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View Full Version : SR20DET into an FC3S Rx7, Progress at work!!

SRx7
02-28-2006, 01:47 PM
I am new to the nissan community, I have had this vision of putting a sr into an FC chasis. I am getting out of the rotary buisness cause I am sick of not being able to have a decently reliable car. I figure the sr20 would be an optimal choice to put into an fc because the rx7 will still mainatain a close 50/50 weight ratio and it will have good power to weight ratio. Plus not to mention it will be a reliable daily driven car cause its got a piston powered motor in it.

So far I have my rotary engine out of the car I just rebuilt, I sold the rotary engine and bought an SR20DET from a friend of mine. I need to get a wiring harness and I need a MAS, Igniter. Within the next couple of weeks I will be setting the motor into the FC chasis and see how everything sits. I will take the measurements and begin fabricating motor mounts out of 1/4 inch steel and a tranny mount. I am going to school right now for welding so thats not going to be a big problem. The only big problem I think I am gonna have is getting a custom driveline made. Its going to have to have the Sr20 5spd spline on one end and on the other end its going to have to have the yoke for the mazda rear end. And the only other problem I may have is mating the mazda vehicle harness up with the sr engine harness. But it shoudlnt be too difficult. I will need the pinouts of the sr's ECU and the pinouts of the mazda ECU. Basically the only thing its going to need is the ECU to have power to it and hook up all the other little things like RPM signal, Grounds, Etc.

Any suggestions or comments are greatly appreciated!
I will post follow ups as they occur.. (and I will post pics when I get some)

:newbie:
Yoshi
02-28-2006, 01:59 PM
Wow.

TriCities in da house! :D

Good luck man. That's A LOT of work ahead of you... make sure you document EVERYTHING. Keep a blog. If you're successful, others will look to you as a pioneer for more DIY goodness :D

IIRC, there are a couple of zilvia advertisers that carry custom shafts, w00t! hope you got a good wiring guy tho... ugh... that'll be a nightmare.
SRx7
02-28-2006, 02:42 PM
lol, yah, but nothing worthwhile is easy. I will be doing the wiring all myself. I really need to figure out what I am going to do for drivetrain tho..I thought maybe there could be a chance of putting the rear end and driveline of a 240sx in the rx7, but I havent got to that point yet. I will document everything and do my homework before I jump into anything I cant get myself out of.
Thanks again
trsilvias13
02-28-2006, 04:51 PM
there a guy here who got "bored" and did this. Marc

Edit:
http://www.zilvia.net/f/showthread.php?t=98757
its is in this 1st page scroll down a little. You may want to ask him for advice
aznpoopy
02-28-2006, 05:27 PM
someone did it way back in the day. it was a black FC with funky looking headlights. it was the panda FC team or something. found him on rx7club: name = initialD FC

http://www.rx7club.com/showthread.php?t=192335 (scroll to the bottom)

there was also a 500hp sr20det '93 FD rx7 on rx7club a while back.

http://www.rx7club.com/showthread.php?s=&threadid=241697

here's some useful info for you from that first thread:

I had to make my own motor mounts, and tranny mount, i moved the motor far back enough that the shifter fit into the stock location... i had to remove my heater though, i will replumb the one line around the motor before the winter hits , got a driveshaft made, and my buddy handled the wiring. its running on a stock ecu. most important was the custom aluminum oil pan and oil pickup. the pickup is right in the front of the motor which is where our steering rack/subframe is, so its either a new subframe, and move the steering rack forward or back 4-6" or the custom oil setup. Dry sump would work too... its a lil costly.

good luck with it! try sending him a pm. he might still be active on rx7club. he must have some good insight into the project.

edit: nevermind.. sold the car in '03 and started working for auto r&d. hasn't posted on 7club since.
http://www.rx7club.com/showthread.php?t=204583

maybe someone over at auto r&d could direct you to him. anyway, yeah. good luck.
wootwoot
02-28-2006, 08:25 PM
So you took a car that has no valve train at all and put a motor in that has a poorly designed one =P
Just wondering why you went with the sr? Many motors I would put it before an sr.
SRx7
02-28-2006, 10:52 PM
So you took a car that has no valve train at all and put a motor in that has a poorly designed one =P
Just wondering why you went with the sr? Many motors I would put it before an sr.
ur right on the poorly designed motor part, the reason I chose the sr is cause its relativly the same weight as the mazda 13bt, plus it makes good power which is comparable to the 13bt. oh yah, and last but not least, it will more than likely get me home at the end of the day and not break down on the side of the highway. Just curious, what other motors would you choose before you chose the sr to put into an fc?? :loco:
infinitexsound
03-01-2006, 12:24 AM
I am new to the nissan community, I have had this vision of putting a sr into an FC chasis. I am getting out of the rotary buisness cause I am sick of not being able to have a decently reliable car. I figure the sr20 would be an optimal choice to put into an fc




i want that in print!... signed and dated! JK..

sr's are good ka are good, any motor is just about good if its built and maintaned well... good luck on ur project..
Romeyo07
03-01-2006, 06:27 AM
Us puertorican's love rotarys....we'll make it work for ya.
jdms14_silvia
03-01-2006, 08:52 AM
if you get done with that by next month you should come to the Golden Gardens meet on March 25th..
wootwoot
03-01-2006, 01:44 PM
What motors would I put in one? What would I be doing with it?
If I was to drive it daily and track it I would put in a mildly ported renesis in it and not have any problems at all. I mean I dont know what you're planning on doing to the sr that is going in there, stock or what? I consider rotaries incredibly reliable if done right which many people do not do. But if i was to have a piston engine of my choice? Nissan qr25 or Honda f22c fully built shooting for around 350whp. 350whp can be done on stock turbo housing sizes though for ...
SRx7
03-02-2006, 01:54 PM
What motors would I put in one? What would I be doing with it?
If I was to drive it daily and track it I would put in a mildly ported renesis in it and not have any problems at all. I mean I dont know what you're planning on doing to the sr that is going in there, stock or what? I consider rotaries incredibly reliable if done right which many people do not do. But if i was to have a piston engine of my choice? Nissan qr25 or Honda f22c fully built shooting for around 350whp. 350whp can be done on stock turbo housing sizes though for ...
If I am not mistaken, both of those engines are from front wheel vehicles. What would be the point of using a front wheel drive engine in a rear wheel drive rx7. It would be harder to convert that rather than doing the SR in an FC.

lol, A front engine and front wheel drive rx7 would be useless, might as well buy a honda prelude or a nissan sentra.

:wtf:
ranisron
03-02-2006, 02:10 PM
I think the QR does come in majority in FWD based vehicles, but there are variants where QR is in trucks (RWD based vehicles).

F22C is Honda S2000 engine, so, RWD there you go.
Edgar
03-02-2006, 02:11 PM
I have some motor mounts at the shop that were going to be used on our FC SR swap.
wootwoot
03-02-2006, 03:35 PM
I think the QR does come in majority in FWD based vehicles, but there are variants where QR is in trucks (RWD based vehicles).

F22C is Honda S2000 engine, so, RWD there you go.


Bingo.

Dont have to be rude about it. I'm just trying to understand why an sr?
bigJ86
03-02-2006, 06:24 PM
hahaha.... funny no haters commented yet....... maybe becuase its a jap enigine and not a US engine...... if it was ls1(wich would make way more power stock and still keep it just about 50/50 weight ratio ) at least have every other post would be someone trying to hate......... but good luck.....
wootwoot
03-02-2006, 06:46 PM
I think the ls1 is a MUCH better option then the sr personally.
ranisron
03-02-2006, 07:59 PM
how about some 3TC motor?

You can boost that thing up and drive the piss out of it, and thing will still in tack.

Whatever the motor you use, build it right, and maintain it right, I am sure you will like the reliability.
Andrew Bohan
03-02-2006, 09:12 PM
if i had the money i'd put an LS7 crate motor in it. last i checked those were going for around $13k
EchoOfSilence
03-03-2006, 01:23 AM
a 3tc. wow i haven't heard of that in a WHILE. hahahaha.

+1 for you.
SRx7
03-03-2006, 11:55 AM
I have considered the ls1, but its a little out of my price range for my budget and what I want to do with the car. I feel the sr20det would be a good motor. I dont have an unlimited budget to buy brand new engines and such. Besides, I want to be one of the few that have an sr inside an rx7, not to mention I want to take pride in pulling something off that not many have done before. Plus the reaction people will have when they see a stock looking na rx7 going down the road, spooling up, blowing off. The reactions would be priceless...
AFSil80
03-03-2006, 01:08 PM
I forget where it was, but there was an LS1 swapped into an S14 zenki. The LS1 + aftermarket headers + tranny (I forget which type) weighed 167 lbs less than the KA and auto tranny that came out of the 240.

I'll try to dig it up.
SRx7
03-03-2006, 01:31 PM
I forget where it was, but there was an LS1 swapped into an S14 zenki. The LS1 + aftermarket headers + tranny (I forget which type) weighed 167 lbs less than the KA and auto tranny that came out of the 240.

I'll try to dig it up.
Thats bad ****ing ass, damn. :eek2: as much as I want to put an ls1 in I cant afford it, otherwise I would do it in a heartbeat!!