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Old 03-01-2006, 07:21 PM   #1
JM530
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Default Winter vs. "normal" Gas

Do you need to get retuned in the spring/summer if you get tuned in the winter in areas that use "winter" gas????
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Old 03-01-2006, 10:01 PM   #2
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Not so much for the winter gas, but also for the winter temps. If you have a normal tune, unles you have obvious issues, no. If you have a 10/10ths, to the edge race gas/WI OMFGBBQ tune, then yes, you need a summer and winter tune.
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Old 03-01-2006, 10:32 PM   #3
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Thank you, sir.
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Old 04-20-2006, 12:19 PM   #4
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so what's the difference between the two?
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Old 04-20-2006, 12:39 PM   #5
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Mainly the timing and fueling between the two tunes due to the colder denser air in the winter. In the summer, you're going to have increased det. res. due to more humid weather (at least on the EAST coast), which means that's actually less oxygen in the air for the motor to interact with the fuel. The summer blends of fuel (which is now @least 10% ethonal in every state, Maryland I learned last night is 15%) is the oxygenator in the fuel for the summer. The reaction upon burn provides more oxy as there is more of that in the chemical string. Basically it's for emissions more than anything else, to make sure that the fuel is burned in the CC rather in the tailpipe during the summer.
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Old 04-20-2006, 03:08 PM   #6
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Quote:
Originally Posted by J*Bishop
so what's the difference between the two?
The vapor pressure. Different chemical compounds change this so your car will supposedly run better in that particular season. So they cant use a light compound in the summer because it will evaporate too fast, or cause vapor lock. And they cant use a compound to heavy in the winter because the fuel wont vaporize properly and cause lean mixtures and hard starting etc etc. So they change the compounds per seasons....

I believe methyl tertiary butyl ether is the chemical that plays the major difference between summer and winter gas. I believe there is a good size list that go along with that but I think methyl tertiary butyl ether is at the top of that list......

I imagine warmer or colder climates dont even change there gas? I dunno.

You shouldnt have to tune around this in my opinion unless you have an all out race only car. But I'm running an OTS tune so what do I know
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Old 04-20-2006, 03:51 PM   #7
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Quote:
Originally Posted by CynicX
The vapor pressure. Different chemical compounds change this so your car will supposedly run better in that particular season. So they cant use a light compound in the summer because it will evaporate too fast, or cause vapor lock. And they cant use a compound to heavy in the winter because the fuel wont vaporize properly and cause lean mixtures and hard starting etc etc. So they change the compounds per seasons....

I believe methyl tertiary butyl ether is the chemical that plays the major difference between summer and winter gas. I believe there is a good size list that go along with that but I think methyl tertiary butyl ether is at the top of that list......

I imagine warmer or colder climates dont even change there gas? I dunno.

You shouldnt have to tune around this in my opinion unless you have an all out race only car. But I'm running an OTS tune so what do I know
well...MTBE was it until it just went bah-bye.
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Old 04-20-2006, 04:04 PM   #8
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thx guys. make a lil more sense now.
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Old 04-20-2006, 04:43 PM   #9
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Quote:
Originally Posted by sb427f-car
well...MTBE was it until it just went bah-bye.
last time I wanted to know the difference was YEEEEAAARRRRSSSS ago. What is with the MTBE going bah-bye?
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Old 04-20-2006, 07:13 PM   #10
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Quote:
Originally Posted by sb427f-car
The summer blends of fuel (which is now @least 10% ethonal in every state, Maryland I learned last night is 15%) is the oxygenator in the fuel for the summer.
i live in NJ and the fuel is 10% ethonal all year round...
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Old 04-20-2006, 08:20 PM   #11
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Quote:
Originally Posted by CynicX
last time I wanted to know the difference was YEEEEAAARRRRSSSS ago. What is with the MTBE going bah-bye?
It's a carcinogen. It leaches into the ground water and you can't get it out.
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