ViciousV6 The 100 octane rating is what I tell people because it had been the consensus in the past. That may be a conservative number, but I'm not going to state higher, then have somebody E-Mail me that they blew their engine on a 110 chip!..
I've run 26 lbs through stock heads, and no knock with alchy at 20* timing. That doesn't mean everybody can do that. There are many reasons.
Psi is just a reference number. With cam, good flowing heads, etc, you can put a 25 percent more powerfull charge in there, at the same boost level. For instance I am putting 320 gps in my enging (air flow in grams per second) at 15 psi, since I went to the GN-1 alum heads, and roller rockers. Before (with the stock heads) I was putting 250 gps in at 15 psi. That much more power can easily pop a HG, if you detonate..
Your 26 PSI may not be an indication of how much air and fuel you are putting in. Maybe your heads are mismatched, cam is worn, or the cat. is partially pluged. Any one of these factors could restrict the intake. You may be putting as much air in as somebody else (using stock heads) is putting in at 20 psi.
So somebody running a different combination would say "Hey I'm only to run 20 psi, with alchy" and be making the same power as you. He could even be making more power than you. It would come down to quarter mile times, to see who was making the most power. Dennis Hogan ran 10.97 with alchy injection, at 18 psi. He uses alum heads however.
Your high timing may mean you are running rich, and flooding the chambers with lots of alchy, and water. In that case the car wouldn't run right with the timing turned down. I have actually lost power this way, though the boost gage is really up there, the combustion isn't as good...Timing isn't everything either. Just part of the combination..
I have blown 2 headgaskets making the error of comparing alpples to oranges. Psi numbers are fine, but aif flow is a better number. A scan tool is a must. I don't want anyone else to make the same mistake, so this is why I tend to be conservative. It's all in the combination, since everyones is different, I would never tell someone to throw a 110 chip in and feel like they are safe. Even with alchy.
Tip: I load my gas with toulene, then tune to a safe level. Then through adding a few gallons at a time, (every few days during the normal course of driving) I slowly dilute the mixture until I am running on pure pump gas. If knock appears, it is a little bit at a time. After a week or two, I know it is safe..
Donnie Are you dropping out any fuel at wot running the de-natured? I am running the Translator+ and I know there is a way to have it programmed for that, for people running a lot of de-natured at WOT. I like the De-natured, and will be tunning my new combination for it. When I used it before, I was getting no 'transitional knock. How about you?
BTW the cold air intake works great!
