Someone Cracked the Factory ECU

[Leegamer]

How about Dbw adjustments?


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[xnamerxx]

I'm not sure on that one

[Leegamer]

Originally Posted by xnamerxx

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.

[CrankyOldMan]

Originally Posted by Leegamer

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]

Originally Posted by CrankyOldMan

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]

Originally Posted by CrankyOldMan

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.