Someone shared that gasoline that has been sitting for a while is more explosive = better combustion. If my car has been sitting for 3 weeks...I wonder if that has anything to do with it.

 

Actually, it should be the opposite. Fuel actually loses quality relatively quickly if it's been sitting a while. The volatile chemical elements in fuel break down over time and decrease the efficiency of its combustion. Usually if the fuel is bad enough, the effect is REALLY noticeable.

 

and my BUTT-dyno as well.

 

right...this is why fuel additives such as STABIL prevents gasoline spoilage considerably.

 

boost increases in hot temp weather.
less boost in cold weather.

 

this could very well be it...I am going to do some datalogging later today to see if anything looks weird...temperature is mid 80s right now and the car is back to where it normally is...I mean, she is no slouch, but the way she was running a couple of days ago...sweet mother of baby jesus..!

 

Tom the air may be more dense, but I can assure you it does not contain more O2. The FIO2 of air is 21%

 

The FiO2 may not change but there is more "air" per unit volume when it's cold and hence more O2 per unit volume also.

 

Datalogging confirmed the car is pulling timing...at initial load it is ranging from 5-6 on timing, then it climbs up progressively to 15...with octane booster under initial load it goes up to 10 and then climbs up to 15 again. Temps were about 90 degrees. I think the tuning may be off. I will try to call EVO tomorrow but I haven't had much luck on the past. Does anyone know or talk to anyone specifically at EVOMS? If so, who do you normally deal with there? Thanks.

 

got it...so octane count would in theory, decrease. Thanks for the clarification.

 

UPDATE: check your lines going to your fuel pressure regulator. Mine was completely off...it is A COMPLETELY different car now...pulls like a mo'fo on 100 degree weather...I can only imagine what it is going to do when it begins to cool off. I am super happy...

Huge thanks to Karl Wilen (Porschedoc) and Stephen (both local guys) - in combination with Todd at EVOMS got it figured out...

YES!

 

Glad you got it figured out. But still doesn't explain your original butt-dyno readings.

 

The car was going lean, pulling timing and the intake temps were skyrocketing. Sent the datalog to Todd and he pinpointed the issue right away. Appears to be an issue with both the stock and modified twins.

 

Understood. But he said the car was performing better, i.e. not consistent with pulling timing and increased IAT's.

 

Yeah, descriptions can be misleading, always best to datalog and see the whole picture. FPR line is an issue on our cars.
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