Firetiger262

Hello, i have a 83 GS model RX7, its my first project car, and i have some questions i would like to have answered.
The 12A in my car is beat up and not really worth rebuilding, i would like to swap it out from a 13B Turbo from an FC, should i get the twin turbo or single, if i get the twin would i have to modify/get a new exhaust?
also i would like to know how difficult it would be to do such a swap, will i have to modify the mounting point very much?
and finally with the inter-cooler, should i try to set up a bottom mount or keep the top mount, and if i keep the top mount would I need a hood scoop or would i be fine with out one?
any help is appreciated, some of these might be newbie questions but like i said, this is my first time modifying a car and i would greatly appreciate your input/suggestions

Thank You

wankel=awesome

carb'd 6 port 13b imo. Extremely easy swap, probably more fun than the t2. And all the fuel injection and sensors and crap that none of my "fun" cars believe in.

FCinWV

iTrader: (8)

Unless you are a pretty seasoned rotary guy I wouldnt follow through with an REW swap ( the twin turbo setup ). If you are looking for a budget turbo swap, if there is such a mystical thing, your best bet is with a Turbo II swap ( the single).

In any case you will want/need a full custom exhaust end of story. As for the IC you could go with a fairly cheap front mount and do well. I would not run the stock IC for multiple reasons. At one time I built a pretty sweet setup for a reasonable price I could lead you through.

As for fuel management, you could run the stock harness from a turbo II and modify it for the fb chassis buutttt I almost gagged typing that. It wouldnt be fun, though its been done alot by the technical wizards here. A standalone such as an adaptronic 440 is an absolute GREAT option with GREAT tech support .

There also is the need for a gslse front cover, oil pan, and RB engine adapter bracket.

Then the obvious stuff. Fuel pump, rising rate FPR, BOV, IC piping, emissions block off plates, definitely EV14 injectors, Innovative wideband o2 sensor, and AEM Smart Coils are nice as well.

As long as you dont plan on tapping over 300hp the 12a tranny should be okay. However that damn one wheel peal rear end that GS has aint gonna like it. I say this because if you use a turbo2 tranny, you will have to have a driveshaft cut and balanced to fit.

This will all take some serious crafty workmanship. I too went through this phase. Now Im doing the same thing Wankel=Awesome just suggested.

Boost is in my veins bro, I LOVE IT. But its not too reliable and Ive had way more fun in a properly built na setup. Especially when it comes to controlling that go cart of a car in turns. Not to mention you can keep your drivetrain this way ( which is a **** load of money and headache upgrading in itself )

If you are set on a turbo swap, I am available to contact all the time to give advice where I can on proper components and setups.

Good Luck ! and Welcome!

Firetiger262

ok, you have convinced me to reconsider my plans, the main reason i wanted to swap to a GEN 2 13B is because they seem more abundant, im having trouble finding a good Rotary engine in my area and have resorted to looking for them on ebay, like i said im new to all of this, i have never swapped an engine before or anything like this, the reason i want a turbo is just because i have never had a turbo car before or even driven one, what would you suggest someone in my position do, i have saved up about $5000 for this project so far and would like to try and get the car running by the end of December, would it be easier to swap a N/A 13B out of a GSLE, my end goal is to try and get about 350HP, the main reason i dont want to put my 12A back together is because the housings are not in good shape and 13B parts seem to be a bit easier to get a hold of.

FCinWV

iTrader: (8)

You are correct. 13b parts are easier to find. No doubt that is the route to go. But its November 13th now. I dare to say its impossible to have a turbo efi setup running by the new year. After being used to the 12a then going to a 13b with bolt ons.... you will be in for a big surprise on how peppy they are. Remember, you dont necessarily need a gslse engine....just the front cover and oil pan.

With that being said. If you have saved near 5k, You could build one epic car. My suggestion is this. Try to find an S5 (89-92) engine or any 13b streetported. Something with low miles and from a reputable source. Get a weber or dellorto sidedraft carb and intake manifold.

From there a Racing beat full exhaust and a lightweight flywheel. You will need an automatic counterweight from the year engine you end up with. The ****** will rev like a street bike.

5 grand will go fast. What money is left over, spend on suspension.


Do this and you will essentially have the same build I am. You can see it by clicking the link in my signature.

Firetiger262

will i need to modify the engine bay in order to fit the 13B or will it fit with how it is now, my plan is once i have the engine im going to take about a week and a half to two weeks off of work on focus all of my attention on getting the car running because my free time will be cut in half after the new year, as suspension goes my brother in law has promised to get me a full set of racing beat shocks, ill get a set of slightly lowered springs, i don't want the car too low, but im also planing on getting a good set of brakes because my current ones are almost nonexistent, that and i was thinking of getting a pair of recaro bucket seats mainly because im 6 foot 7 and its a bit of a tight fit for me right now

FCinWV

iTrader: (8)

Nope it will fit just fine. For the engine to bolt up you need a gslse oil pan, gslse front cover, and racing beat front engine bracket which is on racingbeat.com. Also the proper 13b flywheel and clutch. Thats it.

FCinWV

iTrader: (8)

Oh, and gslse radiator hoses lol

Firetiger262

any suggestions on radiators? mine doesn't want to hold its coolant for too long

FCinWV

iTrader: (8)

Yep. I bought a ProTuningLab 3core. You can also buy their stainless shroud which comes with a quality e fan. I have about 270 dollars in it. Excellent quality.

Firetiger262

just had a quick look on eBay and found this, i would appreciate your opinion while i still have your attention
http://www.ebay.com/itm/JDM-Mazda-13B-RX7-FC3S-S5-Engine-5-Speed-Transmission-Rotary-Wiring-1-3L-/281496411177?pt=Motors_Car_Truck_Parts_Accessories&hash=item418a7e5c29&vxp=mtr

FCinWV

iTrader: (8)

Its been modified for sure. If u go that route take a compression tester with you and check that turbo for shaft play and beat up fins. Lots of videos on how to do all that. Keep in mind you will need an ignition and fuel management system for it. And a custom driveshaft +gsl rearend cause that gs rear wont handle it. Youll eat up that 5k building that setup.

Thats not necessarily the wrong way to go, but its the longer, tedious, money pit way which we all are lured to. Granted, it sure would be fun...

Firetiger262

so would it be better to try and find a different engine or one like this one, i was thinking of getting a gsl rear end anyway just so i could have disk brakes all around

FCinWV

iTrader: (8)

Yeepp.

Firetiger262

sorry that doesn't really answer my question, are you saying that an engine like this one would be good or if i should be looking for a different type?

Firetiger262

so after reading through the whole thread it seems like the best thing to do would be to get a S5 13B and go from there, mainly because it seems like there are very few 13B 6 port engines on the market currently that or im not looking in the right places

FCinWV

iTrader: (8)

An S5 is still a 6port engine. What separates an S4 and S5 is the S5 has higher compression rotors. Also S4s are 86-88 and S5s are 89-92.

4 port engines are mainly turbo engines. Except for gslse engines. They are 4 port as well.

And yes. That is the best option.

Firetiger262

ok thank you for the help, i just have a few more questions and i should be good for now, so if i get the S5 i believe they are fuel injected, so if i were to swap out the injectors for a carb would i still need a fuel management system? also when it comes to exhaust should i get a full set meant for an FB with a 13B or would i need to get something custom, or possibly mix and match parts from racing beat, and one last thing, i have been shopping around online and there are allot of S5 13BT engines but they are all imported from japan, if im not mistaken cars in japan are right hand drive while my FB is left hand drive, so im just curious if that will cause me any problems or not, thanks alot for the help

wankel=awesome

The GSLSE is actually an early 6 port, aux pods and all.

Firetiger262

also if i were to get the S5 could i still use my original wire harness or would i have to get a new one?

wankel=awesome

"S5" is only describing the series of engine. There's both S5 NA engines and S5 turbo engines. Which are you looking at?

Firetiger262

Well the turbo engines are much more abundant but I did find a custom NA S5 on craigslist it really depends on what is easier for me to get a hold of