01-03-2010, 07:41 PM | #1 |
Drives: 89 Formula 350 Join Date: May 2009
Location: Calgary AB Canada
Posts: 53
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Why use premium gas?
Let me first say---I'd use it, no question.
My friend who has a Camaro SS refuses to fill it with premium. He doesn't think it needs it and won't pay out of principal. His idle has a slight fluctuation I have noticed. Give me some concrete reasons why he should.
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89 Formula 350 with alot of mods
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01-03-2010, 07:45 PM | #2 |
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He is also killing this hp #'s by doing this. It really slows them down to run anything other than premium. If it was a v-6 then it wouldn't matter.
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01-03-2010, 07:49 PM | #3 | |
Drives: 89 Formula 350 Join Date: May 2009
Location: Calgary AB Canada
Posts: 53
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Quote:
I think GM doesn't randomly specify premium fuel engines. Big turn off to alot of people and sometimes even a deal breaker.
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89 Formula 350 with alot of mods
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01-03-2010, 07:53 PM | #4 |
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Go through the threads on here and you will find that it's a lot more than 5hp lost over it. It does state to run premium in the SS or performance will be reduced.
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01-03-2010, 08:07 PM | #5 |
Drives: 2010 CAMARO. 10.04@133mph, 1.4 60' Join Date: Jul 2009
Location: Lafayette, Louisiana
Posts: 4,585
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the price of a tank of premium is only about $3 more than a tank of regular. there's more ways to save a couple dollars than making your engine have valve clatter and detonation
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01-03-2010, 08:14 PM | #6 |
Drives: 2010 2SS RS L99 Join Date: Oct 2008
Location: BUTLER, PA
Posts: 531
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If you go back to multiple threads, and dyno runs the low octane table loses you about 20 HP and 25 torque, just look at low dyno's verses heathy engines. At least with L99.
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01-03-2010, 08:17 PM | #7 |
Drives: 2010 CAMARO. 10.04@133mph, 1.4 60' Join Date: Jul 2009
Location: Lafayette, Louisiana
Posts: 4,585
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01-03-2010, 08:19 PM | #8 |
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The knock sensors are quick enough to pull timing to avoid damage, but the reduced fuel economy that will result negates any savings from useing a lower octane.
The power loss could be 20-25hp or more depending on how close the factory tune is. These cars have a 11:1 compression ratio....premium is a must! Bottom line is, why? We have a customer that spent the $$ for a new Z06...and he won't pay the extra for premium. Crazy! |
01-03-2010, 08:29 PM | #9 |
Whipped
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For us that have been here for a while we know that issue of filling up a L99 with low octane fuel. . . There's been many topics on this.
My 2003 SRT-4 actually pulled the boost and retarded the timing if you didn't use High test fuel.
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01-03-2010, 08:48 PM | #10 |
Drives: 2010 CAMARO. 10.04@133mph, 1.4 60' Join Date: Jul 2009
Location: Lafayette, Louisiana
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01-03-2010, 09:27 PM | #11 |
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Good point. A tuned car will still pull timing unless the knok detor settings are disabled or turned way down...and the only time we disable them is when doing a bracket tune for the drag racers that want to run the same# run after run. So you should still be safe even with a tune as long as the tuner is good. But we do see some tunes come in from a well known "traveling tuner" that disables it to cover for some tuning weaknesses he has...and have seen the melted pistons as a result.
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01-03-2010, 09:37 PM | #12 |
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Im going to run 87 all winter. It doesnt hurt anything. Your car will just switch to the low octane table. But expect it to be slower. No damage will occur, thats just stupid.
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01-03-2010, 10:32 PM | #13 | |
Emerald Coast Camaros
Drives: 2010 Supercharged RJT SS! Join Date: Jun 2009
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Quote:
It's the lope from the big engine it has lol.. Mine does it, and it tickles me to see the needle moving up and down at a stop light lol
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01-03-2010, 10:47 PM | #14 |
slicker
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ok then if it make that much diffrence in the SS. then why no difrence in the LT with a 6 under the hood. the manual says regular but i use mid grade from chevron so should i be useing regular or should i use premium
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