[93lx306dev]

i have a 93 lx 5.0 built to the max with out power adders. will i gain any thing from 110 octane race gas? cause i put 2.5 gallons in with 93 octane. it makes my car run so much better. i can feel a little difference in my pedal.
thanks for your time
devin

[Avaric3]

youll only gain from a higher octane if youre tuned for it, if not, its worse for your engine

[93hatch]

Originally Posted by Avaric3 youll only gain from a higher octane if youre tuned for it, if not, its worse for your engine

+654

[Iownastang]

Originally Posted by 93lx306dev i have a 93 lx 5.0 built to the max with out power adders. will i gain any thing from 110 octane race gas? cause i put 2.5 gallons in with 93 octane. it makes my car run so much better. i can feel a little difference in my pedal. thanks for your time devin

built to the max? And runnin a 13.2?

[Grabber523]

1 degree of timing advance per point and a half of octane over what you're tuned for...

so let's say you're tuned for 16* at WOT on 91 octane...

110-91=19 points

19/3=~6x2=12

so 12+16=28 degrees of total timing advance

HOWEVER...if it anything like the 4.6 engines, anything over 25* BTDC doesn't really do much for you.

And if you figure about 4 whp per degree of advance: 4x12=48 h.p. over what you've got now.

Does that help? Unless you advance your timing, running 110 isn't doing much for you.

[93lx306dev]

Originally Posted by Iownastang built to the max? And runnin a 13.2?

that was before i got it tuned.. i have not ran it yet since i got it tuned.. my car is built.. block bored .30 over, heads cam intake.. every thing that can be done to a motor with out power adders..

[haywood11]

Originally Posted by Grabber523 1 degree of timing advance per point and a half of octane over what you're tuned for... so let's say you're tuned for 16* at WOT on 91 octane... 110-91=19 points 19/3=~6x2=12 so 12+16=28 degrees of total timing advance HOWEVER...if it anything like the 4.6 engines, anything over 25* BTDC doesn't really do much for you. And if you figure about 4 whp per degree of advance: 4x12=48 h.p. over what you've got now. Does that help? Unless you advance your timing, running 110 isn't doing much for you.

thats good info thanks alot

[342pony]

what compression are you running

[superbean]

.. it helps if your working out the bugs on the car such as playing with timing... higher octane is less sensative to detonation..

i like to run race gas if i'm going to be running nitrous passes just for the extra insurance. In most street cars with 10.5:1> compression, 93 pump gas should do the trick.

[vfast]

dude I run a very stout 306 with 15 psi and my car runs best on a 50/50 mix on 93 and 110

[stangfreak]

if you are injected the lead in the race fuel is hard on your 02 sensors

[Notcho]

Originally Posted by stangfreak if you are injected the lead in the race fuel is hard on your 02 sensors

Yes, leaded fuel WILL foul O2 sensors as well as catalytic converters, if you have them.

Race fuel like VP C12 IS leaded, so watch out. VP's website even lists their different fuels and tells a little about them, octane rating, if they're leaded, etc.

http://www.vpracingfuels.com

[e3sean]

there is a gas station near me that has 5 gallon drums of 110-114 i am not sure if its leaded or not though its from shell. but they want an extra 5.00 non refundable charge for the can.

[Notcho]

Originally Posted by e3sean there is a gas station near me that has 5 gallon drums of 110-114 i am not sure if its leaded or not though its from shell. but they want an extra 5.00 non refundable charge for the can.

If they say its legal for street use then it has to be unleaded.. among other things.

We sell 5 gallon pails of leaded VP C12 at our shop. The price fluctuates, depending on how much we paid for it. Of course the price of the pail is included. We used to buy it bulk by the 55 gallon drum and sell it by the gallon, but apparently people were stealing fuel out of the drums, so we started selling the 5 gallon pails instead.

The greatest thing about VP C12 is that it doesn't go bad. I parked my truck, a 76 model Chevy for 2 years. Before I parked it, I drove it until it ran it out of gas, then I put 5 gallons of C12 in it, drove it home and parked it in the garage. It sat for 2 years with C12 in the tank and it didn't go bad like regular gas.

[Sleeper_Stang_89]

Originally Posted by 93lx306dev i have a 93 lx 5.0 built to the max with out power adders. will i gain any thing from 110 octane race gas? cause i put 2.5 gallons in with 93 octane. it makes my car run so much better. i can feel a little difference in my pedal. thanks for your time devin

if you tuned for 93 octane then run 93 octane...

[1slo5.0]

Originally Posted by 93lx306dev i have a 93 lx 5.0 built to the max with out power adders. will i gain any thing from 110 octane race gas? cause i put 2.5 gallons in with 93 octane. it makes my car run so much better. i can feel a little difference in my pedal. thanks for your time devin

Define "built to the max". Race gas did not make your car run better nor did it make a difference in your pedal. Its all in your head, seriously. Back when I was in high school I thought I could feel a difference every time I put Cam 2 in my car until I learned in depth about internal combustion engines and how they operate. I'll bet a dyno session that going from 93 octane to 110 will create a small loss in power rather than a gain in power in your car. Internal combustion engines make the most power when they are on the verge of detonation. Too much octane hurts more than it helps. Higher octane burns slower.

High octane fuel will not help at all unless the engine requires it. Three things require octane. Compression, boost or nitrous or any combination of the above. Timing will not require race fuel unless you are running a power adder or high compression.