ST185 ECU 'unlocking" for 18psi?

J

Jason88AllTrac

New member
A friend of mine works for Toyota out in CA. He says he met a guy who worked as the FPE specialist for the ST185.
He said that some of the ECU's could be "unlocked" to run 18PSI maps by soldering a few things on the board. This was used for racing classes that required a stock ECU.

He said he was going to send me information as soon as he did the modification to a 1990 all trac ECU and put it in his MR2.

Does anybody know about this, or should I be thinking he's full of it?

Thanks,
Jason
 
athousandleaves

athousandleaves

New member
Quite possible and very interesting but I can imagine that this would require more than a simple point-point soldering of a chip on board.

You would probably need another ROM that has the maps to fuel the car properly up to 18 psi properly - not to mention all the other things.

I'm very interested in this though so keep me posted!
 
athousandleaves

athousandleaves

New member
iirc, the RC ECU is good to about 17.4psi before you fuel cut...
Also there are some other topics con the boards about unlocking our ECU on a regular 185 to get up to 16psi.
~correction~
90-91 ECU's are good to 12.5psi before fuel cut

92-93 ECU's are good to 15psi before fuel cut

RC ECU's are good to 17.5psi before fuel cut

Although I have read that all kouki ecu's are set for 17.5...

In my USDM 92 I ran 14psi quite comfortably last summer and never hit the cut.
 
B

built2run

New member
orrrrrr u could just do away with fuel cut as sometimes the conditions are right enough to fail the engine as its cutting fuel. had it happen on my first block =( in a split second man
 
M

Mattyno

New member
Hi, I have forged engine and I installed CS Unit (89661-2B320) My friend also had a CS with a forged engine and ECU were 3 modes. Changing the position of a jumper on the HDD in the PC changing FC. The last is,''setting rally, in which the blown turbo 21PSI. I have a question, do you know what unit may have a number? It was only for Japan?

Thanks for answers.
 
C

celicat93

New member
I was talking with a professor who works in my department at the U of I who has a 93 turbo MR2 that he bought new. He told me that he was at a car show back then that featured a one off special edition that had special specs and from what he described to me, it sounded like what we do with the FCD and a boost controller, achieving about 240hp. I would think if there were anymore "secret, hidden mods" in the 3SGTE, they would have pulled them all out with that demo car.
 
athousandleaves

athousandleaves

New member
DudeMan":1kkvzu3w said:
athousandleaves":1kkvzu3w said:
90-91 ECU's are good to 12.5psi before fuel cut
Click to expand...
Kinda off topic but I've gotten to 17 psi in my 1990 and never hit fuel cut.. :shrug:
Click to expand...

Is your car a Canadian delivered 185 or a JDM import?
I was closing in on 18 psi when I last drove my car and blew out the turbo to manifold gasket but didn't hit fuel cut either.

I should just pull my ECU and run it on my workbench through different simulated psi ranges until I see fuel cut kick in.
 
D

DudeMan

New member
Canadian model.

I think I'm going to disconnect the turbo pressure sensor and use the vacuum port for my BOV instead.
 
K

klue

New member
You dont need to "unlock" anything. The ecu has no idea what pressure its seeing. The turbo pressure sensor is solely used for boost cut. Weather is 5 psi or 20 the AFM does the fuel calculation anything over like 14 psi its squirting as much fuel as it can. Just hope it dont blow :p
 
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