MicroSquirt.com read only forum (Jan.15,2018)

That is totally awesome! I was hoping for something like this for my snowmobile! Leave the MAP sensor out. It is much easier to seal 4 wires than a vacuum line into the case.


Microsqurited Rotary Powered Snowmobile here I come!

Bruce, Al, you guys are INCREDIBLE!

I have been trying to figure out how to waterproof my MSII V3 for the longest time.


Cheers,

Rufus

I'm sure the guys that want to run the two strokes with this will want to try out MAF when that is going, no need for a MAP sensor then.

I know I would use a GM MAP since it's intended for automotive use and sealed up with weatherpack connector and all. Usually you can get them for practically nothing at the wrecking yard.

what looks to me like Copper Pours in the upper/lower LHS or the bottom RHS looks tight, perhaps they could be Taxed ? and whats on the other side of the PCB ?

A small M5 Push in Tube connection or a Barbed Bulk head fitting for ~$1 or $2 would be ok

are there any better Pic's of uS ... the other sides would be nice see ?

So if none of this is a goer then what about connections to the PCB for external mounted BAP ... cant fly with out this!

Could the Hose connection on the MPX4250A be used through one of the mounting Holes in the PCB and use a Push-on Spring Clip to secure it with the aid of a Drop or 2 of Potting mix to secure it in place

Nice to see just the same.
BentRods

If the case is watertight (and airtight) then the MAP sensor needs to be external as it compares atmospheric pressure to manifold pressure and it cannot do that inside a sealed case.

I think it's an excellent addition to the MS family, as it stands with one coil driver though the motorcyle applications are quite limited (as many have already said). Wiring up an external MAP sensor is not much different to having external IAT, TPS, trigger and CLT sensors and most bikes won't need one if they run Alpha-N. For the single coil cars/off-road vehicles the microsquirt looks ready to go with external MAP sensor. As a prebuilt unit with its compact size, input versatility (trigger options) and very low price compared to other products I think it is a very high achievement.

Ian.

This is a nice one ,could be used to tweak up old carbed outboard engines , which is something i come across every now and then....

newtyres wrote:If the case is watertight (and airtight) then the MAP sensor needs to be external as it compares atmospheric pressure to manifold pressure and it cannot do that inside a sealed case.

Nope, it compares manifold pressure to an internal vacuum reference, hence the AP = Absolute Pressure. So it _could_ work inside the case.

James

This looks really cool! This also would be perfect for my riding mower that runs on propane! BUT about waterproofing..... I hope you go with a good case with a gasket seal instead of potting this in some kind of goo. Even a coating would be ok. I frown upon not ever being able to look at the components on the board. A coating should be scraped off and connections made if needed. Potting is just depressing for me. Anyhow just my 10 cents. This look like a real work of art here. You sure did leap into the 21st century with this one. Todays electronics is all about doing more with less space and power. This is it. I'm impressed. KUDOS.

I agree...

On the subject of MAP sensors, would any from Australian model VS/VT
etc commodores be suitable ?


Sid

Posted by email.

sidy wrote:On the subject of MAP sensors, would any from Australian model VS/VT etc commodores be suitable ?

Sid,

You'll need to do some research to verify it, but if it has a simple linear voltage output proportional to absolute pressure, like all other GM sensors, then yes.

Eric

Thanks for the correction James, I used to be an instrument fitter, should know better! Sidy, if you give me one of those GM MAP sensors I can run it up at work (20 to 100kPa).

Ian.