ForceFed

Hey just to let everyone know, i placed a price inquiry and availability with Jason@JT-Imports for the Trust/GREX 6 speed gear set. This gearset replaces the factory 5 speed gear set in the FD3S and comes with the gears, shift lever and shift ****, among all the associated bits to install it. Obviously you use the stock FD rear end, although you can change the final drive ratio by purchasing a different FDR.

Anyways, Jason quoted me ~6995.00 for the set NEW. This was for shipping to Charlotte, NC so freight may change depending on where you live. I thought this was a good price and wanted to share with the FD community.

Darril

es

So are you buying it?

moehler

iTrader: (12)

what are the benifits of a 6 speed trans?

Jason93RX7R1

Having more gears will allow you to better stay in your powerband.

ForceFed

Yes i intend to purchase this gear set. The most logical time for this would be in the winter time, when the car is put up. Why, are YOU going to buy it?

ForceFed

Bingo. However i'm very curious as to how much power this Trust/GREX gearset can hold. I'm wondering what the breaking point is. Eventually i plan to GT35/40 or T88 my CYM and hopefully this gearset can withstand the power.

es

No, I'd get the 4.30 diff set before I went into the gearbox, but my gearbox seems to be holding up pretty well. I've got the GT 3540, & haven't yet had a problem with too narrow a power band to warrent altered gear ratios.

If you went the T88 route I could see how a 6 speed box would be nice. For the GT3540 I don't really think it's needed.

But everybody's got an opinion, & I have yet to talk to anyone with the 6 speed gearbox so let me know what you think.

20B Junkie

I think I saw that the GReddy gearset can hold 1000PS somewhere, not sure though. But then again, aren't transmissions rated by torque, not HP?

Scrub

iTrader: (25)

that grex gear set is nuts. I think in 6th gear it tops out at like 340 Km/hr. Or something along those lines. I was looking at it a while ago, just can't remember the numbers.

ForceFed

es,
The 5 speed box seems to be just fine for the GT3540, T78, TXX or whatever. The reason why i wanted the 6 speed is that i feel it will improve both the acceleration of a single turbo car and keep it in the meat of it's powerband a bit better versus the 5 speed box, most notable the drop in RPMs when you shift into 5th gear.
When i'm finished modding my FD, i'd like it to be both a good quartermiler and also hold it's own on the highway against some of the midly modified Supras, and i think the 6speed may be the ticket with a properly matched turbo. I think with different rear end combo's and the extra cog on the 6speed gear set, it would be much easier to fine tune the kind of ratios you want. Of course i am no transmission specialist (and this is pure speculation at this point) but from a logical standpoint it just makes perfect sense to me Ultimately a T88 or a GT70 with a 6 speed gearbox sounds like a neat combo to me. Thoughts anyone?

Darril

Rhode_Dog

its a dog box isn't it?

Louis M

I may be off, but I think six speed is pretty pointless... an example of this is the STI vs. the EVO, (although i hate to say this: go mitsu.) the STI is actually faster than the EVO but 0-60 for the EVO is 4.9 while the STI is 5.0. Why? Because you have to shift into 3rd w/ the STI. In the same way, a six speed means simply shifting more, slowing you down... Correct me if I'm wrong, but I think its pretty pointless... the only thing that I think would be cool is keep pretty simular gear ratios for 1-4, have 5 be a top speed and 6 be a cruising...

es

Good point Luis M, I'd like to add that with the greater torque multiplication traction becomed even more of an issue. Witha 4.30 and the 6 speed box you have two things working against you in 1st gear.

I don't want to discourage you Forcefed, & I understand your points. Honestly I'd love to read a first hand review on this gearset.

Scrub

iTrader: (25)

Actually I would have to disagree with you. Seeing that the tests on the cars were preformed most likely by different drivers I think their is a possibility that maybe one isn't as good as the other at shifting.

particleeffect

the 6 speed on the sti is great, but real close. even know the sti makes alot of power, more gears seem to be better for lower power/tq cars. on a 400hp fd unless it was a seq dogbox i wouldn't bother. maybe if you are a hardcore track guy but it's just too much imo.

now a seq dogbox... mmm

ForceFed

Some good points, but remember that the STi has a completely different final drive ratio. Also, the car was meant for very diverse terrain and Subaru kept that in mind when designing the 6 speed box for the STi, meaning it has much lower gears for 1-3.

As far as acceleration goes, you make another good point about shifting into another gear for your acceleration tests, however consider this: The relationship between the time it takes to change a gear to gear ratio aquired by the 6 speed box might offset or better yet, decrease your accleration time. In other words, even though you may have one more gear to grab the torque and hp multiplied by that extra gear may completely cancel out the shift with it's increased accleration. Again, this is all speculation on my part as i'm no tranny expert and i fully intend to purchase this gear set this winter when the car is put away for the winter. For me the gearbox just makes sense to fill in that wicked void between 4th and 5th gear.

Good thoughts being kicked around in this thread though, keep them coming please.

Shinobi-X

5th gear is the only real 'problem', as it's a taller gear. Depending on if you will be drag racing the car (and how much power you have), I would personally just replace 5th, and save the money on the swap. While it is interesting (and something I would consider if I had the money), I honestly wouldn't be using 5th (or 6th) for much more than cruising anyway (unless I'm looking to break the law )- a 6spd swap would sort of defeat the purpose from a practical point of view. If you have the funds though ForceFed, then go for it, as it would be interesting to see and get some impressions.

ForceFed

It'd be the only CYM with 42Kmi original and a 6 speed tranny

Louis M

or search for 6-Speed FD and take Resource up on his deal for like 2K a T51...

bitton

i don't want to get in the middle of discussion or anythig but i know that Quaif makes a 6 spd conversion for the j-spec tranny and it's alot cheaper

jspecracer7

And I think it's a dogmission as well

...for that price...I wouldn't get the 6 speed unless it's a dogmission

jantore

if u realy wanna spend alot of money u can get the Re-Amemiya 7 speed racing tranny. The price in japan is about 28000 USD.

It's a sequential gear box. yumy

Chronos

I'm going to make a guess that the gearbox you're referring to is definately a synchro type. HKS also makes one and it's synchro as well. You DO NOT want a dogmission tranny in ANY kind of a street driven car, it would be insanely hard to shift (count on double clutching every shift) and extremely loud (think how the car sounds going really fast in reverse, think about that at 120mph!). I would definately LOVE to get a synchro type 6speed tranny for road racing and autocross (and maybe highspeed highway runs ), but the price of $8000 is a bit excessive for me considering the gains. Who knows though, it might be that final mod after I'm done dropping $30,000 on other **** before that!

By the way...A guy here in San Diego has a completely raced out 2250lb FD with a 4 SPEED clutchless dog tranny! he shifts into second at about 70mph and 8600rpm on his 20B The car is the meanest god damn rotary you've ever heard...it should be for the amount of money he's put into it!

Also, here's a pic of the HKS unit:

shawnk

How do they keep the fluid in there with that big hole in the side. I mean really it looks nice but the cost of redline would kill you....

j/j

But seriously...if you are looking to go faster then there are alot of other things you can spend 7k/28k on. I dont think I would drop that much money on something that this many people debate about. Unless of course you are financially set then go ahead get whatever your heart desires - unfortunately I am not.

Shawn

MikeC

I remember reading about a guy racing one of the original rx7s here in Australia. He bought the car off one of the teams with a 5 speed in it. As the car had all the mods that he could legally apply the best go-fast option was a 6 speed box. So he asked the team how much it would cost and they said a grand per gear. When he came back with 6 grand they said "its got reverse". So he came back again with 7 grand. The end result was something like a 2 second quicker lap time. Over 40 laps that's 1 minute 20 seconds, which is a BIG difference.

Although I do agree with what everyone has said that for the road it's probably not worth it but it can make a difference.