Timing a custom supercharged engine
10-06-2014 | 09:51 AM
#31
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From: Baltimore, MD
can you tell us (me) more about the holley, I just looked up some info on the holley hp. I only thing I have found is efi info.
where can I go to find more about using the holley hp with a carburated set up?
where can I go to find more about using the holley hp with a carburated set up?
10-06-2014 | 12:15 PM
#32
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From: The Woodlands, TX
Joe, with timing control you're just one step closer to the dark side.. 
Once you experience being able to have almost any amount of timing at any rpm and load, you know you're going to want to have the same control of your AFR... And I don't mean having a nice consistent curve, I'm talking about being able to idle at 14 and have it drop to 12.5 the second it goes into gear, then climbing back to 13.5 while you're idling through the no wake zone. Having it rock solid when getting on plane, and being able to command any AFR you choose based on load and rpm. AFR adjusting for coolant, and air temp, while the timing adjusts automatically for air temp as well. Because this is the logical progression, it would be worth considering purchasing a Holley HP ecu and wiring harness. You can use it with your carbs until you're ready to make the inevitable switch. It will do all your timing controls, programmable knock, guardian type system, instead of a buzzer that goes off when you're down to 6#'s oil psi like the factory, you can program it for any pressure you want, fuel pressure, air temp warning, etc. Massive datalogging capacity, IAT, AFR, timing, knock level, coolant temp, oil temp, etc. Wanna try meth injection instead of an intercooler (yes you do) it'll do that too. Then when you're finally ready to give up carbs, you and Mike T can drill some holes in your carb adapters, pick up some universal fuel rails, and buy some throttle bodies. Food for thought...
Once you experience being able to have almost any amount of timing at any rpm and load, you know you're going to want to have the same control of your AFR... And I don't mean having a nice consistent curve, I'm talking about being able to idle at 14 and have it drop to 12.5 the second it goes into gear, then climbing back to 13.5 while you're idling through the no wake zone. Having it rock solid when getting on plane, and being able to command any AFR you choose based on load and rpm. AFR adjusting for coolant, and air temp, while the timing adjusts automatically for air temp as well. Because this is the logical progression, it would be worth considering purchasing a Holley HP ecu and wiring harness. You can use it with your carbs until you're ready to make the inevitable switch. It will do all your timing controls, programmable knock, guardian type system, instead of a buzzer that goes off when you're down to 6#'s oil psi like the factory, you can program it for any pressure you want, fuel pressure, air temp warning, etc. Massive datalogging capacity, IAT, AFR, timing, knock level, coolant temp, oil temp, etc. Wanna try meth injection instead of an intercooler (yes you do) it'll do that too. Then when you're finally ready to give up carbs, you and Mike T can drill some holes in your carb adapters, pick up some universal fuel rails, and buy some throttle bodies. Food for thought...This reply is over the top in completely controlling every aspect of the fuel delivery.
We've certainly come a long way since we were learning how tune our 4779's by reading the porcelain's color and watching the vacuum gauge.
Thanks for the heads up on that fuel controller, it sounds like an awesome piece.
See ya,
Kelly
10-06-2014 | 05:36 PM
#33
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From: bel air, md
Joe, as you have been kicking around the daytona sensors upgrade so have I. Almost pulled the trigger a couple times. I'm glad I didn't. I spent alot of time tunning and working bugs out the last couple of months my main issue was detonation on cylinders 5,6&7. I went through so many plugs I should have bought stock in autolite I'm sure my purchases alone would have got me a return on my investment. I finally did get the detonation taken care of with a 20% mix of race fuel and 93 pump gas. If I had more control over the ignition I think I could do a little better on the percentage. So, with all the blood, swet, tears and curse words over the last couple months I've come to the conclusion that I'd like and ignition that I can control each cylinder individually...
12-28-2014 | 07:39 AM
#34
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From: chicago
Just bringing this thread back up. I found that MSD also makes a box that is programmable as well, and has the Map sensor option.
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
12-28-2014 | 08:39 AM
#35
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Posts: 4,554
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From: Fredericksburg, Va
personally I would stay away from the MSD stuff...seen to many issues, and if/when you go EFI will be useless, as nothing MSD and EFI ecms seem to like each other(RF interferance) but when we were playing with our timing curve, did 15 @ start, then 36 idle thru 3500(had boost here) pulled it back 34..32..then 30 @5200, did not have knock sensors so just making sure no det @ full boost...Rob
12-28-2014 | 09:31 AM
#36
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Joined: Jan 2001
Posts: 4,834
Likes: 2
From: IN
Just bringing this thread back up. I found that MSD also makes a box that is programmable as well, and has the Map sensor option.
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
12-28-2014 | 02:35 PM
#38
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Joined: Jun 2004
Posts: 7,317
Likes: 1,037
From: frankenmuth michigan
Keep in mind too that the conversion for map to vacuum is roughly 3.3" per 10 kpa so IF you did this and wanted to drive the boat tuning with your vacuum/boost gauge if you were crusing at 6.5" vacuum it would translate to 80 map/kpa or so, 10" would be 70 map/ kpa when you go after timing tables based on map/kpa, fwiw, Smitty
12-29-2014 | 12:58 AM
#39
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Joined: Jan 2006
Posts: 688
Likes: 0
From: wisconsin
Just bringing this thread back up. I found that MSD also makes a box that is programmable as well, and has the Map sensor option.
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
http://www.msdignition.com/Products/...ble_6AL-2.aspx
http://www.summitracing.com/oh/parts/msd-6530/overview/
Just to note... MSD NON marine boxes can be sent in to be fixed. Whereas, the Marine ones are filled with some composite material and therefor can't be fixed. So whatever way you guys decide to go please do take that into consideration.. I do Like MSD.... lol
Last edited by Bawana; 12-29-2014 at 01:04 AM. Reason: need to add info
