stock timing?

[Loochy88]

what exactly should i be seeing for the stock timing at idle. im running platinum spark plugs, and a maft that as far as i know is set at the stock settigs. i ran an autotap scan at idle i was seeing a max of 33* at idle and a low of about 27*. how far off is this? i dont have the enhanced parameters, but im looking into buying them to see if im getting any knock.

[ October 02, 2005, 12:13 AM: Message edited by: Loochy88 ]

[1DangerousV6]

25* - 27* would be about right for idle..33* seems a few too high..but it depends exactly at what rpm your car is idling if it goes up and down at all..i wouldnt imagine you'd be getting any knock at idle

[98Camaro3.8]

Mine sits somewhere around 5°, but it's all over the place....as high as 13° and as low as -2°. Having a hard time with the lope from the cam, I guess.

[Loochy88]

i played with some stuff, now it's idling right around 25-28. so i guess thats about right based on what dangerous said.

i noticed that on autotap it always reads out as "-25" instead of "25"

why is this.

i also noticed that as i give it more gas (i did a scan driving around tonight) the timing will go down... it would get as low as "-22" or "-18" when i put it into the throttle, but then when i let up it would shoot to around "-40" and then settle around "-28" ish while i coasted. This seems counter intuitive to me. Shouldnt there be more advance when the engine is running faster, or am i missing something.

[98Camaro3.8]

When you let off the gas, you'll get tons of advance for a short period of time, then it'll settle back to normal. You have to consider the amount of airflow in addition to RPM.

Here's the stock timing table from my car:
http://www.leadingedgesim.com/mkapro...tockTiming.jpg
That's just the standard high octane table, there's also 2 other ones that could be used.

Mine idles at around 180-190 Mg/cyl. According to the table, it should be 15° advance. +/- 8° can be added to that for corrections in idle, though.

Originally posted by Loochy88:
i noticed that on autotap it always reads out as "-25" instead of "25"

why is this.

Autotap is showing timing relative to TDC. Negative numbers being BTDC. Other ways of viewing it assume BTDC, so negative would be ATDC.

[ October 03, 2005, 12:26 AM: Message edited by: 98Camaro3.8 ]