and zero the map out for now. 
Base tune?
Base tune? Ok so up until now I have been using the MSD 6010's timing pills and haven't noticed the difference between 1,2, and 3....now I wanna try doing some custom timing maps tommorrow so I wanna see what you guys got as far as info on where to start at...it's a 10:1 5.3 with corvette cam (01-03 12561721 198/207 .467/.479 116), 799 (243) heads, f body manifolds, edelbrock dual plane intake with 650 proform double pumper...I just need somewhere to start...oh yea and I do have a map sensor...not sure if I should unplug it and concentrate on the timing first then add map sensor or just tune them at the same time...
this is just a start but it should be closeish
put a dot where the rpm is for the timing
rpm timing
500 12
800 23
1500 33
5200 30
6000 32
id set your high limiter somewhere below 6500, prolly fall off around 6-6300..
get your map hooked up and figure out your wot psia, cruising psia, and idle psia then report back and ill give ya some numbers to try.
put a dot where the rpm is for the timing
rpm timing
500 12
800 23
1500 33
5200 30
6000 32
id set your high limiter somewhere below 6500, prolly fall off around 6-6300..
get your map hooked up and figure out your wot psia, cruising psia, and idle psia then report back and ill give ya some numbers to try.
That timing is close to what I have on a 13:1 383ci motor. I run a max of 34.initial timing is 10 at start up then by 2000 rpms it's all in.
28-34 seams to be the general timing limit most people run.
28-34 seams to be the general timing limit most people run.
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Still haven't got to it...after trying to bring it up to 5500 rpm I don't think it likes pill 3 that's for sure, then again maybe I shouldn't run 87 lol...I'm gonna try running without the map sensor when I tune it tomorrow...
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well my car is an bracket car,, I run 40 deg from 2000 and up in rpms,,, that's where it has run best but also mine is a stock long block 6.0... I run 35 at 2000 with 150 shot ,, seems to like it but its on race gas 110,, just motor has 93 pump in it,,, I think you will have to find your motor sweet spot,,,
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From: Harford Co. Maryland
well my car is an bracket car,, I run 40 deg from 2000 and up in rpms,,, that's where it has run best but also mine is a stock long block 6.0... I run 35 at 2000 with 150 shot ,, seems to like it but its on race gas 110,, just motor has 93 pump in it,,, I think you will have to find your motor sweet spot,,,
(<--my head) How the hell you not rattling the bottom end out of it ?
well my car is an bracket car,, I run 40 deg from 2000 and up in rpms,,, that's where it has run best but also mine is a stock long block 6.0... I run 35 at 2000 with 150 shot ,, seems to like it but its on race gas 110,, just motor has 93 pump in it,,, I think you will have to find your motor sweet spot,,,
Don't forget ,the pills have the base line map added. In other words , add 20* to the chart for what you have been running. Mine likes 34* by 1600, holding till 3200, then dipping down to 30*by 3500 and carrying till 4200, then taper up to 34* by 4500 and hold it to redline. A couple degrees less timing at max torque will net a tad more power. The engine is most efficient at max torque and requires less timing to make power.
It def didn't like 32* of timing up top, felt lazy...and still breaking up at 5500...and I filled it with 93 to make sure I wasn't pinging, I'm gonna do some more messing around tommorrow...I left the map sensor on which may have something to do with it...
Yea I put the rev limit at 6000rpm...the map curve was only set at 5* at the higher manifold pressure...it has been breaking up over 5500rpm since day one, I thought maybe the pills added too much timing so I backed it off from the preset 35+* timing up top but that didn't help, and being the carb is a double pumper with decent jets I think it may be valve float like zonerRS had indicated to me before, being a stock corvette cam I thought I would be good for at least 6k, but the springs were "low mile" units that for all I know have a million miles, so $65 ls6 springs may be in my future even though the cam has less than .500" lift, but I don't think the higher spring pressure will hurt me being ls6 springs aren't super stuff like say comp 918s...
I had a similar issue and it was the plugs. They may look alright but could be lean fouled, etc. I switched from my fouled tr55s to a set of tr6s and haven't had the problem since. Your results may vary. But check and replace the plugs anyways. They could look fine but be jacked. Hope this helps, Eric L
I had a similar issue and it was the plugs. They may look alright but could be lean fouled, etc. I switched from my fouled tr55s to a set of tr6s and haven't had the problem since. Your results may vary. But check and replace the plugs anyways. They could look fine but be jacked. Hope this helps, Eric L
Ok good call, I probably should check them anyway since they were a set of "new" plugs I got in a package deal with some other parts, which they looked new but like you said who knows...
Also I haven't pulled them since I have had the car up and running, and after 450 miles its probably good that I do anyway just to see where I'm at fuel adjustment wise...not sure how you would read the tips of iridium plugs though bc they are so small on the tip
Also I haven't pulled them since I have had the car up and running, and after 450 miles its probably good that I do anyway just to see where I'm at fuel adjustment wise...not sure how you would read the tips of iridium plugs though bc they are so small on the tip
