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ZL1 fuel question part 2 #5323976 01/15/20 10:44 PM
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dbvettez061 Offline OP
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91 octane is the best I can get here in western Colorado at 4500 feet elevation. Shell has 91 octane pure gas
Would that be better than regular Shell 91 octane??
Thanks in advance.


2001 Z06 Forged Blown Stroked 650 RWHP 645 RWTQ
Vietnam Vet 5thSFGA
Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324012 01/15/20 11:53 PM
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y_p_w Offline
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Not really. Certainly not better performance. I've even heard some claims that E10 might have better performance because you're throwing in oxygen right in the fuel. I mean - there's all these convoluted things done to try and increase the amount of oxygen in the charge, including forced induction, multi valves, polished intakes, etc.

I certainly wouldn't pay a huge premium for it.

Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324111 01/16/20 06:52 AM
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JHZR2 Offline
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I assume you’re at high elevation - iirc, at higher elevation octane requirements drop.

It has never been compelling to me to pay a premium for pure gas, as the mpg improvements don’t make up the cost.

Ethanol does have higher octane rating, which is why e85 is favorable to some.

Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324185 01/16/20 08:28 AM
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dbvettez061 Offline OP
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I don’t care about mpg. Just wanting to optimize the performance of the ZL1.


2001 Z06 Forged Blown Stroked 650 RWHP 645 RWTQ
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Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324273 01/16/20 10:08 AM
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splinter Offline
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Originally Posted by dbvettez061
Just wanting to optimize the performance of the ZL1.
Been to Bandimere for a baseline?


PUP 0W-40
Total Quartz 5W-40
M1 5W-50

Past performance is no guarantee of future results.
Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324304 01/16/20 10:47 AM
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racin4ds Offline
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If Shell 91 is all you can get then I'm sure it will be ok, is this a stock Zl1? or is it heavily modded like the car in your sig?

Ethanol (E10) fuel is oxygenated to some degree so I'd think it would work better in your performance car than plain gas.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
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Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324309 01/16/20 10:51 AM
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dbvettez061 Offline OP
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It has a axel back dual stage exhaust. Will add a good CAI this spring but that’s it. Want to keep it under warranty for the next 6 years

Last edited by dbvettez061; 01/16/20 10:52 AM.

2001 Z06 Forged Blown Stroked 650 RWHP 645 RWTQ
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Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324322 01/16/20 10:59 AM
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Linctex Online Content
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Originally Posted by dbvettez061
Owners manual says NO E10.


How is that possible?

Many markets have only E10


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: ZL1 fuel question part 2 [Re: Linctex] #5324430 01/16/20 12:42 PM
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y_p_w Offline
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Originally Posted by Linctex
Originally Posted by dbvettez061
Owners manual says NO E10.


How is that possible?

Many markets have only E10

I don't believe that's the case with the Camaro ZL1. I found a copy of the Camaro High Performance Owners' Manual Supplement. It's on page 33 and it looks like anything up to E15 is approved. It is different in that the base model Camaros recommend at least 87, the higher performance models recommend at least 91 with 87 acceptable if 91 isn't available. That one recommends 93 but says 91 is the minimum acceptable AKI rating. I had to reassemble the order. It's really weird how it seemed out of order with a cut and paste.

Quote
https://my.chevrolet.com/content/da...performance-owners-manual-supplement.pdf
Fuel
GM recommends the use of TOP TIER detergent gasoline to keep the engine cleaner and reduce engine deposits. See www.toptiergas.com for a list of TOP TIER detergent gasoline marketers and applicable countries.

Do not use any fuel labeled E85 or FlexFuel. Do not use gasoline with
ethanol levels greater than 15% by volume.

Use premium unleaded gasoline meeting ASTM specification D4814
with a posted octane rating of 93.

If unavailable, unleaded gasoline with a posted octane rating of 91 may be used, but with reduced performance and fuel economy.
If the octane is less than 91, the engine could be damaged and the repairs would not be covered by the vehicle warranty. If heavy knocking is heard when using gasoline rated at 93 octane, the engine needs service.

Prohibited Fuels
Caution
Do not use fuels with any of the following conditions; doing so may damage the vehicle and void its warranty:
. For vehicles which are not FlexFuel, fuel labeled greater than 15% ethanol by volume, such as mid-level ethanol blends (16 – 50% ethanol), E85, or FlexFuel.

Re: ZL1 fuel question part 2 [Re: dbvettez061] #5324444 01/16/20 01:02 PM
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People run E85 mixed with 93 octane with a flex fuel sensor in their ZL1.

But that's with no catalytic converters.

Re: ZL1 fuel question part 2 [Re: Linctex] #5324489 01/16/20 02:33 PM
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Pew Offline
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Originally Posted by Linctex
Originally Posted by dbvettez061
Owners manual says NO E10.


How is that possible?

Many markets have only E10


That just made 99% of the US ineligible for one.

Re: ZL1 fuel question part 2 [Re: Pew] #5324492 01/16/20 02:38 PM
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y_p_w Offline
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Originally Posted by Pew
Originally Posted by Linctex
Originally Posted by dbvettez061
Owners manual says NO E10.


How is that possible?

Many markets have only E10


That just made 99% of the US ineligible for one.

The vast majority of the fuel sold in the US does use ethanol, but I'm not sure that the maximum is always the case. Using oxygenates is almost a no brainer given that it's both cheaper than non-oxygenated gasoline and it's the easiest octane booster to use.

I know there are some regions where the demand for premium is low, and even where E0 93 AKI premium is the norm. However, there's no way that would be likely in a place like California where there's a huge demand for premium. They would need to waste fuel to get the numbers to work even if 87 and 89 were E10 but 93 was E0.

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