Gearbox loud knocking sound r33 GTR

[Tomak]

Yes, Patrol Navara Y61 RD2.8. Maybe i wrote incorrect gearbox model i dont know.  He said just input shaft need to be modified and cut because is too long and thats it.

I am all lost in gear ratios. Can sobody explain what difference in car response can i get in Os Giken ratios and Patrol ratios?

I want to focus only on 1st, 2nd and 3rd gear.

Os Giken close ratio  1st - 2.695 2nd - 1.703 3rd - 1.236. 

http://www.neweraparts.com/Default.aspx?tabid=54&CategoryID=141&List=0&Level=a&productid=42

So the Patrol ratios goes in different direction than Os Giken so the car probably will have worse performance......?

7 hours ago, GTSBoy said:

The Patrol ratios are all shorter, not longer.  You will need to consider taller diff ratios.  If you're going to do that, then you should probably just do an R34 box.

I thought the Os Giken ratios are shorten for better acceleration so the Patrol has longer gears. Maybe in drift mode this does not have big difference but what in daily driving or track use? I just put inside Nismo Copper Clutch with light flywheel for better car response so i dont want to go back now for worse response on 1,2 and 3 gears......

I dont think to do any diff modifications for now, this is too much for me and i dont know where to do this anyway.

The OEM Skyline ratios are  1st - 3.214 2nd-1.925 3-1.302 1.000 0.752 ) 

Os Giken close ratio  1st - 2.695 2nd - 1.703 3rd - 1.236. 

Patrol Gearbox ratios

1st 4.556  

2nd 2.625

3rd 1.519

4th 1.000

5th 0,836

rev 4.245

[GTSBoy]

Smaller numbers are HIGHER ratio.....they are taller gears, not shorter. A 4:1 first gear is higher than a 4.5:1 first gear.

[Sick_R31]

Why not just buy a brand new gearbox? http://www.rhdjapan.com/nissan-oem-5-speed-manual-transmission-bcnr33-rb26dett.html 

[Tomak]

So as far as i understood Os Giken makes ratio for 1st gear 2.695 so you can probably do about 60mph at 8000rpm at have higher speed on first gear. So what speed i will have on Patrol gearset with ratio 4.556 on 1st gear? For me it means that i will have to change gears more often because gears are shorter now than from OEM gearbox now. Can sombody confirm this please.?

[Duncan]

Correct. The OS box lets you go faster in first gear although it will take longer to get there (as long as you haven't broken traction). The patrol option would get to 1st gear redline sooner but at a 20% slower speed. Patrol's focus was ability to pull heavy stuff from idle, OS's was to let you run a high power car with less gear changes. Horses for courses.

Of the options you have, I'd jump at the patrol option and see how it goes because your shop is familiar. Personally I think the OS gearset isn't a great option, if you really need a stronger gearset there are stronger options, although they cost 3-4x more.

[Tomak]

25 minutes ago, Sick_R31 said:

Why not just buy a brand new gearbox? http://www.rhdjapan.com/nissan-oem-5-speed-manual-transmission-bcnr33-rb26dett.html 

if i had only such a money to spend without fear of breaking it again.....sure no problem.

Ok lets test the Patrol option then and see how it goes from there. thanks!

 

[Tomak]

Hi,

Just the question about input shaft for gearbox for r33 GTR. 

Is this input shaft the same for GTR AWD and GTS RWD ?

I am wondering now if my mechanics put inside the input shaft from GTS as used part because i dont think that they had used parts from GTR

So if this fits no problem maybe the input shaft from GTS is less stronger so it broke so easy. I have done only 3000km after changing this input shaft and check this out what happened on the picture.

I paid them already once to change for me all synchros and bearings and main shaft almost 1000 USD

Then second time they changed form me this input shaft for used one for another 250 USD and now they are saying that it was used so it could broke any time..... So actually i could buy maybe new input shaft OEM for GTR and had my gearbox run for long time and this way they f**ked up my gearbox. I told them before it was 500hp not stock

So now they are building for me the gearbox for 3rd time for another 250 USD but free labor. Should i pay them this 250 USD or  tell them to go f**k yourself that i want this gearbox for free this time. I have invoices for both labors and parts issued from this company for the 1st and 2nd rebuilding. I  am really mad now for this what had happened. 

If this gearbox will break again on Patrol gearset i will tel them to go f**k yourself anyway and buy new one what else i can do? 

Also what interesting is when i asked them if this input shaft could not fit correctly. They said it would be not possible to drive that long and i would destroy this gearbox much faster but i  have done 3000km accelerating really hard sometimes on the highway.

Whats funny is that this broke on stable driving without almost any acceleration. Just put slightly pressure on the gas pedal on 4th gear. So what do you think about this? 

And just one more question. Does all this could happened because of light flywheel or not? I had OEM flywheel before. 

Thanks for advice, and here is my picture:

 

Edited January 9, 2017 by Tomak

[Sick_R31]

The input shafts are different between a gtr and gts, the gts-t and gtr are the same input shaft.

Paying them is up to you but having the gearbox in and out 6 time last year is beyond a joke.

That damage didn't happen because of the nismo twin plate coppermix.

You clearly sound like you don't trust your mechanic to do the work, i'd personally just buy a brand new and forget about the patrol gearset, unless you want to have the gearbox in and out 6 times this year as well.

[niZmO_Man]

Non-turbo gearbox is different to turbo gearbox.

*edit* oh R33 GTS4, not sure on that one but it's N/A lol.

[Tomak]

This all went wrong from the beginning, i just lost 1500 USD and 6 months of my time and all this just to buy new gearbox from Japan ;/ Damn it! This mechanic was trusted one, refered by my friend. I did not came to him from the street to a random shop.......and said hey buddy fix my gearbox from Skyline GTR.....they specializes in Nissan gearboxes for drift mode too. Now i can only cry  and accept my next lesson about Skyline hard way as usual. 

The first rule with this type of car should be. Alwas buy OEM new parts and thats it. One simple rule and life would be much easier. And now i can only blame the shop not the horse power or torque. I just dont know..... 

[Tomak]

Yo, i am running my car for 2 weeks now with Patrol y61 gearset. Feels no difference almost, just need to change gears faster from 1 up to 4, the 5th gear i have from Skyline so can go top speed. So it was worth the money, i just saved lots of money from buying new from Japan.

But i have a bad luck and need to take my gearbox out 4th time cuz the synchro from 5th gear grinds and nothing getting better after 2 weeks hahahahaha.....

I put all new synchros to my gearbox the first time the shop rebuild my gearbox so this is a joke and this is how it goes ;/ At least i am driving...need to take my gearbox out next week again. They are claiming now that the synchro got f**ked after taking out several times. Its funny that from 1-4 works good then, so what is the point?