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Old 08-13-2014, 10:22 PM   #1
LosLS2
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Default And this is why we leave the closed loop enabled w/ Holley EFI

So I got this buddy Jeremy that guess by Heavychevy on the forums. He's got a pretty badass Silverado Crew Cab with a 408ish cube motor and a 94mm turbo on E85. So he's racing this CTS-V with a 150-175 shot. Here's the video. CTS-V gets the hit.


Looks like a nice clean pull. With the scramble and everything, that's about 1200 rwhp at like 4500 lbs. Well, what you can't see is that at about 1.5 secs into the run his fuel pressure went from 70 psi to 42-43 psi within the next .75 seconds (pink line). As this is happening, you can see the Holley spring into action with the closed loop correction (green dashes) and the injector duty cycle follow along with it (maroon line). He's not yet sure what happened but I suspect that the diaphragm in the boost reference fuel pressure regulator broke.



This is the 4th vehicle in our crew that has lived thru a 1000+ rwhp pump issue or failure in a multipump setup.

Have faith gentlemen. The shit works!
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Old 08-13-2014, 10:27 PM   #2
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

Badass! Heavy's truck has really come a long way!
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Old 08-13-2014, 10:55 PM   #3
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

Yes, their wideband does work great. I would also advise to setup some internal safeties.
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Old 08-13-2014, 11:16 PM   #4
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

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.
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Old 08-13-2014, 11:18 PM   #5
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

Quote:
Originally Posted by Mike Beck View Post
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.
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Old 08-13-2014, 11:20 PM   #6
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

wow, that is very cool!! Holley rules!
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Old 08-14-2014, 03:26 PM   #7
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

badass
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Old 08-14-2014, 03:50 PM   #8
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

DAMN. As a Novice running HP on a mild street engine, this is very encouraging. Makes all that money seem a little more "useful."
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Old 08-14-2014, 04:06 PM   #9
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

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Originally Posted by heavychevy01 View Post
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.
Me to, I lost my alternator on a race against an f1 motorcycle. Car ran perfect but during the race the innovate wideband had an error and as we slowed down the lights were dull. Reviewed the data log and injector duty cycle went form the normal 70% range to 125% due to low voltage/fuel pump pressure. Holley Wideband control FTW!!!!!!
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Old 08-15-2014, 09:25 AM   #10
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

damn dat duty cycle!
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Old 08-15-2014, 07:36 PM   #11
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

"Givin' ya all she's got Capt'n! "
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Old 08-15-2014, 08:48 PM   #12
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

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
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Old 08-16-2014, 12:10 AM   #13
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

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.
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Old 09-30-2014, 12:41 AM   #14
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

Doesnt FAST XFI 2.0 does the same thing? i run mine in closed loop with 25% positive correction which is the max.
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Old 09-30-2014, 04:16 AM   #15
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Default Re: And this is why we leave the closed loop enabled w/ Holley EFI

Quote:
Originally Posted by ysitrim88 View Post
...with 25% positive correction, which is the max.
Then it's not the same thing. Also, Holley ECUs have a very fast processor speed.
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