So, you want to know how bad SoCal 91 Oct gas is?

[EdyJun]

Well, after studding logs for many months now I have tired to get better timing. It seems that this is the best I can do on my car.

-1.5 deg tming ---GIAC X MBC stand alone - NO TDC -- 62 deg - 95 oct - other ECU -FATS = 4.65:


This is what PSmallsSmells gets:
Weather=62F, Gas=3/8ths tank of 93 octane Mobil, Boost=~23 PSI tapering to ~21 PSI:



So, I decided to do some testing on 95 oct gas using Trick 101 oct and SoCal 91 oct to get a blend that is comparable to 93-94 oct gas for the east coast people, keep in mind that we have 91 oct w/ 10% ethanol. My 95 oct blend has some ethanol in it from the 91 SoCal gas.

I decided to go with 95 oct to better match the 93-94 oct of other states (other states do not have ethanol in their gas).

Here are my results: (The Lem settings were the same for all runs, except for less than 1% change in primary, I used 2 different GIAC X ECUs as well as reset the ECU via Vag (soft reset) and pulled the ECU.) I finished 3/4 th of the 95 oct gas by the end of my testing. So about 200 miles total.

page 1 Red - 62 deg - 95 oct - other ECU -FATS = 4.65 - reset ECU
page 2 Pink - 62 deg - 95 oct - other ECU -FATS = 4.59 - reset ECU
page 3 Dark Blue- 66 deg - 95 oct - Edy's ECU -FATS = 4.67 - soft reset (Vag Clear)
page 4 Light Blue - 60 deg - 91 oct - Edy's ECU -FATS = 4.84 - My BEST time on 91 oct

Intake Air Temp:



Timing: (You can see that the 95 oct gas has about 5 deg more timing ACROSS THE RPM range than the 91 oct gas)



CF:


FATS:


O2:


Injectors Duty Cycle: (91 oct needs about 15% more fuel to sustain about the same power)



You can find my complete detail logs here.

My conclusion:
My brew 95 Oct gas has about 5 deg better timing than 91 SoCal gas, and you need ~15% less fuel to sustain the same amount of power.

I think my blend of 95 oct gas is still not as good as other state's 93-94 oct gas since it still has ethanol, but it is the closest I can match to the 93-94 oct gas.

For those that are doing competitive FATS compared to the people that are running these 93-94 oct gas, kudos to you.

Edy

Discussions ON!

[EdyJun]

• I think i am going to ship to you (PSmallsSmells) 5Gal of OUR 91 OCT SoCal gas to see how it will work in your car. - EdyJun

[jprice@CPS]

I'd say that's the primary reason that psmalls gets more timing up top than you.

[jprice@CPS]

[EdyJun]

I am pulling 1.5 deg of timing right now, do you think i should pull more and why?

Edy

[jprice@CPS]

[EdyJun]

BTW, I am on Stock fueling w/ a crushed 4bar. That maybe why.

Look at my log and his log @ 6500 RPM. We almost have the same timing.

Also, look at this log on 91 I am running more fuel so my setup can run more fuel if need to be.

Finally, his timing is just to show how well his car is doing. I can't compare to his since I don't have his setup. However on my setup I get more timing when I run 95 vs 91. Look at 6500RPM on my log and you will see the difference on timing for 91 vs 95.



We need to compare the same setup.

Edy

[EdyJun]

I would not race or go past 5.5 RPM in 100 Deg, so it would not be important to me.

Edy

[EdyJun]

[jprice@CPS]