94 R2 N/A 3 Rotor Build
11-02-11, 11:10 AM
#1
94 R2 N/A 3 Rotor Build
This is a project of mine that has been in the works for, well years now actually. So.. for a bit of background history. I bought my first Rx-7 at 16, a 86 GXL. Joined the forum shortly after. Didnt take long for me to develop a passion and appreciation for Rx7s and rotaries in general. Through the years, as most of us do, I started accumulating more cars and parts, as well as modifying the ones I owned. At one point I had a bit of a small "side business" buying/fixing/selling FCs, etc. As with anyone I suppose in their late teens/early 20s, I was bitten by the power bug and had huge plans for my FC. It had a massive, laggy T70 turbo, Haltech, Kaaz rear, etc etc.. Went to a few local track days, got some experience with some other cars and over time started to develop an appreciation for a smooth and well balanced machine, as opposed to just a power monster. Having friends with cars ranging from supercharged Z06s and camaros, to big block muscle cars, I was fortunate enough to get a bit of a feel for alot of things. A few years passed, and I ended up selling my FCs, and bought my FD in May of 2005. a BB 94 R2, which aside from an exhaust and a set of springs was bone stock. I fell in love with RX7s all over again, and to this day still see my FD as something Ill keep forever. I did some light mods, and enjoyed it like that for a while. Unfortunately road debris one day took out my oil pan without me knowing, and loss of oil pressure led to not happy bearings. That was about.. Im guessing 5 years ago now. As with all things, what could have been a simple fix or replacement snowballed into a huge project. I went back and forth on everything from LSx swap to BNRs, and just couldnt make up my mind.
As the car sat in the garage, I happened to purchase an S2000 for a DD. Oddly enough, this car is what made me make up my mind on what engine to swap into the FD. I absolutely loved my S2k. While a bit anemic in a straight line, the balance and feel of the car was superb. The linear acceleration and flat torque (torque...haha) curve of the car, with its 9k rpm 2.0 and 6 speed was just a joy to drive. I dont think Ive had a car before that I had so much fun in. They really are excellent cars. I wanted that same feeling in my FD, just perhaps taken to the next level. So, after reading all that, that is where this brings me now. My FD is undergoing a complete rebuild. Engine, chassis, everything. In the past year or so Ive pretty much had every nut and bolt off the car, and there is very little left that has not been replaced with new or upgraded. The end vision I have always had for the car, I always tell myself is a "budget" 911 GT3 RS. I dont necessarily have a "power goal", but shooting for 375RWP. That in a well balance chassis and ~2600lbs should make for a very exciting and fun car. I want it to be at home on the track, but have a bit of refinement and be able to be driven on the street. I have alot of pics so far, and in the next few days will be uploading as I have time. For now here is a basic list of all that is being completed:
Engine
3Rotor being built by Logan at Defined Autoworks
Rx-8 10:1 Rotors, large street port. Custom built header and Exhaust
Custom ITB Intake
Full drysump oil system with Mazdaspeed front cover
Electromotive Tec3R ECU
Drivetrain
G-force T5, build with helical gearset and dog ring engagement (synchro-less)
Mustang Cobra 8.8 IRS with ford racing 4.3 gears
Chassis/Suspension
AME TM02 wheels 18x9.5 +22 on all 4
Dunlop Star spec 255/35r18s
RacingBrake 4 Corner BBK
Zeal Function Xs Coilovers
Full Superpro Bushing replacement
Rotary Extreme Toe links/Trailing Arms
Tanabe F and R Antisway bars
Raceshop 4Pt Rollbar
ATL 13Gallon Fuel Cell
Manual Steering conversion by Chips Motorsports
This project has been in the works for some time now. I feel lucky enough to be able to do this at all, but Im not made of money so its been slow going. I didnt want to start a thread 2 years ago that dragged on forever, but now there is light at the end of the tunnel. Shooting for a completion sometime this coming summer.
As the car sat in the garage, I happened to purchase an S2000 for a DD. Oddly enough, this car is what made me make up my mind on what engine to swap into the FD. I absolutely loved my S2k. While a bit anemic in a straight line, the balance and feel of the car was superb. The linear acceleration and flat torque (torque...haha) curve of the car, with its 9k rpm 2.0 and 6 speed was just a joy to drive. I dont think Ive had a car before that I had so much fun in. They really are excellent cars. I wanted that same feeling in my FD, just perhaps taken to the next level. So, after reading all that, that is where this brings me now. My FD is undergoing a complete rebuild. Engine, chassis, everything. In the past year or so Ive pretty much had every nut and bolt off the car, and there is very little left that has not been replaced with new or upgraded. The end vision I have always had for the car, I always tell myself is a "budget" 911 GT3 RS. I dont necessarily have a "power goal", but shooting for 375RWP. That in a well balance chassis and ~2600lbs should make for a very exciting and fun car. I want it to be at home on the track, but have a bit of refinement and be able to be driven on the street. I have alot of pics so far, and in the next few days will be uploading as I have time. For now here is a basic list of all that is being completed:
Engine
3Rotor being built by Logan at Defined Autoworks
Rx-8 10:1 Rotors, large street port. Custom built header and Exhaust
Custom ITB Intake
Full drysump oil system with Mazdaspeed front cover
Electromotive Tec3R ECU
Drivetrain
G-force T5, build with helical gearset and dog ring engagement (synchro-less)
Mustang Cobra 8.8 IRS with ford racing 4.3 gears
Chassis/Suspension
AME TM02 wheels 18x9.5 +22 on all 4
Dunlop Star spec 255/35r18s
RacingBrake 4 Corner BBK
Zeal Function Xs Coilovers
Full Superpro Bushing replacement
Rotary Extreme Toe links/Trailing Arms
Tanabe F and R Antisway bars
Raceshop 4Pt Rollbar
ATL 13Gallon Fuel Cell
Manual Steering conversion by Chips Motorsports
This project has been in the works for some time now. I feel lucky enough to be able to do this at all, but Im not made of money so its been slow going. I didnt want to start a thread 2 years ago that dragged on forever, but now there is light at the end of the tunnel. Shooting for a completion sometime this coming summer.
11-02-11, 11:41 AM
#3
A few "Progress" Pics. First is the original engine pull, back in my old tiny garage
I had to replace my front core support. This just after I welded the new part in
Rear fender rolling. The fronts are shine autos OEM oversize fenders. Cant even tell theyre not factory but have a bit more clearance
I had to replace my front core support. This just after I welded the new part in
Rear fender rolling. The fronts are shine autos OEM oversize fenders. Cant even tell theyre not factory but have a bit more clearance
11-02-11, 01:42 PM
#5
I have them just mocked up right now loosely and the fit seems pretty good so far. May need a bit of adjustment, the drivers one seems to be a bit higher back by the windshield and where it flows into the door, but I haven't spent alot of time fitting them to find out what needs done. The quality is nice, and as I said you really cant tell they arent oem. Ive been focusing alot on other parts of the build so getting all the panels back on precisely is still some time away.
11-02-11, 04:25 PM
#7
Also, were the Rx-8 10:1 rotors a recommendation by Logan? Or something you requested. I am curious to see how they do compared to the old FC NA rotors in terms of power. I understand they're a higher comp ratio, I guess I just haven't seen many people going this route. Definitely interested to see how it goes 
That Mazdaspeed front cover is a nice piece too!
That Mazdaspeed front cover is a nice piece too!
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11-02-11, 05:25 PM
#8
The 10:1 rx-8 rotors were my request. Logan didn't seem to have a problem with them as far as reliability or engine longevity, but neither of us are really sure if there will be any power gain. I'm a bit nervous of them myself, as I know they are for the most part untested, and in some instances actually lost power. They are something I wanted to experiment with, and I'm hoping since we are building a custom intake and exhaust setups we can tune it to optimize whatever different resonances there may be with these vs the fc rotors.
Also, were the Rx-8 10:1 rotors a recommendation by Logan? Or something you requested. I am curious to see how they do compared to the old FC NA rotors in terms of power. I understand they're a higher comp ratio, I guess I just haven't seen many people going this route. Definitely interested to see how it goes
That Mazdaspeed front cover is a nice piece too!
That Mazdaspeed front cover is a nice piece too!
11-05-11, 03:54 PM
#11
Subscribed. N/A 3 rotor ftw. I would have gone that route if parts, etc. weren't so damn expensive and I had to experiment so much, not to mention CA emissions B.S. we have to deal with out here. Badass concept and car, look forward to seeing it running. Please post pics and vids. Lots of them
EDIT: how do you plan on mounting the cobra 8.8? Not sure if you know, but Justin Samberg on norotors.com makes a cradle for it.... I highly recommend him as all of my mounting stuff for the lsx swap was from him.. he's a great fabricator and very good with customer service.
http://www.norotors.com/index.php?topic=126.0
You may have to be a member to view pics. I'll post them here in case you can't see them.
mounting kit:
diff cover mod:
EDIT: how do you plan on mounting the cobra 8.8? Not sure if you know, but Justin Samberg on norotors.com makes a cradle for it.... I highly recommend him as all of my mounting stuff for the lsx swap was from him.. he's a great fabricator and very good with customer service.
http://www.norotors.com/index.php?topic=126.0
You may have to be a member to view pics. I'll post them here in case you can't see them.
mounting kit:
diff cover mod:
11-05-11, 06:20 PM
#12
I already have the Cobra IRS mounted. Well, I did then I pulled it back out to get some stuff powdercoated. I am using one of the first cradles from Jimlab. I am also using a LPW rear diff cover, which gives me a bit of extra capacity, as well as allows you to brace the bearing caps. Picture of that below:
11-13-11, 07:26 PM
#15
Didnt have that much time to do anything this weekend. I did get my new improved racing swaybar endlinks in, so threw them in the rear. Also dropped the front subframe and steering rack back in, and started putting the suspension pieces back together. Drivers side mostly complete, also a mock up of my brake ducts. Theyll need slightly modified to fit correctly.
03-12-12, 11:14 AM
#18
Been a while since an update. Dont have a whole lot to show picture wise, but some work was done. Got all the suspension/brakes back in the car, and for the first time in years the car hit the ground as a roller. I trailer-ed the car off to DefinedAutoworks over the weekend. So hopefully soon I will be able to update some more.
Off she goes:
Dropped off at Defined. Its the first time Ive ever taken any of my cars somewhere for work, much less my FD. But Im confident shes in good hands, and sometimes you need to know your own limitations
My Engine:
Off she goes:
Dropped off at Defined. Its the first time Ive ever taken any of my cars somewhere for work, much less my FD. But Im confident shes in good hands, and sometimes you need to know your own limitations
My Engine:
03-13-12, 03:13 PM
#20
wow wonderfull car, im in progress of a similair build but still tossing and finding out about lots of things.
Like what come's to it when drysumping the 20b.
and stuff about the drivetrain setup.
I keep my eyes on ur's in the meanwhile!
Keep us posted
thanks.
Like what come's to it when drysumping the 20b.
and stuff about the drivetrain setup.
I keep my eyes on ur's in the meanwhile!
Keep us posted
thanks.
03-13-12, 06:17 PM
#22
There's a few reasons why I decided to stay side port. Mainly, I want this engine to last a long time, and as we all know rpms can be an engine killer, and you need to do alot to prep for the 10k+ rpm to take full advantage of them. My engine is pretty much capable of that anyway, but sticking with a powerband that maxes out in the 8500-9k rpm range should provide all the power I need, and prove reliable for many years to come.
