How high an octane rating is enough for stock?
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I use ERC's MUL-A:
http://www.ercracingfuels.com/ercMulA.htm
You might consider it, in some proportion, when we determine the
minimum octane rating for max power for our cars. I suggest this
gas because it's fraction of toluene is 20%, which is essentially
identical to pump super.
Joe
http://www.ercracingfuels.com/ercMulA.htm
You might consider it, in some proportion, when we determine the
minimum octane rating for max power for our cars. I suggest this
gas because it's fraction of toluene is 20%, which is essentially
identical to pump super.
Joe
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your car's timing with different gases, and found that anything
over 93 (R+M/2) made no difference? (and you have a 996tt, right?)
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I do not have a TT, only a 996 (sc'd) and Gt3. We did monitor a stock 03 TT a few years back and found that timing was maxed out running 93 octane with 10% ethenol. However, we deliberately heatsoaked the engine and the timing did pull, but only slightly. Not even enough to notice while driving.
The control was first monitoring the cars with 100 octane and then with the 93. No difference.
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There is no reason you cannot run a higher octane if it gives you a good feeling or it "appears" the car runs better, as it will provide better protection in extreme conditions. I know, as ridiculas and as false it is, my cars always run better after they have been bathed and waxed and the tires are nice and shiny. 
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subscribed....great questions....hoping someone has the answers. I was running strictly VP100 and the car "felt" stronger, but no data. I have since gone to pump gas as I ruptured 2 fuel lines and the hypothesis was the higher octane fuel (actually higher toluene content) was "eating" my hoses (I know this is still debated).
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The race gas guys at ERC say that definitely, toluene will eat plastic and rubber
that is not designed for it.
I am looking for every tenth of a second in performance, but would certainly
run the cheapest gas that delivered it. That's why I started the thread. I don't
have the dyno or instrumentation to do the analysis myself, and there's no way
to easily change fuel or isolate it's changes at the events I compete in....
that is not designed for it.
I am looking for every tenth of a second in performance, but would certainly
run the cheapest gas that delivered it. That's why I started the thread. I don't
have the dyno or instrumentation to do the analysis myself, and there's no way
to easily change fuel or isolate it's changes at the events I compete in....
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Talk to Kevin at UMW.
Registered User
Joined: Jan 2008
Posts: 241
From: Westminster, MD
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subscribed....great questions....hoping someone has the answers. I was running strictly VP100 and the car "felt" stronger, but no data. I have since gone to pump gas as I ruptured 2 fuel lines and the hypothesis was the higher octane fuel (actually higher toluene content) was "eating" my hoses (I know this is still debated).
Toulene (in its raw form) does not play well with natural, butyl, neoprene or nitrile rubbers. Diluted toulene at the correct concentration (as in performance gasolines) will typically not harm late-model automotive plastic fuel lines. Most of the these hard plastic fuel lines are made out of polyamide-12.
The autoparts store 'fuel line' is typically nitrile rubber and is not the best material.
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