Mazderati

iTrader: (3)

Interesting. I didn't realize that there was a 6spd. offered overseas in the RX-7. They also state that trimming of the cases is required so, who knows, maybe you can use it in the 5spd. housing.

For the amount of money that is going to be spent and considering the power output you are expecting, I don't know if I wouldn't think twice about using the stock cases. I could forsee the stock cases, under extreme situations, which this is one example, flexing and throwing things out of synch and alignment. I guess if you were really wanting to use one of the kits that uses the stock case, however, you could have it cryo-treated.

I, personally, would look long and hard at what Jerico offers. Reputation, quality, almost 900 gear ratios to choose from and a magnesium case right around 80lbs. in total.

http://www.jericoperformance.com/products/rr5spd.html

Good luck with whatever you choose.

Kyle

RX-Heven

iTrader: (1)

It's not that I don't want to put effort into it, I just don't want to think about it too much and screw up right befoe the turn in point. I've got plenty of time behind the wheel of Star Mazdas. Matching revs is second nature. They all use dog-rings w/ straight cut gears. Yeah you have to blip the throttle, but the (short) shift is done in milleseconds, so the blip is minimal and the throw/effort is nothing.Plus I have driven a Jerico 4-speed. They were all effortless to downshift in. Much easier than any syncro tranny, which I always heel-toe with, even in my daily drivers. To me that takes more effort.

TYSON

Exactly Imagine the great after sales service you would get from them when they can't / won't help you with an intercooler.

10sec rx7

My thoughts exactly, if your going to spend the big $$$$ go with a name brand box like jerico or G force, they will have better aftersales serivce and from what i have seen of there boxes they are strong as hell!

Dale

RX-Heven

iTrader: (1)

I just talked to another guy at GReddy, and he at least knew of the tranny. Made by their parent company, Trust. No swapping rear ratios, you are stuck with what it came with. $8000 msrp. Available for fd only. Specifically, I said specifically for drag racing. Is streetable but very difficult to downshift with. Not unlike the HKS from what I've heard.
Beside, that plexiglass transmission case doesn't look to strong.

TYSON

I dunno about the Greddy. You can see it has spur gears, so it will definitely be louder than the HKS. HKS Tranny Greddy Tranny I've never driven or ridden in the car with the HKS, maybe I can get someone who has to comment for you. These should be drop in, do the American trannies drop right in?

Evil Aviator

G-Force has a 5-speed H-shifter transmission that you could probably use. If you plan on racing in a certain class, check the rules before you drop several grand on a transmissison. Some racing classes don't allow sequential shifting, air shifting, automatic shifting, or other various gizmos.

BTW, I agree with you on the HKS and GReddy transmissions. While they have excellent names in the "rice" community, the facts are that nobody seems to use them in the US, the dealerships don't have any info, and even if you did find one you would have no technical support. I think these transmissions are best left chrome-plated on Japanese show cars that only rack up road miles when they are in the back of a trailer.

Node

iTrader: (1)

Evil A: soul assassins car was a chrome plated show car? hmmm

Evil Aviator

Didn't he unload that transmission ASAP when he got back to the US? hmmm?

Young jarhead to be, you too may learn the ways of the world once you travel outside the US. Some things are best left overseas.

Node

iTrader: (1)

Because he couldn't register it for street legal use. Hence no need to downshift.
But there may have been other reasons.
But I think the main one was its a $5k tranny and he needed the money to ship his car over, which still didn't happen

Evil Aviator

That's too bad, I didn't hear about that last part. Anyway, I don't see why anybody would want a transmission that has to get shipped to Japan for repairs. That would ruin several months of your racing season unless you had a $pare. For the same price or less you can get a race-proven Jerico that has parts and services avaliable in the US.

For some reason I thought the HKS Dogmission was a road race dog-gear transmission, so I don't understand why it wouldn't downshift. Which transmission does this part go to?
http://www.racecarnewmedia.com/hks/news200101g.htm

vosko

iTrader: (4)

well i'm gonna see how long a rebuilt trans lasts in my car by judge ito. i am trying to get a group buy going on gforce billet input and output shafts. those will go on my spare tranny

Node

iTrader: (1)

I have no idea what this downshift nonsense is?
It's an H gate straight cut tranny. I don't see why it won't downshift just as good as the next straight cut geared tranny.
Maybe he just mentions that because you have to actually put a tiny bit of thought into downshifting since it has no synchros.
But since soul doesn't do the RX-7 Forum thing anymore we'll never know.

TYSON

Maybe he doesn't care to comment because people who know are sick of seeing what people who don't know have to say.

As Node said, dog gears don't engage as gently as synchros. The HKS does downshift, you have to do a little rev matching and engage firmly and quickly. How could this be any different from others, unless they do the rev matching for you?

Node

iTrader: (1)

Yeah, only way I can see it easier to downshift with a straight cut tranny is if its fully sequential (rally style)
And some don't even downshift, they just reset to 1st.

RX-Heven

iTrader: (1)

I'm only repeating what HKS and Soul Assasin told me about it. Who knows if the guys at HKS that told me this know what they are talking about. Plus I do not know if Soul had anything to compare it to.
Some transmissions are worse than others, even from one to another of the same type. We have a fleet of 40 cars (give or take 5-10 from crash damage) with dog-ring trannies and some shift crappy while others are likre warm butter. This is largely due to how much attention was paid to clearances when building them.
To me, downshifting into a turn with a dog-ring tranny is practically effortless as compared to a synchro trannie (short and fast vs. long and slow). Thats the way they are supposed to be. So when someone who has experience with one and people who are supposed to know what they are talking about tell me otherwise, I'm inclined to listen. Do you think that they would actually race a transmission that was difficult to downshift and threshold brake at the same time?
Have you ever driven a dog-ring tranny?

RX-Heven

iTrader: (1)

Like I said earlier, several times, those were his comments.
Thanks for the advice. I'll remember that as I'm driving around the track this weekend. Unless your pussyfooting around, I think they shift smoother and easier at speed.
Are you speaking from experience?

I could downshift in an old GM Turbo 400, doesn't mean I want to drive it on a road course.

TYSON

You're right I haven't driven the HKS. I'm speaking from asking the driver while standing under the car on the hoist. Have you even seen the HKS before I showed you the pictures?

Chill out buddy. You said yourself that different trannies of the same model shift differently. If it's out of your budget why ask about it so much? I wouldn't buy one unless I had the money to burn and had the power to use it. (hey, I do have the power to use it.)As Evil said, service is an issue.

You know how to drive a dog transmission, and now you know it can be driven No problems

RX-Heven

iTrader: (1)

Sure haven't and considering HKS-USA told me they've only sold one of these in the states, I doubt I ever will.

TYSON

Whoops I was editing while you responded.

RX-Heven

iTrader: (1)

touche'

rx7tt95

I did a similar search for a useable box some time back. Take a peek at Hewland. They have a box in the $6K range, dog, h-pattern, used in Corvettes for the Grand Am series I believe. Handles somewhere in the 600ft./lbs. range. GForce also has a road race box.
Michel

racedriver

I have a roadrace fd rx7 and had the tranny modified for roadracing. It now uses Jerico straight cut gears in these ratios, 2.0,1.6, 1.3, 1.1, .9.

Housemanautosport.com i believe.

It has syncros, very short throws, and is bulletproof. I highly recommend it to anyone. And about $4000 makes it cheaper than hks, greddy.

lane_change

iTrader: (20)

How will it do for drag racing? You say bulletproof, is it?

Anthony Rodrigues

I have owned and used Jerico and Libertys and am currently doing the testing for Guru. Purpose built drag race applications could not compare with air shifted Liberty, however this is a street /race box with quality that the other manufacturers could only dream about. Did you know that the boxes are manufactured in the same plant as 90% world rally g/box's, touring car and many pro road race catagories. Also a gear taper, tip relief design and contact patch designed for F1 work in their favour. They even make my liberty gearset look quiet ordinary. As for customer service, I purchased one of the new Jerico 4 speed clutchless boxes several years ago and after 3 rebuilds never completed a pass. When I tried to come to some type of agreement with Jerico they laughed at me. After using the Guru box I can only say that my first impressions are awesome and the shift is the most direct I have felt. Try shifting a syncro box at 12,000rpm and tell me that they are suitable, Guru boxes are able to, I have driven them myself. I will try to keep you posted on the results.
Regards-Anthony