18 Psi On Pump?
Senior Member
Joined: Jan 2002
Posts: 844
From: Birmingham, AL
Originally Posted by TheCamel' date='Apr 1 2004, 03:43 PM
I agree, check out the water injection for the safety margin, although the pump says it is 93 octane, it does not mean you got a quality product. Also gasoline as it sits will drop in octane. My uncle hauled gasoline for years, the Sunoco Ultra 94 comes out of the plant @ 108-111 Octane, but with it being mixed with the gas in the tanks that has been sitting, you are getting an average minimum of 94. If you have a few extra bucks, have a private company check the pumps you frequent, some of you might be surprised how high the acctual rating is on the gasoline you are pumping in your cars, the octane rating on the pump is the minimum the gasoline has to be be to meet state testing. My uncle said he had delivered a few loads to the stations and their high octane tanks were not low enough for the full load, and the managers just had them dump the excess into the lower octane tanks. This is something to think about the next time you go to the pumps...
STEPHEN
Senior Member
Joined: Jun 2002
Posts: 9,725
From: La Plata, Maryland
Originally Posted by TheCamel' date='Apr 1 2004, 07:43 AM
I agree, check out the water injection for the safety margin, although the pump says it is 93 octane, it does not mean you got a quality product. Also gasoline as it sits will drop in octane. My uncle hauled gasoline for years, the Sunoco Ultra 94 comes out of the plant @ 108-111 Octane, but with it being mixed with the gas in the tanks that has been sitting, you are getting an average minimum of 94. If you have a few extra bucks, have a private company check the pumps you frequent, some of you might be surprised how high the acctual rating is on the gasoline you are pumping in your cars, the octane rating on the pump is the minimum the gasoline has to be be to meet state testing. My uncle said he had delivered a few loads to the stations and their high octane tanks were not low enough for the full load, and the managers just had them dump the excess into the lower octane tanks. This is something to think about the next time you go to the pumps...
Senior Member
Joined: Jan 2003
Posts: 8,079
From: union, new jersey
Originally Posted by Boostn7' date='Apr 2 2004, 10:05 PM
18 psi on pump (93-94 ocatne) all day long......
timing and A/Fs in the 10.8- 11.0 is the key
No race gas......the reason why my FJO wideband is still running awesome after one year.....
timing and A/Fs in the 10.8- 11.0 is the key
No race gas......the reason why my FJO wideband is still running awesome after one year.....
Senior Member
Joined: Sep 2002
Posts: 3,867
From: Maryland
Originally Posted by Boostn7' date='Apr 2 2004, 10:05 PM
18 psi on pump (93-94 ocatne) all day long......
timing and A/Fs in the 10.8- 11.0 is the key
No race gas......the reason why my FJO wideband is still running awesome after one year.....
timing and A/Fs in the 10.8- 11.0 is the key
No race gas......the reason why my FJO wideband is still running awesome after one year.....
An Aquamist setup might not be a bad idea though.
Senior Member
Joined: Aug 2002
Posts: 502
This is from an email I received from a friend of mine:
"I am running 20psi, but that is because I lowered the compression ratio
of the motor.
Boost pressure is really meaningless unless you are holding constant
intake charge temps, spark plug heat ranges, ignition timing (and how
precise the ECU controls it) and the compression ratio of the engine the
boost is going into.
In my case I have a huge intercooler, a turbo that is efficient in that
range, colder-than-stock plugs and the most advanced ignition controller
available on the market. Further, 20psi in my engine is the equivalent
of 18psi in a 9.0:1 engine. 18psi in a stock motor isn't really that
big of a deal as long as the other concerns are dealt with.
Best,
John"
"I am running 20psi, but that is because I lowered the compression ratio
of the motor.
Boost pressure is really meaningless unless you are holding constant
intake charge temps, spark plug heat ranges, ignition timing (and how
precise the ECU controls it) and the compression ratio of the engine the
boost is going into.
In my case I have a huge intercooler, a turbo that is efficient in that
range, colder-than-stock plugs and the most advanced ignition controller
available on the market. Further, 20psi in my engine is the equivalent
of 18psi in a 9.0:1 engine. 18psi in a stock motor isn't really that
big of a deal as long as the other concerns are dealt with.
Best,
John"
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