Fuel

[96z28SideSwype]

Can the stock system take some race fuel like 5 gallons of 110? Or if you have to change some stuff what is it? My dad wants to run some race gas he's already replacing the fuel pump his was dying at the track Friday and I need to change my fuel filters because I think that's my issue if not injectors.


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[Vicious95Z28]

I run it in mine all the time. Cats don't like leaded fuel though.

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[Injuneer]

Lead is also bad for the O2 sensors. Takes a while, but eventually they die.

[96z28SideSwype]

No cats on any of our cars and o2s aren't too bad so race gas is ok to run cool thanks guys


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[96z28SideSwype]

Vicious95Z28 did you see any improvement in times or anything? I just told my dad what y'all said he was wondering if he will gain anything from just adding 5 gallons, the motor is a 383 LE2 heads compression is about 10.5:1 T56 Trans and I think it has 32lb injectors or ford green tops and a mail tune not sure on injectors can't remember


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[Vicious95Z28]

Doubt honestly that he'll gain much just by adding a lil fuel to it. I honestly can't give you a scientific improvement in my car.

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[Vicious95Z28]

Injuneer, are there any O2's that are lead resistant?

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[96z28SideSwype]

Ok cool thanks I'll tell him and see if he still wants to try it


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[joelster]

He won't gain any power running race gas provided that his car was running fine on pump.

[96z28SideSwype]

Well he found out the pump is going out so he's doing the trap door fix on it this weekend he already has it cut out


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[Injuneer]

@Injuneer (http://ltxtech.com/forums/member.php?u=6025), are there any O2's that are lead resistant?

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A few years back NGK came out with lead resistant narrow band O2 sensors. A magazine tested them on leaded fuel, and the first one failed almost immediately. The replacement seemed to tolerate the lead. I run open loop, but still have the stock Delco O2's installed to plug the bungs. Although I run the engine with a MoTeC ECU, I still have the stock PCM for IAC and the speedo. So I can still read the O2 sensors with my Scanmaster. The engine is tuned w/ C16 for the 300-shot. With that heavily leaded fuel (6 grams/gallon) one of the O2 sensors still appears to read correctly, the other is way off.

A buddy of mine with an 1,125HP S/C 383 LT1 ran dual wide bands, and with the same fuel, he got about 40 - 50 hours of run time out of the sensors. I don't think running diluted 5 gal of leaded fuel through it will hurt them, but the risk is there.

There also isn't anything to be gained by adding the 110 octane fuel, unless he has some detonation with pump gas. When Second Street was setting up my initial tune, they got 490 HP at the flywheel with Sunoco 94. Static CR is about 10.9:1. Tried running 100 octane VP and could not gain any HP. Then, to baseline for the nitrous tune, they took the tune for pump gas, ran it on the 116 (motor) octane VP and picked up 6 HP from the fuel with no changes. The reason for the small gain was higher specific energy content. The C16 has a higher density (pounds/gallon) and the same BTU/pound, which yields more BTU/gallon of fuel.

Now they are cramming in even more energy by oxygenating the race fuel, and picking up significant HP.

[MoeHorsePower]

As said, you wont gain anything unless it is having some retard due to detonation, also when you run race gas, you can have gains by tuning for it, i.e. adding more timing..

[96z28SideSwype]

This is true I'm not sure on the tune what was done and all that


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