# Detonation ??? **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [April 22, 2007, 11:01am UTC](https://forums.speedlife.net/t/detonation/189438 "2007-04-22T11:01:43Z")\ **Posts on this page:** 1\ **Showing post:** 8
**Author:** ![tom\_vito](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tom_vito/32/6000_2.png) [@tom\_vito](https://forums.speedlife.net/u/tom_vito)\ **Post date:** [April 22, 2007, 4:07pm UTC](https://forums.speedlife.net/t/detonation/189438/8 "2007-04-22T16:07:20Z")
> [@Post Pics from 5/20 Nyspeed BBQ @ Chestnut Ridge](https://forums.speedlife.net/t/post-pics-from-5-20-nyspeed-bbq-chestnut-ridge/29590/129): > > how do you know it’s 36 total? what is the initial set at? in cruise mode you would get surging if it was lean, not pinging or detonating. a couple things just to try would be bump total timing back 2 degrees and try it.or unhook the advance and run it and see what happens. the next couple things are just ideas for ya if you wanted to try it. 89 octane, recurve kit in dist. i always use the lightest springs to get timing in the earliest. also change the vacuum advance canister to one with less advance in it. if the one you have is 20 you could try a 15 or something. I guess 36 sounded good…😕 LOL Initial is set at 12, no surging so I guess I can skip that. I will try backing that up tomorrow. I will unplug and cap off the advance hose before work and see what happens. Have tried the higher octane fuel, without any success. How do you know how many degree advance canister you have? --- _[View the full topic](https://forums.speedlife.net/t/detonation/189438)._