Search results

Everything I know about it is in this thread: https://www.mustang6g.com/forums/threads/gen-4-darkhorse-coyote-swapped-mach-1.225923/#post-4445767

You said you don't see the mystery like it's obvious, but then said it "looks like" and you have a "theory". I agree at this point that it looks like your red line was the initial failure and all the other carnage was a result. But that's not a root cause; it's just a timeline. A root cause...

Psi not kpa.

Below is a stock GDI pressure table. You can see it's a function of injected fuel mass. Once it gets under heavy load it will go up to 2900. Unless the GDI injectors turn off, the pressure will fall as soon as the fuel mass falls. It's unlikely that GDI pressure is causing your misfires.

I'm far from an expert but I think I can shed some light on this. You are correct that the DI pump takes fuel off of the fuel rail then pressurizes it further. It's a positive displacement plunger pump. The flexible hose that supplies fuel to it has a check valve in it, but the pump itself...

No, the typical user only needs the ~$200 version to access engine and transmission. The transmission isn’t separate.

I guess this is where we disagree. I believe it does matter because something can be learned from failures to help prevent them in the future.

Not that I have seen, but I trust Ford engineering over the aftermarket. Even the 2018 cobra jet runs tighter ring gaps than the aftermarket generally recommends. I pick something in between the gt500 and cobra jet specs to use. The idea behind wide ring gaps is to prevent ring gap butting...

Ford doesn’t subscribe to that train of thought. The oem ring gap specs are mind boggling if you have the old mind-set. I was there as well. Some of the ford top ring specs are as tight as .008, even on ecoboost. I’ve heard other oems are doing the same because it helps the top ring stay...

I spot checked a few ring gaps on the old motor and they were .015 top ring and .030 2nd ring. Coyote spec is .008-.012 top and .020-032 2nd.

Technically if one were in a rush, you can take this thing apart, clean out the venturi, make sure the screen is installed, and put it back together. I could do this in about an hour with just one tool (the gas tank lock ring removal tool). I can post pictures and instructions if anyone wants...

Ok, now that I read that article, it became clear. The electric lift pump has a sidestream outlet that supplies fuel to a pair of venturi jets, one pulling fuel into the bucket from the driver's side saddle, and one from the passenger's side saddle. The venturi jet orifices are .016" diameter...

Looks to me like ECM43282 in post 8 crosses over to auF60775.

The transmission is mathematically modelled in the logic beyond what you can imagine. If you change the clutch stack-up dimension or number of clutches, coefficient of friction, pump characteristics, or torque converter k-factor or torque-ratio vs speed-ratio, then technically the stock...

I’m almost certain the gt500 has the same pump. I wonder if the batches were different and free of the issue. https://performanceparts.ford.com/part/M-9407-M52SC

Just took it easy for a couple hundred miles then changed the oil. On finding cylinder pressure limits, I looked at about a dozen cylinder pressure limit timing maps for different coyote variants and found that the Raptor R version looks like it’s well-developed by Ford with approximately the...

The original one or the low compression replacement?

That’s the goal, wanting to wind up in the 20 psi range. We ran into a bit of a snag in the individual cylinder BLK timing offsets and how the cylinder numbering works. Some parameters are a function of cylinder number, some are firing sequence number, and some are firing sequence minus 1.

Spent most of today tuning the new motor. It seems to take 3-4 deg more timing on true pump gas before finding the knock limits. At 1.9 load was touching 20 deg and at 2.1 load maybe 17. Honestly I was hoping to be able to add 5-6 but it just wouldn’t take it.

Ha! No, I snipped that from this thread: https://www.mustang6g.com/forums/threads/gen-4-darkhorse-coyote-swapped-mach-1.225923/ Looks eerily similar but that one was a 48,000 mile na tune-only engine that let go.