AT to MT swap - Page 9 - RX8Club.com



Series I AT-Specific Performance Mods Discuss engine and transmission modifications for your AT equipped RX-8

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Old 01-07-2018, 09:06 AM   #201  
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Why not use a 4 port JDM ecu? If I recall correctly a forum member did that when his 4 port engine crapped out, he bought a complete JDM drivetrain and did an auto to manual swap. Seems to me that the JDM would be closer to your final goal than a US 6 port.
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Old 01-07-2018, 06:55 PM   #202  
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I had considered that, but wrt the Copp AP I don't have that particular software. If I have to purchase M/E t]software I could consider it. However, there were some software upgrades I know of for JDM ECUs that are known to cause CEL issues; one was for a ignition coil CEL code that was unique for Japan, and then there might be complications with upgrading it then maybe. M/E might still be able to handle that, but I don't really want to spend the money for add'l pcm software control if I don't have to.
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Old 03-04-2018, 04:49 PM   #203  
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dude, this is huge.... now I need some decent weather to run the wire!
had a break of warm-ish weather where i wasn't busy, so, i successfully completed this modification today.

went to my sacrificial AT 4 port engine harness and de-pin'd one wire [GREEN/BLACK] from the X-18 bulkhead harness plug and one wire [VIOLET] from one the PCM to engine plugs. [picked those colours because pin 4F, per the FSM, is violet, and picked green/black because it was the next wire up on the MT-wired bulkhead] after getting those wires, i crimped and soldered on a 1 pin molex connector. i felt the connector was "needed" because the engine side of the plugs in the PCM compartment include the X-18 bulkhead, along with plugs 1, 2, and 3. plugs 4, 5, and the male pinned section of the X-18 bulkhead are part of the car harnessing. if i ever had to remove the engine loom [say, to pull the engine again], i'd rather unplug the 1 pin molex and have the harnesses separated, vs. having to do more intrusive actions. also, i didn't feel like digging out the car side of X-18, snipping another wire, and extending it to PCM pin 4F.

in the cabin, snipped the GREEN/BLACK and BLACK/GREEN wires from the TCM connector next to the clutch pedal, crimped and soldered in a 2 pin molex connector, and did the same on my WPT-721 clutch pigtail. plugged everything together, fired up the car, held the pedal down, in gear. no throttle blipping.



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Old 03-14-2018, 10:47 PM   #204  
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Need help

Iím doing this swap and was wondering if there a way you can contact me plz help
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Old 03-17-2018, 11:42 AM   #205  
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Iím doing this swap and was wondering if there a way you can contact me plz help
Help with...what? I don't mind helping, but we need *something* to work with.

What's going on?
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Old 03-20-2018, 11:09 AM   #206  
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you still have the car shell? shoot me a text buddy
I still have the 8. At least for a while longer. It will be visiting the local dealership on Monday to get all the outstanding recalls processed (front control rod / bushing or similar, both front air bags, and the fuel pump).

I might have a buyer lined up. It is really hard to let her go, but she's been sitting the driveway for far too long and needs a good owner.
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Old 05-30-2018, 09:17 AM   #207  
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Hi guys.
I'm about to swap 5MT -> 6AT and wanted to ask several questions:
1) Are powerplant frames same on MT and AT? I know that 5MT and 6MT frames are the same but are MT and AT?
2) Same question about the driveshaft. I have a carbon fiber driveshaft on my 5MT. Do I need to get metal one from 6AT (or 4At if they are the same) or I can just use mine
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Old 05-30-2018, 10:18 AM   #208  
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1. PPF is the same on all cars.
2. Driveshafts are dimensionally identical. Use the carbon fiber one if its in good shape
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Old 05-30-2018, 10:50 AM   #209  
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BigBadChris, thank You.
One more question: is the spline part of the driveshaft same too? Will MT spline yoke fit AT?
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Old 05-30-2018, 12:45 PM   #210  
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That I do not feel confident answering. I had a local rotary shop do my swap! That being said, I believe the Original Poster indicated that he used the (heavier) AT driveshaft on his manual swap without issue.
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Old 05-30-2018, 07:16 PM   #211  
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Quote:
Originally Posted by EmiteR View Post
Hi guys.
I'm about to swap 5MT -> 6AT and wanted to ask several questions:
1) Are powerplant frames same on MT and AT? I know that 5MT and 6MT frames are the same but are MT and AT?
2) Same question about the driveshaft. I have a carbon fiber driveshaft on my 5MT. Do I need to get metal one from 6AT (or 4At if they are the same) or I can just use mine
Wait, if you have the 5-speed, that means it's a 4-port, right?

I don't think there would be an ECU that would work with both the 4-port engine and 6AT. The 6AT was paired with the 6-port, so you would need the 6-port engine as well. The 4AT was paired to the 4-port engine.
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Old 06-07-2018, 01:21 PM   #212  
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BigBadChris, thank you for the information. I've already ordered a 6AT from USA, it would take a month for it to be delivered to my place. But I haven't ordered a driveshaft and a powerplant frame. Hope mine will fit otherwise it will take me a month more to get right PPF and driveshaft.


UnknownJinX, you are right. But to be honest i must say I'm swapping piston engine using stock 6AT transmission from RX-8/Miata and Miata TCM (it has the same CAN data transferred between ECM and TCM but more suitable for piston engines shifting map). The trick is I don't want to face issues fitting non-RX-8 transmission to RX-8 frame and also I don't want to remove RX-8 powerplant frame facing issues with rear diff case mount and weakened body frame.
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