Speeduino 2T EFI Project

**T0M** · 9th February 2024, 03:11

Originally Posted by TZ350

This has been my problem and I have not really got that smoothly pulling away from the apex working very well myself. Tuned 125 with competition pipe.

Before I rush out and buy a MaxxCPU to replace my Speeduino. If you can I would be very interested in a video clip of how well the MaxxCPU handles fast paced riding and corners for you.

A PDF of the MaxxCPU manual would be very welcome too.

I admire your work.

I drive only on the street, and there is not one situation in which the fuel injection does worse than the carb. Even, if I pull the trottrle to full opening from very low rpm. However, I can try to simulate your situation next time, when I will be on the dyno. It has a mode, wher it simulates real driving by using speed and drag coefficent.

I guess the MaxxECU will not resolve your problem. My engine worked also well with the speeduion, however I was sick of replacing damaged circuit bords. The last one I destroyed by my self, as I tried to add a log-to-SD-card functionality . This was the time I switched to MaxxECU.

It is not clear to me why, but the VE table gained from the dyno runs did not worked well on the street. I need to log the fuel-injection and AFR during real riding in order to be able to create a good working VE table.

The MaxxECU seems to cost more than the speeduion, but the software is allrady included (similar to tuning studio) and you get a very nice wiring harness with a good connector. The manual is online:https://www.maxxecu.com/webhelp/index.html

The wirings (and other stuff) is here: https://www.maxxecu.com/downloads
For the MaxxECU Mini, which I use it is: https://www.maxxecu.com/files/Docume...0Wiring-en.pdf

The MTune software is what is tuner studio for speeduino. The free download is here (incl. manual): https://www.maxxecu.com/mtune

I attached my tune file: VespaR244_Duke250.zip

The VE Table has some quite high values for low rpm at full throttle.

The lambda table is quite lean for low rpm and low throttle openings. The carb was alrady showing this behaviour.

Hopefully, I did manage to include this pictures correctly within the text.
VespaR244_Duke250.zip