Ok, i am new to this forum, but not new to rx7s. I have a TII parts car with an S5 TII engine and i am looking for an S5 n/a car just to play around with. I would like some serious thoughts on why this idea will or will not work.

I want to tear down the turbo engine and an n/a engine, take the 9.7:1 rotars out of the n/a motor along with the counter weight and put them in the turbo engine. So that i would have a new 4 port high compression engine. I may do some mild porting but otherwise i am just going to run it with the s5 n/a computer running the sensors that i need and the omp and a holley carb on a RB intake mani for the time being. Later i might upgrade to a holley TB and a Microtech or something. Is there anything i am forgetting that would just make this not possible?

if your going through the trouble why not swap to a mechanical omp or premix so you dont need to keep the ecu?

well, ok what do i have to do to get rid of the computer? And if i wanted to leave it, will it run the omp, ignition, and all guages and sensors if i remove the TB and fuel injection? Do you have to get a 1st gen distributer to use a carb? I dont want to have to buy and wire up a buch of expensive autometer guages right off the bat if i dont have to, what would be the easiest/cheapest way to go about converting the car to a holley carb, reguardless of whether it was a hybrid engine or not?

Toss the computer, separate the wiper wiring and toss the engine harness too. Find an electronic distributor, wire it up- with 2 new coils, or go direct fire. The dizzy will give you better control of your spark timing.



Premix your fuel, its better than omp anyway.



Only gauges that dont work without the ecu is the water temp and the tach.



4 port is the way to go on a carbed N/A.

forgive my ignorance, but whats a "dizzy?"

I really like the stock ignition, it seems to do the trick pretty well. Plus its cheaper if it will work that way, i just want to know if it will?



I dont have a problem premixing, that doesnt bother me one bit. I wouldnt mind having the stock omp there just in case i screwed up or forgot, and maybe i wouldnt premix as much all the time. But i can premix, that doesnt bother me really either way.



Even if i wanted to just ditch the computer, doesnt the body harness plug into the computer? Will everything else in the car work if the harness is just unplugged?



I might go with aftermarket ignition later, but i would be more inclined to wait until i got all the fuel stuff worked out, whether i go EFI or carb. Basically i guess i just want to know if its possible to use the stock computer to run the ignition if it isnt controlling the fuel?

Dont know for myself how well it works. When I went carb, I used an electrinic distributor (dizzy, dist, ect.) right away.



The whole goal for me was to have full control, and better flow, without going to an EMS. Trying to keep the budget on my N/A low and still have fun with it.

Dizzy is just a short form of Distributor... From my knowledge and all my reasoning to call it a dizzy is because you get dizzy after watching the rotor spin round and round.. Hence, Dizzy

hahaha, well that sounds like a good explaination. I guess i should have been able to figure out what that was, but there are so many different names for fuel and ignition control systems i just wasnt sure it wasnt some sort of megasquirt for ignition control.



Ok, so is using the stock ignition and computer even an option or does anyone know?



So if i go with a distributer i just use one from a 1g?

If i used a dizzy and dropped the engine harness wouldnt i still need the computer so the body harness stuff would work? Or can it all just be unplugged from the computer and still work?



Even if a distributer would be better, i am still inclined to use the stock computer and engine harness for everything other than the FI just temporarily so that all i have to buy is the carb and intake. Then i can just swap the stuff out, adapt the throttle cable and once i get the air/fuel close i can drive the car again. I can just take a stock n/a car and basically just upgrade the intake side of things and in an afternoon be driving again. This summer sometime i can build the motor i have. I would just rather do things alittle bit at a time rather than have a car sitting in my garage while i figure out the little things that i forgot because i tried to do everything at once.

81 and up. The earlier ones were breaker points.

ok, so i found out that the stock computer will run the ignition without the EFI stuff or TPS so i am probably going to go that route at least at first.



I just want to say that i really like this forum so far, thank you to those who posted. On some of the other forums, the threads get way off topic and everything ends in a whole bunch of other people fighting over something that you dont care about. If you ask a question about a carb you are automaticlly stupid and want to go back in time 30 years or something like that. I actually dont know much about carbs and i am interested to learn alittle. Its really the most bang for my buck as far as i can tell right now, and i get to try something new.

thanks again