How this idea? 20B + RX8 Transmission - Page 3

***TitaniumTT*** · 06-01-2010, 12:07 PM

Any competent shop (cough ahem KDR cough) knows about the problems and knows how to deal with them internally and properly. Mazda even had a TSB on it apparently and sells a different linkage that prevents the over extension.

project86 · 06-01-2010, 12:26 PM

Well as of now it sounds like there is a firm grasp on the problem and plenty of competent people (cough ahem TTT/KDR cough) and a way to make it work.... dooo itk!

Renesisking · 06-01-2010, 02:06 PM

wow, i didn't think it was that much of an issue. How hard is it to not push it further or to fully keep the clutch in until it goes into gear? What is the final drive ratio in the FC/FD? I know the RX-8 has a 4.44 and the second gen has a 4.77. Suppose I did do this swap and kept the stock 8 tranny, would it be fine with the stock 4.44? I think Motortrend had an article where they tested the R3 RX-8 which had the 4.77 gear ratios and they said that other than straight line performance it wasn't any benefit, and that around a track or autoX the older tranny/diff setup was more beneficial and had the right ratios to get the job done.

***TitaniumTT*** · 06-01-2010, 06:16 PM

Quote:

Originally Posted by Renesisking

wow, i didn't think it was that much of an issue. How hard is it to not push it further or to fully keep the clutch in until it goes into gear?

Pushing it too far is only one issue. It over extends the hub and bing.... The other issue is idiots grabbing hard and the sync not being fast enough, or the force being too hard and the hub tweaks and bing...

Quote:

Originally Posted by Renesisking

What is the final drive ratio in the FC/FD? I know the RX-8 has a 4.44 and the second gen has a 4.77.

Gear ratio's in non auto FC/FD are 4.11:1 with a few exceptions.

Quote:

Originally Posted by Renesisking

Suppose I did do this swap and kept the stock 8 tranny, would it be fine with the stock 4.44? I think Motortrend had an article where they tested the R3 RX-8 which had the 4.77 gear ratios and they said that other than straight line performance it wasn't any benefit, and that around a track or autoX the older tranny/diff setup was more beneficial and had the right ratios to get the job done.

What swap? The 20b swap? Yeah, it'll be fine. IIRC the 8's tires are taller as well which nessitated the higher ratio. A Renni tranny in a turbo or ported FC would be about damn perfect according to my math. We shall see though. But for an auto-x, it would be a JOY compared to the TII box. That thing is miserable for auto-x.... I fucking hate it.

Renesisking · 06-01-2010, 06:53 PM

Thanks! Last time I saw you at AutoX you were pretty fast. I take it that your ratios are not best suited for that. In most courses I'm in 2nd but I'm just at the lower end of my power. I'm probably around 6000rpms and would much rather be around 7 when all my power kicks in.

***TitaniumTT*** · 06-01-2010, 07:14 PM

Thanks man.

Ratio's definately suck. I'm high in the rev's in 1st.... 1st! And will occasioanly hit 2nd. With the 8 box in my car I can tool around in 2nd with a TON of torque at my disposal. My torque comes on hard ~3500-4k and holds till 7. Anywhere in that range I'm good. With the TII box I'm either high in the rev's in 1st or bogging slightly in 2nd. I hate that box.

Have you ever raced with FCSCC? Their courses are usually a little looser. I gotta get on the dyno and make it back to CART. Are you going to thier Limerock day? As of right now I'm attending, but waiting to see what happens Friday before I pay.

Renesisking · 06-01-2010, 07:20 PM

My first autoX was with FCSCC, I really liked them over CART. The courses are a bit faster and not as tight and they're pretty cool about stuff. I'm going to the next FCSCC meet. I'd like to do CART but unless I quiet my exhaust down, it wouldn't be wise for me to show up. BTW, I see whole car part outs on rx8club.com if you want a RX-8 transmission. I'd really like to get a flywheel so that my RPMs cam climb quicker so I'm in my sweet spot more often than not, the only thing is I'm not sure how quickly the revs drop (it may or may not be beneficial as I may lose some mid range torque).

***TitaniumTT*** · 06-01-2010, 11:18 PM

You will only gain torque by freeing up rotating mass. It may feel like you loose torque off the line but the dyno says otherwise. What you feel is the drop in inertia. Less energy stored in a lighter flywheel...

Totally botched the physics but you get it

06-01-2010, 12:07 PM	#31
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	Any competent shop (cough ahem KDR cough) knows about the problems and knows how to deal with them internally and properly. Mazda even had a TSB on it apparently and sells a different linkage that prevents the over extension. __________________ -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-**

06-01-2010, 12:26 PM	#32
project86 Can't.Make.Up.My.Mind. Join Date: May 2009 Location: Murfreesboro, TN Posts: 1,377 Rep Power: 18	Well as of now it sounds like there is a firm grasp on the problem and plenty of competent people (cough ahem TTT/KDR cough) and a way to make it work.... dooo itk! __________________ '90 GTUs Stay up to date with my photography '06 Toyota Highlander Hybrid '10 Toyota Prius "Initial Success or Total Failure"

06-01-2010, 02:06 PM	#33
Renesisking Rotary Fan in Training Join Date: May 2009 Location: Connecticut Posts: 39 Rep Power: 0	wow, i didn't think it was that much of an issue. How hard is it to not push it further or to fully keep the clutch in until it goes into gear? What is the final drive ratio in the FC/FD? I know the RX-8 has a 4.44 and the second gen has a 4.77. Suppose I did do this swap and kept the stock 8 tranny, would it be fine with the stock 4.44? I think Motortrend had an article where they tested the R3 RX-8 which had the 4.77 gear ratios and they said that other than straight line performance it wasn't any benefit, and that around a track or autoX the older tranny/diff setup was more beneficial and had the right ratios to get the job done. __________________ 2004 RX-8. I would love to tune it but can't find the right parts for Microtech

06-01-2010, 06:53 PM	#35
Renesisking Rotary Fan in Training Join Date: May 2009 Location: Connecticut Posts: 39 Rep Power: 0	Thanks! Last time I saw you at AutoX you were pretty fast. I take it that your ratios are not best suited for that. In most courses I'm in 2nd but I'm just at the lower end of my power. I'm probably around 6000rpms and would much rather be around 7 when all my power kicks in. __________________ 2004 RX-8. I would love to tune it but can't find the right parts for Microtech

06-01-2010, 07:14 PM	#36
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	Thanks man. Ratio's definately suck. I'm high in the rev's in 1st.... 1st! And will occasioanly hit 2nd. With the 8 box in my car I can tool around in 2nd with a TON of torque at my disposal. My torque comes on hard ~3500-4k and holds till 7. Anywhere in that range I'm good. With the TII box I'm either high in the rev's in 1st or bogging slightly in 2nd. I hate that box. Have you ever raced with FCSCC? Their courses are usually a little looser. I gotta get on the dyno and make it back to CART. Are you going to thier Limerock day? As of right now I'm attending, but waiting to see what happens Friday before I pay. __________________ -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-**

06-01-2010, 07:20 PM	#37
Renesisking Rotary Fan in Training Join Date: May 2009 Location: Connecticut Posts: 39 Rep Power: 0	My first autoX was with FCSCC, I really liked them over CART. The courses are a bit faster and not as tight and they're pretty cool about stuff. I'm going to the next FCSCC meet. I'd like to do CART but unless I quiet my exhaust down, it wouldn't be wise for me to show up. BTW, I see whole car part outs on rx8club.com if you want a RX-8 transmission. I'd really like to get a flywheel so that my RPMs cam climb quicker so I'm in my sweet spot more often than not, the only thing is I'm not sure how quickly the revs drop (it may or may not be beneficial as I may lose some mid range torque). __________________ 2004 RX-8. I would love to tune it but can't find the right parts for Microtech

06-01-2010, 11:18 PM	#38
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son Posts: 4,581 Rep Power: 10	You will only gain torque by freeing up rotating mass. It may feel like you loose torque off the line but the dyno says otherwise. What you feel is the drop in inertia. Less energy stored in a lighter flywheel... Totally botched the physics but you get it __________________ -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-**