Yes and no. If you hear pinging, you'll have to retart the timing until you don't hear pinging anymore. You can actually retart the timing far enough to where you can use 87 octane and not get pinging. But you lose out on some of the benefits of the DiabloSport Preformance Tune.Seraphitia102 said:so if i just installed the stock diablo tune, I still need to use 91 octane right?
propellerhead said:........ I have no idea what the actual timing is in degrees. This seems to be a mystery in the DiabloSport Predator world and I can't get a decent answer. .
hotrodnut said:I haven't messed with the timing yet but couldn't you see the effects of the changes you make by doing a before and after reading using the real time data that the Predator is capable of?
I ran the real time data before I installed the Performance Tune to get a before and after. I even let it idle until the fans kicked on so I'd know what the factory settings for those were before I made the settings I liked.
I asked Tech Support about that. They pointed out that there's a data log parameter called SPARKADV. I've collected real-time data on it before and watched it jump up and down depending on engine load and RPM so there's no clear indication of a change in timing advance. While driving, I've seen the SPARKADV go from 11 deg to 35 deg. At idle, my SPARKADV shows 18 degrees but I don't think idle really matters since the Predator's timing advance affects the 2k-4k RPM band and the 4k-7k RPM band. We have no control of the timing below 2k RPM.hotrodnut said:I haven't messed with the timing yet but couldn't you see the effects of the changes you make by doing a before and after reading using the real time data that the Predator is capable of?
propellerhead said:I asked Tech Support about that. They pointed out that there's a data log parameter called SPARKADV. I've collected real-time data on it before and watched it jump up and down depending on engine load and RPM so there's no clear indication of a change in timing advance. While driving, I've seen the SPARKADV go from 11 deg to 35 deg. At idle, my SPARKADV shows 18 degrees but I don't think idle really matters since the Predator's timing advance affects the 2k-4k RPM band and the 4k-7k RPM band. We have no control of the timing below 2k RPM.
I think I'll just abandon the old school method of looking at timing advance. Back in the days of timing lights and twisting the distributor, we could easily speak of setting the timing in whole degree measurements. Remember the term "vacuum advance"? But with today's computer controlled ignition timing, there is a much finer resolution and it is constantly changing to meet the demands. In the end, it's all about advancing it the most without pinging, whether the advance is measured in degrees, feet, tons, miles, decibels or whatever.
EDIT: The Predator gives you limited control over WOT timing in the 2k-4k and 4k-7k bands. Anything below 2k and all part-throttle timing is still controlled by the EEC.
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