Someone Cracked the Factory ECU

[xnamerxx]

Well it looks like someone finally figured out how to crack the factory ECU. I'm still doing some testing, but initial tests look pretty promising.

https://www.youtube.com/watch?v=MH9nHxnjCVc

[CrankyOldMan]

They bypassed the electrical rev limiter?

[Leegamer]

Is this your youtube channel? I want more details!

[xnamerxx]

My channel my car.

They upped the rev limiter from 6600 to 7400, increased timing to run on 93, removed the top speed limiter, and increased the valve timing a bit more.

So far the car is still sitting on a trailer so I haven't done any testing aside from idle and rev it, but that'll happen this weekend if all goes to plan.

[06YarisRS]

YES. Need more details!!! With this crack, can injectors be controlled?

[xnamerxx]

Yes from what I was told injectors can be controlled I believe he leaned it out a touch for me as well but I won't know until I get it off the trailer and look at the logs.

I'm not sure how much remote tuning can be done since the guy who did the crack had to have my ecu in order to make changes.

[Leegamer]

How about Dbw adjustments?


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[xnamerxx]

I'm not sure on that one

[ern-diz]

Shit just got a bit more interesting around these parts, eh?

[heeroyuy01195]

Subscribed :D

[Leegamer]

I'm not sure on that one

If they can do DBW adjustment to get rid of rev hang, I'd buy another ecu just to send to them to crack and adjust.

[xnamerxx]

The throttle hang is a complicated problem, alot of it caused by the really heavy and big factory flywheel. Even with the lightweight steel one on this engine it happens a bit.

The only thing I'm seeing in my logs is the throttle % going from 16 to 17 right as it nears 1k rpms which it does to keep the engine from stalling.

But once everything can be validated and I get the go ahead from this tuner, I'll give out their info.

[tmontague]

Yes definitely interested. I'd love to buy another XD ecu and have them raise the rev limiter push timing for 93 octane and get rid of the governor.

This would really help tie me over until I go standalone

[Jason@SportsCar]

Well it looks like someone finally figured out how to crack the factory ECU. I'm still doing some testing, but initial tests look pretty promising.

https://www.youtube.com/watch?v=MH9nHxnjCVc

Game changer for sure. :thumbup:

[06YarisRS]

If I could get rid of my AEM F/IC and run a tuned stock ECU, I'd be grinnin' from ear to ear.

[CrankyOldMan]

How about Dbw adjustments?
Time to be a Debbie Downer. I'm all in favor of pushing performance limits but I want to urge caution in this specific area.

Having recently spent some time looking at the "unintended acceleration" issue investigations from a few years back, I would be very hesitant to do anything related to throttle control. The system is specifically designed to be resistant to unexpected feedback but as we all know, there are circumstances that will cause very bad things to happen. There's a reason they don't want you in the code, this being one of the bigger ones. It's considered a 10/10 safety critical feature by the FMVSS, meaning that a failure of the system can result in death or serious injury.

I'm still planning on using a standalone (MegaSquirt) ECU for any crazy 1NZ builds and going with cable throttle. That means you can do whatever you want with rev limits, injectors, cam timing, etc. and not have to worry about a critical safety feature going awry and remove the laggy throttle response to boot.

That said, this is still a major achievement and I don't want to besmirch xnamerxx's success.

[Leegamer]

Time to be a Debbie Downer. I'm all in favor of pushing performance limits but I want to urge caution in this specific area.

Having recently spent some time looking at the "unintended acceleration" issue investigations from a few years back, I would be very hesitant to do anything related to throttle control. The system is specifically designed to be resistant to unexpected feedback but as we all know, there are circumstances that will cause very bad things to happen. There's a reason they don't want you in the code, this being one of the bigger ones. It's considered a 10/10 safety critical feature by the FMVSS, meaning that a failure of the system can result in death or serious injury.

I'm still planning on using a standalone (MegaSquirt) ECU for any crazy 1NZ builds and going with cable throttle. That means you can do whatever you want with rev limits, injectors, cam timing, etc. and not have to worry about a critical safety feature going awry and remove the laggy throttle response to boot.

That said, this is still a major achievement and I don't want to besmirch xnamerxx's success.

It's very common to use standalone like haltech to control DBW, so I don't understand the problem.

[tmontague]

Time to be a Debbie Downer. I'm all in favor of pushing performance limits but I want to urge caution in this specific area.

Having recently spent some time looking at the "unintended acceleration" issue investigations from a few years back, I would be very hesitant to do anything related to throttle control. The system is specifically designed to be resistant to unexpected feedback but as we all know, there are circumstances that will cause very bad things to happen. There's a reason they don't want you in the code, this being one of the bigger ones. It's considered a 10/10 safety critical feature by the FMVSS, meaning that a failure of the system can result in death or serious injury.

I'm still planning on using a standalone (MegaSquirt) ECU for any crazy 1NZ builds and going with cable throttle. That means you can do whatever you want with rev limits, injectors, cam timing, etc. and not have to worry about a critical safety feature going awry and remove the laggy throttle response to boot.

That said, this is still a major achievement and I don't want to besmirch xnamerxx's success.

Hmm interesting, I don't think I would play around w/ the throttle too much. In the end there is no substitute for a standalone for what I want to do with my 2zr. But if the price is right this would help free up a bit more power and utilize 93 octane pump gas while I save up the funds for a standalone and tune

[xnamerxx]

Not my success, someone else broke it not me, I'm just a tester.

I'm not sure a MS is compatible with the 1NZ timing pattern, that's why I was running a AEM series 2. I also don't think you can run dual VVT with it as well.

While I like the standalone ECU for some of its features, I really hate some of the problems that it has, it can be difficult to start because the ignition sync takes forever, throttle control sucks unless you convert it to cable throttle which isn't ideal. You also lose a ton of the safety features the stock ECU provides which can't be matched with aftermarket ECU's but there are certain occasions where the stock ECU is going to be a limiting factor, like in some turbo applications and such since it can't take the additional sensors.

I wouldn't be concerned at all modifying the DBW tables if they're available but the complaints I'm hearing are likely from other issues.

Honestly once I got rid of the heavy flywheel I stopped having laggy throttle its not even something I've noticed on my race engines.

[suprf1y]

If I recall from when I looked into it, the problem with MS is the DBW, though I think it starts to get pricey with VVT

[xnamerxx]

The series 2 has that problem as well and you have to run the aftermarket and factory ecu in order to control the throttle. Alot of aftermarket ecus have probelms with the Toyota cam timing since it's a weird pattern.

[ezhacker1]

i used to use a Throttle Controller. only thing that happens if it fails is the car throws a Throttle voltage code and car goes into Limp mode. which means you gotta mash it to get it to even rev a little.

[fredovvti]

Here in Puerto Rico a guy crack all ready all Toyota Ecu's. He can adjust the ECU for fuel economy and for extra horse power. You can check him in facebook by Wilson Chip Tunning

[invader166]

Just an quick FYI.

If anyone is looking for a quick and simple Plug-and-Play solution to increase power or fuel economy, there's always VOLO. They've recently launched their new VP16 touchscreen programmer, and now the old VP15 is on sale for 50% off.

https://volochip.com/products/vp16-touchscreen-power-programmer

[SirDigby]

Just an quick FYI.

https://volochip.com/products/vp16-touchscreen-power-programmer

i wonder what's going on here...

[06YarisRS]

I messaged Wilson Chip Tuning what follows. I don't know much about ECUs, but I'll post back their response if they are ok with my doing so.

"Hi. I read on yarisworld.com that you have figured out how to do some programming to most Toyota ECUs. I have a Toyota Yaris with a Corolla 1.8 2ZR-FE engine and an installed turbokits.com turbo kit. I'm using the AEM F/IC but probably should have purchased a standalone ECU. I cannot control partial throttle fueling in closed loop. Can you make changes that will force the car into open loop when boost starts other than full throttle? Or is there something you can change in the ECU so that I can have richer AFR under partial throttle boost. Thank you very much....I forgot to mention that I am using a Scion xD automatic transmission ECU."

[xnamerxx]

Testing on the ECU has gone quite well, car runs just fine and does everything I need it to.

Company that does it is FTG Tuning up in Washington FTGtuning@gmail.com, if anyone wants to try and duplicate my results.

[06YarisRS]

Testing on the ECU has gone quite well, car runs just fine and does everything I need it to.

Company that does it is FTG Tuning up in Washington FTGtuning@gmail.com, if anyone wants to try and duplicate my results.

I am going to send them the same questions I asked Wilson Chip Tuning. Do you think what I'm asking is possible? If I could do away with the FIC altogether, I would. Not sure if the changes to the stock ECU programming would be appropriate for a boosted (even low boost) application. Care to speculate on any of this? Thanks.

[xnamerxx]

I can't say it seems like a hard way to try and get a alpha N tune for part throttle. It seems like it would be easier to use the factory logic and just tune the car using that, but I don't know what kind of sensors can be integrated into the ecu.

[06YarisRS]

I don't know if it's feasible to trigger open loop by interrupting the AFR sensor signal on my setup (Scion xD ECU). I'm doing some reading on the Mazda forums where high AFRs during part throttle boost were addressed by using a vacuum powered switch that goes to an open circuit when boost is present. It effectively cuts the signal to the ECU as soon as there is positive pressure. I don't know if this would actually send my ECU into open loop and if there would be any other complications if it did. Probably a revised fuel map would be needed. I also read about a fellow who altered the TPS sensor signal to fool the ECU into thinking it was at WOT. Finally, I read one post in which a guy was told by his tuner that around 14.5 AFR is ok under partial throttle. Although I'll probably be running around 7 psi, I would worry about these partial throttle AFRs. Having an automatic trans isn't ideal at WOT as it kicks down and really revs. Anyway, I didn't intend to hijack the thread. It will be interesting to see what all can be modified in the ECU.

[thebarber]

Happen to know if he could do anything for a supercharged 1NZ from an echo?

[xnamerxx]

I'm not sure, you'd have to ask, I'd have to imagine he could but its not something I can confirm.

[tmontague]

What is a ballpark whp number from non dyno tuning an ecu and nust remapping it to run on 93 by advancing timing?

I'm seriously contemplating have my ecu mapped for 93 and raiding rpm limit to 7500

[xnamerxx]

I can't say for 93 since I've always tuned my engines for 100 but I wouldn't imagine you'd get more than 1-2hp going up to 100.

On the stock engine with my long tubes\CAI\and a ECU tune, I could get between 134-141 on Churchs dyno, which is about 120-125 give or take on a mustang dyno. Same dyno same car made 120 on Churchs dyno with a DC racing header and nothing else. So tune was worth give or take about 10hp, but this is all on a 1nz not a 2zr so results may vary.

[tmontague]

Hmm, interesting results you posted. I would expect the 2zr to do slightly better due to larger displacement but that is a guess.

An extra 10ish whp combined with a high rev limit would make the car faster in a lap at TMP. There are a couple of back to back turns where I am at the top end of 2nd gear, but 3rd is a little too tall for the turn.

[xnamerxx]

To hats basically the reason I have the rev limiter bumped, stock cammed engine is dead around 6k so no power up top. 1nz was pretty detuned from the factory with really small cams, so there is allot to be had with certain kinds of work, if 2 zr is the same you should expect similar results.