XDF lesson learned

[Blue71]

Been following this post and on thirdgen.org
http://www.thirdgen.org/techboard/diy-prom/452500-what-timing-car-seeing.html

I've been working on my timing tables just could seem to get it right,
Had timing set to 10* at the distributor, Had main spark bias set at 10*in the bin
Datamaster was showing 10* at Idle but only 19* at wide open throttle.
Add 10* a across the board in the main spark table, how it like I just hit it with a 100
shot of nos.

Moral to the story always verify with a timing light !

[91chevZ71]

good to hear it worked out. I feel your pain- nice to actually have it runs like it should

[94Blazer383]

You distributor should be set to whatever your initial SA is set to in your tune. The main spark bias value is actually subtracted from your spark table across the board. So if your main spark bias is 10* and you zero it out it will be like advancing your timing 10*.

I have my dis. set to 0*, initial SA is 0*, main spark bias is 8*. I think it was like 9.84* from the factory.