compression ratio - fuel calculation with Fizzle Z142 Supercharger

[Sneed]

Hello there!

I am not sure if I miss something or if I got something wrong with my fuel calculation.
When I take a Seadoo RXP 300 with a compression ratio of 8.4:1 with the Fizzle Z142 Supercharger wheel which says it has 24 PSI max, I get 13.71 combined compression ratio.
Is this correct?

The list I got is the following:
12:1 93 Pump
14:1 110 oct.
15:1 C116 oct.

So I would not be able to run standard pump on this setup if I am right?

thank you
Sneed

[JCIBELLA]

Hello there!

I am not sure if I miss something or if I got something wrong with my fuel calculation.
When I take a Seadoo RXP 300 with a compression ratio of 8.4:1 with the Fizzle Z142 Supercharger wheel which says it has 24 PSI max, I get 13.71 combined compression ratio.
Is this correct?

The list I got is the following:
12:1 93 Pump
14:1 110 oct.
15:1 C116 oct.

So I would not be able to run standard pump on this setup if I am right?

thank you
Sneed

I ran a ET 142 wheel on Shell 93. I turned 9200 RPM 23lbs of boost. I used Map Tuner. I did logs sent them to Riva to get the AFR correct. I don't know how many RPM you need to get Fizzles 142 to provide 24LBS of boost. I bet close to 9500 RPM.

[tiderider]

Hello there!

I am not sure if I miss something or if I got something wrong with my fuel calculation.
When I take a Seadoo RXP 300 with a compression ratio of 8.4:1 with the Fizzle Z142 Supercharger wheel which says it has 24 PSI max, I get 13.71 combined compression ratio.
Is this correct?

The list I got is the following:
12:1 93 Pump
14:1 110 oct.
15:1 C116 oct.

So I would not be able to run standard pump on this setup if I am right?

thank you
Sneed

Ignition timing will determine what you can do.

[Sneed]

My concern isn't reaching 24PSI. I'm concerned that the engine will blow up because the fuel has to too low octane and the engine misfires.
My rev limiter is on 9500 rpm.

[K447]

 I'm concerned that the engine won't blow up because the fuel has too too low octane and ...

You would be concerned that the engine will blow up with low octane fuel

[1tommygunner1927]

My concern isn't reaching 24PSI. I'm concerned that the engine won't blow up because the fuel has to too low octane and the engine misfires.
My rev limiter is on 9500 rpm.

Race gas or Octane additives. I prefer octane additives as they are available in quart size cans and easily carried in most glove-boxes or storage bins (when re-fueling at the marina).