Av gas and carb jetting.

[charger greg]

My son is an aviation maintenance tech so I have easy access to 100LL Av gas. This season I started using it in my Charger drag car. A 11.5 to 1 ratio 440. Currently runs mid 10's.
I'm curious, who else is running av gas in their race car and if you had to do any jet changes or noticed any differences / changes in your cars performance when switching to Av gas.
I was running Turbo Blue 110 and when I switched to the Av gas the car did not run any different et / mph wise. Doing some tuning Using my wide band o2 gauge the ratio was 13.2/ 13.5 range with the Av gas. Where with the Turbo blue the ratio was 13.1 to 13.3. I jet up 2 sizes in the primary and secondary's to see what would happen. The car picked up about 3 to 4 hundredths, also something else changed, the car is faster as the engine gets heat in it. When going rounds the car picks up, when in the same scenario with the Turbo Blue fuel the car would slow down. Nothing drastic just a couple hundredths. To be honest I don't know if the fuel is the reason for what is happening with the car but the fuel is the is the only thing that is different / changed. What is your experience when using it?

 

[Don Frelier]

What about ambient temperature and humidity?

 

[charger greg]

What about ambient temperature and humidity?

The results I've described are not from a one time event but over the whole season. The number changes have been consistent over 4 events.
Do you use Av gas?

 

[kiwigtx]

My son is an aviation maintenance tech so I have easy access to 100LL Av gas. This season I started using it in my Charger drag car. A 11.5 to 1 ratio 440. Currently runs mid 10's.
I'm curious, who else is running av gas in their race car and if you had to do any jet changes or noticed any differences / changes in your cars performance when switching to Av gas.
I was running Turbo Blue 110 and when I switched to the Av gas the car did not run any different et / mph wise. Doing some tuning Using my wide band o2 gauge the ratio was 13.2/ 13.5 range with the Av gas. Where with the Turbo blue the ratio was 13.1 to 13.3. I jet up 2 sizes in the primary and secondary's to see what would happen. The car picked up about 3 to 4 hundredths, also something else changed, the car is faster as the engine gets heat in it. When going rounds the car picks up, when in the same scenario with the Turbo Blue fuel the car would slow down. Nothing drastic just a couple hundredths. To be honest I don't know if the fuel is the reason for what is happening with the car but the fuel is the is the only thing that is different / changed. What is your experience when using it?

I used AV gas a long time ago for racing - and I had to go down a couple of sizes in the jets. AV gas is a lot less viscous than regular gasoline, so it flows easier through the jets. Reducing the jet sizes down makes it more controllable when tuning.