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-   -   Holley HP EFI conversion (https://www.offshoreonly.com/forums/general-q/365834-holley-hp-efi-conversion.html)

sutphen 30 01-05-2021 11:23 AM


Originally Posted by ICDEDPPL (Post 4771728)
Crank trigger seemed like a paint in the a$$ to move pullies and install on my set up, more expensive too.
Dual sync way easier.
Unless you`re going over 7,000 rpm dual sync will work just fine.

did you cut the snout of harmonic balancer down?thats how I did it then its an easy install

ICDEDPPL 01-05-2021 12:02 PM

I didn`t like that option, still more expensive and unnecessary imop.

Panther 01-05-2021 04:00 PM


Originally Posted by b18cls1 (Post 4771703)
ive been running the hp with a dual sync dist and daytona sensors cdi box for a while now theres documentation out there for it, dosent matter if its a dominator a hp or terminator its all the same setup.

What you're writing is exactly what I'm talking about and they don't have documentation on it. There's no documentation out there on firing a single ignition coil NOT using a CD box and controlling the timing through the ECU.

What you're doing is running a single coil but the CD-1 is firing your ignition using the points output. The HP and Dominator cannot fire a stand-alone coil unless you use a CD ignition OR you have to run a Sniper ignition module.

Panther 01-05-2021 04:02 PM


Originally Posted by b18cls1 (Post 4771704)
what crank trigger you run that clears the lower alt mount?

been thinking of swapping over to a crank trigger from my distributors

36-1 crank trigger

Panther 01-05-2021 04:09 PM


Originally Posted by Rookie (Post 4771713)
Sweet setup!
I jumped the shark a month ago and bought dual sync and coil near plug setups. It wasn't the least expensive way to go, but I believe it was the right way to go.

Thanks! Carbureted it made 960hp and with this stetup it made 975hp out of the gate. I ran a smaller upper pulley to get the boost up and it made just under 1000 hp at 6psi. With a bigger blower it could have done a lot more.

sutphen 30 01-05-2021 06:08 PM


Originally Posted by Panther (Post 4771819)
Thanks! Carbureted it made 960hp and with this stetup it made 975hp out of the gate. I ran a smaller upper pulley to get the boost up and it made just under 1000 hp at 6psi. With a bigger blower it could have done a lot more.

just turn up that correction factor,,easy 1k hp.:D

Rookie 01-05-2021 06:57 PM


Originally Posted by ICDEDPPL (Post 4768055)
You don`t need an additional box to run coils.
HP and Dual sync is all thats needed.(and a couple subharnesses)


Originally Posted by Panther (Post 4771816)
What you're writing is exactly what I'm talking about and they don't have documentation on it. There's no documentation out there on firing a single ignition coil NOT using a CD box and controlling the timing through the ECU.

.
DId you figure this out how to fire a single coil without the box? This is the answer to the question I had a few pages ago.
.

Originally Posted by Rookie (Post 4767988)
I'm going to need some advice on coils and ignition boxes. (do I still need a box if I use the HP computer?)


Originally Posted by ICDEDPPL (Post 4768055)
You don`t need an additional box to run coils.
HP and Dual sync is all thats needed.(and a couple subharnesses)


Originally Posted by Rookie (Post 4768066)
Even if I am not running coil over? Just single coil using the distributor to supply spark.


b18cls1 01-05-2021 07:20 PM


Originally Posted by Panther (Post 4771816)
What you're writing is exactly what I'm talking about and they don't have documentation on it. There's no documentation out there on firing a single ignition coil NOT using a CD box and controlling the timing through the ECU.

What you're doing is running a single coil but the CD-1 is firing your ignition using the points output. The HP and Dominator cannot fire a stand-alone coil unless you use a CD ignition OR you have to run a Sniper ignition module.


https://cimg3.ibsrv.net/gimg/www.off...ce5bc9ea34.gif
I’m sure you figured it out but it’s just a simple Bosch inductive igniter.

Panther 01-06-2021 08:08 AM


Originally Posted by b18cls1 (Post 4771850)
I’m sure you figured it out but it’s just a simple Bosch inductive igniter.

That's correct, there isn't documentation out there from Holley on it. They just assume that you're going to either use a CD Box, GM distributor or coil on plug. They have documentation for the Sniper system for a single coil with no box but not the HP or Dominator. I figured it out on my own a few weeks ago.

https://www.holley.com/products/fuel.../parts/556-150

Panther 01-06-2021 08:10 AM


Originally Posted by Rookie (Post 4771846)
.
DId you figure this out how to fire a single coil without the box? This is the answer to the question I had a few pages ago.
.

Yep, this is the answer; https://www.holley.com/products/fuel.../parts/556-150


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