Highest timing at idle.
05-19-2007, 05:11 PM
#1
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Highest timing at idle. I have a very slight miss at idle and can't get rid of it. Off idle like 900rpm (I idle at 800) its gone, only at idle do I hear it. I know I need to advance timing at idle to increase the pressure in the cylinder to help rid of it, but how far can I go and still be safe? Right now im sitting at 21.5 at idle. What are ya'll sitting at during idle?
05-20-2007, 07:03 AM
#2
You can increase your idle timing as far as you need to but keep in mind, your timing overspeed/underspeed control will have less affect on your engine if your base timing is in the upper 20s or above.
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2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
05-23-2007, 08:05 AM
#3
Moved from Advanced Tech.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
05-23-2007, 10:13 AM
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If you're running a stock internals motor, then I'd use the stock tables. Chances are (in that scenario) it's a mechanical issue - not a tuning issue. If you're running a cam, I've found that I need to take 4~6* of timing out in areas under 1600 rpm. If you're cammed, I could send you my timing table for a reference.
05-23-2007, 11:45 AM
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Originally Posted by SSpdDmon
If you're running a stock internals motor, then I'd use the stock tables. Chances are (in that scenario) it's a mechanical issue - not a tuning issue. If you're running a cam, I've found that I need to take 4~6* of timing out in areas under 1600 rpm. If you're cammed, I could send you my timing table for a reference.
05-23-2007, 12:15 PM
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Originally Posted by jub jub
That's strange. I find my car idles smoother and revs faster with more advance - 26* or more.
05-23-2007, 12:31 PM
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Originally Posted by SSpdDmon
Idle, yes - 26 or more is a good number for cam'd M6 cars. Just off idle when you're letting the clutch out - not necessarily. I'm talking about removing timing from the less than ~1600 rpm, but greater than .28 grams/cylinder region of the high octane table for off idle issues. That's where I have typically seen a problem in the tune on a cam'd car.
