1jzgte auto, piggy back ecu help

**celica77** · 17-10-2014, 04:08 PM

Quick question,

I currently have a 1JZ AUTO halfcut in my GZ20 Soarer, its my daily driver and has aircon the lot. I love that its auto and power everything.

Soon i plan to overhaul a few things to keep on top of her, I plan on getting the turbos rebuilt or possibly highflowed and the head brought back up to scratch. Its all good now but I believe from the previous owner its been about 10 years or so now.

I have played with aftermarket ECU's on manual transmissions before but wanted to ask if there is any options with keeping the 1JZ AUTO ECU in place but getting a small amount of control over fuel and timing etc but retain the standard shift points, I dont want to go to a manualised style Auto.

I was wondering if there was anyway around this? Ive heard about a piggyback ECU? but literally dont know much about them, From what I have read most of the gearboxes end up becomming manualised.

Its too much of a nice car to do that too, and if its too much of a head F, ill just get the turbos rebuilt with steel wheels and leave it as it, its still quick Just wanted to get a smidgen more out of it if possible without a full rewire and ECU change.

THoughts?

**lexsmaz** · 17-10-2014, 06:30 PM

Greddy has a piggy back ECU that you can run called a E-manage blue & would suffice for what you want, depending on what the engine came out of you might be lucky enough to get a plug in loom that plugs into your existing harness at the Factory ECU plug, otherwise you would need to splice a loom into suit & so you retain the original Factory ECU & all of its functions including the Auto so no change there at all & this Piggy back just fine tunes some of the parameters that you talk about, they are a good thing, but not cheap as far as the unit will cost you from 200 - 500 depending on wether new or second hand & then another 500 - $600 or so for tuning, if you are not running to much extra boost you might be able to just keep the standard computer & no piggy back, your call ..

I wouldn't go steel wheeled unless yours are shot as they make the car feel quite a bit laggier, the stock turbo's are good for around 15 or so PSI but the steel wheel turbo's can go a lot higher than that but you will lose around 500 plus rpm down low compared to the ceramic factory turbo's ..

**celica77** · 17-10-2014, 07:12 PM

Thanks for your reply, ill look into it more...
a bit of lag on them would be fine haha, I run 15 psi now and the response is just insane, a blip of the throttle and they make boost.

**Daddio** · 17-10-2014, 08:00 PM

Alternate is you can run a stand alone ecu with a SupraStick fully programmable ECU for the auto...

**celica77** · 17-10-2014, 08:13 PM

Yeah I am in no rush at all, just seeing what is possible. I defs dont want to end up with a manualised auto where i have to shift each gear, it needs to retain auto shift as its my clean daily car but have some tuneability. Appears a e420d or e440d adaptronic ECU might be up to the task. This is what they have said so far.

You can wire in an e420d or the e440d Select ECU into the factory harness with a loom. The e420d is a cut down version of e440d and its cut down in features are shown here - http://www.adaptronic.com.au/product/e420d/. It will be connected in piggyback mode with the factory ECU, but it will function as a standalone as it will have a total control of the engine - ie injection, ignition, idle, etc; while with the factory ECU still functioning to control the auto transmission.
The Adaptronic ECU is not an interceptor (other name for 'piggyback ECU' - which take signals from the sensors, modifies them and trick the factory ECU into reading a different value) in any way as it is a fully programmable one using a tuning software - http://www.adaptronic.com.au/downloads/

**Daddio** · 17-10-2014, 08:25 PM

SupraStick retains all the auto functions, but has programmable change points, customisable for high stall, etc....there's one in my cupboard

**Duk** · 17-10-2014, 09:26 PM

I can recommend the Emanage Ultimate interceptor tuner!

Very capable of doing lots of things, but most importantly, they intercept the injector signal and modify it to facilitate fuel tuning rather than trying to push and shove the main load sensor's signal. Ideal for upgraded injectors.

Failing that, go an Adaptronic to run the engine as mentioned.
Very capable ECU's! Adaptronic's latest firmware upgrade is pretty friggin amaising!
I think a second hand E420c is an absolute bargain!
I've got 2 of them ;-)

**lexsmaz** · 18-10-2014, 01:56 AM

Your call, but you mention you only want to adjust small increments & I have seen a lot of ECU's not done properly or are incapable of cold start idle, amongst other things where as the stock ECU is pretty impressive across the board & no doubt millions are probably spent in R & D in getting things set up correctly, which to me makes for a very nice driveable car not some thing that is great here & there but the cold start is poor, its not flash as its warming up etc, but then its all good ?? if you add the E-mange you can then just fine tune other values if you want to change them, but the other basics / back bone from the factory ECU is still there ..

Plus a full ECU tune from scratch & remap is going to set you back Heaps ..

My 2 cents worth ..

**cresslux** · 22-10-2014, 01:23 PM

you can go full standalone and retain the stock ecu. i have wired PS2000's with auto's. as long as the stock ecu can still see the coolant temp, 3 cam/crank sensors, tps and igf signal, it has no idea its not running the engine and shifts the auto happily.