Quote:
Originally Posted by fastsupra
Ok thanks! I'm gonna run 20lbs on the stock twins for now until I can get the meth kit installed, how much race fuel should I add into the tank to run that much? I have 118 torco race fuel
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GREAT QUESTION! I absolutely LOVE help doing this kind of thing to keep my brothers' Supra engines safe.
I'll assume you're running Torco Orange, per this chart:
http://torcoracefuel.net/2-docs/torco-specs.jpg
Let's figure it out this way, just for fun:
- 93 Octane pump gas is about 88 MON*, per the link below.
- Your 118 Torco is a true 118 MON (assuming the fuel is fresh).
- You can run 15psi of boost safely on the stock twins with 93 octane (88 MON) fuel.
- With pure 118 Torco, you'd be able to run at least 32psi, assuming you could get the oem twins to push that much boost. (You could run even more boost at that MON level, with a bigger turbo that's more efficient at high boost levels).
With those
four data points, here's your scale:
Boost Octane
15..........88.0
16..........89.8
17..........91.5
18..........93.3
19..........95.1
20.........96.8
21..........98.6
22..........100.4
23..........102.1
24..........103.9
25..........105.6
26..........107.4
27..........109.2
28..........110.9
29..........112.7
30..........114.5
31..........116.2
32..........118.0
Now, assuming you fill the *entire* 17 gallon fuel tank up, and you want a
96.8 target octane, I calculate 12 gallons of "93" and 5 gallons of 118. I'll leave it up to anyone in the forum to double-check my math.
So pull up to the pump with the needle below "E", and put exactly 12 gallons in. Then dump in a 5-gallon gas can of fresh Torco 118, and run 20lbs of boost all day long, with every confidence that youre engine will be perfectly safe. Maybe take a few fairly hard corners before boosting, just to slosh the fuels around in the fuel tank to get them mixed really well. Note that the longer you run your car with that tank of fuel (even at idle), the more it will get mixed by the fuel system's recirculation.
* Search for: "Premium" or "Super unleaded" gasoline in US (10% ethanol blend)"