Streetable H-Pattern Dog Box Options?
 

I'm wondering if anyone knows any other options for streetable H-pattern dog box's? I found this company and inquired if they could make one for the FD box or how much their T-56 option is. Anyone know any other companies that make streetable versions? This video of the Pfitzner Performance Gearbox just looks awesome.


thewird

PPG can custom built anything u want.. im sure they can build same type of gearbox for the fd.

We'll see what they say. I did ask them about the stock gearbox option.

thewird

This guy will make a bell housing to fit t56 to 13b/20b, for a decent price i think. Someone on this forum got a bell housing from him to use a fc tranny and bolt to a subaru engine thats in the FC.
Bill's Auto Fabrication - Toledo, Ohio

No dogbox is really streetable due to the extremely rapid wear of the dog rings instead of the syncro rings. They are two spinning cogs on gears that basically smash into each other. With my jerico after a few hours of racing there is a lot of debris in the oil necessitating a flush. And i shift very precisely, rev match, and use the clutch.
You are way better off with a syncro transmission.

From what I've been reading you can get a good ~3-4 years out of the dogboxes before a rebuild is required. That is good in my books for intended use.

thewird

Besides being expensive, wearing out faster and being harder to drive, they're also really, really loud since they usually have straight cut gears.

3-4 years of use before requiring a rebuild isn't what I would call streetable, even if it can physically be driven on the street. I mean, anything with a working reverse gear is technically streetable by that standard...

If you're going to spend that kind of cash on a transmission, why not just get a six-speed sequential?

I know some gt3 scca racers that take the dog boxes apart every 3 races and replace something.

Marco, my Quaife dog box in the Cougar lasted 4 years of race use (about 25 races) before starting to jump out of gear. It then required a bunch of new pieces at an average of $300 a piece. Cost me well over $2500 and my rebuild was minor. The way you need to shift a dogbox is different than how you use a synchro box. They aren't called bang shifts for nothing.

You should also consider where you are buying the box from and if they will still be around in 3 years when you need pieces. My Quaife box is 8 years old and they didn't have all the pieces I needed in inventory anymore, so I needed to have a few of the pieces refaced just so I could get the car running again until Quaife could run some more.

I would stay with the big guys like Hottinger, Jericho, G-Force and Quaife just to make sure you can get spares.

Eric

From your sig I gather you know what you are doing as far as using dog engagement off the track...here's a link:
PAR
I know of one fd using their synchromesh gears successfully. I did try to buy a set of dog gears off them, but communication was slow and fabrication was weeks away and I was without a tranny. Gerard was my contact.

If your plan is to ONLY drive the car to, from, and on the track, then I'd say a dog box is doable. If this is a track toy + weekend cruiser or DD you plan to put real miles on, then I'd recommend against a dog box.

Sure they're fun at the track and they shift lightning fast, but the first time you miss a shift- BANG! you've just stripped the dogs off a gear and you have to rebuild the tranny. Some trans have dogs that are separate from the gears and you can replace them. Others have the dogs machined onto the side of the gear, and you have to replace the entire gear assembly to get it back up and running.
Really not a "streetable" option, IMO.

Track-only car? sure. when you find one, see if they have two since I'm in the market for a good deal too. :)

We use and sell a dogbox gear set for fc and fd boxes. They are made by Modena engineering in Australia. They are well built and strong but the casing is it's limitation. I wouldn't use one in a street car as they hard to use in at low loads and rpms. I've got incar footage of the box in use in our race car.
Cheers



They are still making spare parts for these boxes and will be as people are using these boxes in Australia alot.

What type of gearing options are available and what torque are the gears rated for?

thewird

PPG stuff is top notch, but pricey. I wouldnt be surprised at all if they get back to you with a quote of $10k+. They actually used to market a gearset for the FD, but to my knowledge dont anymore. G-force would most likely be your cheapest option (thats the way I went) as even including a bellhousing adapter , clutch and driveshaft you can probably do it for a bit over $4k. If you are going T5 the only real issue is shifter placement is a few inches further forward than the FD trans, so youd need to figure something out there.

That's my experience with synchronized transmissions after a few minutes of competition time, which is why I just replace them three or four times per year. Can't flush the fluid out soon enough to prevent the damage from being done.

We bolted a strong magnet in the bottom of the box to collect the fine metal fillings it works well in our dogbox. We replace the oil once a year and do a check on the dogrings and gears. The Modena box is $9500(aus) with
shifter. They have two gear sets one is circuit 1:1 top and the other has an overdrive. I'll get the full ratio numbers to you soon.



Sorry didn't realize that the last video did show the shifting to well. Also the first corner shift problem was driver error ( trying to shift into the wrong gear ).

Sorry for the very old thread bump, I joined the forum as I have one of these hks transmissions on my S14 and unfortunately broke 2 gears, I am wondering if anyone has one of these for parts?

thank you

HKS doesn’t make transmissions any more but you might be able to get parts…

you’re probably going to have to get something fabricated, though…

not through them, here’s the answer, or it used to be, think they still do though…:

https://www.rx7club.com/race-car-tec.../#post12580764
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