My rx-3 project
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My rx-3 project
Contemplating starting my rx-3 project. I've been doing some research, articles and threads here on the rx-7 club forum. I have a good amount of experience working on cars but almost none on rotaries. I have a 1973 rx-3 purchased a few years ago. It had a TII in it at one time. No motor now. TII trans still in place. I have a S5 TII engine that I would like to swap in. I think that the previous owner of the car had the TII motor mounted in the car by using a front cover off of an older car. So for mounting the engine I am considering 3 options.
1) GSL SE front cover. Looking at the S5 motor appears that the turbo oil drain back is in the front cover. Also S5 utilizes a electronic OMP. So these issues would have to be overcome. Any suggestions would be appreciated.
2)Modifying the S5 front cover, welding bosses to bolt the motor mount.
3)Making a custom cross member to P/U S5/S4 FC mounts, I did own a rx3 project that was set up this way, although I never saw an engine in it. Looking at it might not be enough room to clear steering linkage.
I have read differing accounts of what oil pan would work. Someone at one of local rotary shops told me that I need a old school 13b oil pan or an aftermarket. Also GSLSE? So far the rest of my plan as it is. Use stock S5 wiring harness and ECU eliminating unused circuits. Modify stock gas tank to accept the S5 fuel pump and sender. Any helpful info would be appreciated.
1) GSL SE front cover. Looking at the S5 motor appears that the turbo oil drain back is in the front cover. Also S5 utilizes a electronic OMP. So these issues would have to be overcome. Any suggestions would be appreciated.
2)Modifying the S5 front cover, welding bosses to bolt the motor mount.
3)Making a custom cross member to P/U S5/S4 FC mounts, I did own a rx3 project that was set up this way, although I never saw an engine in it. Looking at it might not be enough room to clear steering linkage.
I have read differing accounts of what oil pan would work. Someone at one of local rotary shops told me that I need a old school 13b oil pan or an aftermarket. Also GSLSE? So far the rest of my plan as it is. Use stock S5 wiring harness and ECU eliminating unused circuits. Modify stock gas tank to accept the S5 fuel pump and sender. Any helpful info would be appreciated.
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Gsl-se front cover and oil pan is your best bet.you will have to modify the front cover for the turbo oil return line.if I were you I would run s4 stock Ecu instead of the s5,I hate the s5 just because it needs the electric omp hooked up or else it will go into limp mode and won't run.
You can use s5 Ecu but will need electric omp hooked up to the harness and tucked away somewhere on the car just so the Ecu is happy(only if you use gsl-se front cover).
What I do normally if running s5 motor is put gsl-se front cover and oil pan
Run all s4 electronics ,injectors,throttle body with TPS,water thermo sensor,afm,etc.
I get a s4 rx7 chassis harness and modify it to power up the Ecu,leading and trailing coils,and crank angle sensor.
I guess I'm just used to running the s4 turbo Ecu and works well for me,my 12a is running all s4 turbo components with hybrid stock turbo at 10 pounds off boost with no problems.
You can use s5 Ecu but will need electric omp hooked up to the harness and tucked away somewhere on the car just so the Ecu is happy(only if you use gsl-se front cover).
What I do normally if running s5 motor is put gsl-se front cover and oil pan
Run all s4 electronics ,injectors,throttle body with TPS,water thermo sensor,afm,etc.
I get a s4 rx7 chassis harness and modify it to power up the Ecu,leading and trailing coils,and crank angle sensor.
I guess I'm just used to running the s4 turbo Ecu and works well for me,my 12a is running all s4 turbo components with hybrid stock turbo at 10 pounds off boost with no problems.
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I agree 67 cleaner look, no side marker lights, although sidemarkers are a good safety feature. No, I did sell that one. This is another one that I've had for awhile.
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very nice project
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GSL-SE front cover and oil pan. have someone weld a bung on it for oil return. or drill and tap and use thread sealant.
s5 motors have the good rear iron, i have an s4 in my rx3. i went standalone on my rx3 so no reccomendatins on ecus from me.
got any pics of the trans tunnel? did they hack it up for the TII trans?
you have a good jump on the swap thats for sure.
s5 motors have the good rear iron, i have an s4 in my rx3. i went standalone on my rx3 so no reccomendatins on ecus from me.
got any pics of the trans tunnel? did they hack it up for the TII trans?
you have a good jump on the swap thats for sure.
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Started doing some work again
I've been doing some work on the old mazda recently. My goal for now is just to get it running. Maybe kinda "rat rod" style. Mechanically sound but cosmetically as it is.
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13bt
I going to try to chronicle the build on here. This is my first Mazda project. Pulled from my TII. Ive got a gsl se front cover and oil pan. I was thinking about this universal no weld for the turbo oil return.
Also the omp can I adapt a s4 or gsl se omp? I know that I have to keep the s5 omp wired into the harness.
Also the omp can I adapt a s4 or gsl se omp? I know that I have to keep the s5 omp wired into the harness.
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Brakes
I'm thinking brakes, stock for now. I made this because I did not have anyone around to help me bleed. It works. The booster holds vacuum. Callipers are stuck. Brake disks are not available but they look ok. I think i'll just bead blast the rust off and run em. I think I'll run a gsl se master( cause I have one already), after market adjustable proportioning valve. I'm also thinking that might get braided steel brake lines made up.
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Cool, thanks for the info. I've been looking at your build threads for ideas. How do you do your turbo oil return lines? Drill and tap timing cover for AN/NPT adapter?