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Post Info TOPIC: Status & Yoshbox values not stored into Flash


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Status & Yoshbox values not stored into Flash


Finally did a reset of yoshbox values for my ECU. After loading the ECU flash contents using the AUD to my laptop did a file compare and there were no differences. This confirms that the Yoshbox settings are stored elsewhere - after looking at the code I suspect the serial eprom playing a role in this.

Meanwhile I have put some evenings into investigating the ignition pulses. It looks like that at 4krpm@25%TPS they really shorten the pulse the same happens at 6krpm@25%TPS which really has puzzled me. I have tried to find the ignition pulsewidth settings without success.

Meanwhile its getting a bit slower on this project, I am starting to build the bike for next summer. Nothing major, just upping fuel pressure, extending rev limiters, increasing cylinder size and compression ... and most likely will do some porting because of putting more nitrous throught he system. All of this means rebuilding fuel and ignition maps in various dyno sessions in a couple of months time.

So the project is moving to the next step - putting everything we have learned so far into practise.



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I'm still following this! Just waiting for your results...saw your post on the ECU Flash program...I'm all for anything that makes this easier...

Any luck with that HOW-TO yet? Or are you going to wait till you start dynoing? I'd be happy even with the ability to extend the REV LIMIT for right now...

Thanks again for all your work!

Brian

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Brian,

Yes - the results are good - the ecu is working on the workbench as expected, reprogramming is working and in case something fails during reprogramming the ecu has so far always recovered.  Some persons have had problems to get the programming environment working, but we all will eventually get there honing out the difficulties.

So - extending the rev limits and much more is possible already today with the instructions provided on this board.

Then thinking about the future for a while... I personally believe that tuning modern bikes requires special skills that involves understanding physics, electronics and a small bit of programming. This means that us, the early pioneers will be soon accompanied by persons providing ecu reprogramming as a service, those who have unlimited dyno time and who can combine hardware changes together with ecu upgrades. Ultimately when amount of cumulative skills is big enough this may evolve into a bigger community like with mitsubishis and subarus where almost anyone can flash their own limiters and maps to the ecu.







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Petrik...

Can you point me in the right direction on the Rev Limit Extending? I couldn't find any hard facts on exactly what to change to get this to work...also, I read that you have to change it in more than one location...

I'm a motorcycle tech with an electronics degree, and while I understand most of this, I've never flashed a Stock ECU so it's all a bit new to me...

Is there a "how-to" on extending rev limit? I assume I would build the small serial port circuit and use the programs you mentioned in the other post...but what do I change???

Having a short write-up or how-to on this would be helpful in getting started, if you have the time...I really appreciate all your hard work on this...

If you need ot contact me you can reach me at bsj8377@hotmail.com

Thanks!

Brian

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Hi - if you feel uncertain about doing the changes based on information on this board I suggest that we look that who is the nearest person with some experience on this topic who can help you locally.

I will email to get your contact details...


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anything new on the yosh flash content can it be flash over using FDT....

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Based on previous experience I recall that those are stored on external eprom - which can be cleared just by using yoshbox. Writing a piece of code that does the same is possible but not worth the trouble.


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will a teka tool over write the yosh flash content?

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(I still haven't figured out the correct name for the factory fuel trim connector or 'yoshbox' plug so for this discussion I'll just call it a yosh plug)

The short answer to your question is Yes. The Teka and Yoshbox are the same thing from the viewpoint of the ECU and effect the same memory.

The yosh plug consists of two switch inputs and three analog voltage inputs. The yoshbox adjusts the ECU using switches and variable resistors to adjust the input voltages to the ECU yosh inputs.

The Teka is connected the same way and does the same thing only it uses a small computer program and digital to analog converter to generate the input voltages to the ECU. The teka is more 'hitech' and exact but again from the ECUs viewpoint they both look the same. The teka doesn't do anything you couldn't do with a handful of $1.99 volume controls from Radio Shack.

For a more detailed discussion see

zx-12 MAD

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