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I got a 5 speed rx8 transmission that i try to swap to the FD .I swap the bell housing and the rear shaft housing to rx8 transmission every think fit perfectly only issue is where the speedometer sensor plug in the output shaft of rx8 where you put the speedometer plastic gear on is 1/2 an inch lower then where the FD out put shaft.So from what i hear people say a 5 speeds rx8 transmission can be swap to an FD is not true. here an fd transmission you can see the plastic gear speedometer through where the sensor plug in. This is rx8 transmission with FD rear shaft housing on the speedometer gear is like 1/2 an inch off i put the speedometer sensor in it but there no contact of the gear to the sensor.
Left is an FD transmission right is the RX8.You can see that where the speedometer seat have a different height. Yes i did swap the speedometer gear of the FD to the rx8 output shaft is on the shaft in the picture. So i don’t think is an easy swap to do so i thing we have to change all the gear of the 8s to the FD main shaft.
Left is an FD transmission right is the RX8.You can see that where the speedometer seat have a different height. Yes i did swap the speedometer gear of the FD to the rx8 output shaft is on the shaft in the picture. So i don’t think is an easy swap to do so i thing we have to change all the gear of the 8s to the FD main shaft.
This is odd. I swapped a 5 speed Rx-8 trans into my FD and did not have this problem and had another friend who did the same thing. Where did you get this transmission from?
the RX8 version has added synchros that the FD version didn’t
Mazda had to narrow the gears slightly to fit them in, technically could be considered weaker because of that. However the previous owner of the car I bought from him was really beating on it hard when RX8 3rd let go. Making high torque below 5250 is usually what’s going to do that. He then switched out the S362SXE with an S369SXE and it shifted full boost to occur around 5300 rpm. So the engine can make the same or higher HP with less torque from 5250 rpm and higher.
I’d be surprised if they changed it on the S2 version. There’d be no reason to do that unless it was a manufacturing related reason. The EU version had a different 3rd and 5th ratio, but I’ve never seen or heard of one being imported from there to North America and it being bought from a California importer is most likely making it a JP model. They typically will list the model year though; S2 production began in the 2009 MY.
I was referring to you bailing on the RX8 5-speed. The importers have cut back on selling the trans only because nobody who knows any better wants the low power RX8 engine that it comes on, by itself. They then end up sitting on the engine or cutting the price way back to move it.
I lucked into a low mileage RX8 5-spd from a local JDM importer with a $350 cash on the spot offer on a Saturday afternoon just before they were about to close several years ago. I don’t think they ever brought in another RX8 since then. There’s not any engine advantage at all JDM vs NADM and they just don’t sell like some of the other more popular JDM engines.
Because unlike on a 13B, a Renesis engine is all about rotor sealing when it comes to optimizing the rated power output. The repositioning of the intake ports to extreme early opening coupled with zero intake-exhaust overlap relies totally on the long intake draw and no leakage past the rotor seals to pull in as much intake air as possible. I’ve been saying for many years now that despite the similarities, the Renesis is technically a different engine compared to a 13B because of this.
And both the rotors and rotor housings should always be replaced on a rebuild, and the center iron possibly too because the divider in the shared siamese exhaust port is susceptible to fatiguing and coming out. The exception is if the rotors are EDM’d deeper for full depth RX7 apex seals, especially when combined with Iannetti ceramic seals. Then you can get multiple rebuilds out of them as per the Formula Mazda race cars that were making around 235 whp with blueprinted Renesis engines and those mods on factory ports (never port a Renesis much past just cleaning up the sharp edges and rough casting marks).
The shallow Renesis apex seal was a mistake by Mazda imo. Think of it as a hole in the ground for putting in a fence post. The shallower the hole, the easier it is to rock the fence post back and forth to wallow the support hole out. It’s a lot harder to do that with a deeper hole. 160 - 180 whp RX8s are the norm due to excessive blowby on the rotor seals. When you get it right then 220 - 230 whp is what can be expected. Well, sorry to go off-topic on that. Kind of passionate subject for me.
03-18-23, 01:49 AM
