spitfire7

i know it sounds strange to some of u guys with all the auto to 5speed swaps, but i like the feel of the auto 3rd gen. have any of u guys rode in a auto 3rd gen, it reminds me of riding in a grand national, constant turbo pull in between the shifts feels great. i tried it once unsucessfully with an s5 auto before i knew about all of the differences between s4 and s5 fc's. i was told that the motor that i was buing was an s5 but it was an s4. when i put it together the s4 t2 motor harness didnt work with the s5 cpu. so i had to change the car to a 5speed and all of the wiring to s4 to get the motor to work in the car. i know that i could have went witha fuel management system but i didnt have the cash for that at the time. so now i know how to make my dream 7, buy a motor, harness, and computer, either s4 or s5, then buy an auto fc either s4 or s5, get either a t2 diff or a 5speed gxl diff sence theyre both posi. get the auto tranny rebuilt to hold the extra hp, and ill be in the game. so what do u guys think. ill be faster than some of u guys t2, just wanted to share that with yall. lata.....

classicauto

iTrader: (3)

sounds good....

you shuold be able to use a cosmo auto tranny - many guys when swapping in 20b's will bolt the TII 5speed tranny up the motor....I would therefore assume that with the cosmo's drive plate on your 13b, the cosmo trans should bolt up - granted a custom driveshaft is more than likely in order, but that would be hugely less expensive then having an FC auto built to handle big HP...

Good luck with the project...question though.

Is this just because? or are you plannign on dragging the car and don't want to put up with the slight delays when shifting a stick vs. a nice tight auto?

Juiceh

iTrader: (4)

IMHO the best thing to do would be to get a Jspec FC3S auto tranny. All Jspec FC3S were turbos so an auto tranny off one of those I would trust much more than an NA auto! I imagine it would bolt up with no issues. I believe corksport might even have one. PM Japan2LA and see if he has any too.

The cosmo tranny will probably be a bitch to get working with the electronics.

spitfire7

yes the cosmo tranny will fit but ill have to get an electrical expert to figure out how to get that tranny to work with the tranny computer, flywheel, drive shaft ect..., i know that i cant afford all that. and no im not going to be draggin the car. when its all done ill drag it to see what it does. i just want it to be a nice street car that i could drive a few times a week. rotating between an s14 that i want to sr20 after im done with the fc project.

spitfire7

the only thing about the j-spec auto tranny is gettin the wireing done. i want to spend as less as possable with the best results. thats why im going stock beefed up stock rebuilt tranny that will be functional with the chassis auto computer.

classicauto

iTrader: (3)

right...damn electronics

spitfire7

it dosnt really have to be the fastest 7 though. ill get a 3'' intake pipe that ill hide under the airbox, if im lucky ill get a street ported motor ,but if its not ported ill get R&R Rotary to j-bridge a motor for me, atkins racing seals, i would like a fmic, downpipe, 3'' exhaust to a single oval canister to quite it down a little. i think ill have about 275-300 to the wheels, i really dont know but it will be fast as f..k though.

TonyTurboII

Might be hard to find a worthwhile Torque converter though.

Realize also, to the wheels, cars with auto trannys lose more power than manual equipped cars.

Im doing about 300 to the flywheel, which is good for a low low 13 or a high 12.

ramello

iTrader: (1)

been there done that....
i had an auto GXL that i converted over to a turbo
i put the engine in first before i had all the parts for the drive line conversion to make it into a 5 spd

heres the problems......
the ECU for a turbo has no connection for the electronic transmission control box which tells the car when to shift.....
also the torque converter couldnt handle the power of the turbo kicking in....

so basically the car would only shift based on momentum or when the car reached 5,000 rpm or more, however since it couldnt handle the power you couldnt go more than half throttle.....
this took a long time to reach 5,000 rpm and forget about going uphill

now this was an 89 GXL and i swapped in an S4 turbo
i believe the S4's didnt have the electronic control for the tranny
so it may work if u find an S4 auto tranny but you may want to find a jspec tranny and controller and possibly if there is a different ECU used in the jspec auto turbos

so while it seems like a good idea to swap the auto tranny in its a lot of work to make it compatible and it doesnt work llike normal

spitfire7

well i would be using the the stock torque converter, and wouldnt mind loosing a little low end torque on the bottem end, thats why i keep my idle at 1500 rpms. after its moving it'll be cool....... Ramello i tried to do it that way also, and like u said it dosent work. thats why im starting with the motor, then buing an auto 7 thats the same series as the motor, then all of the metering connectors will connect and the interior harness will connect to the computer. but u didnt do what im tring to do. u planned on doing a turbo and a 5speed swap, and then found out that the t2 computer would not accept the interior chassis harness. nor would the metering connectors. if u would have bought an s5 motor u would not have had those problems. with the same series motor as the car u dont have to go with a fuel manage system or have to change the whole car to an s4. which one did u do. thanks for the replies.

ramello

iTrader: (1)

i actually put in an S4 harness so there was no problems with that....the problem was not with any metering connections hooking up....
the problem is there is a seperate box mounted under the carpet but up to the right more in the area of the fender inside an automatic car....it controls the shifting in the automatic transmission.......
there is a short harness that plugs from this computer to the actual ECU
so when you have a turbo ecu there is no where for this to plug into
so without that plugging into the ECU to get a signal on the load of the engine and tranny the only way it shifts is to reach 5,000 rpms
but as i mentioned this is hard without going past half throttle, once past half throttle the car will bog down since the tranny wont handle the power

you would also defnitly have to go to a GXL rear end, and in doing so you need a new drive shaft and rear axels as well.......
this is because the connections on the rear end are smaller on the gxl and the turbo axels wont mount up nor will the drive shaft

classicauto

iTrader: (3)

by the sounds of his experience you're going to NEED to use a J-spec auto tranny and computer...if that will even hold together at the 300bhp level...

oh and I love this - hehe

LMAO

spitfire7

to get my last 7 to run i had to use a gxl wire harnesses, and yeah it worked fine also. now i remember that it was no plug that would go to the tranny comp, damn. so if i do that project i would have to find an expert to complete that project. or find a t2 auto tranny, tranny computer, and an auto t2 harness and computer. whats the chance of me finding an auto front clip. thanks.

spitfire7

i think i might be able to use the na motor harness from an auto 7. im gonna check on this.

TonyTurboII

Doubt it, Theyre not the same.

cdaleracer669

iTrader: (1)

some people run the NA harness with the turbo conversion. i think there is a couple things to address tho. and cant u run an NA ecu with an aftermarket knock box? just throwing out some idea, i dont have any experience with it.

spitfire7

i know that they are not the same, but its not alot that has to be hooked up, injector plugs are not the same ill just use the connector plugs from a t2 harness, it will have no emissions so thats stuff wont be hooked up. well one of my friends works for R&RRotary so ill holler at him to go the process.