I am very new to 6Speed so I apologize if this question has already been asked/answered. I have been through 80 pages and haven't found any discussion.

Would it be possible to carry an auxiliary fuel cell in the "trunk" and have it on hand and available at all times when you want to switch to a higher-octane program for those moments when you have the NFS?

There are several sources for 4, 5, 8 gallon fuel cells with various L X W X H dimensions that could accept an internal pump with very little modification. Some are even sumped. Wouldn't it be possible to tie in a solenoid-activated 3-way valve just upstream of the Y split to the 2 fuel rails and another downstream from the rails after the Y back to the return line? This would facilitate the switch over between the two fuel sources. I am speaking of the earlier 996's that have return systems. There should be minimal cross-contamination of each octane with a short travel distance after the cutoff. Of course it would require some AN fittings and braided line, or other conduits of your choice. Would also need some DPDT switches with knowledge of where to route the "juice", but there seem to be an abundance of bright minds on this forum, and I'm sure someone will know how to do all of this.

I'm merely thowing out an idea for some possibility thinking. I can schematically visualize the way the plumbing would be and how the electrical circuitry would be wired, but being very lacking in "Porsche-Know," I wouldn't know how to execute the process. I don't even know if there is enough room to place the valves close to the rails as I have never seen one of these engines apart, except for Sharky's build pics.

Gentlemen/Ladies with brilliant minds, please start your engines.

P.S. I wish someone would tell me how to make the subject title appear in bold script.

 

I've seen it done with pump unleaded and C16 using Kinsler fuel solenoids. The setup was very complex.

Personally I fully flush the fuel system of C16 before using unleaded. Rail, lines, pumps, surge tanks, etc. It takes quite a bit to flush the last bit out. Then I change maps on my ECU.

You'd need to be able to switch tunes inflight to make your idea work.

Further high octane fuels go bad after sitting for a period of time.

 

Thanks MrB.

Know about the light ends evaporating. In the racing days had that problem with the big 55g drums. Drag racers always do with multiple requirements for different engine builds. Never much of a problem with the alchohol though. Just keep the little hydrophile tighty corked. Not near like the 14 and 16.

Was thinking of switching of switching on the ramp, or the taxiway, instead of in-flight.

Being ignorant of Porsche system didn't know about the surge tanks. Assume they are bi-directional?

BTW ran Kinsler's injectors 20 years ago. Great product.

 

my trunk is too small to begin with... too bad my condo wouldn't let me keep a 55gal tank of 100+ in the garage

 

The only way to safely do it "on demand" would be with a secondary injector setup. Any way you cut it, you're looking at a few grand to build a safe system.

That buys a lot of race gas.

 

Look into meth injection

 

If you want to blow your engine into ittybittypieces, I'll do it cheaper than a meth/water injection kit. The photos will be more entertaining, too.

Thus it was written, Thou Shalt Not Half-*** a Fuel System.

 

Simba, I don't know if a secondary injector system would be necessary. I will will get some pictures and diagrams together in the next few days and post them. If I can locate pictures of an engine with enough things stripped away to see the fuel rails with the supply and return lines, I may see that the method I have in mind would not be feasible, either from the standpoint of safety, or available space.

I certainly wouldn't consider riding around in a car with an unsafe fuel system. Would never consider violating the "half-*** Commandment."