Offshoreonly.com

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Holley EFI/DIS Conversion (https://www.offshoreonly.com/forums/general-q/327133-holley-efi-dis-conversion.html)

MER Performance 06-10-2015 05:46 AM

RAGE,
I'm very happy to see a change in technical content here. I know; this threads subject is DIS, so I don't want to get off topic. I have 2 525EFI builds coming up, that are total rebuilds, I will be converting to the Holley HP EFI.

BUP 06-10-2015 11:34 AM

following along so in post # 19 are you talking about Wilson as in

www.wilsonmanifolds.com

they use to be the ticket for a lot of drag cars using their intake manifolds

DesertRage 06-10-2015 11:34 AM

Thanks Guys!

MER, Your 525EFI conversion projects sound awesome. Will you be able to reuse the Merc cam and crank sensors? I looked at using those parts, but my block is a Dart (MK IV).

DesertRage 06-10-2015 11:39 AM


Originally Posted by BUP (Post 4315718)
following along so in post # 19 are you talking about Wilson as in

www.wilsonmanifolds.com

they use to be the ticket for a lot of drag cars using their intake manifolds

That's the place. They do a lot of EFI intake conversions.

Black Baja 06-10-2015 12:32 PM

Does the Holley ignition have the capabilities to run different timing in different cylinders?

DesertRage 06-10-2015 12:52 PM


Originally Posted by Black Baja (Post 4315755)
Does the Holley ignition have the capabilities to run different timing in different cylinders?

If your running coil packs you can individually adv/retard ignition by .1 deg increments. You can also set individual cylinder fuel trim.

Black Baja 06-10-2015 01:00 PM


Originally Posted by DesertRage (Post 4315766)
If your running coil packs you can individually adv/retard ignition by .1 deg increments. You can also set individual cylinder fuel trim.

Wow! That's sweet. Can't tell you how many times I've had 1 or 2 trouble cylinders and the rest were fine. That system is where it's at...

260Velocity 06-10-2015 02:25 PM


Originally Posted by DesertRage (Post 4315720)
Thanks Guys!

MER, Your 525EFI conversion projects sound awesome. Will you be able to reuse the Merc cam and crank sensors? I looked at using those parts, but my block is a Dart (MK IV).

yes, if you had a cam sensor along with a crank sensor you could run sequential injection. (I have done some research on MEGA Squirt systems for my supercharged Mustang) that would clean up the bottom end even more. I am By far no expert on these HAHA
I know on the cars alot of guys run either 8 EGTs and or 8 wide band O2s. this is the easiest way to tune individual cylinders (either with timing or fuel) if you are having distribution issues in cylinders. So educate me as i am getting back into the boat scene from a 7 year absence. Where are you placing the wide band to collect the average Bank AFR? Is it just past the manifold on the riser? i am running IMCO power flow on my boat. (please don't judge they came with it).

The next question is how can you possibly check each cylinder to adjust your timing or fuel individually with wet Manifolds or headers?? each exhaust tube would need their own EGT or O2 sensor... Just Curious.

Black Baja 06-10-2015 03:07 PM


Originally Posted by 260Velocity (Post 4315810)
yes, if you had a cam sensor along with a crank sensor you could run sequential injection. (I have done some research on MEGA Squirt systems for my supercharged Mustang) that would clean up the bottom end even more. I am By far no expert on these HAHA
I know on the cars alot of guys run either 8 EGTs and or 8 wide band O2s. this is the easiest way to tune individual cylinders (either with timing or fuel) if you are having distribution issues in cylinders. So educate me as i am getting back into the boat scene from a 7 year absence. Where are you placing the wide band to collect the average Bank AFR? Is it just past the manifold on the riser? i am running IMCO power flow on my boat. (please don't judge they came with it).

The next question is how can you possibly check each cylinder to adjust your timing or fuel individually with wet Manifolds or headers?? each exhaust tube would need their own EGT or O2 sensor... Just Curious.

All you do is make a spacer flange to go between the head and exhaust manifold and put your sensors right at each port.

MER Performance 06-10-2015 06:05 PM

1 Attachment(s)

Originally Posted by 260Velocity (Post 4315810)
yes, if you had a cam sensor along with a crank sensor you could run sequential injection. (I have done some research on MEGA Squirt systems for my supercharged Mustang) that would clean up the bottom end even more. I am By far no expert on these HAHA
I know on the cars alot of guys run either 8 EGTs and or 8 wide band O2s. this is the easiest way to tune individual cylinders (either with timing or fuel) if you are having distribution issues in cylinders. So educate me as i am getting back into the boat scene from a 7 year absence. Where are you placing the wide band to collect the average Bank AFR? Is it just past the manifold on the riser? i am running IMCO power flow on my boat. (please don't judge they came with it).

The next question is how can you possibly check each cylinder to adjust your timing or fuel individually with wet Manifolds or headers?? each exhaust tube would need their own EGT or O2 sensor... Just Curious.

Thats correct, or you can make a spacer plate, between head and header. I spoke with Dustin W about this, the wide bands are very expensive. I run a 8 pack wide band on the dyno and take an average at the collector using the Holley wide band , my 8 wide bands are in my dyno headers

.[ATTACH=CONFIG]542013[/ATTACH]


All times are GMT -5. The time now is 02:04 PM.


Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.