Newest Megasquirt aka microsquirt - Tuning Forum

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Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 3:58 PM

roughly the same size as a credit card (actually 2.6 x 3.5 inches) with all of the MS2 circuitry and V3 board essentials, including a VR tach input (or regular opto), stepper motor driver, and the VB921 ignition driver. Add to this an AMPSEAL 35-pin connector and a sealed case. The AMPSEAL carries all the ECU I/O, and it has pins allocated for CAN, RS-232 serial, and a bootloader enable wire, and the three front panel LED drive signals - everything comes out of this one connector. The circuitry is pretty much the same as the V3/MSII, with the exception of the injector drivers. The injector drive is not PWM switched, but current-limited to 5 amps, any current draw above 5 amps will be limited. This was done mainly because of the small board size constraints w/ heat dissipation. So, each injector channel (there are two just like the regular MS) can drive up to 4 high-Z injectors directly, but for low-Z injectors the use of an external ballast resistor may be a good idea. The goal is to keep the current draw per channel down to 5 amps or lower in order to keep the overcurrent circuit from kicking in (and generating heat). The flyback voltage (avalanche) on the injector driver is 70 volts, so the close time will be nice and short. The PCB is a 4-layer, and the high-current grounds and power are separate from the digital power.

The other major change is that the MAP sensor is not on the board, so an external sensor will be required. This is not a big issue, since it is easy to define a new MAP sensor curve via. MegaTune

http://www.microsquirt.info/






Re: Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 5:45 PM
awesome !

Now this + a wiring harness + laptop + megatune = tuning bliss ?



15.574 @ 89 mph stock
Re: Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 8:44 PM
Pointless for our application unless you are absolutely concerned about space.

The unit isn't even out yet. Bowling and Grippo have suggested the price will be in upwards of $350 for the unit with a possibility of the price going even higher.

Not worth it when you can build an expandable V3 board with MS2 processor for about $100 less.

Neat design though.





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Re: Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 9:15 PM
yeah i don't see the advantage of this either for us. There is plenty of room to put the regular V3 ro V2.2 boards in out cars and they are cheaper and do the same thing.

just don't see a point sorry



Re: Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 10:56 PM
This design is really only meant for bikes, skidoos and seadoos where space is very limited. I like the idea, but for most of us it would not be practical to use. Tho, it does do CAN bus communications....



Re: Newest Megasquirt aka microsquirt
Tuesday, January 17, 2006 11:03 PM
PoundinFire wrote:

Tho, it does do CAN bus communications....


So does the latest version of the MS2 processor on the V3/2.2 boards...




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