"9 second" Gearbox for RX-7?
07-20-02 | 10:38 PM
#1
Thread Starter
Full Member
Joined: Jul 2001
Posts: 81
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From: Australia
"9 second" Gearbox for RX-7?
I went to the strip last night for a test n tune. Concentrating on the launches resulted in the following 60 foot times:-
1.39
1.37
1.36
All on a 26x8.5" slick.
Unfortunately on my last pass I completely destroyed the existing gearbox (again). Currently I am using a Mazda RX-7 Series 5 gearbox, but after blowing a couple up I am looking at upgrading to something that can withstand the launches, the revs, and the power
Should be able to handle say 1.3 60', 9500rpm, and 650-700hp.
Suggestions so far include:-
Ford Toploader
Supra Turbo
Supra 6 speed Turbo
Tremec 5 speed
Jerico
Doug Nash
Richmond 5 speed
Anyone else got some suggestions/prices and also will it fit in my trans tunnel or will it require some serious massaging with the FBH?
Yes, I want a manual. Some streetability would be nice too.
1.39
1.37
1.36
All on a 26x8.5" slick.
Unfortunately on my last pass I completely destroyed the existing gearbox (again). Currently I am using a Mazda RX-7 Series 5 gearbox, but after blowing a couple up I am looking at upgrading to something that can withstand the launches, the revs, and the power
Should be able to handle say 1.3 60', 9500rpm, and 650-700hp.
Suggestions so far include:-
Ford Toploader
Supra Turbo
Supra 6 speed Turbo
Tremec 5 speed
Jerico
Doug Nash
Richmond 5 speed
Anyone else got some suggestions/prices and also will it fit in my trans tunnel or will it require some serious massaging with the FBH?
Yes, I want a manual. Some streetability would be nice too.
07-21-02 | 11:44 PM
#2
Senior Member
Joined: Jan 2002
Posts: 300
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From: Melbourne, Australia
07-22-02 | 04:14 AM
#3
Rotary Enthusiast
Joined: Mar 2001
Posts: 1,353
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From: Sydney, Australia
For the price of one of there boxes Angus could get a Jerico or a g-force street fighter,
and the Guru box uses the standard input and output shafts and thats what Angus twisted and broke
and the Guru box uses the standard input and output shafts and thats what Angus twisted and broke
07-22-02 | 06:18 PM
#4
Senior Member
Joined: Jan 2002
Posts: 300
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From: Melbourne, Australia
But he also commented he did not want to redesign his car around the box, that is one of the 'advantages' of the stock case.
By the way the Guru boxes DO NOT use the standard input or output shaft, every component is made new, Shafts are made from the highest grade billet steel avail on the market the same as used in the V8 Supercars here in OZ, so you will not be bending them to easy!, they are made to the standard spline fitment so you can bolt them straight in, so that is may be where you are getting confused? Talk with the guys, i.e. give Rohan a call since you are local if you want some details. Why do you think Nick Dunkley is doing so well in IP cars this year, as well as Rick Shaw & Selectmaz desperate to get them into their IP circuit cars? Or ask Anthony R from Maztech for his throughts from a 'drag' point of view.
By the way the Guru boxes DO NOT use the standard input or output shaft, every component is made new, Shafts are made from the highest grade billet steel avail on the market the same as used in the V8 Supercars here in OZ, so you will not be bending them to easy!, they are made to the standard spline fitment so you can bolt them straight in, so that is may be where you are getting confused? Talk with the guys, i.e. give Rohan a call since you are local if you want some details. Why do you think Nick Dunkley is doing so well in IP cars this year, as well as Rick Shaw & Selectmaz desperate to get them into their IP circuit cars? Or ask Anthony R from Maztech for his throughts from a 'drag' point of view.
Last edited by twister; 07-22-02 at 06:21 PM.
07-22-02 | 07:03 PM
#5
Rotary Enthusiast
Joined: Mar 2001
Posts: 1,353
Likes: 9
From: Sydney, Australia
Maybe good for cuircut but not yet proven with 700hp and 9000 drops, not many boxes can handle this, if anthony wants to prove me wrong go ahead i would loved to be proved wrong, but my way of thinking for au$9000 he could buy a proven street fighter box (has run 9.30 in a untubbed car) or a tremac (has run 9.0 in a untubbed car) and still have $4500 left over to spend else where.
BTW you dont have to redisign anything to fit these boxes in, simple adaptor plate the the mazda bell housing and a new starter and away you go. very simple change
BTW you dont have to redisign anything to fit these boxes in, simple adaptor plate the the mazda bell housing and a new starter and away you go. very simple change
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07-22-02 | 11:10 PM
#8
Senior Member
Joined: Jan 2002
Posts: 300
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From: Melbourne, Australia
Originally posted by 10sec rx7
Maybe good for cuircut but not yet proven with 700hp and 9000 drops, not many boxes can handle this, if anthony wants to prove me wrong go ahead i would loved to be proved wrong, but my way of thinking for au$9000 he could buy a proven street fighter box (has run 9.30 in a untubbed car) or a tremac (has run 9.0 in a untubbed car) and still have $4500 left over to spend else where.
BTW you dont have to redisign anything to fit these boxes in, simple adaptor plate the the mazda bell housing and a new starter and away you go. very simple change
Maybe good for cuircut but not yet proven with 700hp and 9000 drops, not many boxes can handle this, if anthony wants to prove me wrong go ahead i would loved to be proved wrong, but my way of thinking for au$9000 he could buy a proven street fighter box (has run 9.30 in a untubbed car) or a tremac (has run 9.0 in a untubbed car) and still have $4500 left over to spend else where.
BTW you dont have to redisign anything to fit these boxes in, simple adaptor plate the the mazda bell housing and a new starter and away you go. very simple change
07-22-02 | 11:24 PM
#9
Gaijin Racing
Joined: Feb 2001
Posts: 1,117
Likes: 0
From: Normal, IL
Originally posted by 10sec rx7
Its made by G-Force and is a super tough street/drag box, can be setup H shift, vertical gate etc, they are around the $5000au mark, and are a proven box
Its made by G-Force and is a super tough street/drag box, can be setup H shift, vertical gate etc, they are around the $5000au mark, and are a proven box
07-22-02 | 11:45 PM
#10
Rotary Enthusiast
Joined: Mar 2001
Posts: 1,353
Likes: 9
From: Sydney, Australia
Twister,
The Guru box is aimed at tough street and cuircut cars, where as Angus wants to drag with the occasional street, i dont doubt that guru could build a box for the drags but i dont know weather the current one would hold up, i would be very intrested to find out tho!
Kurgan,
I dont know alot about the street fighter apart from a car from the workshop that does all my work was using one and ran a 9.30 untubbed on his street fighter box, they said it was around the $5k mark, could have been second hand i dont know, only know what i was told, i know the tremacs are $4499 from delow in sydney but i would drive to tasmania to buy one than buy one off that *****.
The Guru box is aimed at tough street and cuircut cars, where as Angus wants to drag with the occasional street, i dont doubt that guru could build a box for the drags but i dont know weather the current one would hold up, i would be very intrested to find out tho!
Kurgan,
I dont know alot about the street fighter apart from a car from the workshop that does all my work was using one and ran a 9.30 untubbed on his street fighter box, they said it was around the $5k mark, could have been second hand i dont know, only know what i was told, i know the tremacs are $4499 from delow in sydney but i would drive to tasmania to buy one than buy one off that *****.
07-25-02 | 06:59 AM
#16
20B N/A Wide Body FC3S
Joined: Feb 2001
Posts: 797
Likes: 1
From: Okinawa Japan
I e-mail G-force and this was the e-mail they sent back to me..
Hello,
For your application I would recommend one of our GF-5R 5 speeds. They
are a dog ring transmission and you can drive them one the street,
albeit a bit noisy. They have straight-cut 9310 VAR gears and they are
rated anywhere from 900 to 1400 HP depending upon application (clutch,
tire, suspension, RPM, etc.) One of those should work fine in your
car. You will, however, need to change the splines on your clutch
disks. We offer a 26 spline GM, which is what most of our rotary
customers use. Some use the 18 spline Chrysler, but most use the 26
spline GM. The factory Mazda splines won't hold up with a dog ring
trans because of the added shock, especially with the power that your
making. The output spline is a 32 spline Turbo 400, which, there again,
is bigger to help cope with the added power and abuse in general. You
can buy a factory Dana/Spicer yoke for about $60. Keep in mind that
these transmissions are 1:1 in 5th gear (just like your 4th gear), so if
you drive a lot on the street you will definitely use more gas via
turning the engine higher. I would take out the stock 4:10 rear and go
with a 3.73 to help this situation. I know they make them because I'm
looking into one for my car (I have a 93' RX-7). The price on a GF-5R
with an H-pattern shifter would be $5,300 and the necessary adapter (to
use the stock starter and bellhousing) is an additional $450. These
prices are less shipping/handling/insurance (usually a flat rate of
$150). We can have one together in about 2 weeks if you would elect to
purchase one. Based on your vehicle information I would recommend a
3.66, 2.500, 1.73, 1.30, 1.00 with a 3.73 rear and a 3.50, 2.39, 1.72,
1.29, 1.00 with a 4.10 rear. Just for you information, the engine RPM
at 65mph would be, based on your tire size, 3490 with a 4.10 and 3170
with a 3.73. If your car run 120mph in the quarter, you would go
through at 6440 with a 4.10 and 5850 with a 3.73. Just thought you'd
like the info. If you have any other questions, please feel free to
call us at 717-867-4352 between 8am and 4pm, est., M-For just email us
again. Thanks,
Michael Long
V.P. G-Force Transmissions/Long Shifters
For your application I would recommend one of our GF-5R 5 speeds. They
are a dog ring transmission and you can drive them one the street,
albeit a bit noisy. They have straight-cut 9310 VAR gears and they are
rated anywhere from 900 to 1400 HP depending upon application (clutch,
tire, suspension, RPM, etc.) One of those should work fine in your
car. You will, however, need to change the splines on your clutch
disks. We offer a 26 spline GM, which is what most of our rotary
customers use. Some use the 18 spline Chrysler, but most use the 26
spline GM. The factory Mazda splines won't hold up with a dog ring
trans because of the added shock, especially with the power that your
making. The output spline is a 32 spline Turbo 400, which, there again,
is bigger to help cope with the added power and abuse in general. You
can buy a factory Dana/Spicer yoke for about $60. Keep in mind that
these transmissions are 1:1 in 5th gear (just like your 4th gear), so if
you drive a lot on the street you will definitely use more gas via
turning the engine higher. I would take out the stock 4:10 rear and go
with a 3.73 to help this situation. I know they make them because I'm
looking into one for my car (I have a 93' RX-7). The price on a GF-5R
with an H-pattern shifter would be $5,300 and the necessary adapter (to
use the stock starter and bellhousing) is an additional $450. These
prices are less shipping/handling/insurance (usually a flat rate of
$150). We can have one together in about 2 weeks if you would elect to
purchase one. Based on your vehicle information I would recommend a
3.66, 2.500, 1.73, 1.30, 1.00 with a 3.73 rear and a 3.50, 2.39, 1.72,
1.29, 1.00 with a 4.10 rear. Just for you information, the engine RPM
at 65mph would be, based on your tire size, 3490 with a 4.10 and 3170
with a 3.73. If your car run 120mph in the quarter, you would go
through at 6440 with a 4.10 and 5850 with a 3.73. Just thought you'd
like the info. If you have any other questions, please feel free to
call us at 717-867-4352 between 8am and 4pm, est., M-For just email us
again. Thanks,
Michael Long
V.P. G-Force Transmissions/Long Shifters
07-25-02 | 10:24 AM
#18
Rotary Freak
Joined: Oct 2001
Posts: 1,568
Likes: 2
From: N.J. USA
Angus that is an awesome picture and a real nice wheelie. Congrats on that 60' 1.36 that is just about perfect with a street car like yours. Angus on both the Rx3's we have , we are using G-Force. Like Mike long said on the e-mail a bit noisy but could take the power your beast is making. Angus it was nice chatting with you @Atco Raceway NJ. nice to meet another rotorhead from halfway around the globe.
07-25-02 | 10:52 AM
#19
Senior Member
Joined: Jul 2002
Posts: 616
Likes: 0
From: yeah
yes ive been very interested in this topic too.i have a 3rd gen but i am going to do a 3rotor conversion.i will need something that candle all that torque.i was thinkin about a t56 tranny(maybe a viper,takes 500 ft lbs stock).i did look at the seq.hewland one, but it is 9000.
where can i find info or a site on this g-force tranny.
where can i find info or a site on this g-force tranny.
07-25-02 | 12:34 PM
#20
Gaijin Racing
Joined: Feb 2001
Posts: 1,117
Likes: 0
From: Normal, IL
I think there is a bit of confusion here... maybe I'm wrong.
I think the Aussies are referring to a the GF-5R when they say Street Fighter. I've spoken with Mike Long and he says there is no such thing as a Street Fighter gforce tranny (and he makes them all!). Possibly someone got their USD and AUD confused? Or is it really that cheap down under? If so, I WANT ONE NOW!!!!!!!
I think the Aussies are referring to a the GF-5R when they say Street Fighter. I've spoken with Mike Long and he says there is no such thing as a Street Fighter gforce tranny (and he makes them all!). Possibly someone got their USD and AUD confused? Or is it really that cheap down under? If so, I WANT ONE NOW!!!!!!!
07-25-02 | 06:25 PM
#21
10.32 @ 133
Joined: Mar 2001
Posts: 1,362
Likes: 0
From: Sydney, Australia
I think the street fighter box 10sec is reffering to is a Tremac? I don't think anyone over here is running the GF5R box, only the GF2000 boxes in both manual shift and air shift, no that there is anything wrong with using those boxes 
07-26-02 | 07:14 PM
#25
Zilla Killer
Joined: Mar 2001
Posts: 333
Likes: 0
From: New Zealand
I was speaking to george at Pac performance last night and asked him about a G/box to suit a 20B of around 600-700HP, he suggested the Tremec.
They have a customer with one in an RX-3, untubbed and running 9's. About $5300AU with starter motor and they modify the input shaft etc and supply an adaprter so you can bolt an RX-4 bell housing to it.
just what i want, for when we need it(not for a while I think) . I just asked since I had read this topic just before i rang them for something else.
They have a customer with one in an RX-3, untubbed and running 9's. About $5300AU with starter motor and they modify the input shaft etc and supply an adaprter so you can bolt an RX-4 bell housing to it.
just what i want, for when we need it(not for a while I think) . I just asked since I had read this topic just before i rang them for something else.