.RTErnie

I've had my car boosted for about 4 months now and I havent had an EGT gauge to mess around with timing nor enough time on the dyno to really tinker with timing. What I would like to know is what kind of timing you generally shoot for under full boost, what kind of timng at idle...what kind of timing before you go positive pressure etc. OR!!! if you dont want to tell me because that would be no fun, at least give me the logic or reasoning behind existing theories so that I can fiddle **** with timing.

I figured if I had 20 hours on a dyno I could **** around with timing and watch my knock sensor. Add timing until it stops making power and then back it off 2 degrees or so.

Another thing I notice is people picking up REDICULOUS amounts of power by switching to race gas opposed to pump gas. Is ALL that power created from the timing advance that is allowed with the gas? Im sure the afr's are a bit lower due to the fuel, but again...what am I missing?

dennis

Yes, race gas won't magically give you power, but its inherent resistance to knock will let you run more timing advance.

Based on the EFI class I was in, an ideal situation would be to have your car on a steady state dyno so that you can hold your engine at a particular load and adjust your timing in real time to see the results.

Maybe some of the more advanced tuners will check in to help out.

ITR981002

Mine is 16.5* at idle. As much as 43* in vac at higher RPM, around 27* as it enters boost. Boost table is 25.5* till 5psi or so, then dropping smoothly to 22* at 11psi.

That's my settings for 94 octane. I'm probably going to go as much as 27-28* on top on 110 octane, then take a look at the plugs.