anyone using JDM 5 speed transmission for track car? - RX8Club.com

Go Back  RX8Club.com > RX-8 Competition > RX-8 Racing
Reload this Page >

anyone using JDM 5 speed transmission for track car?

Notices
RX-8 Racing Want to discuss autocrossing, road-racing and drag racing the RX-8? Bring it here. This is NOT a kills/street racing forum.

anyone using JDM 5 speed transmission for track car?

Old 07-30-2018, 08:11 AM
  #1  
Registered
Thread Starter
 
trackjunkie's Avatar
 
Join Date: Oct 2017
Location: South Central PA
Posts: 276
Thanked 9 Times in 9 Posts
anyone using JDM 5 speed transmission for track car?

I'm installing a new motor in the near future and was considering doing a new tranny also. Cant decide between S2 or JDM 5 speed. it will be paired with a 5.1 diff. if you have one for street or track, what's your feed back on it.
trackjunkie is offline  
Old 07-30-2018, 08:23 AM
  #2  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 648
Thanked 55 Times in 52 Posts
The 5-speed is a must for a turbo car. Strength of transmission aside, the longer gears are necessary when dealing with a 4.44 rear end.

But for NA puproses, none of that applies... In short, this has been of no help to you
strokercharged95gt is online now  
Old 07-30-2018, 08:36 AM
  #3  
Registered
Thread Starter
 
trackjunkie's Avatar
 
Join Date: Oct 2017
Location: South Central PA
Posts: 276
Thanked 9 Times in 9 Posts
so the 5 speed is definitely stronger?

gear ration comparison
jdm: 3.483, 2.015, 1.484, 1.000, 0.762
S1: 3.760, 2.269, 1.645, 1.187, 1.00, .843
S2: 3.815, 2.260, 1.640, 1.177, 1.00, .843

from the few tracks that I have driven on with the rx8 so far (stock s1 tranny and diff), i can't imagine any tracks where i would need to use 6th gear. but that might change once i install the 5.1 diff?

the s1 and s2 5th is 1:1, and the 5 speed is 4th for 1:1, which mean i probably wont use 5th on the 5 speed neither.
trackjunkie is offline  
Old 07-30-2018, 08:37 AM
  #4  
Registered
iTrader: (4)
 
Join Date: Aug 2014
Location: Dallas TX
Posts: 671
Thanked 21 Times in 17 Posts
Brett has a turbo, a five speed and occasionally tracks his car. Hope that helps
BigBadChris is offline  
Old 07-30-2018, 09:32 AM
  #5  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 648
Thanked 55 Times in 52 Posts
Originally Posted by trackjunkie View Post
so the 5 speed is definitely stronger?
What do you think? Look at the difference in case size between the 5-speed (left) and 6-speed (right)



strokercharged95gt is online now  
Old 07-30-2018, 11:08 AM
  #6  
Not ******
iTrader: (1)
 
John V's Avatar
 
Join Date: Jan 2004
Posts: 635
Thanks: 0
Thanked 9 Times in 9 Posts
My understanding is that the 5-speed is internally identical to the FD RX-7 TT transmission (and therefore the same as the FC RX-7 TII trans). If that's the case, it's very strong - it's what I'm using for my turbo Duratec build.

JV
John V is online now  
Old 07-30-2018, 02:48 PM
  #7  
Registered
 
furansu's Avatar
 
Join Date: Mar 2018
Location: Colorado Springs
Posts: 178
Thanked 18 Times in 18 Posts
Originally Posted by John V View Post
My understanding is that the 5-speed is internally identical to the FD RX-7 TT transmission (and therefore the same as the FC RX-7 TII trans). If that's the case, it's very strong - it's what I'm using for my turbo Duratec build.

JV
Damn near the same externally as well. The bell has slight changes and some significant changes with the tailhousing, however the inner-case is almost identical to an FD. The FD is an enhanced version of the TII (S4/S5) transmission.

If a 5spd was readily available, I wouldn't be opposed to it. The FD transmission is still one the best I've ever shifted.
furansu is offline  
Old 07-30-2018, 03:02 PM
  #8  
Registered
Thread Starter
 
trackjunkie's Avatar
 
Join Date: Oct 2017
Location: South Central PA
Posts: 276
Thanked 9 Times in 9 Posts
is the 5 speed a direct swap? same clutch ect.
trackjunkie is offline  
Old 07-30-2018, 04:02 PM
  #9  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 648
Thanked 55 Times in 52 Posts
Should be. I had to grind off a dowel that was on one of the upper passenger side bolt holes, but that was to fit a REW iron. May be a perfect fit for a MSP rear iron....
strokercharged95gt is online now  
Old 07-30-2018, 10:55 PM
  #10  
Registered
 
Mr. Pockets's Avatar
 
Join Date: Mar 2008
Location: Champaign, IL
Posts: 466
Thanked 7 Times in 6 Posts
Sorry, I don't have any experience with the 5-speed. But you mention the S2, which I do have.

The S2, with the 5.125 final drive, is a fantastic combination in the RX8. The transmission is super stout, and the gearing is awfully good for the track. 3rd climbs out of most corners incredibly well.
Mr. Pockets is offline  
The Following User Says Thank You to Mr. Pockets For This Useful Post:
hufflepuff (09-25-2018)
Old 07-31-2018, 12:10 AM
  #11  
Registered
 
furansu's Avatar
 
Join Date: Mar 2018
Location: Colorado Springs
Posts: 178
Thanked 18 Times in 18 Posts
I wanted to note that the 5spd does use a different clutch and flywheel (I visually confirmed this against a European 5spd/4port engine). I suspect that you can use a 6spd clutch, as long as you are also using a 6spd flywheel (or 6spd aftermarket LWFW). Your potential pain point will be input shaft spline count between 5spd and 6spd. I suppose it is also possible the clutch/flywheel diameter could differ, leading to possible bellhousing interference.
furansu is offline  
Old 07-31-2018, 07:58 AM
  #12  
Registered
Thread Starter
 
trackjunkie's Avatar
 
Join Date: Oct 2017
Location: South Central PA
Posts: 276
Thanked 9 Times in 9 Posts
Originally Posted by Mr. Pockets View Post
Sorry, I don't have any experience with the 5-speed. But you mention the S2, which I do have.

The S2, with the 5.125 final drive, is a fantastic combination in the RX8. The transmission is super stout, and the gearing is awfully good for the track. 3rd climbs out of most corners incredibly well.
good to hear that. any issues with increased diff temp with the 5.1?
trackjunkie is offline  
Old 08-01-2018, 08:58 AM
  #13  
Registered
 
Mr. Pockets's Avatar
 
Join Date: Mar 2008
Location: Champaign, IL
Posts: 466
Thanked 7 Times in 6 Posts
Originally Posted by trackjunkie View Post
good to hear that. any issues with increased diff temp with the 5.1?
I have absolutely no idea. Sorry.
Mr. Pockets is offline  
Old 09-17-2018, 11:48 AM
  #14  
Registered
iTrader: (6)
 
Schartz's Avatar
 
Join Date: Apr 2009
Posts: 124
Thanks: 0
Thanked 4 Times in 2 Posts
I am using the JDM 5-speed in my track car, 13B-REW engine, Rx8 Clutch. Fit right in place. Works very well! But I am turbo'd making 464whp. Someday would like to go sequential. But the 5-speed will do for now.
Schartz is offline  
Old 09-26-2018, 07:44 PM
  #15  
New Member
 
Join Date: Nov 2017
Location: Philly Area
Posts: 3
Thanked 0 Times in 0 Posts
5spd track car

Here is my RX8 at
I bought from a friend who was endurance racing it with the original 6spd, but a few gearbox issues and a couple of engine failures he had a specialist build the current engine and swapped in the 5spd. The issue I have is the 4.44 is too tall and I need to get a 4.78, so if anyone has a contact to get a hold of a 4.78 message me.

Anthony
Golden Rotor Racing & Rental


acbauza is offline  
Old 11-04-2018, 05:16 PM
  #16  
Registered
 
Join Date: Oct 2018
Location: Olympia
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
i ended up with a JDM 5 speed and never got around to putting it in,. . i do feel like im missing out though
BwapTron is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
grybas
New Member Forum
5
06-05-2017 11:41 AM
TrexM3
RX-8 Parts For Sale/Wanted
8
02-28-2012 12:16 PM
opus_opus
RX-8 Racing
56
11-27-2008 09:22 AM
Mr986
Series I Wheels, Tires, Brakes & Suspension
4
06-26-2007 12:07 AM
Matt RX8
RX-8 Racing
79
05-09-2005 12:16 AM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: anyone using JDM 5 speed transmission for track car?


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.