View Full Version : Found a nearby Race gas pump, 110 Octane...ok to use?

05-04-2010, 02:33 AM
I found a place locally that has 110 Octane leaded race gas at the pump

Is this ok to use occasionally? or to mix with standard fuel for some added power?

I know it is kind of a noob question but I guess I am a noob when it comes to race gas.


05-04-2010, 02:50 AM
wont hurt your car, but wont make it faster either.

05-04-2010, 02:50 AM
Lead is usually detrimental to o2 sensors. And if using an older Tial wastegate, they have separate valve stems for leaded use. If you have a newer one, I think their uprated "racing" valve stems come standard now.

05-04-2010, 03:18 AM
also leaded gas is very bad for catalyic converters.

high octane is just a knock deterrent essentially

05-04-2010, 03:52 AM
e85 is a great knock deterrent

05-04-2010, 04:03 AM
I don't think I would use this as DD fill up. But when I up the boost for some fun I was thinking this would be a great way to go...I was mostly worried about the leaded aspect than the actual Race gas classification.


05-04-2010, 04:12 AM
It will kill your kitty cat and O2 sensor.

Otherwise you could turn up your boost and have fun with it.

Like mentioned, for modern applications, it seems that E85 is the better alternative.

05-04-2010, 04:52 AM
i thought lead was bad for the injectors as well

05-05-2010, 10:26 PM
I wouldn't use it unless you're running a full race setup designed to make use of it.

05-05-2010, 11:11 PM
Or since you are only on mild mods, just use water injection to achieve the same end. :)

05-06-2010, 02:38 AM
Who cares.. use it 1 or 2 times a year, it won't do crap, it will just make your timing really happy, no knock response what so ever.

Biggest issue, does it cost you more than you wanna pay? lol.. love all the opinions.

05-06-2010, 04:13 AM
There was a time when I was an "addict" of leaded gas - I needed it like a junky needs a "fix" - because I had a big V-8 engine car with a 10:1 compression ratio - along with the old type of Detroit heads that depended on the lead in the gas to "lubricate" the valve seats.

I remember very well when the leaded gas "disappeared" - I lived in the Atlanta area and there were only a few stations left that sold it - "Purple Martin" stations in Doraville and Chamblee. I would drain a quarter tank (5 gallons) just to get there and fill up - because "I had a NEED".

Later cars - and even retrofits to older cars - used hardened valve seats in the heads to allow use of unleaded gas - and also improvements in power generating technique - such as multiple valves per cylinder and turbo-charging - rendered the need for high compression ratios and leaded gas mute.

Why would anyone want leaded gas now? Unless you run some very high compression in an NA car (like NASCAR with OLD Detroit wedge engines) it is totally unnecessary.

I cannot imagine that you have 110 Octane gas without lead.

05-07-2010, 08:27 PM
Engine timing is designed for the lowest octane your engine would take. A boost in octane won't mean a boost in power, unless you're gonna change your timing. The JDM 3SGTE has more power due to timing advances, but one time I tried putting 93 octane in mine and you could hear the engine complaining (standard Malaysian gas is 95).

And yes, leaded definitely ruins cat-convertors. Whatever else it ruins would be engine specific. All I can say is, don't put jet fuel in an RX7.

05-07-2010, 11:00 PM
All I can say is, don't put jet fuel in an RX7.

I did in my Rx-7 plenty of times at track days. :D
Then again, I pre-mixed also.

05-08-2010, 03:15 AM
I did in my Rx-7 plenty of times at track days. :D
Then again, I pre-mixed also.

I don't know if we're talking the same jet fuel. My genius buddy works for an airline and one day he stole some jet fuel to see if it would work. He didn't mix it either. Waste of good RX7

05-08-2010, 04:25 AM
Um... I didn't think it was legal for leaded to be sold from a pump anymore. We can get 101 from a pump nearby but never have seen leaded.

05-08-2010, 04:54 AM
There's like 5 or 6 places around me that sell leaded from a pump. Dunno.

05-12-2010, 12:45 AM
I did in my Rx-7 plenty of times at track days. :D
Then again, I pre-mixed also.

Note that jet fuel is essentially kerosene (diesel) and very low octane.

Reciprocating engine aircraft fuel is ~145 octane and of course still generally available at airports for aircraft.

05-12-2010, 05:06 AM
The Sunoco up the street from my work sells 110 leaded from the pump...it's awesome.