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Old 10-21-2018, 09:21 PM
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1JZ Engine Swap

Decided to go ahead and start this swap thread. You'll have to be patient with me as this swap isn't going to happen over night. I have a wife and 4 daughter's, so time can be limited some days. But my goal is to have this completed by March and ready to tune. I'm going to try to be as detailed as I can on this swap for the benefit of others, and I don't want this to be just another dead end thread within this forum (or another forum) with a severe lack of information. Anyway, Lets get this started.......

I have chosen to do this swap using as much Mazda stuff as I can. So this means everything from the transmission back. But I "WILL NOT" be using the Aisin 6 Speed, this transmission is made of glass and I don't need that drama in my life. SO....... What is the next logical step, The JDM 5 Speed Rx8 Gear Box (R Box). This is the EXACT gearbox that the FD Rx7 came with, with some minor difference's. Obviously the push clutch design and the tail housing is the 2 first noticeable differences. On the inside not much has changed with the exception of 5th gear. The FD Box had a 5th gear ratio of .719, the Rx8 Box is .806. Information can be found here : MAZDA RX-8 | ABA-SE3P / CBA-SE3P | September, 2008
If you are on a budget, and want as much strength and reliability as you can get, this is the way to go.

Picture of the gear box :


Last edited by RGT84; 10-21-2018 at 10:13 PM.
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Old 10-21-2018, 09:37 PM
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What I will be using to mate the engine to the gear box is an adapter/flywheel combo from PMC MotorSports out of Poland. It is designed to be used with a Automatic 1JZ Flex Plate behind the flywheel(Note, you will need the factory spacer that goes between the 1JZ crank and the flex plate). It will set you back about $900 Shipped, before UPS emails you and hits you up with another $40 in duty charges or they wont deliver your package. The clutch you have to use with this flywheel so far, is another European Special. I have been unable to find it this side of the pond. An interesting side note is that these self adjusting clutches can be rebuilt. No pictures of the clutch yet as it is still between Poland and here (Pics to come). The clutch is from a BMW Diesel SACHS Self Adjusting Clutch Part # 3000-951-952. You have to buy the whole clutch just for the pressure plate as that is all you need. The stock throw out bearing and your choice of Mazda 1x23x240mm clutch disk can be used. I have chosen Comp Clutch Part # 381087-0620 6 Puck Rigid Ceramic. This setup should hold almost 600 Ft Lbs of Trq. The R Box will break before the clutch does


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Old 10-21-2018, 09:39 PM
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Old 10-21-2018, 10:30 PM
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I"ll get back to the Flywheel/Adapter/Clutch stuff when the actual clutch gets into my hands.

The engine is a 1JZ-GTE Non VVTi converted to single turbo. This engine is a front sump which will not work. Among other things that will not work, On the engine is a "Hunk O ****" Chinese turbo manifold that the previous owner decided to weld a T3 Flange on top of a T4. And it looks like PoOoO.........
I have all ready sourced the correct rear sump oil pan. This engine has 1000cc injectors and a Precision 6765




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Old 10-21-2018, 10:34 PM
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Forgive my nasty foot !
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Old 10-24-2018, 07:22 PM
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Just a quick update :

Just got the clutch in the mail today. Also my JZA80 motor mount brackets came in as well. Still waiting on some more parts, but for now, its back to taking the car apart.




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Old 10-24-2018, 07:32 PM
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Progress so far on the tear down :






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Old 10-24-2018, 07:44 PM
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cool good luck
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Old 11-12-2018, 08:24 AM
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Time for a little update. Got the engine and 6 speed transmission out, 5 speed transmission in, cut out the battery tray cross member and removed the majority of the wiring. Also went ahead and dropped the steering rack down as it needs to be relocated anyway.
Pictures of progress :




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Old 11-12-2018, 08:30 AM
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Getting 1JZ ready to install.

5 Speed R Box











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Old 11-12-2018, 01:19 PM
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The Steering and Suspension components needed came from Stephen @ LS1RX8 : More updates and pictures to come on this as I progress.

Oil Cooler : I will be using one of the factory Rx8 Oil Coolers in conjunction with a Circuit Sports Oil Filter Block with built in 180 degree T-Stat. The oil cooler I will be using will be the drivers side cooler as it is the closest to the oil filter assembly on the engine which would require the shortest length of hose to be used. Now the Rx8 oil coolers have built in thermostats, and there is no need to have a 180 degree T-Stat in the oil filter block and a 200 degree T-Stat in the oil cooler. I have gutted the thermostat and blocked off the bypass port in the factory Rx8 cooler. If anyone would like a detailed "how to" on this just let me know, and I will make a new thread on bypassing the oil cooler thermostats. Its pretty simple.
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Old 12-05-2018, 03:04 PM
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Everything is looking real good. The 1JZ may be one of the most underrated engines and can rev damn near as high as the 13b-MSP engine with twice the torque.
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Old 12-05-2018, 03:19 PM
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Originally Posted by strokercharged95gt View Post
Everything is looking real good. The 1JZ may be one of the most underrated engines and can rev damn near as high as the 13b-MSP engine with twice the torque.
I agree. I will have some more updates and pictures coming soon. Everything has been real slow rolling due to the holidays and waiting on parts. I have run into a slight annoyance (To Me Anyway). Now that the engine is bolted in place permanently, I have found that the Rx8 5 Speeds shifter is not offset to the left like the Aisin 6 Speed is. So even though the transmission is in the exact position, the shifter does not sit dead center in the car. It sits about 3/4-1in to the passenger side. So shifting through the gears 1-4 are just fine, but shifting into 5th, Your hand will foul out on the Emergency Brake preventing you shifting into 5th unless, you use the palm of your hand to put it in 5th. The only explanation i can think of is, since this tranny was only in a RHD car, Mazda just said F it, good enough. Because sitting in the passenger seat and shifting it from there, you never notice.
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Old 12-05-2018, 05:57 PM
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I think you may be overthinking it. I have the 5-speed and my 5th gear gets about 1 inch away from the emergency brake when shifting, but rests about 1.5 inches away once in gear. I'm sure my hand scrapes against that lever every time I go into 5th, but I have never literally given it a second though until just now..... I didn't even know there was a difference... Damn You!

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Old 12-05-2018, 06:17 PM
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Originally Posted by strokercharged95gt View Post
I think you may be overthinking it. I have the 5-speed and my 5th gear gets about 1 inch away from the emergency brake when shifting, but rests about 1.5 inches away once in gear. I'm sure my hand scrapes against that lever every time I go into 5th, but I have never literally given it a second though until just now..... I didn't even know there was a difference... Damn You!

Sorry lol. But yes there is clearly a difference. Its just one of those things that once you see, you cant un-see.

The picture of the 5 speed isnt as good but you get the picture.



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Old 12-05-2018, 06:24 PM
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Im sure there is a real fancy extended length short throw FD3S shifter that would fix the issue, but I have bigger and better things to worry about at the moment than the shifter. It will probably be the last thing i worry about, like, once I start driving it again and it starts to annoy the **** out of me.
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