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PostPosted: Tue Jun 14, 2022 5:43 pm 
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Turbo Slant 6
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Joined: Sat Sep 13, 2014 8:25 am
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Location: Springtucky OR
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My turbo project is coming along pretty well. While tuning I've been limiting it to no more than 3 PSI of boost. Now I'm getting ready to run it into some higher boost levels and I'd like some more experienced slanters to check my timing table. What would you change?

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PostPosted: Wed Jun 15, 2022 3:37 am 
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Joined: Mon Oct 21, 2002 11:08 am
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Location: Blacksburg, VA
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I am pretty conservative with timing since I drive long distances and race and want reliability. The turbo Dart is a real street car. I have mine set to 18 deg at 8 psi and higher boost, and tapering smoothly to about 28 deg at 100 kPa. I run about 22-23 deg at 6 psi, which gets me into the high 13s in the quarter (runs 16s w/no boost). I have run up to 14 psi and made just under 400 crank HP (mid/high 12s in a 3250 lb racewt car). This all works well with pump premium fuel, but I add a few gallons of 110 octane when racing all day at a track running over 8 psi.

I have used the MSD 6530 digital programmable with MAP sensor for timing programming so far, but will likely move to MS3 or MSpro on my boosted car in the near future. Probably I am leaving plenty of HP on the table, and would also like to hook up a knock sensor to get closer to "the edge."

Hope this helps!

Lou

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PostPosted: Wed Jun 15, 2022 3:43 pm 
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Joined: Wed Nov 06, 2002 1:57 pm
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Location: Everett, WA
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The turbo slants on fabo, only run 20* max and sometimes lock the distributor. I believe this is "reveled knowledge" and nobody knows what they are doing.


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PostPosted: Thu Jun 16, 2022 8:07 am 
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Turbo Slant 6
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Thanks guys. I think I will back a few degrees out of the lower and middle boost ranges

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PostPosted: Thu Jun 16, 2022 11:08 am 
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Turbo Slant 6
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I've adjusted ignition timing in the low and mid boost areas, edited it a bit around the idle. Also, I increased advance in the low RPM area of the table that the motor never sees with the idea that it might help smooth out interpolation near the edge of that area.

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PostPosted: Thu Jun 16, 2022 4:21 pm 
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You could do what they appear to do with the hemi. Run maximum advance and let the knock detector adjust it.


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PostPosted: Fri Jun 17, 2022 8:56 am 
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What do you read in the chart? The Green? Learn me please. Thanks :D :D

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PostPosted: Sat Jun 18, 2022 8:37 pm 
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Turbo Slant 6
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Location: Springtucky OR
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kesteb wrote:
You could do what they appear to do with the hemi. Run maximum advance and let the knock detector adjust it.

Knock sensor isn't configured yet. I expect quite a learning curve when I get to that. By most accounts knock sensor input can be tricky. Especially on an engine that has a lot of mechanical noise already.

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PostPosted: Sat Jun 18, 2022 8:43 pm 
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Turbo Slant 6
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Location: Springtucky OR
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Rick Covalt wrote:
What do you read in the chart? The Green? Learn me please. Thanks :D :D

The colors don't really mean anything.
The horizontal scale is RPM (obviously). The vertical scale is manifold pressure in kpa. 100 kpa would equal wide open throttle on a naturally aspirated engine. 200 kpa is roughly 15 psi of boost.The numbers in the table are degrees of ignition advance.

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