Os Giken 5 Speed Vs Ppg Straight Cut/helical Cut Dog Gears Vs Sequentials

[GTRPSI]

After months and months of research, I've decided to go the OS88. Went for a drive in one and it was awesome. Quiet in gear, bit of clunking between gears but who cares about that, 4 choices of ratios and 6 speed. It also bolts straight into a R33 GTR so no shaft/transfer case changes.

It won't happen this year, but it'll happen.

We ended up with a Quaife/Trust 6 speed straight cut dog box, will be interesting to see how long it holds up.

My money is on the input shaft going first.....

[NXTIME]

GTRPSI: Be careful with the reverse gear on the Trust. It's only 18mm wide and the idler gear is smaller still. They have a tendency to not want to engage properly and the idler teeth are easily ground off if not engaged fully.

What shifter are you using on the Trust? How much power do you have?

Top choice, Piggaz. I'm in the same boat with the OS88 - it will happen eventually.

[Piggaz]

We ended up with a Quaife/Trust 6 speed straight cut dog box, will be interesting to see how long it holds up.

My money is on the input shaft going first.....

Straight cut is never an option. UNLESS, there is the top gear is helical. Freeway driving is important to a few guys in this thread.

How noisy is it. Can you take some videos?

[NXTIME]

[boobeedoobee]

I was leaning towards a PPG straight cut dog box.. thoughts on that one?

[GTRPSI]

GTRPSI: Be careful with the reverse gear on the Trust. It's only 18mm wide and the idler gear is smaller still. They have a tendency to not want to engage properly and the idler teeth are easily ground off if not engaged fully.

What shifter are you using on the Trust? How much power do you have?

New reverse gear has been fitted (guess why), and its a H pattern.

PT7175 on a 26/30 with E85, what power i plan to get and what i really get may be 2 different things, so no results to speak of yet as engine bottom end is going through assembly right now.

How noisy is it. Can you take some videos?

Just got it minus the transfer case, im going to rearrange the plates in our old transfer case (transfer case mod) and bolt it on, its been rebuilt, sitting near me right now waiting for the new engine to be finished.....

Spent yesterday gaping the rings, bottom end should be assembled next weekend when i find some time.

Not intended as a daily, more a 1/4 mile and Saturday night special, just put some ear plugs in if too loud.

Edited May 26, 2014 by GTRPSI

[Piggaz]

I was leaning towards a PPG straight cut dog box.. thoughts on that one?

A lot of people use them with what seems great success. That second gear is almighty tall though.

The BC Automotive GTR was using one.

[NXTIME]

GTRPSI, I would suggest you get a gear shift lever made up as the stock bush type one doesn't help reverse (the main reason they get damaged).

[NXTIME]

I have a video of mine at the drags with the Trust dog box on Dandan Automotive's facebook page. Whiiiiiiiiiine

[GTRPSI]

GTRPSI, I would suggest you get a gear shift lever made up as the stock bush type one doesn't help reverse (the main reason they get damaged).

Can you elaborate on the getting a gear shift lever made up?

I was unaware of that issue....

Thank your your wise words.

Will hunt for the clip later tonight.

[NXTIME]

PM sent

[JimmyRickard]

What are the options as far as straight cut dog boxes go?

I found a PAR dogbox for sale on ebay that was going pretty cheap, but apparently PAR's boxes are shit.

I hear Quaife/Trust are pretty good, but parts are hard to source.

And of course PPG, which are good but pricey.

Any other options out there?

[Piggaz]

I went out and spoke to Terry at Award A few months ago. He said there are two new options for us. Both are dog boxes and 6 speed I believe. That's all the info I have. It might be worth while giving him a call as he said he will have more info soon.

Apart from those two and what you have mentioned, I haven't found anything that stands out.

[JimmyRickard]

Found this on eBay, is that what they are worth?

http://www.ebay.com.au/itm/Nissan-R33-Gtr-Rb26-PPG-5-Speed-Straight-Cut-Dog-Box-/321456969727?pt=AU_Car_Parts_Accessories&hash=item4ad85417ff&_uhb=1

I am not putting out astronomical power (under 300kw) so other than advantage of quicker shifts I am having trouble seeing the value in spending over $8k on my gearbox. Yet, I still want one

[Piggaz]

Lol.

Because it goes "clunk"?

[GTRPSI]

I found a PAR dogbox for sale on ebay that was going pretty cheap, but apparently PAR's boxes are shit.

I hear Quaife/Trust are pretty good, but parts are hard to source.

I contacted Quafie and they put me onto the people who they made the boxes for, all parts are still avaliable, they also told me each part internally has a part number stamped on it, you just contact them with the part number, so to make it clear everything is still avaliable for the boxes and they also made it clear that they will continue to support parts for them.

[NXTIME]

Quaife Engineering made the boxes for Trust Japan originally. And yes, they have plenty of stock for all major parts.

Piggaz, Holinger and the OS88?

[GTRPSI]

A copy of the email from the people who Quafie directed me for parts....i was chasing a bigger input shaft for ours for drag racing.

Hi Peter

I'm not sure I have much to tell you in a positive way, sorry !

We made that kit between 1992 and 2001, there were many changes made to it over the years, Here is a short answer to your questions ;

1. yes, we can still supply all the parts. The easiest way to quote, is to give me the part no. from the old item. Most of them start E3F1 and then two or three more digits, Numbers are stamped onto nearly everything apart from small parts and bearings

2. Bear in mind this kit fits into the stock casing This means gears are stock diameter. It also means ultimate power handling is restricted Probably to about 750 hp at the flywheel. We have a much newer much stronger sequential 6 speed far more capable of power in the 1000hp area. In my opinion, unless you have less than 750hp and dont mind a potential waiting time for spare parts then you are wasting your time with this kit. It was made so as to achieve 300kmph in time trials in Japan, not as a drag race or high strength kit. Anybody claiming to handle more than that power through stock diameter gears is talking BS. There is at least one manufacturer out your way claiming that !!

Hope I can help you further

kind regards

Website...

http://www.specialvehicle.co.uk/

Though i might share some info from the horses mouth about the 6 speed H pattern Quaife/Trust Dog boxes.

[Piggaz]

Piggaz, Holinger and the OS88?

??? Lol.

[JimmyRickard]

Part of the reason I am looking at a dogbox is they are supposedly 'stronger' than a regular gearbox as they can take more power etc. but the more I hear about them the more temperamental they sound and it seems like the running costs don't get any less after the initial outlay.

After buying a dogbox, what sort of dollars are required to maintain it once it's in? Does it matter that I'm not running a lot of power?

I have used a ppg dogbox in a commodore cup around Wakefield and it was awesome, so I know the benefits when driving with one. It's just for $8k I could buy 8-9 regular gearboxes