As title says, who has experimented with trying to gain tractin by pulling spark. With the LTR set-up it is pretty easy to spin your tires. I have thought about pulling spark in the lower regions of the spark table at the higher map values to help with the problem. I have a manual tranny so I am not worried about a converter spooling up or anything of that sort. Less spark could mean less efficient and less power. Who all has done this?

 

Helped with my peg leg rear. I had no choice when even lightly getting on the throttle it would spin. Now I've got my posi in I have put it back to the original table.
It did help me from 2400 down I took out around 6 in most areas.
I didn't really optimize it and it did result in some surging because of that when cruising.

 

Having a spark retard, based on VSS, and %TPS is a good idea. IMO.
A better answer is using a delta VSS, thou, but that gets more complex code wise.
GM has done traction control, using timing. If you look at the Tunercat LS1 editor there's a table for it.

 

It can be done but what works even better is having a progressive throttle. It depends on the application. If you're spinning the tires at low throttle openings then you're using too much throttle. Sometimes, especially with older chevy's, it's hard to get much feel just off idle. In this case I recommend FIRST looking at correcting the throttling problem. In an ideal world torque would be linear to your throttle position but with butterfly's and older lever action (not cammed) throttle bodies it is far from ideal.
Installing a cam helps so that large initial pedal travel only opens the throttle a little bit.
Cutting spark works good for drag cars or if you can't do much to the throttling setup.