Auto 3S shifting on it's own., New ECU did the trick. Options

[WannabeGT4]

My car is shifting on it's own now. I installed a new 5S ECU for the transmission this morning and took it for a spin and everything worked... 1, 2, D, OD. I'm still not 100% sure what went wrong with my stock ECU but it probably has something to do with my uncle "helping" the day I made the bracket for the ECUs.

The shift points seem higher than they were stock for some reason. I assume it's because of the different igniter. This is fine with me though the 3S power band is higher than the 5S anyway.
EDIT: Now that I think about it, this was probably due to my jubilation causing me to keep the gas pedal mashed to the floor.

When I was trying to get my stock ECU to work I connected more signal lines to the ECU than are probably needed, so I'll more than likely try removing as many wires going to the 2nd ECU as possible and see what the bare minimum is to make this work.

Funny thing is it took me all of 20 seconds to plug this thing in and I've had the new ECU since the beginning of the year... Talk about procrastination.

This post has been edited by WannabeGT4: Jun 16, 2007 - 1:41 PM

[Culpable04]

congrats man !

you did it.

now show us some videos so we can see your creation in action

[WannabeGT4]

I'll try and get some vids up in the next couple days.

[Batman722]

glad to see you got it shifting properly.

BTW, how's the mileage now ?

[WannabeGT4]

glad to see you got it shifting properly.

BTW, how's the mileage now ?

Thanks.

Do you mean MPG or miles since swap? MPG I'm not sure about now since I just put the ECU in this morning but it was right at 20mpg before. Miles since swap is just under 3000 I think.

[Supersprynt]

probably due to my jubilation

[devilsden97]

your using the stock S54 tranny correct?

whats your Guess on hp currently?

edit: i checked your profile after writing the stuff above.

your profile states: "Stock A140E automatic transmission"

is that the tranny code for the 5sfe auto trans?

edit II: I have a bunch of questions...lol

Are u using a higher weight auto tranny oil?

Do u have AOL Instant Messanger? If you do, send me a message, id really like to talk to you about some stuff.

S/n: devilsden97

This post has been edited by devilsden97: Jun 16, 2007 - 6:49 PM

[jgreening]

congrats Justin. Now get a decent intercooler.

[WannabeGT4]

your using the stock S54 tranny correct?

whats your Guess on hp currently?

edit: i checked your profile after writing the stuff above.

your profile states: "Stock A140E automatic transmission"

is that the tranny code for the 5sfe auto trans?

edit II: I have a bunch of questions...lol

Are u using a higher weight auto tranny oil?

Do u have AOL Instant Messanger? If you do, send me a message, id really like to talk to you about some stuff.

S/n: devilsden97

The A140E is the code for the GT's automatic transmission.

I'm using cheap Autozone transmission fluid. I'll probably switch to a better brand in the future.

Any questions you have go ahead and post them here. It'll be better for anyone else that's looking for this info later on.

congrats Justin. Now get a decent intercooler.

Thanks Jay.
I got a decent intercooler... ST205. I just need to find time to install it.

[trd94]

soo.... you have a auto 3sgte swap right. that is kind of cool i would love to see it . glad to see it working and keep us posted.

[devilsden97]

When your at full boost, what is it?

When do u reach full boost?

Without driving "spiritedly" are u on boost regularly or off boost?

How many miles are on your tranny?

[WannabeGT4]

When your at full boost, what is it?

I'm at waste gate pressure for the time being 6-7psi

When do u reach full boost?

not sure really... maybe around 3000 rpm. It seemed sooner when I had an open DP.

Without driving "spiritedly" are u on boost regularly or off boost?

mostly on boost during acceleration. virtually no boost when cruising.

How many miles are on your tranny?

over 100,000.

[devilsden97]

When your at full boost, what is it?

I'm at waste gate pressure for the time being 6-7psi

Do you precieve there to be any problems by say doubling your current boost? Many memebers here run 12 and 14 psi (some daily) on there 3s and 5s swaps with Manual transmissions. From your expierience thus far what do u think?

Without driving "spiritedly" are u on boost regularly or off boost?

mostly on boost during acceleration. virtually no boost when cruising.

Have u ran the car with o/d off, so u have Higher RPm or manual shifted your automatic to push it into the higher RPMs therefore prolonging boost.

also, as you drive the car while in Drive, do you go on and off boost when shifting from one gear to another. (the question i guess is, when do u initally start to create boost? If you start at 2500rpm to create boost, and u go from 2ndgear at 3500rpm down to around 2000rpm into 3rd gear, you'd drop out of boost then have to respool.)

This post has been edited by devilsden97: Jun 17, 2007 - 3:15 PM

[lagos]

get this idea out of your head migga! lol

[WannabeGT4]

When your at full boost, what is it?

I'm at waste gate pressure for the time being 6-7psi

Do you perceive there to be any problems by say doubling your current boost? Many members here run 12 and 14 psi (some daily) on there 3s and 5s swaps with Manual transmissions. From your experience thus far what do u think?

Only time will tell. I don't notice any slipping right now, just the up shifts are a little sluggish. Even if I don't have problems it doesn't mean the next person won't. Turbo auto 6th gens just aren't common enough to say for sure.

Without driving "spiritedly" are u on boost regularly or off boost?

mostly on boost during acceleration. virtually no boost when cruising.

Have u ran the car with o/d off, so u have Higher RPM or manual shifted your automatic to push it into the higher RPMs therefore prolonging boost.
also, as you drive the car while in Drive, do you go on and off boost when shifting from one gear to another. (the question i guess is, when do u initially start to create boost? If you start at 2500rpm to create boost, and u go from 2ndgear at 3500rpm down to around 2000rpm into 3rd gear, you'd drop out of boost then have to respool.)

It runs fine with the OD off, just as you'd expect. Shifting 1,2,D also works great.

Boost is all determined by your throttle. If you've got the pedal to the floor the shift point will be high enough that you won't drop out of boost in the next gear. If you're babying it you'll build minimum boost and the shift point will be low enough that it will have to build boost again in the next gear.

get this idea out of your head migga! lol

If you're seriously considering this migga, you had better be 100% sure that this is what you want. I did it for comfort as this is my daily driver and because so many people doubted it was possible. What are your reasons for considering it?

[devilsden97]

^im half batting it around in my head. but im also interested because i really dont think ANYONE else has done this besides u, and ideas that are "out of the box" kinda excite me, and get my interest.

[lagos]

its been done before by the 5th gen guys. from what i remember, they reported that the trans slipped under boost.

[WannabeGT4]

its been done before by the 5th gen guys. from what i remember, they reported that the trans slipped under boost.

I remember hearing about one guy with a fifth gen doing it but I never found who it was or any proof that it actually happened.

[lagos]

werd

[ILuvMyCelica95]

get this idea out of your head migga! lol

^ i'm with Art. You dont need any power, crazy migga