Holley HP install and tips

sytyguy

sytyguy

Moderated User
Re: Holley HP install and tips

fivetodrive said:
And you have sold 17 of them? What have you sold the most of? Sorry to hijack...
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Well, 18 counting the one that came through today (albeit, just for the ECU, main harness, and inj harness).

What have I sold the most of? Meaning of ANYTHING? Looking at my sales since 1999 (when I first started selling to the SyTy community), my top 3 are:

#1 - ABS Delete Kit - 1144 units (combination of hard line & braided sets)
#2 - NGK UR6 - 5472 individual units (912 sets of 6)
#3 - Brass Cap/Rotor - 787 units

Or did you mean what have I sold the most of from the Holley setup? Main harness and ECU are in every sale, so they're the most sold from that setup.
 
cloneman315

cloneman315

Active member
Re: Holley HP install and tips

I am ready to pull the trigger on this shortly, can anyone explain the use of the factory gauges etc?
 
randy merritt

randy merritt

Donating Member
Re: Holley HP install and tips

cloneman315 said:
I am ready to pull the trigger on this shortly, can anyone explain the use of the factory gauges etc?
Click to expand...
All the factory gauges work fine with the Holley installed (don't know about the boost gauge), but speed, rpm, oil pressure, temp, are all OK.
 
DaveP

DaveP

Active member
Re: Holley HP install and tips

You could make the boost gauge work also by installing a stand-alone MAP sensor specifically for it. You would need a 5V reference voltage from the Holley, but that's no biggie.

Oil, temp, and tach have nothing to do with the ECM. You can install a carburetor, and those gauges will still work.
 
0966Sy

0966Sy

Code what?
Not exactly sure what all would be involved. I had an idea to use the factory boost gauge as a alcohol level gauge besides relying only on a low level light. My tank is 3 gallons so not sure if it would really benefit everyone to figure it out. That's the only factory gauge that is basically worthless taking up space when using a standalone.
 
randy merritt

randy merritt

Donating Member
Re: Holley HP install and tips

I am looking to have the HP disengage the A/C when I go above a certain TPS or CTS. I have only negative triggers to work with. I think this will work, with the Holley calling for a constant ground until the TPS or CTS parameters are met (too hot or jamming on the gas). Wiring guys, please review and validate what I am thinking. I can not pass many amps through the Holley. Thanks.

 
randy merritt

randy merritt

Donating Member
Re: Holley HP install and tips

DaveP said:
This is fine, Randy. To protect the Holley from voltage spikes, put a 1amp diode across 85 and 86, with the band on the diode towards 86.
Click to expand...

Thanks as always, Dave. Time to go to Radio Shack, assuming they still sell diodes. My college electrical engineering class (which I barely passed) tells me that a diode is a one way valve, basically. Correct?
 
DaveP

DaveP

Active member
Re: Holley HP install and tips

Yes, that explanation is the most technical I've seen. Thanks.

Another consideration with your proposed circuit above is that the A/C compressor clutch ALSO has the potential to spike the Holley through the connection between 86 and 30 on the relay. This compressor spike is what I was concerned about.

Stock SyTy compressor connectors have a diode across the green and black wires right at the connector. Pull the boot back, and it is right there. Be sure this one is still intact too. The band is towards the green wire.

The magnitude of the potential spike with this circuit, because of the clutch coil, is what prompted me to suggest the spike protection at the relay coil. Diodes are really cheap compared to the Holley. Not worth the risk IMO, to run without the protection.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Holley HP install and tips

It's the same process that creates spark for the ignition. V = L * dI/dT. That high voltage gives you radio interference. If you're curious as to why, look up Fourier series! That stuff melted my brain at uni but was fascinating.

/off topic
 
randy merritt

randy merritt

Donating Member
Re: Holley HP install and tips

Time for some more advice.

I am using a + trigger relay to engage the TC, which is done by switching the two upper outermost pins/wires on the ALDL together, just like a lot of folks do with a manual switch, which grounds the lockup solenoid. Would I be better off to switch the ground trigger to the TCC lockup? Could the Holley handle a direct ground from the TCC? If I freed up this + trigger, it would be much easier to use to control the A/C using the 87 and 87a pins on the relay.

In other words, would this be safer and avoiding feedback to the ECU by using a ground trigger to the TCC?

 
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