RX7 fd3s transmission in MX5 - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 01-26-2008, 10:47 AM   #21
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

no- the advantage of bigT's solution is that you can cut the bell to position the input shaft where you want. Of course that'll also dictate the position of the stick thru the hole if you don't compensate for that. The miata solution typically is the adapter plate because it is easy and cheaper than the welding- and it works for as much power as anybody has made.
m2cupcar is offline   Reply With Quote
Old 01-26-2008, 10:25 PM   #22
Elite Member
iTrader: (6)
 
Loki047's Avatar
 
Join Date: Sep 2005
Location: Chicago
Posts: 4,145
Total Cats: 0
Default

So does anyone have a rx7 bellhousing?
Loki047 is offline   Reply With Quote
Old 01-26-2008, 10:32 PM   #23
Elite Member
iTrader: (17)
 
Join Date: May 2007
Location: NY
Posts: 1,614
Total Cats: 2
Default

Subscribing...pretty impresive bigturbo...
I wanna see someone start pumping out adapter plates to allow for bolt on trans's...very interesting topic guys
TonyV is offline   Reply With Quote
Old 01-27-2008, 12:15 AM   #24
Senior Member
iTrader: (9)
 
Join Date: Jun 2007
Location: NH
Posts: 981
Total Cats: 20
Default

Quote:
Originally Posted by m2cupcar View Post
no- the advantage of bigT's solution is that you can cut the bell to position the input shaft where you want. Of course that'll also dictate the position of the stick thru the hole if you don't compensate for that. The miata solution typically is the adapter plate because it is easy and cheaper than the welding- and it works for as much power as anybody has made.
With the adaptor, I've read through crash41301's swap a few times. I'm getting tripped up with the clutch fork pivot bolt/ throwout bearing mod. Can you possibly give me a better description of what to do here? How do you get the throwout bearing to sit 1/2" farther forward?
mighty mouse is offline   Reply With Quote
Old 01-27-2008, 12:14 PM   #25
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

Loki - I have one rx7 bell, attached to the box. But I'm not going to give it up yet, not until I've completed the project. What I did was just call around to mazda shops until I found that had two of the boxes that were in the way. They gave them to me. Same shop gave me three 1.6 engines like five years ago. The owner is a racer, so he'd rather give them to me than the junk man. IMO a lot of these owners will take interest if you tell them what your up too - like a 300hp miata...

I thought there was somebody in fla on m.net that did a bunch of adapter plates... don't know if it ever came to fruition. I do think that Loki could probably sell at least 5 of them- more if he pushed them on m.net. Just need to figure out what it's worth to others, and to him.

I can't. I'm not doing it that way- different engine. I'm using a van bell housing which has the normal clutch fork position. I've already been through the resolution for the process on my own tho. I'm using a b2000 truck bell on a miata housing with an 80s 626 flywheel, 1.8 Miata clutch & pp. I made all my adjustments to ensure proper engagement/disengagement through the slave rod length- trial and error.
m2cupcar is offline   Reply With Quote
Old 01-27-2008, 05:13 PM   #26
Junior Member
Thread Starter
 
Join Date: Dec 2005
Location: Greece, athens
Posts: 98
Total Cats: 0
Default

Quote:
Originally Posted by PaKMaN View Post
I'm still trippin about the fact that you have a greddy E manage
I have explain it many times. One of them, is here

Quote:
Originally Posted by BIGTURBO View Post
Quote:
Originally Posted by Savington View Post


Almost seems like sacrilege to be running a GT2876R on an E-manage. How much power?
It's not so sacrilege as you think.

Actually, the EM in my setup, is a custom, DIY management with 8 injectors, and it is very easy to tune.
At off boost situations,cold starts etc, is like a stock miata. Something that is very difficult to find and tune with stand alones.
BIGTURBO is offline   Reply With Quote
Old 01-27-2008, 05:17 PM   #27
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Did you swap out tranny interals for better gearing?
magnamx-5 is offline   Reply With Quote
Old 01-27-2008, 05:20 PM   #28
Junior Member
Thread Starter
 
Join Date: Dec 2005
Location: Greece, athens
Posts: 98
Total Cats: 0
Default

The lever it's almost at the stock position (1 cm behind) as you can see at this foto


For some of the other questions, sorry but I cannot follow some of the elaborator meanings (not very good english )

If I had better explains to some meanings maybe I could help better.
But I thing that the most have understand tottaly about the modification.
BIGTURBO is offline   Reply With Quote
Old 01-27-2008, 05:26 PM   #29
Junior Member
Thread Starter
 
Join Date: Dec 2005
Location: Greece, athens
Posts: 98
Total Cats: 0
Default

Quote:
Originally Posted by magnamx-5 View Post
Did you swap out tranny interals for better gearing?
Nope, I just buy from a friend (only for 200$ ) an RX7 fd3s '95 model transmission with very little kms. It was at very good situation so I put it as it was.
BIGTURBO is offline   Reply With Quote
Old 01-27-2008, 08:11 PM   #30
Senior Member
iTrader: (9)
 
Join Date: Jun 2007
Location: NH
Posts: 981
Total Cats: 20
Default

how much did you cut off of each bellhousing?
mighty mouse is offline   Reply With Quote
Old 02-16-2008, 10:41 PM   #31
Elite Member
iTrader: (8)
 
Join Date: Oct 2007
Location: Dallas
Posts: 1,841
Total Cats: 0
Default car

Dude, This is sweet. And to mod and weld something that works great under that force is awesome!!!!
Toddcod is offline   Reply With Quote
Old 04-14-2009, 04:18 AM   #32
Junior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Palm Harbor FL
Posts: 332
Total Cats: 4
Default

hmm do any b6 or bp trannies have bolt on bell housings?
if so then an adapter plate between the gear box and the bell housing would be a an easier and better solution to an adapter between the block and the tranny.
1slowna is offline   Reply With Quote
Old 06-03-2010, 01:14 AM   #33
Elite Member
iTrader: (12)
 
Join Date: May 2007
Location: Austin, TX
Posts: 1,923
Total Cats: 0
Default

How's this holding up now that you've been driving it for a few years?
JayL is offline   Reply With Quote
Old 06-03-2010, 01:28 AM   #34
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

Quote:
Originally Posted by BIGTURBO View Post
Because I have many answers about this modification, I decided to open a topic for this.

Well

The miata transmission is very nice, but can't handle safely more than 250 WHP.

At stock situations or at light turbo setups you 'll not deal with problems, but with 300+ WHP the 2th or 3th gear sometimes will gone

So there are two solutions
1)exotic stuff gears (os giken, quaife etc) but very expensive
2)adaptate transmission from another car, more inexpensive from the first solution but very difficult to do a perfect job.

So I put a turbo trans model "R" from RX7 fd3s (93-95).
It was from the beginning a difficult modification but the engineer succeed in this 100%.

The gear lever is exactly in the same position like the stock, and the "sense" of changing gears maybe is better than a stock transmission miata.
The 1-2-3d gears are a little shorter than stock gear ratio
The 4th is the same 1:1 ratio
And the 5th is much longer than stock ratio!! And this is very nice for a 380+ hp turbo miata!

The modification based to a new housing between the block and the RX7 transmission. We modificated the miata housing (bellhousing? ) and connect to its end, the end of the RX7 housing.It was a very difficult job because it had to be perfect at straight line with the stock one.
You will see at the fotos what exactly we have do because my english are not so good to explain exactly what I want to tell.
The driveshaft was cut and modificated to match to the RX7 transmission.

Don't know why you would want an FD tranny. They aren't exactly known to be reliable. Ask me about my two broken trannys from my FD sitting in my shed.
falcon is offline   Reply With Quote
Old 06-03-2010, 01:34 AM   #35
Elite Member
iTrader: (12)
 
Join Date: May 2007
Location: Austin, TX
Posts: 1,923
Total Cats: 0
Default

Quote:
Originally Posted by falcon View Post
Don't know why you would want an FD tranny. They aren't exactly known to be reliable. Ask me about my two broken trannys from my FD sitting in my shed.
Tell me about your two broken trannys from your FD. I'm looking into this swap with either a FD or the TII FC tranny which is pretty much the same.
JayL is offline   Reply With Quote
Old 06-03-2010, 01:36 AM   #36
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

The first one shredded 3rd gear shifting from 2nd WOT when the car was stock. Approx 250ish whp. The second I blew the 5th gear syncro (known problem in the FD trans) at 380whp. The current one is holding strong. We'll see how it lasts.

FD guys swap TII trans in because they are stronger. Go for the TII.

Guys on the FD forums are known to refer to the FD trans as glass... lol
falcon is offline   Reply With Quote
Old 06-03-2010, 01:42 AM   #37
Elite Member
iTrader: (12)
 
Join Date: May 2007
Location: Austin, TX
Posts: 1,923
Total Cats: 0
Default

From what I have seen doing research, the only differences between the TII tranny and the turbo FD tranny are the syncros which made it shift better (although it would appear otherwise in your situation). Powerwise I'm being told it's a wash. I've gotten all this information from FD owners.
JayL is offline   Reply With Quote
Old 06-03-2010, 02:09 AM   #38
Elite Member
iTrader: (13)
 
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13
Default

You're right on the smoothness of shifting. The TII won't be right there... but from my understanding it will hold more power and take a bit more of a beating before any issues arise.

Realisticaly, for a Miata power wise you're OK with either. Syncro wise, I would say to go with the TII. Or have an FD box rebuilt with all new syncros and run good fluid from the get-go.
falcon is offline   Reply With Quote
Old 06-03-2010, 09:57 AM   #39
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

What's odd is that those transmission are both essentially the same unit- based on the same Mazda R gearbox. I suppose it's possible that changes to improve drivability were done at a compromise to strength. You never hear of people braking the TII version in a Miata- and this is the only case I know of that is using the FD box.
m2cupcar is offline   Reply With Quote
Old 06-03-2010, 08:04 PM   #40
Newb
 
Join Date: Jun 2010
Location: Lancaster, CA
Posts: 18
Total Cats: 0
Default

bad *** swap. FB rx7 guys have been using the Miata gear sets for years not I was waiting for the reverse to happen.
Hyper4mance2k is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
WTB Bellhousing Bolts patsmx5 WTB 1 10-01-2015 10:43 AM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:03 AM.