Anyone run race fuel in their NA engines?
Does it gain any more power?
At $7 per gallon, I'm wondering if it will help get that extra umph.
We have Sunoco 100 octane at our local track.
Any danger to the engine?
Any gain?

Word?

 

Without something like an emanage to advance some timing while using the fuel, the stock ECU cannot gain any horsepower above 91 octane so anything above that is just wasting money.

But as long as its unleaded, no there is no harm using it (aside from spitting dollar bills out the tail pipe)

 

I'm not so sure. Since the oem ecu is a learning ecu, it might make some kind of difference, but not much. Even if you have AEM EMS as I do, running a fuel higher in octane than what the car was tuned on is wasteful, as it does not recognize the higher-rated fuel as such.

If a person had two tunes, one for 93(what is available here) and one for 100, then it would be advantageous. Running a higher octane than what the car is tuned for should make the car run richer. This might be good if one were running a 7lbs pulley on a CTSC where stock injectors are most likely maxxed out.

 

Ehh I run 100 race fuel in my stock engine, stock ecu.
I dont really know if it makes more power but the smell is worth the extra million dollars!!

 

I'm not sure if 100 octane is high enough to burn hot enough to cause some problems over a (short)period of time. Don't know if it's a wive's tale, but I was always under the impression that running higher rated fuels led to higher burn temps... which can cause premature damage to catalytic converters and such.

 

good thing I dont have a cat.

 

 

Like perfume for your exhaust.

 

I have often wondered this. So by our ecus being learning does that mean they advance timing until ping and then back off? or is it a different process.

 

When Sideways was NA he filled up with race fuel and would reset the ecu. A dyno showed an immediate ~15 - 20 whp gain. I can't remember the exact numbers but it was a significant gain.