6.0 Tuning (timing) questions
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From: The Confederacy
6.0 Tuning (timing) questions Ok, this is on a 2003 Silverado SS 6.0 that I'm working on. Here's what is done so far. Headers, 3,000 stall, cold air intake, Patriot stage II 6.0 heads, MTI B1 221/221 .558/.558 114lsa cam, no cats, magnaflow muffler, and a shift kit in the trans. I have the idle and part throttle driving really really good on this truck. After deleting the torque management and setting the timing as follows The truck is running MUCH better.
.60g/cyl to 28* from 3200 and up,
.64 to 28* from 3600 and up
.68 to 28* from 4000 and up
.72 to 28* from 4000 and up
.76 to 28* from 4000 and up
.80 to 28* from 4000 and up
.84 to 28* from 4000 and up
Now, my question is.. when I bring the truck up on the stall and launch it feels a little "soft" until it reaches 4000rpm. Looking at my logs when I do this I see that the converter flashes to around 3000rpm or so and at that point I only have 19* of timing... then when I get up to 4000rpm where I hit my higher timing tables it takes off. I did some figuring today and here is my g/cyl and timing for a "launch"
3000rpm .71g/cyl 19*
3370rpm .72g/cyl 19.5*
3625rpm .75g/cyl 19.5*
3800rpm .76g/cyl 23*
3900rpm .82g/cyl 24.5*
Above that point I get into the higher timing. how much timing are you guys running in the lower RPMs (2800 to 3800rpm) at the .60g/cyl to .88g/cyl area? If I jack that timing up some, will that make it leave harder?
Thanks for reading my long post.
Scott
.60g/cyl to 28* from 3200 and up,
.64 to 28* from 3600 and up
.68 to 28* from 4000 and up
.72 to 28* from 4000 and up
.76 to 28* from 4000 and up
.80 to 28* from 4000 and up
.84 to 28* from 4000 and up
Now, my question is.. when I bring the truck up on the stall and launch it feels a little "soft" until it reaches 4000rpm. Looking at my logs when I do this I see that the converter flashes to around 3000rpm or so and at that point I only have 19* of timing... then when I get up to 4000rpm where I hit my higher timing tables it takes off. I did some figuring today and here is my g/cyl and timing for a "launch"
3000rpm .71g/cyl 19*
3370rpm .72g/cyl 19.5*
3625rpm .75g/cyl 19.5*
3800rpm .76g/cyl 23*
3900rpm .82g/cyl 24.5*
Above that point I get into the higher timing. how much timing are you guys running in the lower RPMs (2800 to 3800rpm) at the .60g/cyl to .88g/cyl area? If I jack that timing up some, will that make it leave harder?
Thanks for reading my long post.
Scott
What are some of you guys running in your 2000 to 3800rpm tables for .6g/cyl and up???? 
you may be able to advance it a few degrees before you run into KR. There is a happy medium to be had you just need to find it. When it starts knocking then you have gone too far. I hope this helps.
Jeremy Formato
Jeremy Formato
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Joined: Oct 2003
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From: Central, MA
Here's my '04 Silverado SS's HO timing table.
It's not NEARLY as agressive as yours in the upper RPM range... I stuck with the stock "theme" of dropping a few degrees up top, but I upped the values by 3-4 degrees if I recall correctly.
I also filled in the "hole" in the ~36-52 g/cyl / 1600-2600 rpm range. It was very noticeable in the 2D line graph... Thread on this, over here.
Other than that, it's pretty much stock.
I get KR... and I haven't had time to nail down exactly where I'm getting it, so I haven't spent a whole lot of time working with this table.
It's not NEARLY as agressive as yours in the upper RPM range... I stuck with the stock "theme" of dropping a few degrees up top, but I upped the values by 3-4 degrees if I recall correctly.
I also filled in the "hole" in the ~36-52 g/cyl / 1600-2600 rpm range. It was very noticeable in the 2D line graph... Thread on this, over here.
Other than that, it's pretty much stock.
I get KR... and I haven't had time to nail down exactly where I'm getting it, so I haven't spent a whole lot of time working with this table.
