This is why Holley ECU is better than Stock PCM (VIDEO)
08-14-2014, 11:13 AM
#1
On The Tree
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This is why Holley ECU is better than Stock PCM (VIDEO) 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 **** works!
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 **** works!
Last edited by LosLS2; 08-14-2014 at 11:29 AM.
08-14-2014, 11:48 AM
#2
Staging Lane
That's awesome! Its always nice to see some real world action/data. I am going to be setting up the holley dominator in the near future, very cool.
I used to use an Aeromotive boost reference Fuel Pressure Regulator, and the spring broke while doing some tuning pulls. Luckily I was all over the wideband as it went down so I let off immediately.
I used to use an Aeromotive boost reference Fuel Pressure Regulator, and the spring broke while doing some tuning pulls. Luckily I was all over the wideband as it went down so I let off immediately.
08-14-2014, 01:48 PM
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I had my line that referenced the regulator pop off and my holley ecu added like %25 more fuel for the rest of the run, never knew something happened until I heard a vacuum leak on the the return road and looked at my log
08-14-2014, 03:31 PM
#5
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There are people that will tell you that an aftermarket ECU is a waste of money because they can go just as fast with the stock system. A stock ECU here would have meant at least a lost race and very likely a trip home on the flat bed.
08-14-2014, 07:19 PM
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Holley FTW.
I do have some complaints about it, such as lack of true dual fuel setup and the lack of user definable 5v outputs along with a few others but for the most part, its a bad *** system at a great price point.
Que the ProEfi nut swingers any minute now....
I do have some complaints about it, such as lack of true dual fuel setup and the lack of user definable 5v outputs along with a few others but for the most part, its a bad *** system at a great price point.
Que the ProEfi nut swingers any minute now....
08-14-2014, 07:21 PM
#9
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Also, welcome back Los.
Few people that are here today have contributed near what you have to this community and I for one appreciate the knowledge you have given us over the years.
Few people that are here today have contributed near what you have to this community and I for one appreciate the knowledge you have given us over the years.
08-14-2014, 07:30 PM
#11
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And thank you. This place seems a lot slower than it used to be.
08-14-2014, 07:38 PM
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As far as 5v, just sensors and jazz, i know there is 5v outputs there already on specific pins, just a pet-peve i suppse lol.
You are right about this place being slow. It seems to be mostly stock bottom people these days trying to break the "record". lol.
08-14-2014, 07:46 PM
#13
On The Tree
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5v input is available for sensors or anything else that you want. I can't think of a single thing that you would want to output 5v trigger to. I think that maybe you aren't understanding what they mean by no 5v outputs. The ECU outputs 5v or 12v that you can use to run any sensors which then get hooked up to an input which reads the sensor. The "outputs" are for turning things on like additional fans, solenoids, pumps, shift and/or warning lights, etc.
08-14-2014, 07:48 PM
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5v input is available for sensors or anything else that you want. I can't think of a single thing that you would want to output 5v trigger to. I think that maybe you aren't understanding what they mean by no 5v outputs. The ECU outputs 5v or 12v that you can use to run any sensors which then get hooked up to an input which reads the sensor. The "outputs" are for turning things on like additional fans, pumps, shift and/or warning lights, etc.
I do understand that, what i mean, is i cant pick any output pin that i want and make it output 5v. I dont like that there is only a what, 4 o 5 pins that are 5v?
08-15-2014, 01:49 PM
#17
I have a holley hp efi, car isn't running yet but I can already tell I made out big time!! the whole kit is just absolutely top notch. The harness a lone is a thing of beauty, the interface is AMAZINGLY simple to use. And for the money it CANT be beat. Cant wait to start using mine!
08-15-2014, 02:22 PM
#19
On The Tree
Thread Starter
I have a holley hp efi, car isn't running yet but I can already tell I made out big time!! the whole kit is just absolutely top notch. The harness a lone is a thing of beauty, the interface is AMAZINGLY simple to use. And for the money it CANT be beat. Cant wait to start using mine!
08-15-2014, 04:45 PM
#20
9 Second Club
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 **** works!
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 **** works!
If you can monitor fuel pressure relative to manifold pressure and keep a tight reign over that so anything that falls outside "normal" causes a limp mode for protection against fuel pump/flow issues.
And buy more reliable pumps lol.