We are building a custom bike, with a Honda CBR250R (2015) engine (1 cyl, 250ccm).
We are planning to use VEMS v3.6; currently selecting the right options.
I made a list about the options, and with the possible choices:
| 1-wire interface | not needed |
| EGT-input (exhaust gas-temp. input) | maybe yes, but not essential |
| ETC BridgeOutput Interface | no need, we have manual gas control (with bowden) |
| Flyback type | still do not have certain information, just the type of the injector (Keihin 0660 52219 FBBJF) |
| Hi-side PFET outputs | no |
| Ignition driver | yes, 2+6 (cost-effective and the most suitable for one cylinder) |
| Knock input channels | no |
| LCD connection | yes |
| MAP connection | we have a Keihin sensor unit (with 5-pin connector) for that, still don't have a datasheet, just serial numbers: 5318A (includes MAP sensor, IAT sensor, TP sensor) |
| Mounting-style | flanged case is good |
| Primary trigger | VR (I have found the stock trigger as inductive, then it is suitable, isn't it?) 12 toothplaces, 3 missing |
| Secondary trigger | no, we don't have camshaft position sensor |
| Service | maybe yes |
| Special request | now, we have just initial questions, so we have not got any request |
| With SD card | internal or removable: I thought it is only for logging datas, then what is the difference between the two options? |
So the questions are:
- EGT-input: would you use it in a motocycle?
- Exhaust quantity is much smaller than on other engines. Maybe the 2mm EGT ?
- Injector: which flyback type do you recommend?
- measure injector resistance
- MAP-sensor: we have an external (Keihin) sensor unit, which includes MAP... if MAP sensor signal is between 0-5V => offboard
- Mounting type: what are the other options(no-screws; screws; unspecified) mean in real life?
- choose default or flanged (easiest mounting. The others are for compatibility with old installs)
- VR sensor is the same as inductive sensor (or type of)?
- yes, just "inductive sensor" is a poor name that should never be used (because HALL sensor also measures magnetic induction B, unit=milliTesla). measure resistance in both direction
- SD card is for datalogging.
- alternative option is logging via external tool (PC, notebook, or controller) The logger can be directly connected, or via radio (eg. wifi or BT or special protocol).
- for future improvements: can VEMS handle fast switch
- you mean sudden power supply shutdown ? Careful installation is needed of course. Eg. powerful (max 18V) unidir transient diode should be applied externally. VEMS supply voltage can be +9V or even +7.5V (=> helps power consumption if made with SMPS, and more protection against offensive flyback from inductors like injector(s)).
- or start electronics?
- yes, if engine is rotating it can be controlled
These are my questions for now, if anybody has answers, I would really appreciate.
Thank you.