Rotary Car Performance General Rotary Car and Engine modification discussions.

Fantastic Dogbox for RX7

Old 02-11-02, 12:55 AM
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Originally posted by DELTA_Rotary


Nice... hmm 5000 + shipping from down under. That has GOT to put a dent in someones platinum card.
I have been thinking about this ? on price and had a search on the net, when I compare it with the price from competitors $5k is a fair bit less than the competition. I also had a think about other money I had spent on my car, and can honestly say the 5k for the transmission was the best 5k I have ever spent on performance enhancing modifications.

Re shipping, I would say it would not be that much these days and I have heard they are going to be selling them via a distributor in the US maybe. When I have shipped stuff from OZ in the past it can cost as low as $7 per kilo and be delivered within 72 hrs, therefore a gearset is about 15kg, not much!
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Old 02-11-02, 04:14 AM
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Originally posted by twister
It is just like a 'syncro' box, just with straight cut gears so you can change gears without using the clutch! You still change gears the same i.e. once you have reached your maximum rev range in each gear. The correct way to use it is to be decisive with it, not ***** around with the gear changes. The gear changes are much much quicker and smoother, it prevents the revs from dropping off.

They are much stronger than any standard and most pro boxes. Just what you need for circuit and street drag sort of cars!

hey so i can change the gears at any revs....

u said thts its like the V8's series box and i saw they use the cluch when down shifting.... whts with tht....

ps do u distribute to nz?
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Old 02-11-02, 04:59 AM
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Well you can change at any revs but it is not magic, i.e. you have to be going fast enough to change up otherwise the engine will just drop off the revs etc.

With the V8's (and with this) you can use the clutch to change down, in someways it is easier to match the revs by using the clutch and heal-toe etc.

And yes of course GURU Motorsports will sell into NZ, that is not far from Melbourne where they are based! Also with the V8's rememebr thay want nothing to break for the entire day (1000k's at Bathurst is prettty tough) so they try and be real careful with the entire car so it depends who is driving it how they drive. Some drivers are easy on cars and others not!
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Old 02-11-02, 05:40 AM
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Originally posted by Gene
to hear a good impression of straight cut gears, just drive in reverse. whirrrrrrrrr. Or play some gran turismo 3 and put a racing tranny in the car. whirrrrrrrrr
ive actually heard something about reverse gears are dog gears and no synchros. is this true? and that might be why it sounds like that.
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Old 02-11-02, 12:07 PM
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Well yeah there are no syncros on your reverse gear, because you don't engage reverse when you're moving I'm pretty sure it's just a plain spline engagement though
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Old 02-11-02, 05:14 PM
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Originally posted by Gene
Well yeah there are no syncros on your reverse gear, because you don't engage reverse when you're moving I'm pretty sure it's just a plain spline engagement though
i heard tht the sreies V actually has a synchro for som od reason... but i thnk im wrong... maybe it was the firs gear
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Old 02-11-02, 05:17 PM
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hey twisty then let me rephrase the question what is the optimal rpm for shifing up and shhifting down....
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Old 02-12-02, 08:04 PM
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any time now
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Old 02-13-02, 01:06 AM
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menace... depends on the car my '85 stockport 12A best shifting is upshift at 6k because it only makes noise, not power, above that, likewise downshift when revs drop below 4k... my '80 street port = upshift at 7600-7800 (8k with open headers) and downshift below 5500 or so depending on gear (open exhaust is dragstrip only = no downshifting) coming out of a tight corner it was better to leave it in 3rd and bog a little instead of trying to pull away in 2nd - rips up the tires too easily in 2nd and it sucks to have to upshift right away out of a turn.

Reverse gear (at least on the 12A trannies I've had apart) is a straightcut gear with no synchro. They're not dog-ring style, though, it's just like a synchro type with the splines except there's no synchro in between the slider and the gear. That's why it grinds if you try to shfit into reverse from a stop unless you momentarily shift into a forward gear to get the tranny internals to stop spinning. (Incidentally a lot of trannys have a crashbox setup for reverse... instead of sliding a slider over teeth on the side of the gear, it actually physically moves the gear in and out of contact with the reverse idler gear. Pretty neat!)

Last edited by peejay; 02-13-02 at 01:11 AM.
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Old 02-14-02, 02:39 AM
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I would like more info on this gear box too, if you could email me at [email protected]

thanks KIMO
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Old 02-14-02, 03:43 AM
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Have you looked at the site www.gurumotorsports.com ?

Plenty of good information can be found at this site.

Guru Motorsports
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Old 02-14-02, 08:36 AM
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so when you are sitting in the driver seat do you see one shifter or do you see 6 of them? also is it sort of like shifter the stock tranny without using the clutch?
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Old 02-14-02, 10:56 PM
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Twister, Do you know about Select Mazda gear boxes? They offer a similar setup for $4200 AU which works out to $2200 US. They claim the boxes can take 500+ HP.
Here is the link:
http://www.selectmaz.com.au/main_frame.htm
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Old 02-15-02, 02:57 AM
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Hi,

Yes I do! Lets say they also run Guru products within their race car!

I am unware of any racers in Australia who use that product, I do not think any have been sold for a long time to 'racers', it is basically an upgraded 'standard' Turbo box not a complete racing gearset! They used to be state of the art, but have been out of it for a little while.

? to ask include the following
Warranty, parts, relability, hp strength! , availability, quality, strength, ratios!

Have a look at the shifter etc, the Guru products are for FC & FD the box they sell is appropriate for FC only.

The quality (as can be seen by the photos) of the Guru products is better than almost (if not all) pro boxes. I do not want to say to many things about some of Guru's competition but you pay for what you get! We really are talking chalk and cheese. What is important is what is inside i.e. the gearset, or do you just want a 'cheap' box!
Drag, race or street GURU is the way to go.

Guru Motorsports

Last edited by twister; 02-15-02 at 03:54 AM.
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Old 02-15-02, 03:28 AM
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ha, so is that $5000USD? And are there any cheaper doggears? I mean, not to say cheap isn't pretty bad, but $5k is a hell of a lot of money.
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Old 02-15-02, 03:56 AM
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Originally posted by Node
ha, so is that $5000USD? And are there any cheaper doggears? I mean, not to say cheap isn't pretty bad, but $5k is a hell of a lot of money.
**** the HKS dogmission is like 6 g's....
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Old 02-15-02, 03:56 AM
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Originally posted by Node
ha, so is that $5000USD? And are there any cheaper doggears? I mean, not to say cheap isn't pretty bad, but $5k is a hell of a lot of money.
Yes 5k USD. Cheaper yes, more expensive yes much!!, any better , nup! I have tried several and will continue to rave about this one, that is why the V8 Supercars here in Australia use exactly the same from the same guy!
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Old 02-15-02, 04:00 AM
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Originally posted by Crusader_9x
so when you are sitting in the driver seat do you see one shifter or do you see 6 of them? also is it sort of like shifter the stock tranny without using the clutch?
Hi, just the one shifter! I do not think I could handle six!

Shifting between gears in a straight cut gearbox is not like shifting in a normal box. The shift is so smooth & faster!!!!!! So much it is unbelievable so you do not loose engine revs and if you want to win you will never go back again after trying one.
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Old 02-15-02, 04:07 AM
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So what are the cheaper ones, just curious, and this is pretty cheap considering the prices of racing trannies.
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Old 02-15-02, 06:47 AM
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FWIW it's not the straight cut gears that change the shiftability - the gears do not slide in and out of mesh, they stay in mesh at all times when you have a synchro or dogbox setup.

However straightcut gears are a lot stronger than angle-cut gears and they don't put any nasty side loads on the bearings! (Plus they sound sweet too!)

- PJ (My car has bad countershaft bearings, it only SOUNDS like straight cut gears )
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Old 02-15-02, 06:18 PM
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Twister,
Is $5k the price for the complete gearset or is it for a whole gearbox?
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Old 02-15-02, 07:39 PM
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Originally posted by moespeed
Twister,
Is $5k the price for the complete gearset or is it for a whole gearbox?
Hi, 5K is for the entire gearset and short shifter etc (have a look at their website, a great photo of the actual kit is shown on it). They distribute it this way to keep your tranport costs down. The only thing not included is the casing (ie. the outside case). They will supply a case if someone really wants it but the cost to ship around the world is fairly high.

www.gurumotorsports.com
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Old 02-15-02, 07:46 PM
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Originally posted by menace
hey twisty then let me rephrase the question what is the optimal rpm for shifing up and shhifting down....
Sorry menace not to reply sooner.

As peejay said it depends upon your car, so it not just one answer. In my racecar I change gears at maximum torque about 9'200 revs but of course you can go higher when you need tooooo! But of course you can also change sooner if you have to, if you look at the guru site you will see the thickness of the gears and the quality of the dogs etc, this is why this box is so much stronger and better than any other for the RX7. the reason these guys built them was they could not get any other proboxes to last for a decent amount of time. It gets expensive to keep on replacing tranny's! So this is why the box is designed for such high performance and strength.
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Old 02-15-02, 09:45 PM
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Things are looking good for me to get the dogbox....getting everything else cleared up on my car and it'll be ready to drop in and go.

This might sound stupid.....but how does this tranny react on the dyno? Will it shift differently because of no load or is that a stupid question?

Twister....you've been really helpful with all our questions....thank-you. I'm glad that you posted this....because now this is one less area to have to always question whether it will last or not.
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Old 02-15-02, 09:55 PM
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the website seems to b down... WTF?
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