therotaryrocket

Im trying to put my S4 n/a engine into my 83 gs 12a. i know i need gsl-se oil pan, my old 12a front cover (because the engine mounts are on it?), I have a N326 ecu but no harness except a few wires coming off of my long block engine but there just connectors like the o2 sensor, or the fuel injector harness connectors so no harness. I read it was possible to make my own consisting of like 10-12 wires(any details?)? , well also i'm gonna weld a straight pipe from the 13b exhaust manifold up to the factory pipe skipping out all the cats. My gas tank on the 83 right now is kinda clogged because the fuel filter clogs up every like 500 miles full of black ****. I previously removed my gas tank and had a shop soak it in boiling 'cotsqik soda' or something like that overnight, but although the gas can now keep up with the carburetor at crusing speeds if I redline from a stop in 1st, 2nd, when i get to 3rd it bogs down and sometimes stalls out becuase the float bowls of the carburetor are empty from the clogged tank. anyways what about a gsl-se tank? i know where one is from a junkyard but then i want to like dip it then seal it or something(any suggestions).
okay, what did i leave out? damn i didn't mean to make this so long, i did alot of searching but some questions are left unanswered like the harness one.
thanks, zach

therotaryrocket

bump, can anyone help me? i've searched a lot and am still doing so but need some help.

therotaryrocket

muthafuka, i need help!haha come-on no input? n e one done this swap?

therotaryrocket

btw, i just drove a 2005 mazda rx-8 with only 1525 miles on it. my friend let me take it out for like half an hour. that **** is fast, and the intake manifold has like valves that change the velocity of the intake air by changing the lengths of the manifold runners or somtin(like 5th and 6th ports on the gsl-se or fc) . i can feel it switch on at like 4k rpm? and it starts whistling kinda, then 7k feels like another valve switches or some ****. then 9,500 rpms is pretty fukin loud to be all stock. i read an aftermarket intake system produced 90dB decibels from inside the cabin of the vehicle with windows up and doors closed. that is like autocross limit i think.

FB II

you have an 88 TII and think the rx8 is fast??? whats wrong with your FC!!! hahahah, as for your original questions:

WIRING: the main reason for having the harness is because you need the injector clips, grounds, triggers from cas, etc... in theory wiring it up yourself could be done, but you better read that FSM front to back about 30 times

edit: why not get a stand alone ???

FUEL TANK: a gsl-se tank is better overall because of it's sump/baffle around the pickup, but if it's not any cleaner inside than your current one you will still be at a loss. if the one on your car now was soaked or whatnot, they must not have done a good job. if you have that much sediment in there then it needs to be done again/ the proper way. most radiator shops can do it right the first time

custom13B

Zach FB2 is right. Save yourself hours of headaches and buy a NA harness on ebay. I bought one for 35 or 40 bucks last winter. You'll still need the FSM though as theres sure to be a few connections youll need to trace down. I did a 1987 NA 6 port 13B into my 1982 FB last winter and it really was'nt too difficult. I then (stoopid me) made it difficult by adding a cartech turbo kit. I went with the GSL-SE tank and again I back up FB2's write up the sump is way better. Almost any bosch pump will fit right into the stock GSL-SE fuel pump tray. I would not suggest bypassing all 3 cats unless you get a racing beat muffler even then I would suggest a racing beat pre silencer. And dont even think of removing the heat shields. If you do you'll have problems. If you bypass those cats you will not believe how loud and annoying the car will be! Absolutely forget about any female company in that car...yea there that loud! If you shop around you can get a used RB pre silencer they dont wear out. Trust me on the exhaust I've been down that road. Hope this helped.

therotaryrocket

okay, well i'll get a gsl-se tank then. so everything else i said was right? what exactly needs to happen to the motor mounts? notch them? i plan in the future to get a megasquirt and tune my way to 30+ mpg but for now i want to use the factory ecu since i already got one, well i guess the only other thing I need is the engine wiring harness from the passenger side that goes thru the firewall from a s4 n/a, and it is my understanding that no modifications are need to that harness but on the drivers side with the ignition some **** is gonna go down. i read the article in the archives that tells what wires to modify. well i guess my only question now is where is a link to a walk-thru. i still feel kinda in the blue. parts i have:
s4 n/a long block, N326 ecu (s4 n/a?), 12a front cover, re-using the 12a's clutch temporarily, Parts i need:
gsl-se oil pan, gsl-se gas tank with sending unit using my turbo II pump (but wat about a filter set-up?is it in the same place gsl-se and 12a?), s4 n/a wiring harness, i think i'll also need an fc oil cooler, straight pipe.
well, did i miss anything? thanks

therotaryrocket

custom13b, what problems did you run in to during the conversion, is the harness plug and play aside from the ignition side?

custom13B

Zach,
The GSL-SE tank uses a external pump. Check ebay for a deal on a inline bosch unit. Just be sure to wire in a relay to power it. The GSL-SE tank has a internal filter of decent quality but be sure to install another just before the electric pump. Get a universal metal style ..I believe mine is a Kinsler with stainless steel mesh filter screen inside 20.00 I believe it was. Check Canton racing or summit. The harness will mostly be plug n play except there will be a few wires you wont have a use for...ex the shift light etc etc. I'm confused about the oil cooler...did the 12A not have one?

custom13B

On that harness I did have to wire in a few ralays as the FB wasnt injected. Check junk yards and get the main fuse panel for the fuel injection and youll see it has 5 or 6 high amp fuses. You will need a FSM no matter how much you research this. TRying to help tho as I did get frustrated afew times during my conversion.

custom13B

I ended up making my own motor mounts out of solid alluminum. I'm sure you could reuse the 12a ones and add shims if needed..use thick washers or whatever. The solid mounts I've had no trouble with but they do cause a lil more vibration. I am converting to megasquirt now and will be selling that harness on ebay sometime soon.

therotaryrocket

how would i make my own motor mount? what kinda relays would you need to add? could i just use the fc fuse block? oh yea, is your car like really fast? got any numbers? or pics? im pretty excited about mine. thanks, zach

Rotor13B

Dude just notch the 12a crossmember wider.

therotaryrocket

okay. another question to add, i have the s4 n/a transmission also available or can reuse the old 12a tranny. what changes are needed to use the s4 trans. which driveshaft will be used?

sjd

I'm in the middle of the same swap, to use the S4 tranny swap over the tailshaft from the 12A tranny so the shifter will line up and use the 12A driveshaft. Or just use the 12A tranny and driveshaft. I know there is info on the different ratios between the two somewhere but I know they are pretty close. I'm using the S4 tranny since my 12A was an automatic.