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)).
- maybe you mean "SHIFTCUT" (by "fast switch") ? [Shiftcut] is supported.
- or start electronics?
- yes, if engine is rotating it can be controlled
I would like to use oil temperature and oil pressure sensors:
I found these ones suitable (for pressure):
- http://shop.vems.hu/catalog/differential-pressure-sensor-p-127.html
- https://shop.vems.hu/catalog/pressure-sensor-p-100.html
For temperature, what do you prefer/offer?
I am thinking about using a VW Bora 1.8T ignition transformer (stock number: 715459 0040102043), but I need a 10mm shorter one.
Do you think is it okay to use this on a motobike engine or use some CDI driver? Or what do you recommend?
VEMS supports shiftcut, yes. Input can be shared with launch, or separate (or when launch is not used => of course "separate").
08.05.
So now we are on the way, to build up our bike. Some VEMS parts like EC connectors, WBO2 (LSU4.9) sensor and some relays had arrived. have already tested the TPS and IAT sensors with DMM, also tested the IACV, which is a 4pin stepper motor (R=110 Ohm).
Successfully bought a Coil On Plug transformator, which fits well to the engine block.
We are also planning to use a Mechatromotive Racing LCD, which communicates through AIM with VEMS.
Question nr.1: measured the resistance between the 2 CKP sensor outputs, the resistance is the same in both direction, 236 Ohm, so it is a VR type. Please, confirm, if I think well.
Other questions, not very important, only for future improvements:
- does VEMS know, how to handle CAN systems?
- for quickshift/shiftcut, which sensor do you prefer?