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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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Old 03-23-2009, 11:33 AM   #1
dfoster154
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Leaded Race gas - good/bad?

So there is a Citgo near my parents house that sells 110 Octane leaded race gas($5.80 a gallon). I have a Mobile near me that sells unleaded 100 racing fuel (i think it is 100).

I know the octane is better, but I have heard the leaded fuel in our engines can cause problems over time. Any expiriences out there?
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Old 03-23-2009, 12:05 PM   #2
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It will only cause a problem if you are running a cat or using the o2 sensor. It will tend to clog up both and shorten their life.

Dan
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Old 03-23-2009, 12:38 PM   #3
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The leaded fuel can destroy the O2 sensor in a matter of miles, compared to unleaded which can last thousands on top of thousands.
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Old 03-23-2009, 01:17 PM   #4
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Thanks guys!
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Old 03-23-2009, 02:32 PM   #5
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Does that include wideband o2 sensors?
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Old 03-23-2009, 03:02 PM   #6
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Quote:
Originally Posted by need RX7 View Post
Does that include wideband o2 sensors?
Yes, any o2
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At the local AutoX:
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Speed for Sale shootout 2007:
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A few laps at Barbers:
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Old 03-23-2009, 03:12 PM   #7
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Why do you want 110 octane? It is my understanding that the factory teams of the '80's actually brought their own fuel to the track, 78 octane.
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Old 03-23-2009, 05:34 PM   #8
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With forced induction higher octane will help you push your limits further for power etc. I simply saw Racing Gas at this Citgo station that stated it was Leaded 110, and i figured I would do my research to see if would even be worth putting into my car for a strip day.

As I figured the o2 and widebands will get ruined (and I have read our plugs will foul fast as well) so in all the extra 10 octane just isn't worth it.

BTW, I spoke to some of the high end muscle car guys and they live off that stuff for the strip, but then again their engines were/are made for it.
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Old 03-24-2009, 07:59 AM   #9
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If your a big hp guy your pretty much going to have to have it unless you have AI.
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1993 Rx-7 SM2 #11
At the local AutoX:
http://www.youtube.com/watch?v=9VOSQkkSLQs
Speed for Sale shootout 2007:
http://www.youtube.com/watch?v=JiqlyAkGmpg
A few laps at Barbers:
http://www.youtube.com/watch?v=6_h5q...x=0&playnext=1
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Old 03-24-2009, 08:25 AM   #10
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Quote:
Originally Posted by csprx7 View Post
Why do you want 110 octane? It is my understanding that the factory teams of the '80's actually brought their own fuel to the track, 78 octane.
Thats only for N/A rotaries. And it wasn't 78, it was more like 85-86.
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Old 03-26-2009, 02:47 PM   #11
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Bad for o2 sensors, good for performance...plus you get the "white tip mod" and your exhaust smells like roses.
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Old 04-02-2009, 08:46 PM   #12
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it does smell nice and sweet!!
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Old 04-05-2009, 08:43 PM   #13
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If you are cranking the boost up then its good insurance. However just by adding "race gas" does not add power, infact it will loose some power unless its q16 or such ($15 per gallon). I used to add 5-6 gallons (110 leaded) when at the drag track back in the day just to add some safety.
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Old 04-06-2009, 10:45 AM   #14
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Lead works great (to a point, it plateaus) to increase the octane rating.
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Old 04-06-2009, 02:52 PM   #15
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Quote:
Originally Posted by RIZZXX7 View Post
it does smell nice and sweet!!
That answers so many questions...
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