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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Engine tuning and/or modifications

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  #21  
Old 02-04-2006, 08:07 AM
jimmyjam's Avatar
jimmyjam jimmyjam is offline
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2006 Chevy TrailBlazer SS (LT)
White 402ci Other AWD
Join Date: Jun 2005
Location: clearwater fl
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Quote:
Originally Posted by blautens
Unless you know and trust the owner, they're business owners, and they buy anything they can sell at a profit, not always what's on the sign (not criticizing their right to make money here, by the way).
I'm usually the guy who defends people's right to make money. Hell, I think the gas companies are fine charging what they are charging since we are still willing to buy overpriced gas. but if they're advertising their gas as superior due to techron additive (not only signs on the pumps but also commercials), isn't that false advertising, and unethical?
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  #22  
Old 02-04-2006, 09:40 AM
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mattcincy mattcincy is offline
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2005 Chevy TrailBlazer LT
Graphite Metallic 4.2L I6 2WD
Join Date: Aug 2005
Location: Cincinnati, Ohio
Posts: 70
Quote:
Originally Posted by blautens
Here's the only problem with trying to buy what you think is top tier gas...it's very tough to tell where a station is getting gas from, unless it's company owned (and very few gas stations aren't actually franchises)...

I can't tell you how many Chevron's I've seen fill up with brand x gas...(and others). Unless you know and trust the owner, they're business owners, and they buy anything they can sell at a profit, not always what's on the sign (not criticizing their right to make money here, by the way).

Just a fact of life, at least around here. Of almost more importance is the age of the tank in the ground...the older the tank, the more likely something is in it you really don't want.
All of the UST's(underground Storage Tanks) have had to be replaced in the past 5 years or so. The age of the tanks is not a problem anymore. That's one of the reasons you have seen alot of stations shuting down since y2k.

However, there are states that don't make it mandatory for the station owners to actually sell the grade of gas they are advertising. I know that sounds crazy but we print a gasoline dealers newsletter here in Cincinnati, and in the state of Ohio, you can advertise 93 and be selling 87. That isn't true in all states; I know Kentucky and Indiana has to sell what they advertise but those three are all I know.

Your Government at work!

Matt
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  #23  
Old 02-04-2006, 11:03 AM
Vector MS Vector MS is offline
 
Join Date: Dec 2005
Posts: 38
You can not hurt your engine running 91 octaine fuel or slightly bad fuel with the 93 octane tune. The Vector tune does not change the sensitivity of the knock sensors at all. The factory knock sensors will pull up to 15 degrees of timing if needed. That is more than half of the total timing.

Remember, these engines knock 3-4 degrees with the best 93 octain fuel you can run -From The Factory. With the 91 octane I see 6-7 degrees and hear it knock on a hard downshift - With the factory calibration.

In the owners manual "...use premium unleaded gasoline with a posted octane of 91 or higher. You may also use regular unleaded gasoline rated at 87 octane or higher, but your vehicles acceleration may be slightly reduced, and you may notice a slight audible knocking noise, commonly referred to as spark knock"


The factory is running these engines "on the knock sensors" all of the time. To make this much HP you need high compression and a lot of timing.

Through peak cylinder pressure we have no added timing.

I am just trying to state that a little pinging is not harmful to your engine. With the Vector tune I see NO knock when running 93 octane fuel, with the stock calibration I see 3 degrees.
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  #24  
Old 02-04-2006, 12:44 PM
TonyGXP TonyGXP is offline
 
Join Date: Dec 2005
Posts: 2,026
Quote:
Originally Posted by Vector MS
You can not hurt your engine running 91 octaine fuel or slightly bad fuel with the 93 octane tune. The Vector tune does not change the sensitivity of the knock sensors at all. The factory knock sensors will pull up to 15 degrees of timing if needed. That is more than half of the total timing.

Remember, these engines knock 3-4 degrees with the best 93 octain fuel you can run -From The Factory. With the 91 octane I see 6-7 degrees and hear it knock on a hard downshift - With the factory calibration.

In the owners manual "...use premium unleaded gasoline with a posted octane of 91 or higher. You may also use regular unleaded gasoline rated at 87 octane or higher, but your vehicles acceleration may be slightly reduced, and you may notice a slight audible knocking noise, commonly referred to as spark knock"


The factory is running these engines "on the knock sensors" all of the time. To make this much HP you need high compression and a lot of timing.

Through peak cylinder pressure we have no added timing.

I am just trying to state that a little pinging is not harmful to your engine. With the Vector tune I see NO knock when running 93 octane fuel, with the stock calibration I see 3 degrees.
I guess that's why you guys do what you do then...No knock with the Vector & 3* with the factory set up?? If that's accurate, I'm sold..Have any of your testers reported knock?? cause if what you say is true, how did we have a member say they heard pinging?? is that to be considered an enomoly? Iappreciate all the quick responses by the way, and in no way am I criticizing any vector tuners..
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  #25  
Old 02-04-2006, 12:59 PM
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Fishhunter911 Fishhunter911 is offline
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Like I said it was only a split second on cheap gas... then went away, takes a lil time to retard the timing. no biggie

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