olddragger

iTrader: (3)

Just a shout out---octane itself has been talked and talked about.

With our high compression rotors + boost naturally calling for increased octane requirments, I was wondering how others are dealing with it?
Are most people just tuning for lower octane pump gas of 91? 93? (which includes the ethanol of course) and can tuning be enough to cover the poor state of modern pump gas?
Or are some FI crazy folks using additives such as toluene.xylene or Torco (MMT)?
Are people that track their FI car adding race fuel/additives just for tracking or are you doing it for DD also?
How has been your experience in this matter, no problems?

wcs

iTrader: (2)

2005 MT
Turbo - T04e
8 psi and 11psi
Tuned on Sunoco 94 (Canada) I believe this is the same stuff that the U.S. gets. I've read that the fuel quality in the UK is considerably better along with a different Octane rating.

Premix 200-1 Amsoil only
I'm aiming for 14.7 Stoic at idle and cruise not 14.1

I've not tracked the car in its current configuration.
The car is not a daily driver.

(Knock on wood) Car seems to be running fine so far, no problems.

Brettus

iTrader: (2)

BP ultimate 98octane (equivalent to US 93)
Couple of guys here can only get 95 (90- 91 US) and was interesting at a recent dyno that the car on 95 was getting some fairly consistent detonation on less timing and 4 psi less boost .

olddragger

iTrader: (3)

understand. Now a days you dont know what you are putting in your tank. And since the rotary really cant depend on a knock sensor......i would like to make sure I have ..at least enough octane available before i put a heavy load on the engine?

Turblown

Just pump gas + correct tuning...

At the track I always recommend blending several gallons of 100octane, just to be on the safe side

Having a turbine housing/wheel that actually allows the engine to breath helps a lot too....

olddragger

iTrader: (3)

agreed--track is a different animal. 100 octane unleaded/non oxygenated gas gets expensive, but it is cheaper than an engine.
Tuning this engine is an on going mystery to me. It doesnt respond to ignition timing changes like a recip does. That makes me wonder about using a/f's/timing changes in order to use a lower octane gas. I wonder if it is safe to do that?
Load really affects things in the rotary and in the higher gears ( 4th/5th) things get different? I dont know how to explain it.
So I have been over octaning ( is that a word) by a little on the days I know boost is going to be used.