Badass! Heavy's truck has really come a long way!

 

Yes, their wideband does work great. I would also advise to setup some internal safeties.

 

Then I might have lost the race. I'm just kidding. I am going to turn on some of the safties back on. And find the fueling issue. This is second time the holley saved my motor. First time was similar, but was do to alternator failing during pass and massive loss of voltage.

 

Yeah, I was thinking that maybe a 150% duty cycle spike should light a bulb or pull all the timing or something. I don't know that I want it to activate at 100% (maximum value the Holley will allow me to input as a trigger). I hate false positives and would hate for someone to lose because of one.

 

wow, that is very cool!! Holley rules!

 

badass

 

DAMN. As a Novice running HP on a mild street engine, this is very encouraging. Makes all that money seem a little more "useful."

 

damn dat duty cycle!

 

"Givin' ya all she's got Capt'n! "

 

That's awesome my Holley did the same thing in my race car. Car went 150% duty cycle and the Holley added 70lbs and hr to my setup. Found out mine was my weldon 2025 was down 50 gallons an hr and diaphragm in my regulator broke also so had them upgraded while out. Everything since has been perfect glad your motor is ok

 

Make a safety output based on sensors...
then (even if you are not using it) add the boost config
then you can use the "Boost safety" and trigger it by the output you set up as a "safety output"
you can then set it to kick on the "Boost safety" if its triggered for more than a specified amount of time (1 second, 2 seconds)
this way you can filter out transient spikes set in the safety output...which can also light a bulb at the same time so you get a visual and it will cut the ignition if it comes on for more than the time specified.

 

Doesnt FAST XFI 2.0 does the same thing? i run mine in closed loop with 25% positive correction which is the max.

 

...with 25% positive correction, which is the max.

Then it's not the same thing. Also, Holley ECUs have a very fast processor speed.

 

well this makes me feel better with my choice

 

Had the same thing happen to me.. didn't know the pump was not keeping up... pressure at 4100 rpm was 61psi.... At 6300rpm it was down to 37psi. Holley Dominator never let it go leaner than 12.0... Injector DC went way up to compensate... Engine never flinched. Amazing!
~Scott

 

thats cool.... the AFR was more steady at 40psi fuel pressure and the computer taking over than mine normally is with me controlling it! haha

 

Impressive to see these things work. I think Holley has really done a great job of ensuring that people will be putting their product on hot rods for a long time to come, to the point where it might well become as ubiquitous as a 4150/4500.

How does the Dominator ECU sample the O2 sensor (per ignition event, or per...)? My first thought is the latency in the O2 signal is likely orders of magnitude larger than the clock speed on even an older 8MHz unit, much less the 24 or 50Hz+ processors being used by modern controllers.

Also, out of curiosity is Holley using a PID algorithm for Target AFRs? I'm guessing requiring Holley-specific sensors really helps standardize and improve performance of the EGO feedback loop and may minimize the utility of PID.

 

I'm sure it's a PID control method but it's done automatically in the background.

 

Holley saved me as I ran out of fuel pump as well. Datalog showed injector duty cycle way up and fuel pressure tapered off.

 

Same here. Lost 40lbs of pressure, AFR looked great.