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Billy Boats - that's how they all work. It's physics.
Better words. With a distributor, once your pick up is triggeredm you can only delay time (or send close to real time) to send electricity to the spark plug. You can't really send electricity to the plug before the pick up is triggered. So again, any electronic box with a timing curve only does so by retard degrees. Works out the same way, so no biggie really. Just helps to understand how it really works....as you have found out. |
Originally Posted by SB
(Post 4268109)
Billy Boats - that's how they all work. It's physics.
You can delay an action based on something that already happend but you can't advance an action based on something that already happened before that something happened. ie: timing trigger to when the plug fires. |
Running a MAP sensor with this ignition is the way to go with a blower. While dyno tuning my new engines I found that at WOT (6500 rpm) my engines make best power and lowest EGT with 34 degrees of timing. But at Peak torque and high load situations 34 degrees was detonating. Now with the MAP sensor the Daytona box reads boost and rpm and adjusts timing accordingly.
Example. Idle in canal, under 1200 rpm , in vacuum 38 degrees Rolling onto plane, 3000 rpm , 4 lbs boost , high engine load, 26 degrees Cruising up on plane, 4000-5000 rpm 0 boost. 36 degrees At this point as the load on the engine increases the timing retards These are not actual statistics of my timing table , there are 128 data points to fill in to program this table and the ignition box fills in the rest |
Originally Posted by billy boats
(Post 4268188)
Running a MAP sensor with this ignition is the way to go with a blower. While dyno tuning my new engines I found that at WOT (6500 rpm) my engines make best power and lowest EGT with 34 degrees of timing. But at Peak torque and high load situations 34 degrees was detonating. Now with the MAP sensor the Daytona box reads boost and rpm and adjusts timing accordingly.
Example. Idle in canal, under 1200 rpm , in vacuum 38 degrees Rolling onto plane, 3000 rpm , 4 lbs boost , high engine load, 26 degrees Cruising up on plane, 4000-5000 rpm 0 boost. 36 degrees At this point as the load on the engine increases the timing retards These are not actual statistics of my timing table , there are 128 data points to fill in to program this table and the ignition box fills in the rest We found on my 598 41* made best power on dyno I run it at 39* in the boat. I cranked the timing up to 45* at idle turns it in to a ***** cat and lowers cylinder pressure makes the exhaust much quieter. |
Originally Posted by 14 apache
(Post 4268301)
Does it have knock sensor?
We found on my 598 41* made best power on dyno I run it at 39* in the boat. I cranked the timing up to 45* at idle turns it in to a ***** cat and lowers cylinder pressure makes the exhaust much quieter. |
Originally Posted by Black Baja
(Post 4268351)
Was this with 93 pump gas?
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Originally Posted by 14 apache
(Post 4268301)
Does it have knock sensor?
We found on my 598 41* made best power on dyno I run it at 39* in the boat. I cranked the timing up to 45* at idle turns it in to a ***** cat and lowers cylinder pressure makes the exhaust much quieter. And there is one of many benefits of programmable ignition.
Originally Posted by 14 apache
(Post 4268115)
He did a good job in my eyes. Put the timing at idle to 45* smooth's things out very good. Just pull it out fast as RPM comes up.
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Was just looking at the EFI there is 961 cells for timing and fuel management.
THAT WAS ON A HOLLEY DOMINATOR ECM. The fast ECM has about half. |
I too am thinking about purchasing these to replace my current setup. Which is a locked MSD pro billet dist, with crane boxes. The crane boxes have been great, and I have had no issues with the engines as far as detonation or anything. However, the start retard, additional timing at idle, and being able to customize the curve esp with the map sensor, is a total win all the way around.
Billy Boats, I'll give you a shout this week to catch up on things and talk more about your setup. |
Originally Posted by 14 apache
(Post 4268301)
Does it have knock sensor?
We found on my 598 41* made best power on dyno I run it at 39* in the boat. I cranked the timing up to 45* at idle turns it in to a ***** cat and lowers cylinder pressure makes the exhaust much quieter. |
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