Jump to content
SAU Community

Recommended Posts

Hello everyone. I own a r32 gtr thats highly modified. But no gear box mods. For the first time I'm braking Mt gear box one right after the other. I drag race and over the years I have been building more and more power. After my first gear box failure I right away ordered 3 extra gear box.

On a side note I drag race on the air port strip that has no track bite. I keep on breaking 3rd gear no matter how easy it try to shift the gears. I'm simply tired of this. Here is my question.

 

What do you guys think would be the easiest and cheapest way to hold the stress I'm putting on these gear box. What's crazy is on my lowest setting 10psi I'm breaking by gear box. Like wtf.

I drive hard and I'm unforgiving in hoe I shift. Would a PPG get set work or would your guys recommend a full sequential box. Can anyone provide links to the parts I'll need. I'm simply sick and tired of these box problems.

Link to comment
https://www.sau.com.au/forums/topic/469963-keep-breaking-gear-box/
Share on other sites

The PPG gearsets are pretty good but rely on the stock housing / shaft sizes and positioning - ultimately this is what limits the strength of the box as material improvements can only take things so far. The feedback from PPG owners is normally positive (and it should be given the price!) but given what you are saying the OS-88 might be the way to go as a "do it right the first time" approach.

if you are looking to shave even more time off your timeslips while assuring that you aren't spraying gearbox parts everywhere (and I know I am going to be accused of heresy for this..) a built powerglide and suitable converter might potentially be more suitable for your current & future requirements in the end and for less / similar money as trying to put together a bombproof 5speed or going OS-88. 

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

If you're gonna spend the amount of coin to go down the PPG dog set, I think you're crazy not to spend the extra little bit more and get a 6 speed of some sort.

A couple years ago I was in a similar situation and after 12 months of debating, I chose the OS88. It woke the car up heaps... the extra cog is worth its weight in gold.

Getrags seem to hold up very well, perhaps that's an option to look at? Anything "higher" then that is crazy money, irrespective of what you decide. It's a bugger of a spot to be in.

  • Like 1

Thanks for that link mate.
I was wondering has anyone used the os giken close ratio gear set. Looks like a Cheap in between budget build. I see that's offer from rhdjapan with center plate for around 2800 usd. It's just a thought.

If you're gonna spend the amount of coin to go down the PPG dog set, I think you're crazy not to spend the extra little bit more and get a 6 speed of some sort.

A couple years ago I was in a similar situation and after 12 months of debating, I chose the OS88. It woke the car up heaps... the extra cog is worth its weight in gold.

Getrags seem to hold up very well, perhaps that's an option to look at? Anything "higher" then that is crazy money, irrespective of what you decide. It's a bugger of a spot to be in.

 

 

Yeah. I totally agree, as bad as I hate the idea of going down this road. I feel I have no choice. I was just putting some ideas out there to see if there was a cheaper solution, but seems like there's none. Forgive me if I sound uninformed at times. I have never been in this situation before. Drive line issues. What a drag. How did your install go with the os88 if you don't mind shinning some light on the situation. I'm planning on sourcing one from rhdjapan. Also did yours take the 4 months there saying it takes to build. ??

 

43 minutes ago, MJTru said:

Thanks for that link mate.
I was wondering has anyone used the os giken close ratio gear set. Looks like a Cheap in between budget build. I see that's offer from rhdjapan with center plate for around 2800 usd. It's just a thought.

I busted a second gear.

You need a torquey car to get the best out of those tall ratios. Cheap enough but not THAT strong. Many guys on here have busted them.

IMG_2887.JPG

11 minutes ago, MJTru said:

 

 

Yeah. I totally agree, as bad as I hate the idea of going down this road. I feel I have no choice. I was just putting some ideas out there to see if there was a cheaper solution, but seems like there's none. Forgive me if I sound uninformed at times. I have never been in this situation before. Drive line issues. What a drag. How did your install go with the os88 if you don't mind shinning some light on the situation. I'm planning on sourcing one from rhdjapan. Also did yours take the 4 months there saying it takes to build. ??

 

Mine took 8 months from full payment to receiving it. You also have to pull it apart and fix up the oil breather. YOU HAVE BEEN WARNED! I have made a post about it all.

The car will be back on the road in a month or so's time. I've so far only done 100 ish kms in it. 

I busted a second gear.
You need a torquey car to get the best out of those tall ratios. Cheap enough but not THAT strong. Many guys on here have busted them.
IMG_2887.thumb.JPG.eeeb3ad993b81e4501b1a751879376d7.JPG



I have made my mind up. 88 is the way.
I see you mention in another thread the oiling problem and a cover that was needed for the breather hole. How did that go.? Your good now. Also have a photo of what you did.? Would be helpful. Also the sensor in the box what was your reason for moving it.?
Just now, MJTru said:

 

 


I have made my mind up. 88 is the way.
I see you mention in another thread the oiling problem and a cover that was needed for the breather hole. How did that go.? Your good now. Also have a photo of what you did.? Would be helpful. Also the sensor in the box what was your reason for moving it.?

 

 

I don't have the after photos unfortunately. Basically a cover plate went over the breather.

The gear position sensor got changed for something more modern and to be used with a strain gauge nob. The factory one is just a bunch of "switches".

 

2 hours ago, MJTru said:

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

Yes they certainly are able to be done in 4WD - RIPS had a nice setup a while ago in their MEGAWOT vehicle running into the 7's and there are a few companies who make RB AWD adaptors for the powerglides locally (KEAS and a few others). I only suggest the powerglide as they are fairly cheap to build tough (in comparison to other options) and help with getting the car off the line a lot smoother and more reliably than most people can manage with a manual.

2 hours ago, MJTru said:

I really hate to go power glide as I still.want the car to be some what streetable. I'm wondering if I do the gear set and center plate of that will be the solution, as I don't feel I'm making enough power to need a os88. Especially at 11k plus. and a turn around time of 4 months. Here is another queation. If I do go powerglide can I still keep the 4wd system. And where do I source this kind of setup from. ??

Rips has built an AWD powerglide. I don't know if he will share the info with but you could try. He would probably sell you a built up unit though.

  • Like 1

I have 3 cars that are all 4wd vehicles. The 2 gtrs I really like. So I might just get 2 os88 for those 2. The other one is a mix up machine. It's a gts4 with all gtr parts. All 3 cars are good for about 700 to 800 hp very easily. So I will have to find a cheaper solution for the gts4. Out of a gear sets and a centerplate being os giken. I might as well try the os close ratio gear set for 2800 from rhdjapan japan. The gts4 runs small wheels and street tires so they tend to spin. I think that helps with stress on the drive train. The power glide will be my very last option. After I checked around that's about 10k plus for the complete setup.

I love how in your other thread you were trying to fit the cheapest shitest wheels around but now you are talking of buying 2 boxes that are worth about 18k aud each plus another box worth around 3k like it's nothing at all

  • Like 2

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

    • Oh, that's grim. Something bad has been happening there.
    • Put an endoscope down the hole and saw this. Not quite all around the bore but a good 60% at least. Chin to the chest and towards further disappointments I guess.
    • 2 does "sort of" applies, maybe......but looking at what parts would be needed for the swap to get engineered, registered, and insured, and basically that's everything under the car, the modifications the make it legal would be problematic and horrendously expensive, all for a street car that just cruises around and hits a few twisty roads on the weekends Also, from looking at the NSW rules and Regs, with all modifications that is required just to make the car safe and not twist itself to pieces, and then actually get registered for street use, may still be impossible nowadays As for 1, when you add in a fresh engine, fresh transmission, rear cradle and diff, tailshaft, suspension, brakes, cooling, and all the other fabrication required, your probably looking at up to $100k to do it right, all for a 20 year old MX5 that is over engineered and you would never be able to actually use the power it has on the street, much like your beastie, which I love, but you actually track that thing and can use all of its powers in anger, in a safe environment  Hell, the old Bogan Cruise Ship had more power than I could use on the street, and in hindsight, I went a bit silly on that thing, it didn't really need the 500hp it had for what I actually used the car for, it was fun, but basically unusable on the street if you value your licence  As for cams, yeah, I'll probably book it in for them to get installed and tuned soonish, like next month after MX5 Mania are back at work....... and yes, I've already sent a email to bin the turbo quote and quote instead to install cams and a new Fluidampr balancer that will suit the 2.5 better than the OEM 2.0 balancer that is swapped over for the 2.5 install, as the balancer needs to get pulled to time the cams it's a while your in there sort of thing I did think a bit about flex fuel for a laugh, but being na, and no where really around locally anymore to get E85, I've binned that idea, so no sweet sweet corn smells are set for the car I wish E85 was more of a standard fuel, it's better for the environment, better for tuning, plus that sweet sweet smell we all love As for fitting in the family, that's not needed, as everyone in the family already owns a car that can seat 5 humans comfortably enough, the MX5 is "my toy" As for buying a car that is already built, nah, I would rather pick and choose my parts, I enjoy the process, and in the big picture, the additional cost is well worth the enjoyment, and the occasional frustration, I get out of doing it, albeit with other people spinning the spanners, and me, just paying the invoice 🤣
    • Excuse me, but 2) does apply 1) Would also apply if you consider how much is spent in the alternatives. Also there's the option of 3), buy one pre-built that you can put your family in (it's me, it's my car)   That said, I went on a ~500km drive the other day. I didn't use anything more adventurous than 3rd/4th gear at about ~3000RPM and 50% throttle and I was going as fast as anyone has any sense doing on a public road, with enough grip to the point where I didn't want to go any faster. I was obviously under the limit of the current car etc etc. MX5 with 2.5 N/A to achieve the same speed would be more fun for any road scenario. Maybe consider cams. I wouldn't boost it. The use case is just not there and it won't actually make the car more enjoyable unless you really do plan on wringing gears from 1st to 3rd (at least) at 100% WOT on a public road to 150+kmh.
    • Great if: 1. You had all of the money for everything else that is required  2. Lived in a country where you could actually do this and drive it legally on the road Sadly, neither applies to me As for the turbo, I am having second thoughts, mainly for engineering/registration legality reasons and insurance  Not saying I've finished doing stupid things that I probably should do to the MX5, but boost, and V8 engine swaps isn't on the cards Strange, but true 
×
×
  • Create New...