Not to hijack the thread, but Cliff, i have a diablosport. I loaded up the canned tune on my car and didnt mess with it.

You are saying that it automatically advances the timing by 2º by loading up the canned tune correct?? So if you have a 93 in your area, is it safe to run 6º of advanced timing? Will this even make a difference in the way that the car drives?

i forget if diablosport even allows for 87/89/93 tunes...im pretty sure i just uploaded the canned tune

 

I don't know what "sense the predator puts the ecu on open loop taking the ecus self adjustability away anyway?" means. The Predator tune does not in any way affect the PCM's (Powertrain Control Module, Ford's name for ECU) decision making ability as to when closed loop and open loop operation is called for.

The PCM, via the MAF (Mass Air Flow sensor) handles air of differing densities quite nicely as it measures the mass (density) of the incomming air.

You seem to have a very confused understanding of how this all works, buy Greg Banish's book...

 

1. To be blunt, if you do not know the difference between closed and open loop operation you should not be mucking about with your engine's tune--buy Greg's book and read...

2. WOT is Wide Open Throttle;

3. The adaptive long term fuel trims, might let the PCM correct for the commanded over rich mix--you need to log short and long term trims to see what's really going on--I don't know for sure what +40% means to the Predator. but I'd bet the fuel trims are maxed out. There may also be other issues that make your engine's setup like a rich mix;

4. That's OK if you live somewhere that the normal ambient temps are under 95°;

5. I would recommend Innovate's LC-1, except that Innovate's support over the last 2 years has deteriorated to the point that it sucks. There are a number of other systems out there, Google "wideband O2" and pick one;

 

I have no intimate experience with the Predator, however based on what I know of industry practice, and what the Predator user's manual says, I suspect it's base 87 octane tune makes changes to the OEM tune as I highlighted above (+2° global, and +1.0° or so to the borderline table). These are dead safe increases to the stock tune's settings.

Beyond that, and due to the fact the the Predator apparently chooses to use percent based changes (as opposed to actual number of degrees), I would not venture to make any specific suggestions.

I use Delta Forces Commando system, and in what passes here for winter and 93 octane fuel, I run +4.5° total increase to the Global Spark Adder, and +1.5°, +2.0°, and +2.0° to the Spark Borderline Table in the higher load/rpm ranges. This means +6.5° total added advance at most loads/higher rpms.

As to whether it makes a difference--of course it does. By lighting the fire sooner, with slower burning fuel (I.e higher octane), higher peak combustion pressures are reached when the piston is traveling downward. This equals more power...

I don't wish to sound like a broken record here, however I STRONGLY recommend that those of you interested in tuning buy Greg's book. It is as easy reading as topic this complex can be, and will really give you a great understanding of what going on in there.

Another wonderful book is John Heywood's Internal Combustion Engine Fundamentals. I had the distinct privilege of studying under Dr. Heywood some several years ago. His book is the definitive resource for understanding how these things work.

 

Sounds good Cliff. You the man.

 

so keep the timing up and and put the WOT back to where it was?

 

Yep, that would be your best and safest bet. Just like he said the Predator will not let u do any outrageous advanced timing so just crank it up and use the highest octane gas u can. I have been using premium gas with my advanced timing and everything is fine.

 

soo if his car does cut out and seems to like the fuel 15% more not 40% with intake plenum and exhaust,4.11s wich according to diablo requires a custom tune wich constatutes more fuel ?

 

cliffy im asumeing you are a tech so if you could use your sources to find a safe fuel setting for an 02 with 80k exhaust (catless) bbk intake and plenum, 4.11 gears? and properly gapped iridium plugs and 92 oct, need more fuel with more air? to rich is better then being lean right?