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Old 06-18-2013, 11:25 AM   #26
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And yours is locked in low octane mode....on one of the fill ups you THINK is premium. Do you do a fuse pull every month? If not, your probably at low octane mode now.

Quote:
Originally Posted by KlugSS View Post
Problem with running low quality low octane gasoline is your car will be locked into low octane mode even if you decide to run 91+ so you will not feel a difference in power since you are still running timing for low octane. You would have to a fuse pull every fill up of higher quality higher octane fuel.

I locked mine in high octane mode all the time. It never runs lower timing.

This post I made in a fuse pull thread but it still explains why people that run shit gas don't feel the power increase when running better gas. There IS a difference.
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Old 06-18-2013, 11:44 AM   #27
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And yours is locked in low octane mode....on one of the fill ups you THINK is premium. Do you do a fuse pull every month? If not, your probably at low octane mode now.
I don't pull the fuse. I used hp tuners to copy the high octane timing map over to the low octane table. That way it's always running the timing for higher octane fuel even if it switches maps.
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Old 06-18-2013, 11:44 AM   #28
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Side question: Do the 2013's still need a fuse pull when 87 is run? Or was it only a problem on the 10-12s?
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Old 06-18-2013, 11:54 AM   #29
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Originally Posted by KlugSS View Post
I don't pull the fuse. I used hp tuners to copy the high octane timing map over to the low octane table. That way it's always running the timing for higher octane fuel even if it switches maps.
So, in the scenario that Suzook presented (87 octane fuel coming out of a 91/93 octane pump), you're running a high-octane map with low-octane fuel?

You crazy.
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Old 06-18-2013, 11:55 AM   #30
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10.7:1 Static compression is way too high on a non overlap cam to run 87.

Static compression is the difference in cylinder volume between the bottom of the stroke and the top. It does not correlate directly to the actual compression your engine is making. You toss in a cam with a lot of duration and overlap and you need to up your compression ratio to compensate for all the loss caused by your piston being on its way back up before both valves are shut and then actually starting to squeeze the air fuel mixture. Then you have volumetric efficiency to factor in. that is how well your engine fills the cylinder on it's suction stroke. Look on comp cams website, once you start getting into the big cams they spec a minimum 11.5:1 static compression.

So you put a big duration cam in the Camaro you may be able to run lower octane fuel as your actual compression may be down. The stock LS3 has no overlap and high volumetric efficiency, gonna squeeze all of that 10.7:1, needs at least 91 to avoid detonation.

You run 89 or 97 and your engine is going to pull timing and add fuel to avoid detonation. This leads to lower performance and mileage.

I have the L9H 6.2 in my truck. I read on another forum (Chevy truck forum) of a user who ran 89 in his truck and recorded the data and then switched to 91. The mileage increase covered the extra cost of the fuel. Not to mention the weeee factor of having peak performance. I ran the same test myself and got the same results. The truck was also noticeably more sluggish. Never ran the test with 87, that would be stupid on a high compression motor.
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Old 06-18-2013, 11:56 AM   #31
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Side question: Do the 2013's still need a fuse pull when 87 is run? Or was it only a problem on the 10-12s?
I don't see why anything would be different. I don't think it's just a camaro thing either.
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Old 06-18-2013, 12:03 PM   #32
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So, in the scenario that Suzook presented (87 octane fuel coming out of a 91/93 octane pump), you're running a high-octane map with low-octane fuel?

You crazy.
It's still on a factory timing table, it's not aggressive at all. I wouldn't worry about it one bit. Besides that, GM had perfected their knock sensors long time ago and I have faith in them. This isn't the only vehicle I do this with. Plus how many people put 87 in then go do WOT passes.

I have never seen enough knock on a factory high octane map when running 87 to care.
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Old 06-18-2013, 12:07 PM   #33
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Quote:
Originally Posted by KlugSS View Post
It's still on a factory timing table, it's not aggressive at all. I wouldn't worry about it one bit. Besides that, GM had perfected their knock sensors long time ago and I have faith in them. This isn't the only vehicle I do this with. Plus how many people put 87 in then go do WOT passes.

I have never seen enough knock on a factory high octane map when running 87 to care.
Interesting. I'll look into that further.
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Old 06-18-2013, 12:32 PM   #34
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Quote:
Originally Posted by KlugSS View Post
It's still on a factory timing table, it's not aggressive at all. I wouldn't worry about it one bit. Besides that, GM had perfected their knock sensors long time ago and I have faith in them. This isn't the only vehicle I do this with. Plus how many people put 87 in then go do WOT passes.

I have never seen enough knock on a factory high octane map when running 87 to care.
Another reason 87 won't hurt the motor. I'm not "knocking" anyone...that's why we have choices. I haven't seen a motor damaged due to engine knock in many years...it just doesn't happen on modern street cars anymore.
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Old 06-18-2013, 12:39 PM   #35
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My thoughts are I don't care what other people run in their car.
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Old 06-18-2013, 12:59 PM   #36
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How did I contradict myself? I gave a brief synopsis of the topic and asked what others thought of this member's logic.
Because you didn't have to mention his name in the first place to ask the question. Adding the emoticon for "respect" doesn't mean anything if not long afterwards you bash his logic by saying why buy a 45k car and filling it with 87 and asking for comments. You already know what most are going to respond.
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Old 06-18-2013, 01:09 PM   #37
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Because you didn't have to mention his name in the first place to ask the question. Adding the emoticon for "respect" doesn't mean anything if not long afterwards you bash his logic by saying why buy a 45k car and filling it with 87 and asking for comments. You already know what most are going to respond.
Its all good. I'm not offended. We all have opinions, and I'm always up for a good debate. After all...its my $...I get to do what I want to with it.
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Old 06-18-2013, 01:58 PM   #38
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Because you didn't have to mention his name in the first place to ask the question. Adding the emoticon for "respect" doesn't mean anything if not long afterwards you bash his logic by saying why buy a 45k car and filling it with 87 and asking for comments. You already know what most are going to respond.
I never bashed his logic or anything of the sort. I asked if others have heard of people strictly using 87 in their SS's. Eh, whatever. No big deal.
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Old 07-02-2013, 10:29 AM   #39
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So I caved and tried putting in 93 and did the fuse pull overnight....I don't notice a difference...is it that noticeable? Idk...seems like a waste.
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Old 07-02-2013, 11:24 AM   #40
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I've heard / read several threads on whether or not running on 89 or lower will cause harm to the engine and its components and I have seen mixed opinions.

However, does saving $3-$6 each fill up provide enough justification for me to gamble with these types of odds. No....no it does not. I ONLY use Shell V-Power 93 Octane fuel for my 2SS and my 2SS thanks me for that.
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Old 07-02-2013, 12:04 PM   #41
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I've heard / read several threads on whether or not running on 89 or lower will cause harm to the engine and its components and I have seen mixed opinions.

However, does saving $3-$6 each fill up provide enough justification for me to gamble with these types of odds. No....no it does not. I ONLY use Shell V-Power 93 Octane fuel for my 2SS and my 2SS thanks me for that.
But I'm wondering if there really is a 30-40 HP difference like people are claiming....I WOULD be able to feel 30-40 HP...5or10...not really.
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Old 07-02-2013, 01:29 PM   #42
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But I'm wondering if there really is a 30-40 HP difference like people are claiming....I WOULD be able to feel 30-40 HP...5or10...not really.
you can compare the 0-60 times, there will be a difference. that's partly how the fuse pull mod was verified.
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Old 07-02-2013, 01:41 PM   #43
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I run diesel in mine no difference in performance and I get great mileage
Why waste your money on diesel?!
Go to a Military Base and buy Jet Fuel! Man I noticed a huge difference and dyno like 100HP! More!
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Old 07-22-2013, 06:57 AM   #44
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Here's the thread (page 2 towards the bottom): http://www.camaro5.com/forums/showthread.php?t=302162

I'm not trying to call this guy out (suzook), but he claims he runs 87 in his SS all the time because most gas stations have 87 in their 93 pumps anyways. Also, he claims it doesn't make that big of a difference in performance. Does anybody else do it? I've always run 93 in mine from day one and read all about the fuse pull. If folks are trying to save money, why not just buy a V6 and run 87 all day? You buy a $45 SS, then fill it with 87 to pinch a few pennies? What are your thoughts?
DRKS1D3,

In my Impala SS it specifically say you can run 87 in the engine with reduced performance results. I always run 91 according to the manual.

Recently I also bought a new Camaro 2LT/RS and it runs fine with 87 but once per month I'll run 89.

If that guy wants to run 87 in his SS then he could with mixed results in performance. If it pings when he hits the gas well that's another thing. I hate pinging in my motors so that's why I prefer the higher octane if I can afford it.

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Old 09-16-2013, 11:49 AM   #45
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Why waste your money on diesel?!
Go to a Military Base and buy Jet Fuel! Man I noticed a huge difference and dyno like 100HP! More!
Military jet fuel, ex JP8, is pretty much diesel with additives, and I know you are messing around. Just a little info
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