I use VEMS V3.6 on my dragcar powered by a cbr1100xx engine. Until now the engine was running on four carburetors plus nitrous and the performance was very good (8.7sec@402m). I turned to fuel injection and VEMS in order to use all the extra racing features (like launch control, shift cut, etc) and be able to have a more precise engine control.
IMPORTANT NOTE: USE MAP SENSOR FOR ENGINE LOAD AND TPS FOR ACCELERATION ENRICHMENT. EVEN WITH 4 THROTTLE BODIES INDUCTION SYSTEMS (ONE THROTTLE BODY PER CYLINDER) AVOID USING TPS FOR ENGINE LOAD.
Firing sequence: 1,3,4,2
Ignition outputs (wasted spark/2 coils):
cyl2 EC36-pin36
cyl4 EC36-pin34
cyl3 EC36-pin36
cyl1 EC36-pin34
Injector outputs
cyl2 EC36-pin19
cyl4 EC36-pin20
cyl3 EC36-pin8
cyl1 EC36-pin7
Other outputs in use:
fuel pump relay EC36-pin15
NO idle air valve because injection bodies have special air valves for idle controled by water temp (almost all injection CBR engines).
Shifter relay EC36-pin4
TPS original pinout (EC36-pin1/29/AN.GND)
CLT IN original pinout (EC36-pin14)
Prim. Trigger original pinout (EC36-pin27/AN. GND/ Shield)
MAP Sensor original input (EC18-pin6)
No other inputs/outputs are used.
SOFT/FIRM
In the past (1.0.73 firmware) I was using MegaTune software with no problem.
answer this questions please
I configured the ecu myself from the start and it was almost as easy as any other ecu I have used until now. I have not saved the config file (my fault).
I used also the VemsTune0.10.20(2010.03.08) and the firmware uploaded on VEMS V3.6 is 1.0.73.
- that is good. Stick with 1.0.x because the 12-3 pattern is supported only by 1.0.x firmware. (1.1.x works with N-1 or N-2 but not with N-3 !)
TRIGGER
I use the original trigger wheel and VR sensor of the cbr1100xx with no problem. The cbr1100xx (carburated model) uses a 9teeth trigger wheel with one big missing tooth (later injection model had a 12teeth trigger wheel with no missing teeth).
It's a 12-3 pattern (toothwidth=30 degrees).
Unfortunately this is not supported with 1.1.x firmware, you can only use N-2 or N-1 pattern as set in the primary trigger options. You might need to use 1.0.x firmware for now with this pattern.
The following Trigger Setting were tested as long as I use the Megatune and were proven to work fine with 1.0.x firmware.
Now I use Firm 1.0.73 and everything works fine. Engine fires up and is tuned easy.
I have uploaded my working config in the files area.
- plan to change to N-1 or N-2 trigger wheel (which one would you recomend?)
- 12-2 recommended, as 12-1 sometimes sees so quick RPM changes during cranking that "advanced filter" must be used and adjusted. Otherwise 24-1, 36-1 or 60-2 are common (and good) setups.
- note: 4-1 is the simplest trigger for a 4cyl.
- I will try to move on a newer firmware.
- See the latest released on GenBoard/UnderDevelopment/FirmwareChanges (currently 1.1.70). Don't attempt it without following the instructions! Config MUST be uploaded after upgrade.
- please postpone this if possible. There are much more settings in 1.1.x and there is little to gain.
I use the original honda MAP sensor thta is attached on the throttle bodies. To adjust the sensor range in VemsTune set
Offset:
Range:
Coolant temperature sensor
ECU is not responding on coolant bins/firm 1.0.73 because the internal pullup (2k7) is ment for appr 2000 .. 2252 .. 3000 Ohm sensor, not a low resistance sensor like the CBR1100 has:
Stock Water Temp Sensor (CBR1100XX)
C/Ohm
15/785
20/570
25/440 Surprisingly low resistance. Appr 19.5% of standard 2252 ohm.
30/355
40/237
50/157
60/107
70/74
80/55
90/40
100/29
Thanx for the precise specification in your query (3..4 points are usually OK with NTC sensor; the 25C point helps a LOT. Thanx!)
- A 656 Ohm (650 ohm should be perfect) pullup resistor (in parallel with the onboard 2700 Ohm)
- gives effective 528 Ohm (which is 19.5% of the default 2700 Ohm).
- That gives same curve as the standard sensor and standard pullup.