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 Davis Unified Ignition
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goatwgn
Buffalo

USA
76 Posts

Posted - 29 Jan 2013 :  10:07:58 PM  Show Profile  Reply with Quote
I have a 1975 Pontiac 350 HEI in my '73 455 with 041 cam in my '66 Tempest wagon. It has an older MSD module (without the rev limiter), and an Accel in cap coil. I was considering the Davis Unified Ignition for their custom built advance curve (all I have done to mine is install one "light" and one "heavy" spring to quicken up the rate of advance a little), and installed the adjustable advance can. Have any of you had any real world experience with these, and did they offer any performance and driveability boost?

Phil
The Great White Buffalo

USA
7214 Posts

Posted - 31 Jan 2013 :  11:08:31 AM  Show Profile  Reply with Quote
I have the exact same setup as you with the exception of the adjustable advance can (I have one but never installed it as the current setup works perfectly). I don't think you will see any advantage of spending the money on a DUI compared to what you have now. If you are trying to dial in the advance curve and don't want to play with it ala Jim Hands book, send it to our honorable host, Bill Boyle. He has a distributer machine and knows how to dial in a curve for you. Plus he is quite reasonable and a great guy to work with.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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cortcomp
Coyote

USA
5335 Posts

Posted - 31 Jan 2013 :  12:52:49 PM  Show Profile  Visit cortcomp's Homepage  Reply with Quote
+1 on phil's advice, unless you're perfecting an amazing race setup, bill's curve worked great on my 455/medium compression/XE284
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goatwgn
Buffalo

USA
76 Posts

Posted - 31 Jan 2013 :  2:00:41 PM  Show Profile  Reply with Quote
Thanks guys. I will check that out. I have an extra distributor I might look into sending him.
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goatwgn
Buffalo

USA
76 Posts

Posted - 01 Feb 2013 :  09:02:11 AM  Show Profile  Reply with Quote
Mine is also "medium compression-9.5 to 1 and it is a street car, so I am looking for the best in driveability.
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schoust
Tribal Scout

4 Posts

Posted - 28 Apr 2013 :  10:11:45 AM  Show Profile  Reply with Quote
I run a little differant combo (455 xe284h) and continue to have issues with a slight ping.
What weights are you all running in your Hei? So the Davis set up is supposed to be pre tuned for your application?

Edited by - schoust on 28 Apr 2013 10:14:50 AM
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bigD
Indian Spirit

USA
643 Posts

Posted - 22 Oct 2013 :  11:07:52 AM  Show Profile  Reply with Quote
I've read that a properly set up HEI is all you need up to 6000rpm. A Pontiac friend won several dirt track points championships with an HEI he set up himself. He has also set up dozens of them for local drag and dirt racers. The hi $ MSD stuff is a waste of money IMO.
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Total Jackass
Tribal Scout

0 Posts

Posted - 14 Jan 2014 :  04:18:07 AM  Show Profile  Reply with Quote
Q. Did you hear about what happened at the Laundromat last night?
http://www.coswatches.net/rolex-explorer.html

I'm a first class jerk and don't you forget it!
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 14 Jan 2014 :  6:31:18 PM  Show Profile  Reply with Quote
TTT

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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Dan242tic
Tribal Scout

USA
3 Posts

Posted - 20 Jul 2014 :  2:49:49 PM  Show Profile  Reply with Quote
I bought a new distributor off eBay, had cap,. rotor, ignition unit and all for 50.00 as the one in the car was rusted. I will hopefully be able to rebuild factory one one day. but for 50, couldn't resist. I replaced the ignition with a DUI, using one light and 1 medium spring. Seems to work well. Seems a few thousandths sloppier than I would expect, but seems to work well for the couple of months its on the car

1971 Lemans Sport
1976 400 with 71 TH350
Edelbrock intake with 600 CFM edelbrock. 2 into 2 2.25" exhaust
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 27 Sep 2015 :  09:07:23 AM  Show Profile  Reply with Quote
Did it come with a red cap?

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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