A tuning tale: BLMs say lean, plugs say rich

[Top Toy]

Do you expect to have any luck getting the bias table for the FIC's? Better hurry up and get them in before the snow flies!

[XfireZ51]

Dennis,

I was told I would have them. Now that I have injectors, I’ll be calling tomorrow to get them.

[XfireZ51]

The people who checked my injectors were good enough to video the several of the injectors including the #7Secondary which had the disintegrated aerator. At first I thought there was no fuel coming from that injector. There is but u can’t see it.
BTW, #7 was the cylinder that had a compression ring broken in 4 parts which
Dr. Greekenstein then repaired. Coincidence?


https://youtu.be/xEvvtr84c8k

[Top Toy]

Very interesting, though, that when the foam settled, the amount of liquid delivered by no. 7 was the same as the others. No. 7 just atomized a lot more than the others. That may have been your best injector!

Sent from my HTC U11 using ZR-1 Net Registry mobile app

[XfireZ51]

Originally Posted by Top Toy

Very interesting, though, that when the foam settled, the amount of liquid delivered by no. 7 was the same as the others. No. 7 just atomized a lot more than the others. That may have been your best injector!

Sent from my HTC U11 using ZR-1 Net Registry mobile app

Dennis,

What u could not see in the video is that the fuel was not atomized. Here’s what the tech said about that injector
“Yeah you can't make out the stream very well. It's solid fuel.” Solid fuel won’t ignite and so that cylinder was running lean. That is verified by looking at the spark plug. Which would explain the busted compression ring earlier. According to the tech, it was squirting like a firehose which explains the frothing. This would also explain the knock I was seeing. He also explained why I would see knock at part throttle but not at WOT.
At lower rpms, the injector is the primary means of atomizing the fuel. At WOT, the higher air velocity thru the runner shears the fuel, much like how the TBI system worked, and so the atomization was achieved in that manner.

[XfireZ51]

Motor is about ready to fire up tomorrow. Just need to torque down plenum bolts.

[XfireZ51]

Motor fired up and idled well today. I can't make any statement about the Accels v the Delphis given the state of the Accel injectors.
Looking forward to doing some datalogging to see what difference this makes.
I have new plugs in the motor so I should have some indication of mixture control. The FIC injectors are rated at 21.5#/hr and are a matched set. We'll see the advantages flow matched injectors provide.

[Top Toy]

Congrats on the speedy recovery! Hope you don't have to do too much retuning.

[XfireZ51]

Perhaps getting into the weeds a bit for some, but when u get Injector Voltage Bias from injector providers, u may not get the values for the voltages specified in the calibration. So u need to do interpolation. I found this utube vid to be very helpful.
This is not specific to Voltage Bias and is helpful for any form of interpolation u may need.

https://youtu.be/w-mbjyA9jxE

[Top Toy]

Did you get the FIC bias table?