View Poll Results: What is your typical fuel octane rating?
87 octane
42
30.88%
89 octane
10
7.35%
91 octane
33
24.26%
93 octane
51
37.50%
Voters: 136. You may not vote on this poll
Octane poll for 16V cars
06-17-2011, 09:43 AM
#92
Rennlist Member
Since I slapped on the EuroS heads onto my 4.5 bottom end, kicking compression ration to about 10.2:1 and with straight CIS, I use 91 or better.
Not a knock heard so far.
Not a knock heard so far.
06-17-2011, 10:00 AM
#93
Racer
Join Date: Jan 2009
Location: Adelaide South Australia'79 5spd twin turbo
Posts: 326
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LPG Liquid Petroleum Gas
Octane rating ?? somewhere between 105 and 130 depending on who you believe.
Price ? usually around half that of petrol.
Cheers Roy
Octane rating ?? somewhere between 105 and 130 depending on who you believe.
Price ? usually around half that of petrol.
Cheers Roy
06-17-2011, 10:36 AM
#94
Nordschleife Master
What's the price per BTU for LPG?
I'm running a slurry of 110 race gas and either 93 octane E10 or 91 octane pure gas to average a 95 or 06 octane. Just don't need more broken rings on my hi-po engine. I figure I'm at 11:1 or 11.5:1 CR so too tall for plain gas with no ECU to monitor things. At least not without worrying.
I'm running a slurry of 110 race gas and either 93 octane E10 or 91 octane pure gas to average a 95 or 06 octane. Just don't need more broken rings on my hi-po engine. I figure I'm at 11:1 or 11.5:1 CR so too tall for plain gas with no ECU to monitor things. At least not without worrying.
06-17-2011, 10:50 AM
#95
Administrator - "Tyson"
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Knock sensors are there to protect the engine from anomalies, not give the leeway to run lower octane gas.
Yes, the computer will detect the knock and retard the ignition until it goes away. Immediately after (or a few revolutions...) the computer will restore the timing bringing the knock back. This cycle goes over and over and over and over.......... which is not good for any motor, except maybe a diesel.
