smotch789

I'm interested in doing a SR20DET swap in 2005 6 speed manual.
Pros:
- Able 350-400 w.h.p. bolt ons
-Keep steering in tact
-Fittable fit in with little modification engine bay and frame.
-Transmission and gearing while different able to swap in 3.91 RX7. Able to use SR20DET manual transmission still cheaper than Ford 8.8 swap.
swap.
Cons:
-Wiring probably have to go with Megasqurit
-Lack of support
-Design most of the mounts myself
-Custome piping and routing
I understand some people prefer the rotary engine and I think it's cool concept. I just thinking of different path. Thank you for any input.

Fijibluefg2

RGT84

Personally, Id use Adaptronic Modular PNP. It is a can bus ECU ( Yes there are other CAN BUS ecu's out there not sure what is involved to get them to work) and everything works like factory once installed.

I hope you have better luck than i had trying to find a 3.9 Automatic Rx7 ring and pinion. I had to settle for a 4.1 5 Speed Rx7 ring and pinion.

Im not sure how the transmission of choice is going to affect you having to spend $ on a ford 8.8 swap, because they make PPF Delete kits for the stock rx8 differential. The stock diff is more than capable of holding whatever a Sr20 is going to throw it. Axles are the weakest link back there.

Keeping the stock steering intact is going to at the very least involve buying a kit to drop the rack, bump steer kit and rear sump oil pan whether one is available or custom.

And just a little info here, there are many cars out there that have the Aisin AZ6 Transmission ( S2000, Miata, Rx8, Sr20, Altezza, The FRS and BRZ have a similar tranny but it is to far removed to swap parts from). That being said, If you were to buy a 6 speed version of the Sr20, you can just swap tail housings and shift linkages Between the rx8/Sr20 trannys (Maybe a few more small parts) and it will just bolt right to the rx8 PPF which just leaves you with the motor mounts and other things i mentioned earlier (Providing there isnt anything on the back of the Sr20 head to foul out on the firewall.) I had played around with swapping a Renesis in a NB Miata with the AZ6 and the parts swapping works. And the Sr20's exhaust is on the opposite side, so there is that to deal

Kelvin Batista

Hey Guys,

I am currently doing this swap, it was relatively easy in sense the motor fits with little modifications to the chassis, I was able to use source an s15 6-speed trains that share the similar (Aisin AZ6 Transmission ) internals which allowed me to swap the rx8 tailshafts with the s15 one which allowed me to bolt the trans right up. Just as@RGT84 had mentioned. you are able to retain the stock steering rack by just dropping the rack approx 3in down. I am currently using an FC rx7 throttle pedal and should bolt up with little modification to the steering column grommet. I am currently working on wiring it all up. I am trying to do my best to document the process to provide a detailed HOW TO.

TeamRX8

iTrader: (25)

yeah, well this still applies in either case

TeamRX8

iTrader: (25)

the 3.909 r&p is still sold through Auto Craft Evolution. It’s typically around $950.

.

John V

iTrader: (1)

I'm kind of surprised to see people bothering with an ancient engine like the SR20 when more modern, powerful, cheaper alternatives exist within the Mazda family. But I'm biased

TeamRX8

iTrader: (25)

Seems like a much easier swap than your own without all the chopping/massaging/fabrication mods, but that transmission is a pretty weak link. A gearset could resolve most of that, but it’s probably $5,500 installed. It doesn’t require any custom fitment/installation based on what they’re saying though.

John V

iTrader: (1)

I don't like the sound of this "drop the steering rack a few inches" though it sounds like it's largely the same as mine. Custom mounts, different trans, etc. Nothing rocket sciencey

TeamRX8

iTrader: (25)

Well you’re probably right, I overlooked that thinking more of the firewall and drivetrain stuff. I suppose we’ll get a better idea once the information is posted. Looking forward to seeing more.

John V

iTrader: (1)

95% of these swap threads end up going nowhere when people come to the realization that it's a lot of work and money no matter how you slice it, but I'm interested in seeing how it develops as well.

Chrishoky

iTrader: (9)

Considering the OP never commented on this thread in over a year tells you how they pretty much go.

TeamRX8

iTrader: (25)

see post #4, somebody else picked up the torch and ran with it