RX7 Part 1 title picture

Project [Rotary] FD RX-7:  Part 1 - Regenesis

By M-P Spierer

The 3rd generation Mazda RX-7, often simply referred to as the FD from its chassis code FD3S, is a world renowned platform for both street cars and race cars alike. Combine its weight, suspension geometry, driving position, and power potential and you have a 100% performance oriented machine. While it has become popular over the past decade to ditch the rotary engine and replace it with Chevrolet LS V8 as seen with our very own Project V8 RX-7, this project vows to keep it real with the triangles!.

Now a reliable, turbo, rotary powered, track car may sound like an oxymoron of epic proportions, it can be done however, and that is what we aim to do. This is technically the second time building this car and it is truly a new build due to how much is changing. On the list of engine upgrades for this project include an entirely new turbo setup, engine management, ignition and fuel systems, auxiliary injection, and much more. Beyond the engine, the suspension, brakes, wheels/tires, and chassis are going to be reworked as well.

Previous Engine Setup
The original engine setup that was installed in this RX-7 would have been a great setup in the early 2000's, but the turbo, ignition, fuel, and engine management options of today are far superior. The HKS R-Type v-mount intercooler is a different story though and is the crowned jewel of the car in its current state. Purchased before the dollar-to-yen exchange rate started to decline in 2007, these are now hard to come by and cost a pretty penny.

The engine components used in the original build of this RX-7 are fairly standard in the world of single turbo RX-7's, so it was by no means a terrible build, however, nearly every area of the original build can be improved upon in some major way. Listed below are a handful of aftermarket parts included in the previous build that are on the chopping block for the first several articles.

- Garrett T04Z ball bearing turbo
- Tial 46mm wastegate
- Apex'i Power FC and FC-Datalogit
- Bosch 1680cc secondary injectors and KG fuel rail
- Greddy Profec-B boost controller and various gauges 

Bare EngineThe engine itself is another component that is not changing for the time being. It only has a few thousand miles on it and features a custom large street port, upgraded 2mm apex seals, an Atkins thermal pellet, and Viton oil control O-rings.


Interior oldThe interior of the car from the previous build is changing as well. This is the last time anyone will see these gauges, boost controller, Power FC commander, or steering wheel mounted in this RX-7.
Page 1 of 5 Next Page
Bookmark and Share
Wednesday, July 24, 2013 2:55 AM
Looks like the oversized water pump pulley wouldn't have fit with the new crank trigger wheel.

Is that a factory steering wheel for USDM FD FX7's.... it's beyond ugly :)
Dan DeRosia
Dan DeRosialink
Wednesday, July 24, 2013 3:56 AM
Looking forwards to seeing where this all goes. Been a rotorhead for quite a while myself, though never done a turbo one.
Wednesday, July 24, 2013 5:36 AM
Damn you guys. FDV8 was one thing but bring out another RX7 just takes the cake. Really looking forward to this.
EB Turbo
EB Turbolink
Wednesday, July 24, 2013 7:39 AM
The stock FD trigger wheel has 12+1 teeth. For crank triggers more is not always better. Some lower end and even some higher end systems have poor internal resolution. They will have a hard time interpolating between teeth and it will result in timing drift. If the trigger wheel is not engineered correctly you will run into many more pickup issues than just timing drift.

EB Turbo
Wednesday, July 24, 2013 9:18 AM
No power steering pump?
Also thank you for finally building a rotary, I hope Eric has a lot of input on this.
Wednesday, July 24, 2013 9:22 AM
180sx0: I cannot truly comment on this because I never fit it up in that way, but I can say that the trigger wheel and pulley are not in the same plane and "shouldn't" interfere. However, if they didn't interfere the clearance would probably still be too close for comfort.

EB Turbo: Not sure why I was thinking the factory trigger wheel was 10+1...guess I had 10 stuck in my head and just went with it. Anyway, it is now corrected. Thanks.

pistonhead: Yes, the power steering rack has been converted by Maval to be a true non-power steering unit (no looped lines or anything like that).
Dan DeRosia
Dan DeRosialink
Wednesday, July 24, 2013 4:59 PM
So what're you thinking about in terms of turbos? Last I was poking around and thinking of building a turbo 13B, something like the Borg Warner S362 (or 8875 or however you care to call it) or S300 with the FMW sounded fun in a bang/buck sense and should be a pretty darned good replacement for the T04Z. Lots of other options too though, including EFRs.
Wednesday, July 24, 2013 6:34 PM
Right on the money...FMW just looked too perfect for the 13B and for the money. Expect to see the details on the whole turbo system in part 3.
Dan DeRosia
Dan DeRosialink
Wednesday, July 24, 2013 6:47 PM
Hah, cool. Will look forwards to it all then. This is really making me want an FD, I have to say - it's probably not happening, but I can still want things. But a nice semi-peripheral with a medium sized turbo in an FB could be fun too.
Thursday, July 25, 2013 3:27 PM
20 years later, the FD still looks sexy and modern. I'm glad you're doing a proper build of this chassis. Can't wait to see what MotoIQ does.
Sunday, July 28, 2013 10:22 PM
I concur about it's framework..I am just truly envious about it's design..It is merely remarkable..

sell car
Sunday, April 09, 2017 2:12 PM
I had some questions about the whole fuel set up on the engine side. Who should I contact? Looking to run the same exact set up.
Post Comment Login or register to post a comment.

MotoIQ Proudly Presents Our Partners:

© 2018 MotoIQ.com