My combination is similar to yours, the details are on my webpage.
The stock EEC ignition curve is a poor compromise for an Incon and all other turbo systems.
I've sampled base timing between 5* to 10*, and know the shortcomings of each.
I can run 5* base on 91 octane (the highest available here) safely at 9# boost in 100* heat. But, the engine is not as crisp and responsive at lower rpm's at this setting. Power at high rpm is also lacking.
If I set base to 10*, I experience detonation at 3000rpm under the same conditions. But, the engine is much more responsive off idle, and the increased power above 4500rpm is noticeable.
Turbo engines need a timing curve that reduces mid-range advance while leaving the low and high speed timing alone. I suggest you contact Brian Renegar (his link is on my page) to see the progress he's made in solving this.
Unless you have a Tweecer, custom chip, or other method to modify your timing curve, don't make the same mistakes I've made -- be safe and begin your tune conservatively.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
89 GT conv., Incon 800 turbo