rx7lover222

ok so im in the process of taking my 12a out and putting in a gsl-se motor. im having a mechanic help me but my ? is what do i all need now that im going to have a 13b? i know the front cover gets transferred, but do i need a 13b radiator, wiring harness, etc... any info on the 12a to gsl-se 13b swap will help! thanks a ton, tim

Jeezus

iTrader: (4)

The radiator no. Engine harness, ECU, complete intake, engine.

rx7lover222

so i can use my 12a radiator? n yes it comes with the ecu. by the way is there anyway to use the 12a tranny with the gsl-se engine?

Crit

iTrader: (6)

If you still have access to the old GSL-SE, the front crossmember would be a great thing to have. For an SE engine, you don't have to move front covers, as yours is already front-mount. The radiator can stay, and the 12A tranny will bolt up to it fine. You'll need to slot the engine mount bracket and the crossmember at the engine mounts, or perhaps bend the bracket a bit. If you're gonna keep the original setup, you should have a front-mount oil cooler below a short 3-row radiator, which will cool the GSL-SE engine fine. The only issue is that the engine will be close to the radiator once the radiator's reinstalled, but you can either be very careful with the fan selection or pick up a thin electric fan.

rx7lover222

ok awesome, so i can use my 12a radiator or have to be a gsl-se one?

justint5387

iTrader: (1)

Yes, you can

Crit

iTrader: (6)

The SE radiator would just buy you some extra clearance at the water pump pulley over the 82 radiator you've got. For the S3 (84-85) cars, they had to find a thinner radiator for the GSL-SE variant, because the engine came forward an extra 20mm. The solution was to make the radiator taller and thinner, keeping roughly the same cooling capacity but giving up the real estate used by the older oil cooler. In response to that, they invented the beehive oil cooler for 12As that goes below the oil filter. Apparently they weren't willing to put a beehive on the GSL-SE (maybe because of the heater line to the throttle body, maybe for cooling capacity for the bigger engine), so they then hung an oil cooler ahead of the radiator, somewhat similar to the original design, which you've got. That's why all those things changed for 84.

If you can deal with the clearance, you can keep the thicker, shorter stock radiator and hang the oil cooler below it like you're used to. Keeps things simple, but I'm not sure the stock fan will fit on the nose of the waterpump anymore. I know that the thin Taurus e-fan will fit, and there are others. Maybe someone else knows if the stock fan will clear or not.

Rx-7Doctor

iTrader: (13)

The radiator used with the stock fan will have no clearance issues.

If you want to use an electric fan then you will need to find one that is thinner so that the motor portion of the fan does not hit the water pump pulley and does not interfere with the lower accessory pulley if you have A/C.

Since you have a 82 model you just use your existing oil cooler and hoses to bolt up to the 13b.


There have been many threads on this swap below is just one example.

https://www.rx7club.com/forum/showth...light=13b+swap

mazdaverx713b

iTrader: (91)

i have recently done this swap and this may help. the parts that you need are as follows:

-complete SE wiring harness
-SE fuel pump and mounting bracket
-new fuel feed and return lines
-stock 83-85 radiator
-SE oil cooler
-SE fuel filter with banjo bolts and bracket
-7/16 fuel hard line off of the tank
-SE fuel tank
-ACV relay
-hard plastic inlet duct ahead of the radiator
-SE oil cooler and lines
-SE exhaust center section
-SE ecu
-SE water hose from heater core to the left side of the engine block
-switching solenoid valve, releif soleniod valve, and well as the vaccum switch
-SE air box and maf
-notched engien crossmember to accomidate the 13B (allows the engine to properly sit farther back)
-SE air box mounting brackets
-relief silencer
-5ht/6th port actuating tube

this is my thread regarding the swap:
https://www.rx7club.com/1st-gen-general-discussion-207/finally-got-my-l6-project-796342/

Crit

iTrader: (6)

If you're planning to use the stock EFI setup from the GSL-SE, then you'll need mazdave13B's list of stuff, including the passenger's side radiator support, which has a large hole cut in it to feed the stock air cleaner. Like we said, you can get by the with old radiator and oil cooler. The rest of the list (wiring harness, AFM and airbox, fuel rail and injectors, intake manifolds and plenum, hardlines, pump, fuel tank, etc) will still be necessary.

If you're planning to use a carb setup, then you only need to source an intake manifold and carb, adjustable fuel pressure regulator (different carbs will run at different pressures) and you'll need to add a packpressure sensing tube and stock lower intake manifold if you want to use the aux ports. If not, you can remove the aux port sleeves and run the Holley 6-port manifold from Racing Beat.

mazdaverx713b

iTrader: (91)

i also forgot to add that you will need:

-SE throttle cable
-Main relay pack
- i had to shape my left side radiator support to accomidate the oil cooler lines. with that said you may need one of those as well
-SE overflow tank and cap

twinkletoes

iTrader: (17)

Just throw a carb on it, way easier

rx7lover222

ok thanks everyone. i have alot of work ahead of me. im pretty sure most of the stuff mentioned that i need will already be on the motor though becuase the motor im buying is fully complete

mazdaverx713b

iTrader: (91)

its the little parts that will get you. remember that you will need to completely remove the dash and swap in the SE harness. the harness is actually 3 different sections. you will retain your current heater controls.

rx7lover222

i have the complete gsl-se motor, ecu, wiring harness. and 12a tranny. i also have my 12a oil cooler and radiator. so now when i bring it to the mechanic will he have everything or will i need anything else to buy before he puts it in?

mazdaverx713b

iTrader: (91)

in addition to the parts you laready have, you will need the following:

-SE fuel pump and mounting bracket
-new fuel feed and return lines
-SE fuel filter with banjo bolts and bracket
-7/16 fuel hard line off of the tank
-SE fuel tank
-ACV relay
-hard plastic inlet duct ahead of the radiator
-SE exhaust center section
-SE water hose from heater core to the left side of the engine block
-switching solenoid valve, releif soleniod valve, and well as the vaccum switch
-SE air box and maf
-notched engine crossmember to accomidate the 13B (allows the engine to properly sit farther back)
-SE air box mounting brackets
-relief silencer
-5th/6th port actuating tube
-SE throttle cable
-Main relay pack
- i had to shape my left side radiator support to accomidate the oil cooler lines. with that said you may need one of those as well
-SE overflow tank and cap

rx7lover222

im getting a complete motor im pretty sure that all would come on a complete gsl-se motor. anything i should look to get besides whats probably on the motor?

mazdaverx713b

iTrader: (91)

see my above post. you will need that list to convert a 12A powered RX-7 over to a 13B EGI powerd 7.