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Registered User
Join Date: Jun 2005
Location: Birmingham, Alabama
Posts: 276
Originally Posted by RClewett View Post

The accuracy of a high resolution ignition system come from the number of points on the crank trigger. Most of the aftermarket systems available don't have the processing power for the high massive amounts of data generated by the 60 minus 2 input.

I mis-interpreted your post and thought you were referring to higher resolution than 60 minus 2 which I am familiar with.

Thanks for replying.

Old 04-28-2010, 09:23 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #41 (permalink)
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Join Date: Dec 2006
Location: Idaho
Posts: 5,624
Originally Posted by 911st View Post

Excellent info in post 37! Thank you.

Great points.

Apx -20 on boost. One dyno -18 to -23 seems range.

Maybe one more deg for 1 bar.

Apx -2 deg more advance with twin plugs.

Heat in the cylinder from ideal AFR helps ignition.

Can I beg you for:

Recommendations as to timing for a more stock 930 from idle to 3000rpm 'if there were no boost'?

About how much more power are you seeing with twin plugs? I had heard about 3% on a NA motor from just the earlyer advance it runs.

The best.
I think you meant to say about 2 degrees less timing advance with twin plug ignition.

I am also curious what about the influence of RPM on twin plug timing variance from single plug. Is this plus or minus?
Sapere aude
1983 3.4L 911SC turbo. Sold
Old 04-28-2010, 02:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #42 (permalink)
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Join Date: Apr 2010
Location: California
Posts: 15

More boost, less timing. A reasonable place to start is 20 degrees at 1 bar.

The most noticeable benefit from twin plug is improved torque. Top end power is about right at 3% to 5%. Every engine is a little different.

Give me a call about the timing curve, 310-406-8788 M-F 9-4 PT. I need some more information.

Old 04-28-2010, 10:54 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #43 (permalink)

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