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TDI Conversions Discussions on converting non TDIs into TDIS. More general items can be answered better in other sections. This is ideal for issues that don't have an overlap and are very special to swaping engines.

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Old September 11th, 2017, 17:31   #1
nztdi1
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Join Date: Mar 2015
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Default Rx8?

Hi everyone

Has anyone by chance completed/looked into a 4 cyl tdi swap into a mazda rx8? They are coming up more often with sick engines now. Saw mention of one on another forum but no real info. Have not looked at depth into the viability but I know older rx7 swaps have been done. Have a spare jeep ax15 adapter so was wondering if a 2wd version of this gearbox might work, likely with a rear end swap. Any input would be greatly appreciated

Thanks!
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Old September 11th, 2017, 19:29   #2
Bobob729
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I did a 2jz in a RX-8 that made 743 to the wheels so anything can be done. I can tell u it will fit but there is a lot of wiring that is involved and u have to make new mounts for engine and tranny. Also the diff would need a front mount to hold it up correctly due to how it it held up originally. It also has electronic steering. Which is controlled by can bus through the stock ecu so u need to keep that and add a extra trigger wheel to the crank to make gauges and steering work correctly as well
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Old September 11th, 2017, 19:31   #3
Bobob729
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There's alot that is involved in it but it definitely could be done the other issue u would come to would be the siphon system in the fuel tank. But you could use a 4 motion setup and it would probably work fine as well
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Old September 11th, 2017, 19:55   #4
nztdi1
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Did you use the stock gearbox? Would I be missing any required sensors by swapping it out?

Last edited by nztdi1; September 11th, 2017 at 19:59.
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Old September 11th, 2017, 19:57   #5
nztdi1
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Have read about a potential 3.73 swap from an 80's mazda but would likely need much higher gears ae there any bolt in options or would I need to custom fit something else?
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Old September 11th, 2017, 20:14   #6
Bobob729
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I put a Ford 8.8 irs in mine. But it wasn't cheap to do they do make a kit though and no I used a 300zx transmission with a adapter plate.
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Old September 11th, 2017, 20:24   #7
nztdi1
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Gotcha, no issues losing the Mazda gearbox? Sounding like it might be viable could be a fun little commuter
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Old September 11th, 2017, 21:12   #8
Bobob729
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I didn't but I also didn't keep the stock gauges. Everything I did was custom. But there have been people swapping in lsx or 2jz as well that haven't had any issue this is just my experience honestly if u like the car I think it wouldn't be a horrible swap. Between the rotary and the Tdi there close the the same size and possibly weight
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