Just interested in what people think about this type of modification...especially for a price of $5999.00 USD. For those of you who don't know how it works here's a summary and after that I'm just interested in what people think. Basically when your on the line you have your car in first with the clutch but after you take off all you do is keep your foot pressed to the floor and shift as if there was no clutch. Personally I think if you need it then you midst well be driving an automatic and for the price its cheaper to buy an automatic as well.

http://www.quaifeamerica.com/gears/rx7.htm

 

How can you compare a dog box to an auto? That's silly.

 

That is silly to compare an auto to a dog box. A dog box is all race. Would it be worth it? If you had tons of power and just used the car to race with it would be. If you daily drive it then not a chance in hell.

 

Yea,a dogbox is not a solution for people that cant drive stick!
Its made for race,when you cannot afford to waste time/power clutching when you shift.

If you can afford to put one on a streetcar,well then more power to you.But its REALLY not something that 99% of us, need.

 

arent those tranys made with no syncros? i saw a skyline video had a dog boy trany grinding gears left and right, man may not of known how to drive it properly and rev match and what not

 

He probably had a hanging clutch or a bad pilot bearings or hydraulic issues....

They do have syncros,just very coarse.
Its basically a bike tranny,where the ratios are close and the amount of RPM correction between the gears is minimal.The dogs work like syncros in that they mesh their "pegs and slots" when a gear is selected.Since the ratios tend to be close on a race tranny,the coarse pegs and slots can pop together easily,positively engaging the next gear without the need for clutching or even letting off the gas,in some cases.
If you ride a motorcycle,you should know exactly what Im talking about.

 

Dog boxes are a crazy item to get, and I agree more or less with every one else above me. Only I would say, get it if you need it and this is going to be your track/weekend/1 day a week car. Don't plan on it if you need this to be reliable transportation. You can do it, but it would probably make life miserable.

 

I realize that there is no comparison...I was using that comparison lightly...I wanted to know more or less what people thought about spend 6k...and you^^ you don't have enough posts to know anything other than agreeing with people to up your thread count...lol

 

Thats not fair.
I only started posting here a year or two ago,but I had almost 10 years of posts over at Mazspeed prior to that.
Post numbers dont always determine knowledge,experience or tenure.......just an observation.

 

I am not sure who you are talking to with a low post count. I didn't really start posting a lot until about seven months ago. I just tried to absorb as much information as possible before I started giving advice on topics. And if you are talking about DriftFB, 393 (when I post this) posts is quite a bit. Well enough to know enough to post.

He has also been around longer than I have, which would give him more time to absorb information.

Edit: For the record, six grand for a racing transmission is a pretty good deal if you think about it. I've seen people drop that much for a turbo kit, engine rebuilds, and some people in suspenion mods. Granted that is expensive no matter how you look at it, its something that is guaranteed to make shifts fast as possible. I say for a purpose built racecar, its the transmission to have. I would never use it for anything but straight race though.

 

You are correct, "dog" gearboxes have no synchro rings/clutches. The word dog box is really a misnomer though as both synchro and synchroless gearboxes have dog gears.

On a synchroless gearbox the dog gears are far more coarse. This means you *dont* have to rev match exactly as when the dog teeth mesh it forces the engine to match the speed of the next gear. That is why gear changes on a dog box are quicker then a synchro box as there is no rev matching. Of course, the closer the ratios are the better it works. The harder you shift with dog boxes the better they work as well.

 

http://videos.streetfire.net/search/...3c00c10d69.htm

thats the skyline i was refering to, at first i thought it was a bad tranny. read the comments, it's a dog box made by HKS i guess, all i know is if my car sounded like this as a D/D id be too embarised to drive it

 

What a week I am having... jeez

I see the "lol" on the end, but I am assuming that is to try to get other people to laugh at me, with you. Because I don't speak alot on the internet I am not knowledgable? If you figure the ammount of time I've been a member compared to how many posts I have you would see that I don't post as much as many people.

As for me not doing anything but agreeing with people because I don't know anything. Did I just rehash what ever one else said? No, I expanded upon what they said with my opinion, which if I'm correct is what the Rxclub is for. Also, I recently had a miniature write up in a guys thread where I used pictures and knowledge I gained with my two hands to help him out.

So thank you for mr. high and might 1000 posts for pointing out how lowly and pathetic us 400 post people are.

jackass.

EDIT: Thank you normality glitch, its nice to know I'm not a nuisance to everyone.

 

You still need to lift, and using the clutch is still a good idea if you want decent drivetrain life. The benefit is there are no synchronizers to block the shift.

I'm too po' for even that stuff, so I have a shift lever that extends almost to steering column height and I reef on it when I absolutely, positively need it to be in the next gear. This destroys the synchros in no time, which is fine since the trans will actually shift faster with no synchros if you don't mind graunchy noises, and if you rev match your shifts (clutchless) the rest of the time, the lever falls into the next gear like butter.

True no lift shift transmissions cost a hell of a lot more than $6k, and they are not something you can use on the street, since letting off the throttle bangs them into neutral.

 

Guru in Aussieland sells a dogbox gearset the slips into the TII tranny case, it's around 6k too, iirc. These are pretty much a drag strip use only tranny and if you can't rev match, downshifting will tear them up.

The only benefit of a dog box is it can be shifted faster than a stock tranny, but still not as fast as a built auto. They are also very noisy since the gears are square cut instead of angled. The advantage is you don't have to go through all the bs of finding, building and mating a non-oem auto tranny to the rotary.

I don't know much about them, but my post count is the 2nd highest so far. lol