JDM ECU on Aus Spec 3SGE gen 1 - Toyota Nation Forum : Toyota Car and Truck Forums

trd_st162 · 12-08-2004, 06:45 AM

Hey everyone i'm a bit new here, i've got a 1986 Celica SX (probably known as the GTS over in other countries)

Now i'm in Australia and we got the 140PS version not the 160PS of the 3sge. Now i've heard that the JDM ecu are interchangable.. I have sourced one quite cheap, would there be much of a gain from using this jdm ecu? I heard the ignition timing is slightly difference (less retarted) and the fuel maps are slightly different again..

I just recently put on a Sports muffler (not a Cannon, just a nice decent redback muffler) and it seemed to have freed up the engine a tiny bit, it hasn't made a HUGE difference but i have to say that the engine isn't as hesitant to rev as much anymore... Anyone else noticed this?

Thanx again for your help everyone...
I'm going to be proud to say i'm part of Toyota Nation down in Melbourne!!!

JetspeedCamry · 12-10-2004, 07:29 AM

A free bump mate!

Come on guys...help him out.

Pineapple · 12-10-2004, 08:28 AM

Japan use 103+ octane gas that why they can get more power on the engine. Unless you can get at less that much octane gas, hot weather in Ausi will cause the engine to ping and knock to death.

dafunk_80 · 12-10-2004, 04:53 PM

Well, I'm pretty much an amateur, so if ya dont mind telling me, what IS a JDM ecu.. is that aftermarket preformance part? I know where my ecu is located, so If i change that over to this JDM one, will I get gains in performance?

And hey.. 103+ octance gas.. is that for real? And is that the norm? ANyone know what the norm is in Japan...

JetspeedCamry · 12-10-2004, 07:20 PM

JDM is the Japanese Domestic Market. Its not an aftermarke ECU. It a STANDARD ECU from factory. Japan used a slightly different ECU to compensate there conditions. It gives more power because of timing and mapping changes. We use the ADM ECU which is not what is actually called (its just called an ECU) but we refer to it as that because it was the one that came with the Australia cars. Too bad about that RON rating...is this true though? 103 is massive! Wish i was living in Japan!

trd_st162 · 12-11-2004, 01:08 AM

Hmmm that doesn't make sense because we have JDM engines in quite a few cars over here that are imported, like the JDM camrys (such as JETSPEED CAMRY) the 4age jdms found in toyota sprinters bought over here, they run optimax happily which is 98 ron.. Wouldn't that mean mine would be ok??
I don't think addin the ecu will need 103RON, all the other jdm engines in australia run no probs!

lcarocha · 12-11-2004, 10:15 AM

You can run the engine no problem it's just that the engine will be more prone to pinging and the ECU will have to retard or advance the timing every now and then rendering the benefits of the more agressive JDM ECUs maps useless

trd_st162 · 12-11-2004, 10:19 AM

Quote:

Originally Posted by lcarocha

You can run the engine no problem it's just that the engine will be more prone to pinging and the ECU will have to retard or advance the timing every now and then rendering the benefits of the more agressive JDM ECUs maps useless

Thanx sooo much for that response.... REckon there will be a bit of a performance increase?
I'm gettin one for about 90AUS. which is about $70US maybe a bit less???

lcarocha · 12-11-2004, 12:34 PM

Like I said, the pinging tolerances on the JDM ECU will be less forgiving than your regular ECU thus you won't be able to take full advantage of the more agressively mapped JDM ECU.

Have you checked that your car has all the same sensors and stuff the JDM ECU will need to work properly? I mean, your car may o may not have features that the JDM ECU would/wouldn't need imput from and if any was missing you would have the car running in "limp mode' because of some safety parameters programmed in the ECU.
i.e. JDM cars don't use a EGR valve, NADM cars do so if you tried to run a NADM ECU on a JDM car you would get fault codes because the EGR valve sensor is missing (this is just an example...!!!).

If I where you I would go with a piggy back ECU or an AFC controller or if you really have the money and know the right people then a full blown EMS would be my choice. As for the rest I would just leave things alone.

Pineapple · 12-11-2004, 12:35 PM

If you're looking for gain, not a good choice. The ECU retard timing and add fuel when it detect knocks and pings. The key here is it gotta to knock and ping first before the ECU do anything. You don't reakky want it to konck and ping at all.
You sure the other didn't do some fuel managment to get the engine to run?
Also some other may just don't know the different.
The car will run with JDM ECU but not at its best. Maybe you should get a piggy back and tune it. Much safer and your engine will last longer.

trd_st162 · 12-11-2004, 05:34 PM

Well yeah i put my timing up with jetspeedcamry the other day to 15 degrees so i thought now i have the best i can out of the ECU, i'm just trying to find some good worth it modifications...

I just got a redback muffler to free up the system a bit more, is it really worth doin the rest of the system? say extractors and around 2" piping?
Any other things that could be justifiable as modifications for a bit more bang for ur buck!

JetspeedCamry · 12-13-2004, 12:49 AM

Extractors and 2" piping will make it LOUD as...but very nice and free flowing. Maybe you could just try extractors?? What about a CAI and POD or some light headwork? Blockoff of the EGR??