Why is my 408 a dog down low?
Jan 12, 2007 | 03:06 PM
#41
TECH Junkie
Joined: Mar 2003
Posts: 3,271
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From: Katy, TX
Originally Posted by silverbrick
but if you increase it too much the coil packs will stay dwelling through multiple spark sequences right? say your dwell is 8ms but there are only 7.8ms between sparks? That wouldn't be good... I know there has to be HIGH rpm for this to happen but still. Also with longer dwell your coil pack life is lessened.
A NA LS motor usualy hits peak hp with 29-31* timing at WOT.
Jan 12, 2007 | 03:10 PM
#42
formerly silverbrick (changed 02/17/2013)
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From: Pasadena, Tx
Originally Posted by Snake Eater
GM says the coil packs are good for 200,000 miles at 8ms. Increasing them to @6.5ms may shorten there expected lift to @300K miles, and thats not all that bad. There was a huge write up about dwell increase on the tech. It made a noticable difference when i did it.
A NA LS motor usualy hits peak hp with 29-31* timing at WOT.
A NA LS motor usualy hits peak hp with 29-31* timing at WOT.
Jan 12, 2007 | 03:13 PM
#43
Thread Starter
High on diesel fumes
iTrader: (70)
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From: Phoenix, AZ
Originally Posted by tdrumm
What are the VEs on your cam? I bet that with the 9.5:1 SCR, and a cam of that size, your DCR is in the mid 7 range. I think that could make it sluggish down low.
Originally Posted by Snake Eater
GM says the coil packs are good for 200,000 miles at 8ms. Increasing them to @6.5ms may shorten there expected lift to @300K miles, and thats not all that bad. There was a huge write up about dwell increase on the tech. It made a noticable difference when i did it.
A NA LS motor usualy hits peak hp with 29-31* timing at WOT.
A NA LS motor usualy hits peak hp with 29-31* timing at WOT.
Originally Posted by mds2004
I think the culprit is your motor. It is useless and you may as well pull it out and hand it over to me. I will make it spin for you 
My house needs new wall paper too, so you might as well come and take that too 
Jan 12, 2007 | 03:23 PM
#47
Thread Starter
High on diesel fumes
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Joined: Mar 2005
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From: Phoenix, AZ
The highlighted cell on the table is where I'm at when brake stalling, .64 g/cyl and 2400 RPM. Commanded, based on the spark table, is 27*, actual from the scanner is 24*. I haven't figured out where the other 3* are being lost yet, but actual timing is definitely 24*.
I don't have any logs of a hard launch yet, I just remember the .64/2400
I don't have any logs of a hard launch yet, I just remember the .64/2400