think with whatever diff ratio i have it works out quiet nice, for street driving, track days and for the launch!

tho 60' times suffer a little but i'm not into drag racing at all.

I'm running around with a 2nd hand R32 GTR gearbox in my car that has over 370rwkws and has run and won Dutton rallies which have over 70 lauches along with circuit work and 800m drags over 3 days and its never missed a beat.

Having said that when I 1st got my car I broke 2 gearboxes in the 1st 6 months I had it before I learned to drive.

Thats pretty reassuring.... I think I'll stick with the 32 box, the 6 speed would be nice but I'm trying to keep it as inexpensive as possible.

So I'll probably get my current box reconditioned with new synchros, might cost me more than a straight 2nd hand box but at least I'll know its good for a while... that is unless someone out there is selling a 5 speed which they know is in good nick :P

thanks for your help guys... appreciate it!

-D

Getrag from a r34 GTR ftw!!

close ratio, nice and strong, synchro and 6 speed!!!

i think with whatever diff ratio i have it works out quiet nice, for street driving, track days and for the launch!

tho 60' times suffer a little but i'm not into drag racing at all.

I'm not so sure about that. it's a nice street box, but lots of serious 34 GTRs I know of switch back to the 33/32 type boxes for any track or drag use.

edit: see snowmans post above...

I'm not so sure about that. it's a nice street box, but lots of serious 34 GTRs I know of switch back to the 33/32 type boxes for any track or drag use.

edit: see snowmans post above...

Yerrp this is true, tho there are some big hp 34's that still run the box too.

tho then again mines got nismo goodies inside it.

Series 3.5 R33 GTR boxes have better synchro's.

3200 from just jap

would like to know more dude, i know nowt about about synchros but thats where my problem lies atm.... theyre 18 yrs old, shagged and i need a good shift up to 300 kw....

-D

Yerrp this is true, tho there are some big hp 34's that still run the box too.

tho then again mines got nismo goodies inside it.

the 'nismo goodies' is just an upgraded input shaft. the stock getrag shaft has been known to twist especially when you have decent power and a hard core clutch. so nismo when they desinged a clutch kit added an upgraded input shaft to it. you get the input shaft when you buy a nismo 34 GTR clutch. but it doesn't do anything for the strength of the gears or the ratios, or the synchros. it's just one short little shaft that send power into the front of the box that is changed over. I would say whoever was using the box before you was using a nismo clutch with it hence the reason it had the input shaft in there from the clutch kit. :D

Save yourself a bucketload of money and drop in a second hand GTR box.

GTR boxes should not be rooted with only 220kw.. Rb20 boxes shit themselfs and do in bearings and strip gears at that power, not GTR boxes

Perhaps previous owener just abused it?

How do you drive it? Heal and toe? Double clutch?

thats my 2c

Edited by GTS4WD
Save yourself a bucketload of money and drop in a second hand GTR box.

GTR boxes should not be rooted with only 220kw.. Rb20 boxes shit themselfs and do in bearings and strip gears at that power, not GTR boxes

Perhaps previous owener just abused it?

How do you drive it? Heal and toe? Double clutch?

thats my 2c

I do a little bit of heel/toe when going around a corner but really not much. I just drive around the city and try not to draw attention to myself. I've never double clutched (dont know anything about it). The previous owner did abuse the shite out of the box which is why they had the redline shockproof gunk in it. Its mainly the synchros which are rooted, the gears themselves feel really good. Just shifting into gear after acceleration can cause the grind... if I let the engine rev down to 3-4 it usually slips in OK but anything above 4k is grind city... Im mainly just curious cause the extra power I want to draw later on when I get turbos replaced. I don't think I need the OSG kit at all, and if the stock GTR boxes are as ballsy as their reputation leads me to believe, then I should be ok. Bear in mind its an 18 yr old gearbox which has undoubtably been thrashed out by its previous owner... thats the way I look at it at least. So if I can get a decent 2nd hand box I should be ok.... otherwise its synchro+thrust bearing replacement (which is probably more expensive?)

Not too sure really...

-D

A lot to do with the clutch. Get a solid centre POS clutch that will break your gearbox, get a cushion center clutch that wont send shocks through the gearbox and its much harder to break.

R33 GTR Series 3 gearboxes have a bit stronger syncros. You can buy them brand new from justjap or nissan for about 3.2k. Or stick a 2nd hand 32/33 GTR box in for a grand or so.

A lot to do with the clutch. Get a solid centre POS clutch that will break your gearbox, get a cushion center clutch that wont send shocks through the gearbox and its much harder to break.

R33 GTR Series 3 gearboxes have a bit stronger syncros. You can buy them brand new from justjap or nissan for about 3.2k. Or stick a 2nd hand 32/33 GTR box in for a grand or so.

Yeah I got a 6puk Jim Berry clutch on its way for when I do fit the replacement box... with my old box, would it be worth selling as a shagged box to someone or getting it fixed incase I stuff up the replacement? Going to go with a stock 32 box, cant really afford 3.2k

-D

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


  • Similar Content

  • Latest Posts

    • I think the concept is highlighting the various scenarios where thicker oil helps, and thicker oil potentially doesn't help and only generates heat and costs power, in turn for safety which isn't actually any safer (unless you're going real hot). If anything this does highlight why throwing Castrol 10w-60 for your track days is always a solid, safe bet. 
    • Jason should have shown a real viscosity vs temp chart. All the grades have very little viscosity difference at full operating temperature.
    • Oops... I meant to include the connector  view... BR/W - power from fuse L/W - motor negative to fan control amp (and off to HVAC pin19) OR/B - PWM signal (from HVAC pin20) B --  ground  
    • Yep, if you are applying filler it sounds like there is something wrong with the body lol. Safe to assume there is going to be a lot of sanding going on if your still applying fillers.  Picture a perfect bare metal panel, smooth as glass. You lay down your primer, it's perfect. (why are you going to sand it?) You lay down the colour and clear, it's perfect. No sanding at all took place and you've got a perfectly finished panel.  You won't be chasing your tail, sounds like you were prepping to start laying filler. If your happy with the body after the sanding, there is some bare metal exposed and some areas with primer, no issues at all, start laying the filler. You are safe to lay filler on bare metal or primer (of course check your technical data sheet as usual for what your filler is happy to adhere to).  This isn't a 100% correct statement. There is primer that is happy to adhere to smooth bare metal. There are fillers that are happy to adhere to smooth bare metal. Just make sure you're using the right materials for the job.  Typically if you are using filler, you would go primer, colour and clear. I've never seen any instances before where someone has laid colour over body filler (maybe this happens, but I haven't seen it before). So your plan sounds pretty normal to me. 
    • I don't think there's any way someone is push starting this car.. I honestly can barely move it, and moving it and steering it is just flat out not possible. I'm sure it is, but needs a bigger man than me. I have a refurbished starter now. The starter man was quite clear and consise showing me how nothing inside a starter really should contribute to slow cranking, and turned out that for the most part... my starter was entirely fine. Still, some of the wear items were replaced and luckily it didn't show any signs of getting too hot, being unfit for use, etc. Which is 'good'. I also noticed the starter definitely sounded different, which is a bit odd considering nothing should have really changed there.... Removed and refit, and we'll pretend one of the manifold bolts didn't fully tighten up and is only "pretty" tight. GM only wants 18ft/lb anyway. I also found a way to properly get my analog wideband reading very slightly leaner than the serial wideband. There's Greg related reasons for this. The serial output is the absolute source of truth, but it is a total asshole to actually stay connected and needs a laptop. The analog input does not, and works with standalone datalogging. Previously the analog input read slightly richer, but if I am aiming at 12.7 I do not want one of the widebands to be saying 12.7 when the source of truth is 13.0. Now the source of truth will be 12.65 and the Analog Wideband will read 12.7. So when I tune to 12.7 it'll be ever so slightly safer. While messing with all of this and idling extensively I can confirm my car seems to restart better while hot now. I did add an old Skyline battery cable between the head and the body though, though now I really realise I should have chosen the frame. Maybe that's a future job. The internet would have you believe that this is caused by bad grounds. In finding out where my grounds actually were I found out the engine bay battery post actually goes to the engine, as well as a seperate one (from the post) to the body of the car. So now there's a third one making the Grounding Triangle which is now a thing. I also from extensive idling have this graph. Temperature (°C) Voltage (V) 85 1.59 80 1.74 75 1.94 70 2.1 65 2.33 60 2.56 55 2.78 50 2.98 45 3.23 40 3.51 35 3.75 30 4.00   Plotted it looks like this. Which is actually... pretty linear? I have not actually put the formula into HPTuners. I will have to re-engage brain and/or re-engage the people who wanted more data to magically do it for me. Tune should be good for the 30th!
×
×
  • Create New...