Lighter = Faster (N/A build thread #2)

[FC Zach]

Originally Posted by infernosg

It turns out 3/4 wires in the sub-harness connector were wired incorrectly. After de-pinning and correctly re-pinning that connector there's continuity from the ECU to the injector. Just to be sure I also went back and checked the ignition wires. Fortunately those are all good.

Hmmm. . Mine was that exact same way!

[infernosg]

Originally Posted by FC Zach

Hmmm. . Mine was that exact same way!

I assume yours wouldn't start either? I figured it might at least start on one rotor.

Last night I tried to better set the base fuel pressure without the engine running. The Aeromotive FPR doesn't hold pressure long after the pump is turned off so I had my wife watch the gauge and note the peak pressure during priming. It was ~60 psi at first time around so that might explain the excess fuel. I got it to ~45 psi and called it good enough.

I'm certain I flooded the rear rotor. I squirted a 1/4 teaspoon of 2 stroke engine oil into the both rotors and cycled the starter until I just about drained the battery. My intake and garage still reek of fuel though so I don't know how much good that did. Tonight I may put the spark plugs back in, keep the injectors and fuel pump disabled, crank the engine, and see what happens.

At least I got the display set up. I won't know if the speed or odometer works until the car is moving but everything else appears to be functioning properly. The only issue is I can only display fuel level in liters.

[FC Zach]

Mine wouldn't start because of a number of factors, not just from the injector wiring. But yeah, I would think it would fire on one rotor.

[infernosg]

Well, I got it started. I think it was a combination of too much fuel and the throttle being too open. I backed off the throttle stop to around 3% (was 5%) and immediately the engine started to catch more and more with each start attempt. When it finally caught it idled around 700 RPM and was running super rich (<11:1). After adjusting the throttle stop and the fuel settings I got it to idle fairly consistently around 1000 RPM. I played with it for over an hour, varying engine speed from <1000 RPM to just over 3000 RPM. I ultimately stalled the engine with what I think was a lean condition. I tried to restart it but after two failed attempts (too lean again?) I had drained the battery. I'll try again tomorrow but I'm thinking I may have to set up some kind of post start enrichment strategy.

[infernosg]

I'm not sure how to embed videos from Google Photos. Does this link work: https://photos.google.com/share/AF1Q...I3akVubllYdE1R?

Sorry for the noise. The fan had just kicked on. It's idling around 1000 RPM. Anything less and it gets a little rough/unstable. It's quieter than I expected, but I haven't taken it much over 3500 RPM or about 10% throttle. Tuning is turning out to be difficult. No-load idle is pretty much sorted out to 4000 RPM. Tuning under load on the road is painful. Going from no load to load is requiring a massive increase in fuel due to the large changes in incoming air volume associated with small throttle movements. I assume this is handled by transient throttle adjustments but I read not to mess with that until the base fuel map is sorted. This would be much easier on a dyno. Any advice is welcome!

[project86]

Originally Posted by infernosg

I'm not sure how to embed videos from Google Photos. Does this link work: https://photos.google.com/share/AF1Q...I3akVubllYdE1R?

Sorry for the noise. The fan had just kicked on. It's idling around 1000 RPM. Anything less and it gets a little rough/unstable. It's quieter than I expected, but I haven't taken it much over 3500 RPM or about 10% throttle. Tuning is turning out to be difficult. No-load idle is pretty much sorted out to 4000 RPM. Tuning under load on the road is painful. Going from no load to load is requiring a massive increase in fuel due to the large changes in incoming air volume associated with small throttle movements. I assume this is handled by transient throttle adjustments but I read not to mess with that until the base fuel map is sorted. This would be much easier on a dyno. Any advice is welcome!

This is super exciting. But no the link doesn't work.

[infernosg]

I can get the car to start, idle, and rev freely up to 4000 RPM. I'm sure it can go higher but I'm hesitant with the engine not broken in. Transient throttle situations and anything with more than 10% load is causing lean situations that cause the car to die. I literally can't drive it out of my driveway at this point, which is beyond frustrating. Unfortunately, it looks like I'm dead in the water until I can find some assistance because this is beyond me.

[project86]

Originally Posted by infernosg

I can get the car to start, idle, and rev freely up to 4000 RPM. I'm sure it can go higher but I'm hesitant with the engine not broken in. Transient throttle situations and anything with more than 10% load is causing lean situations that cause the car to die. I literally can't drive it out of my driveway at this point, which is beyond frustrating. Unfortunately, it looks like I'm dead in the water until I can find some assistance because this is beyond me.

How experienced are you with tuning? That is something that I have always wanted to know more about but I haven't been willing to dedicate the time to it. That's really the most intimidating thing to me about starting from scratch.

[infernosg]

Originally Posted by project86

How experienced are you with tuning? That is something that I have always wanted to know more about but I haven't been willing to dedicate the time to it. That's really the most intimidating thing to me about starting from scratch.

Not very. Most of my experience is with piggy-back units in piston-engined cars. Just altering fuel and timing to improve power at partial and wide-open throttle. I don't have any experience starting from scratch. I've relied heavily on Chris at Ludwig Motorsports and Brian (TitaniumTT) just to get where I am now.

[infernosg]

New kid takes time away from working on the car. I managed to get a couple things done this week while off of work:

-Changed oil and filter. Went with 10W40 weight this time and I'm still seeing 40+ psi of oil pressure at idle.
-Moved my vacuum manifold to the top of the intake manifold. The previous location allowed residual premix to pool in the vacuum manifold.
-Added a 1 bar MAP sensor to give me the option to tune with speed-density.
-Added 6 more oz of premix to bring the ration closer to 1.5 oz to 1 gal fuel during break-in.

The last one really messed with my tune, I think. What worked before was now running very lean so I had to add a bunch of fuel back. I've got it running again but I haven't got it out on the road yet. Hopefully I'll get a chance this weekend.

I've also ordered a FFE primary fuel rail and two ID725 injectors. I think relying on two ID1000 injectors in what are essentially secondary injector positions is going to prevent the car from running smoothly. Hopefully running smaller injectors in the stock primary location will smooth out idle and part throttle conditions. Vacuum sits around -6 psi at idle but peaks around -10 psi revving the engine in neutral below 3000 RPM. Hopefully this is enough to use speed-density tuning.

Lastly, and not sure if this'll work, but here are the latest pictures:

[FC Zach]

Originally Posted by infernosg

Lastly, and not sure if this'll work, but here are the latest pictures:

They don't show. . on my phone at least.

[infernosg]

Originally Posted by FC Zach

They don't show. . on my phone at least.

Trying something new. Maybe this worked.

[RETed]

TinyURL redirect to Google Photos?
It looks like your Google Photos account isn't set to public viewing...


-Ted

[infernosg]

Originally Posted by RETed

TinyURL redirect to Google Photos?
It looks like your Google Photos account isn't set to public viewing...


-Ted

Tried Google's own url-shortener this time. The issue is the album IS set up for sharing but Google has apparently done-away with the ability to embed images. They would rather the system only work through links and invites. It seems like whatever work-around I find is only temporarily. For example, I tried TinyURL over the weekend and I was able to view the pictures when viewing this site incognito. I checked again this morning and they were "x's." Even the album link: https://goo.gl/photos/6cLWLXYDxTRiWYtG6 doesn't work for everyone.

[FC Zach]

I use Flickr, no complaints there.