odd timing issues, not getting full advance
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
odd timing issues, not getting full advance there is no KR, high and low octane set the same, its a 99 SS, all the correction tables do not have a factor on this as they are zeroed in those areas.
once the car goes past about 5800 rpm the timing goes from 28* down to about 26.5*, wtf? it should stay at 28*, any ideas?
once the car goes past about 5800 rpm the timing goes from 28* down to about 26.5*, wtf? it should stay at 28*, any ideas?
I'm having similar issues with a car i'm tuning.. but it is ADDING 2-3 degrees and I haven't figured out where it is coming from.
I guess I could zero out the correction tables one by one until I find it.. hopefully.
I guess I could zero out the correction tables one by one until I find it.. hopefully.
Correction tables:
ECT
IAT
EGR
TCS
Torque management
fuel mixture spark correction,
and don't forget about the multipliers that factor by RPM too.
So what happens if you bump the timing up to 30* in the table?
do you then see 28* on the scan?
ECT
IAT
EGR
TCS
Torque management
fuel mixture spark correction,
and don't forget about the multipliers that factor by RPM too.
So what happens if you bump the timing up to 30* in the table?
do you then see 28* on the scan?
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
Originally Posted by white2001s10
Correction tables:
ECT
IAT
EGR
TCS
Torque management
fuel mixture spark correction,
and don't forget about the multipliers that factor by RPM too.
So what happens if you bump the timing up to 30* in the table?
do you then see 28* on the scan?
ECT
IAT
EGR
TCS
Torque management
fuel mixture spark correction,
and don't forget about the multipliers that factor by RPM too.
So what happens if you bump the timing up to 30* in the table?
do you then see 28* on the scan?
like i said, all mult table are zeroed out in the area this happens. and i havent touched the wot timing yet beucase we havent had the car out for a log recently.
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Is white2001s10's list a complete listing of ALL timing modifiers? There shouldn't be any way for the PCM to change timing if all the modifiers are zeroed out. I didn't see any mention of knock retard, but do the logs look clean? Even for knock <1?
BTW, you run into some wierd problems man.
BTW, you run into some wierd problems man.
I had the same problem until I looked at the burst knock...I just set it so that it only pulls timing for Burst knock from a BIG surge of air. See what your burst knock settings look like, and see how much timing is being pulled (look at a timing histogram, and see what the difference is between the high and low point values).
Hell, you have my file. Do a compare and see.
Hell, you have my file. Do a compare and see.
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
ok will do, he has the same burst knock tables as i do so i dont see why it would do that, but who knows, if there is a weird tuning problem, i think i have seen it lol
I don't think it is so much weird as it is the fact that you just look at this stuff more often and actually notice the crap that other people just don't take the time to.
Thread Starter
Joined: Mar 2003
Posts: 8,319
Likes: 1
From: North Carolina
burst knock seemed to fix it, still is off at times by 1/2 a degree but i think thats just in the rounding in the octane tables. that wouldnt add timing though. check you correction tables out
i am curious as to what values you used in yr burst knock.
i have a 1998 and the value is .020 but the range says 0.0 to 8.0
i know 1999+ cars have a range of values for the rpm..but 1998s only have 1 number to use throughout the rpm range.
what does yr burst numbers look like now?
i have a 1998 and the value is .020 but the range says 0.0 to 8.0
i know 1999+ cars have a range of values for the rpm..but 1998s only have 1 number to use throughout the rpm range.
what does yr burst numbers look like now?
TECH Fanatic
Joined: Mar 2002
Posts: 1,169
Likes: 0
Originally Posted by WS6FirebirdTA00
burst knock seemed to fix it, still is off at times by 1/2 a degree but i think thats just in the rounding in the octane tables. that wouldnt add timing though. check you correction tables out