Pulling timing

[minytrker]

After the CNC work on my heads my car is flowing a lot more so I started to re-tune it. Im losing 5 deg of timing at wot when before I wasnt. I am hitting alot of new cells now because of the more air but still, Im loosing timing at 5500rpm and .88g/cyl. What could be pulling timing, I found 2 deg from IAt but cant find the other 3.

[minytrker]

I have checked all the most common causes.

[ringram]

Aspark? Bkr?

[minytrker]

0 kr

[VYSSLS1]

monitor - burst knock retard

[minytrker]

monitor - burst knock retard

Thanks alot... thats what it was. I played with it for a couple of hours and ended up zeroing it out. With BK baically turned off from 3600rpm on up I get 0.0 deg of KR and my wot timing is now what it should be. Can I leave it like this or is it hurting anything? I have 26 deg at wot at .96 grams/cyl. I never had an issue till I had the heads worked and started seeing more grams/cyl.

[VYSSLS1]

Thanks alot... thats what it was. I played with it for a couple of hours and ended up zeroing it out. With BK baically turned off from 3600rpm on up I get 0.0 deg of KR and my wot timing is now what it should be. Can I leave it like this or is it hurting anything? I have 26 deg at wot at .96 grams/cyl. I never had an issue till I had the heads worked and started seeing more grams/cyl.

ah no worries as long as its all ok, yeah the first time i cam across this exact prob you had, it had me stumped for a little bit as well.

[joecar]

VYSS,

Welcome to the forum mate (I should have picked up on this in the other thread).

[Dirk Diggler]

B KR is preemptive if the PCM sees large changes of air (especially spikes in the VE table when in SD mode ) it will pull timing before it actually happened

[VYSSLS1]

VYSS,

Welcome to the forum mate (I should have picked up on this in the other thread).

Joecar, im not new to the forum been here a little while now

anyway ill take this opertunity to say hi to all on here.

Cheers Brad.