ST185 ECU 'unlocking" for 18psi?

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ST185 ECU 'unlocking" for 18psi?

Postby Jason88AllTrac » Wed Mar 30, 2011 9:14 pm

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
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Re: ST185 ECU 'unlocking" for 18psi?

Postby athousandleaves » Wed Mar 30, 2011 10:56 pm

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!
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Re: ST185 ECU 'unlocking" for 18psi?

Postby celicat93 » Thu Mar 31, 2011 3:30 am

:evil:
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Re: ST185 ECU 'unlocking" for 18psi?

Postby MrDB » Thu Mar 31, 2011 8:49 am

Its well documented that the ecu doesnt have the maps inside to accuratly map to 18psi. so the mod will only if anything replicate a FCD ( fuel cut defender )..

Stock ecus are being hacked again though as we speak....

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Re: ST185 ECU 'unlocking" for 18psi?

Postby athousandleaves » Thu Mar 31, 2011 12:32 pm

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.
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Re: ST185 ECU 'unlocking" for 18psi?

Postby built2run » Sat Apr 02, 2011 4:27 am

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
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Re: ST185 ECU 'unlocking" for 18psi?

Postby Mattyno » Wed Jan 25, 2012 6:51 am

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.
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Re: ST185 ECU 'unlocking" for 18psi?

Postby celicat93 » Wed Jan 25, 2012 6:34 pm

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.
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Re: ST185 ECU 'unlocking" for 18psi?

Postby DudeMan » Wed Jan 25, 2012 7:17 pm

athousandleaves wrote:90-91 ECU's are good to 12.5psi before fuel cut


Kinda off topic but I've gotten to 17 psi in my 1990 and never hit fuel cut.. :shrug:
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Re: ST185 ECU 'unlocking" for 18psi?

Postby athousandleaves » Wed Jan 25, 2012 7:42 pm

DudeMan wrote:
athousandleaves wrote:90-91 ECU's are good to 12.5psi before fuel cut
Kinda off topic but I've gotten to 17 psi in my 1990 and never hit fuel cut.. :shrug:


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.
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Re: ST185 ECU 'unlocking" for 18psi?

Postby DudeMan » Wed Jan 25, 2012 9:46 pm

Canadian model.

I think I'm going to disconnect the turbo pressure sensor and use the vacuum port for my BOV instead.
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Re: ST185 ECU 'unlocking" for 18psi?

Postby klue » Thu Jan 26, 2012 3:27 am

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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Re: ST185 ECU 'unlocking" for 18psi?

Postby tubasteve » Fri Feb 03, 2012 3:11 am

I've noticed lazy computers...run 16 and no cut, on a cold night....it will cut at 12+
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Re: ST185 ECU 'unlocking" for 18psi?

Postby Corey » Fri Feb 03, 2012 3:28 am

My 89 JDM fuel cuts at 14Psi
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