It uses an analog output from the potentiometer and the car reads the 1-5 volt or 4-20 mililiamp signal and translates that from empty to full.

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Seth

Bonita 78,000 miles traded on a CTS4

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2000 SSEi "The Rubber Chicken" (L32 long block, S1x, Comp Cams 105# springs, OR rods, 3.4 Smoothflow MPS, Pacesetters 1-5/8 primaries, Zillamotorsports P&P SC, JP single roller timing set, FWI, Magnaflow cat, Interceptor scangauge, AEM wideband, Powerslot rotors, Hawk ceramic pads, solid transmission mount, HPT)

if I get the ECU tuned for E85, can I still run regular gas without an issue?

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Seth

Bonita 78,000 miles traded on a CTS4

Whats an E85 cam?

And you have 4 cams.....

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Can not cam sorry auto correct issues

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Seth

Bonita 78,000 miles traded on a CTS4

an 85 gas can?

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Is that better?

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Seth

Bonita 78,000 miles traded on a CTS4

You would run pig rich and probably have a bit too much timing.

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02 SSEi-Bright, loud, shiny, and stuck on jackstands in the garage...Forged 9.5:1 Shortblock, S1x, ported heads and LIM, 1.8:1 Rockers, 2.5" intercooler, Gen V, N*, Wrapped Speed Daddy's... Shoulda gone turbo...

In regards to the fuel level sender, buoyancy dictates that it (the float) will rest at different levels based on the specific gravity of the fuel. The Dead Sea has a 16% higher specific gravity (than water) so anyone can float on top of it

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How do flex fuel cars do it? They somehow sense the type of fuel they are running?

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Seth

Bonita 78,000 miles traded on a CTS4

Seth, don't. It's not worth it, and once we get rid of the Ethanol subsidies, it's going to be supar frigging expensive.

It may affect where the gauge floats, Myche, but it will be accurate from there, and I'd assume the factory gauge isn't that precise anyways, to matter.

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2003 SSEi

They see x amount of knock and drop from thier e85 tune to the regular fuel tune.

Same as the tuning in your GXP , its designed to run premium , however if it sees x amount of knock it drops down to 87 oct tuning.

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06 Grand Prix GXP Diablosport Trinity , No DOD , Transgo SK , MSD 8.5MM Wires , NGK TR6IX plugs , LED's , Optima RedTop , Projector Retro , 3K Fogs , 20" Led Driving light , K&N CAI w/ Volant oversize air filter , Raybestos Brakes
94 SSEi NGK Plugs , Blue Streak Wires , Pulled Maf screen , Custom Exhaust , Raybestos Brakes , 12" MTX Audio sub and amp , Piaa Plasma Ion Foglight Housings , HIR His' and Lows' , Tinted Tails

I'd assume it's knock as well as the O2's and demanded fueling rate.

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2003 SSEi

I think I am going to actually have to agree with you. It is not worth it for a na car.

Thanks for everyone's opinions.

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Seth

Bonita 78,000 miles traded on a CTS4

Actually, yes, now I can understand what you mean. No hard feelings, was trying to help and honestly didnt get what you were trying to get at.

But do not get a tune or anything for 85 unless you are boosted to the hilt or running insane compression. Cost versus usage just does not calculate in your favor.

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00Beast-- I understand that, it was just something that popped into my head as I was going to get lunch.

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It doesn't matter if you have fuel, water or Dead Sea salt water in your tank, a float is a still a float. It FLOATS on top of the surface, it has nothing to do with the composition of what its floating on. It has nothing to do with specific gravity. The float rides the surface of the liquid.

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-Andrew-

2004 Bonneville GXP | White Gold Tricoat | 144k | His
2000 Bonneville SSEi | Light Bronzemist Metallic | 152k | Hers
2005 Town & Country Limited | Butane Blue Metallic | 191k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 144k | Official Bonneville Hauler

It does not float on top of the surface; it will displace a portion of the fluid of equal weight. Just hit the tackle box and throw a bobber in a glass of water. Then repeat with very salty water. There will be a difference

Wikipedia: Buoyancy

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While techincally correct, the very slight differnces in specific gravity between fuels will not have any meaningful effect on the depth at which the float floats. let alone any difference in how the guage reads.

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02 SSEi-Bright, loud, shiny, and stuck on jackstands in the garage...Forged 9.5:1 Shortblock, S1x, ported heads and LIM, 1.8:1 Rockers, 2.5" intercooler, Gen V, N*, Wrapped Speed Daddy's... Shoulda gone turbo...

On a perfectly accurate float of known displacement using precise measuring equipment, you might see a difference, but there's way too much fudge in the factory system to make any kind of difference that you will notice.

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2003 SSEi