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

Thanks Al.

So for a Ford wasted spark 4cyl with the factory trigger setup of crank sensor at 90deg BTDC is -90 for trigger offset and delay teeth of 9 right then? Having read the documentation quite a number of times I'm still not clear on it.

If there is new documentation coming through from ...

I'm sure this should be a FAQ but searching hasn't yielded an answer for me.

In a standard Ford 4-cyl trigger wheel setup (wasted spark, 36-1 crank wheel, missing tooth at 90deg BTDC) what should the ignition settings be? My understanding is:

Trigger-offset = -90 (to account for the 90deg BTDC ...

"quinn" wrote:
> Having trouble finding a spec for distance. What are we looking at? 1/16", 1/8" ?

Cripes, you want it a lot closer than that. A constant distance throughout
the revolution is more important than absolute distances but somewhere in
the 0.5-1.5mm is what you should be looking at ...

You say the turbo is bigger than a T70, well there aren't many turbos bigger than a T70 and if you don't have any provenance for it then assume that it's a truck turbo, in which case it's designed for high boost, rather high flow and efficiency

"bens_cab" wrote:
> Bills sending my wideband out tommorow what sthe best program to use im sure he said use the one chris good has si that you ?? cng

That would be me, yep. http://www.g2.nu/chris/misc/emerald-afr/ is the software.
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"jsmcortina" wrote:
> You may be able to move over the timing map by picking some of the rows/columns. Megasquirt will interpolate between (fill in the gaps.)

I've done exactly that in the past. Emerald uses a 16x16 table and it's
pretty easy if you use your head to translate the basics into the MS ...

"eliotmansfield" wrote:
> You can see once the temperature settles down, I'm seeing about 65-70% turbo adiabatic eff and only 50% chargecooler eff.

I suspect you'll find that the efficiency of the chargecooler improves
substantially when you really start pushing it. As it stands the temperature ...

"efahl" wrote:
> Here's a picture showing one Italian manufacturer's injector location; I believe they warm up the engine before starting.

They also couldn't care less about what happens below about 10000rpm
which helps a bit!
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"danc8000" wrote:

> Also, what's the longest distance people have used for injector positioning relative to manifold face (or intake valve position) that has been fine for cold starting with no form of heating for the intake?

Quit worrying and wade on in. You'll never end up with a system that isn ...

"danc8000" wrote:
> That's a lot higher than I was expecting you to say. :)

Cranking pulsewidths are utterly irrelevant really all you need is enough
fuel for it to catch but not so much that it floods. Because the charge
velocity will be low it's best to just chuck lots in to make it easy for
it ...