Here's a suggestion for an aftermarket product (or mod) that might be worth some discussion:

Those running multiple engine management maps (e.g., Utec) w/ change-on-the-fly capability would be able to instantly add 50+ HP by accessing racing fuel (RF) and switching to the corresponding RF tune. This could be accomplished at any time in much the same way that NOS tanks are activated, if a second RF tank was added with an electric fuel-tank switching valve.

Offroad vehicles commonly have two tanks to increase fuel capacity with separate fuel level sending units and a tank selector switch. An in-car racing fuel cell could be added to a WRX, but I would prefer an undercar aftermarket double tank that had separate filler necks. The RF tank would of course be the smaller of the two.

This seems to me too simple (compared to the risks and complexities of N2O or H2O injection) to be true. Is my thinking flawed?

I'd like to get comments/discussion from some of you PROS that are far more experienced than myself. :)

what exactly have you been doing with nitrogen peroxide :confused:


kidding aside, it doesn't really sound streetable to me. Unless the tank were the size of a regular n2o bottle, and you could mount it in your trunk. But thats also not safe at all. Plus all of the work to be able to run off that one gallon of race gas. Seems like its easier to just fill your main tank with race gas before you hit the track and switch maps with your accesport :)

Several Supra guys are doing this. It is time intensive but in theory seems like it would work. One local guy is doing it and I'm curious how it turns out.

He's actually on this board now. His screen name is Jim Swantko. If you pm him, tell him how much NC State sucks! :)

Originally posted by silverscooby
Several Supra guys are doing this. It is time intensive but in theory seems like it would work. One local guy is doing it and I'm curious how it turns out.

He's actually on this board now. His screen name is Jim Swantko. If you pm him, tell him how much NC State sucks! :)

Jim, everybody knows NCSU is teh greatest... ;)

-Nick "Class of 2001" Luhr

It seems tricky and waste full... I dont realy see the point. If your at a track just fill up on race gas, if your a drag racer then get N2O.

How long would it take to purge the lower octane fuel from the filter/lines?

I guess if you were trying to develop the ultimate sleeper it might be worth the effort.. but a properly tuned nitrous oxide set up is probably as safe as running maximum boost and timing advance on race fuel.

Don't forget you have to switch the send AND return lines, otherwise you will quickly pump your race fuel tank empty...

Doesn't seem worth the hassle to me, but I suppose it could be done.

-Charlie

I guess my proposal was confusing. I'm simply suggesting two gas tanks, like are common in the off roader's aftermarket. A ~5-gal tank would have racing fuel for those occasions where another +50 hp were needed (similar purpose to N2O, but cheaper, stealthier and in larger volume). The sister ~15 gal gas tank would hold daily driving fuel. A labelled toggle switch is used to instantaneously select which tank is in use and sending units in each activate the stock fuel gauge as appropriate. This would enable a race fuel high-hp map to be quickly used whenever desired on strip, track or STREET! All we need is the aftermarket fabricators to come up with a low cost dual tank system--separate lines to just before the filter with separate returns would minimize purge times. :D

Sounds like a cool idea! Now build it...and people will buy it!

Originally posted by nhluhr
Jim, everybody knows NCSU is teh greatest... ;)

-Nick "Class of 2001" Luhr
I really hope you tried to do that....
otherwise, I'm really going to have to laugh my butt off.

There isn't enough room for a two tanks that size.. maybe a ten gallon and a two gallon tank. I was under my car today installing different links in the rear.. there isn't much room under there.

Although a very interesting idea, sounds like too much work for too little gain. Get accessport or UTEC and just fill up with a few gallons of race fuel and switch maps.

If you can get a custom fuel cell in the trunk hidden behind a fake wall (with maybe a fake sub on it for good measure) you can maybe fit a 5-10 gallon tank there. Run the lines and hardware to the engine bay, into a TGV eliminator from APS that comes with the secondary fuel injector bosses and set the pumps up to run off of the ECU...it can be done. I would recommend that setup to be run with a fairly large turbo so when you scramble boost to high, the auxillary fueling starts and you get more boom. By switching to high boost, I mean HIGH boost (25-30psi). This setup would possibly be better suited to larger turbo setups that want to be streetable and have a huge boost in power on the high boost map.

But the downside is ading more parts and weight to you car. The more parts you have, the greater chance of something failing. Most people turn away from this type of setup due to complexity. Most turn to water or alcohol injection due to slightly less parts and it is more wallet friendly.

If I misspoke anywhere, forgive me but I also would like to hear more opinions on this subject.

JAN
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The wages of sin are an expensive infection

WTLcentury :)

Very very old idea. Not saying its a bad idea, but its is a very old idea.

If your thinking low budget, look into ford trucks with dual tanks. you could probably scab some of the stuff and or idea's off of one of them.

~v6

V6TurboTA: Two tanks to increase capacity is an old idea--two tanks to have increased HP on tap at any time or place is a work-in-progress for WRX's.

onefasazn: Thanks for the ideas--much food-for-thought. :)

it seems like a second tank would need some time to purge and get the racing fuel through the lines before it would be available to the engine. similar to the NOS purge kits to remove and air from the lines before entering the engine.