The Rx8 6-Speed into an FB Thread!

Whizbang · 11-14-2009, 03:46 PM

Im sure much of the information can cross into other chassis.

General Rx8 Transmission Information

Mazda Rx-8 04-current 13B Renesis Gearbox (manual)
1st: 3.815
2nd: 2.260
3rd: 1.536
4th: 1.177
5th: 1.00
6th: 0.787

The most popular "close ratio" conversion i have seen is the miata box. Below is a comparison of the miata box to the Rx8 box given a 9000 shift point and 4.78 final drive (my personal setup).

Now here is the 12a transmission i have currently versus the Rx8. much better!

And also the Turbo II's R type transmission (87-88) compared to the Rx8. Again, 1st and 2nd are similar, but from there on out, for my natural aspiration application, the gearing is superior.

Whizbang · 11-14-2009, 03:47 PM

Parts Needed For Swap and Other Considerations

-Mazda Rx8 Transmission. 04-08 (not familiar with the newer 09 up models as they are a different manufacture but im assuming this same guide line could work)
-Turbo Flywheel and Clutch (compare 235/240 to the 236 of the Rx8)
-Rx8 Starter
-Rx8 Shifter
-Metal stock for the transmission mount
-Solution for the slave cylinder, will finalize something soon enough
-Final solution for drive shaft will come soon. Output shaft is same as a turbo II though.

Things to Think About

Now my setup lends this swap to be simpler than most. The transmissions in the FB were shorter than the FC chassis so the shifter position is not as effected as the FC will be. For the FC the shifter will move 3.5" forward. This will be less for the FB. Guesstimating around 2" to 2.5" for the FB. Add that to the fact im tall and the shifter location is essentially a non issue.

Also, i dont have a speedometer so the whole electronic speedo thing is a non issue for me. If you happen to want to retain the mechanical speedo, then well, you have problems that im not going to address for you. Real men don't need speedos. Or wear them. Its a man law.

Whizbang · 11-14-2009, 03:47 PM

Transplanting the Rx8 Transmission

Whizbang · 11-14-2009, 03:48 PM

Comparing the Rx8 Transmission

Whizbang · 11-14-2009, 03:50 PM

Results

***TitaniumTT*** · 11-14-2009, 05:34 PM

Lemme know if you need any measurements, diameter, splines, etc etc etc.... I have that box dissasembled on my work bench right now.

Whizbang · 11-14-2009, 05:35 PM

Quote:

Originally Posted by TitaniumTT

Lemme know if you need any measurements, diameter, splines, etc etc etc.... I have that box dissasembled on my work bench right now.

i wouldnt mind an any and all if you can. Also note my pm.

Whizbang · 11-14-2009, 05:40 PM

in particular, the input and out splines and diameters, length of the transmission, pictures of mount location etc.

Renesisking · 05-16-2011, 12:20 AM

Subscribed! I am very interested in your results.

Whizbang · 05-16-2011, 09:33 PM

minor update, i have sourced myself two transmissions, maybe three. Moving at the end of this month so i wont be messing around with that for a little while still. But once i have them on hand ill be taking them apart.

mazpower · 06-02-2011, 04:26 PM

I'll be doing this soon in my FB with a NA 20B powering it. Gonna move the whole engine back to get the shifter to line up and help with the weight balance a bit.

87T2_FC · 06-04-2011, 06:46 PM

I am considering this behind a 13bt in my 83 but i see the results are for a n/a app.

Gotpam? · 07-18-2011, 05:50 PM

Any updates?

Raksj04 · 10-26-2011, 07:43 PM

I thought the RX-8 trans was not that strong. weaker then the TII

speedjunkie · 10-27-2011, 03:22 AM

Quote:

Originally Posted by Gotpam?

Any updates?

He's deployed right now.

Quote:

Originally Posted by Raksj04

I thought the RX-8 trans was not that strong. weaker then the TII

I've heard it is too, but I'm not sure if this is going to be a boosted application, so it might not matter.

11-14-2009, 03:46 PM	#1
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	The Rx8 6-Speed into an FB Thread! Im sure much of the information can cross into other chassis. General Rx8 Transmission Information Mazda Rx-8 04-current 13B Renesis Gearbox (manual) 1st: 3.815 2nd: 2.260 3rd: 1.536 4th: 1.177 5th: 1.00 6th: 0.787 The most popular "close ratio" conversion i have seen is the miata box. Below is a comparison of the miata box to the Rx8 box given a 9000 shift point and 4.78 final drive (my personal setup). Now here is the 12a transmission i have currently versus the Rx8. much better! And also the Turbo II's R type transmission (87-88) compared to the Rx8. Again, 1st and 2nd are similar, but from there on out, for my natural aspiration application, the gearing is superior. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 11-14-2009 at 05:32 PM..

11-14-2009, 03:47 PM	#2
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Parts Needed For Swap and Other Considerations -Mazda Rx8 Transmission. 04-08 (not familiar with the newer 09 up models as they are a different manufacture but im assuming this same guide line could work) -Turbo Flywheel and Clutch (compare 235/240 to the 236 of the Rx8) -Rx8 Starter -Rx8 Shifter -Metal stock for the transmission mount -Solution for the slave cylinder, will finalize something soon enough -Final solution for drive shaft will come soon. Output shaft is same as a turbo II though. Things to Think About Now my setup lends this swap to be simpler than most. The transmissions in the FB were shorter than the FC chassis so the shifter position is not as effected as the FC will be. For the FC the shifter will move 3.5" forward. This will be less for the FB. Guesstimating around 2" to 2.5" for the FB. Add that to the fact im tall and the shifter location is essentially a non issue. Also, i dont have a speedometer so the whole electronic speedo thing is a non issue for me. If you happen to want to retain the mechanical speedo, then well, you have problems that im not going to address for you. Real men don't need speedos. Or wear them. Its a man law. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 11-14-2009 at 07:11 PM..

11-14-2009, 03:47 PM	#3
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Transplanting the Rx8 Transmission __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 11-14-2009 at 07:00 PM..

11-14-2009, 03:48 PM	#4
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Comparing the Rx8 Transmission __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 11-14-2009 at 07:01 PM..

11-14-2009, 03:50 PM	#5
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Results __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook Last edited by Whizbang; 11-14-2009 at 07:01 PM..

11-14-2009, 05:34 PM	#6
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Lemme know if you need any measurements, diameter, splines, etc etc etc.... I have that box dissasembled on my work bench right now. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

11-14-2009, 05:40 PM	#8
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	in particular, the input and out splines and diameters, length of the transmission, pictures of mount location etc. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

05-16-2011, 12:20 AM	#9
Renesisking Rotary Fan in Training Join Date: May 2009 Location: Connecticut iTrader: (0) Posts: 39 Rep Power: 0	Subscribed! I am very interested in your results. __________________ 2004 RX-8. I would love to tune it but can't find the right parts for Microtech

05-16-2011, 09:33 PM	#10
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	minor update, i have sourced myself two transmissions, maybe three. Moving at the end of this month so i wont be messing around with that for a little while still. But once i have them on hand ill be taking them apart. __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

06-02-2011, 04:26 PM	#11
mazpower Rawr Bearclaw Join Date: Feb 2008 Location: The Souf iTrader: (1) Posts: 197 Rep Power: 17	I'll be doing this soon in my FB with a NA 20B powering it. Gonna move the whole engine back to get the shifter to line up and help with the weight balance a bit. __________________ Illicit Performance Rotary building, porting, tuning, chassis dyno services www.illicitperformance.com

06-04-2011, 06:46 PM	#12
87T2_FC aka boostaholic13b Join Date: Jun 2010 iTrader: (0) Posts: 4 Rep Power: 0	I am considering this behind a 13bt in my 83 but i see the results are for a n/a app. Last edited by 87T2_FC; 06-04-2011 at 06:49 PM..

07-18-2011, 05:50 PM	#13
Gotpam? Murderilcious Join Date: Jun 2011 iTrader: (0) Posts: 22 Rep Power: 0	Any updates?

10-26-2011, 07:43 PM	#14
Raksj04 I have Ultra power in me. Join Date: Sep 2011 iTrader: (2) Posts: 457 Rep Power: 13	I thought the RX-8 trans was not that strong. weaker then the TII