Gas for v6?

[stevey_frac]

Originally Posted by ChibiBlackSheep

I would imagine it is very similar to the LLT. Although I have never had my HPT hooked up to one.

We need to get an LLT on an HPT and compare.

I've typically used 87 octane, and I've never really noticed a difference. That doesn't mean it doesn't make more power though. I'm not normally driving balls to the walls to notice on the street either.

--Steve

[Dale_K]

Do the two timing chart graphs both represent a bone stock situation? In other words did the stock ECM programing adjust to the higher levels or did it take an aftermarket tuner to achieve it?

Does anyone have a dyno comparison on a bone stock V6 between 87 and 91? If premium is worth 30 hp I might have to make the switch.

[wayne watson]

sorry, i bet you were expecting a chart

[MADBADGER]

Run 87. The lower the octane number the more energy is in the fuel. High octane is for high compression (to prevent pre - ignition or knocking or running like a diesel engine) if your V6 was turned for low octane you gain more by running 87. You will lose performance if you put 93 in it.

[homewrecker]

What do you guys think of filling with 87 at Chevron or shell and using techron one time a month?

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[GretchenGotGrowl]

Originally Posted by MADBADGER

Run 87. The lower the octane number the more energy is in the fuel. High octane is for high compression (to prevent pre - ignition or knocking or running like a diesel engine) if your V6 was turned for low octane you gain more by running 87. You will lose performance if you put 93 in it.

Using your logic then the L99, LS3 and LSA owners should be screaming for less than 87 octane because it has more energy than 87 and their engines have quite a bit LESS compression than the LLT and LFX.

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[stevey_frac]

Originally Posted by MADBADGER

Run 87. The lower the octane number the more energy is in the fuel. High octane is for high compression (to prevent pre - ignition or knocking or running like a diesel engine) if your V6 was turned for low octane you gain more by running 87. You will lose performance if you put 93 in it.

What? No...

Around here, 93 actually has MORE energy in it, because it contains less ethanol than the 87. (87 is up to 10% Ethanol, 91 is 0%).

The worst case is your ECU doesn't account for the additional octane, and doesn't advance your ignition timing. This is pretty much a wash power wise.

[GretchenGotGrowl]

Originally Posted by stevey_frac

That's fascinating... Great post by the way. Can anyone corroborate this for the LLT?

I think we will see people posting the spark tables for the LLT as soon as HP Tuners releases the newest vervion. However, if you search the V6 LLT section of the forum you can probably find the post where a guy provided dyno numbers for 87 and 93 octane. He got a ~5 hp bump without tuning for it. That's not a huge gain, but that and one of Scrming's threads confirm that the LLT pulls timing on 87 octane and you can benefit from running higher octane fuel.

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[MagnumForceGB]

Originally Posted by MADBADGER

Run 87. The lower the octane number the more energy is in the fuel. High octane is for high compression (to prevent pre - ignition or knocking or running like a diesel engine) if your V6 was turned for low octane you gain more by running 87. You will lose performance if you put 93 in it.

Jesus Christ...

Why does everybody think that 91/93 octane burns slower or has less energy than 87?

Read this:
http://www.contactmagazine.com/Issue...ineBasics.html

[stevey_frac]

Originally Posted by GretchenGotGrowl

I think we will see people posting the spark tables for the LLT as soon as HP Tuners releases the newest vervion. However, if you search the V6 LLT section of the forum you can probably find the post where a guy provided dyno numbers for 87 and 93 octane. He got a ~5 hp bump without tuning for it. That's not a huge gain, but that and one of Scrming's threads confirm that the LLT pulls timing on 87 octane and you can benefit from running higher octane fuel.

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I recall that thread. But 5 HP for $40 / month forever doesn't seem worth it.

The LFX looks like it's doing a LOT more adjustment with nearly 20 degrees of timing change. I'd be surprised if that's only a 5 HP bump.

[GretchenGotGrowl]

Originally Posted by stevey_frac

I recall that thread. But 5 HP for $40 / month forever doesn't seem worth it.

The LFX looks like it's doing a LOT more adjustment with nearly 20 degrees of timing change. I'd be surprised if that's only a 5 HP bump.

It is definitely a matter of preference. Remember, if you put 87 in a SS it will just switch to the low octane table. I don't know how much less power it will make, but it will be less. Those could save even more money than you if they wanted to; most probably prefer not to.

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[DSX_Camaro]

IIRC L99 SS guys have stated that 87 gets them into the 300whp range stock. For what it's worth.

[stevey_frac]

You're suggesting that it's about 20 HP for an L99? vs 5 HP for the LLT?

(I'm assuming an L99 should have something like 20% drivetrain loss?

[skibik]

Originally Posted by jd10013

no, your required to run a gas with a minimum of 87. kind of funny how you'll put all those performance parts on your car then go the lowest required grade of gas.

That is what I said. What did you not understand you just worded it differently. We need to run 87 octane minimum is the same meaning as needing to run a minimum of 87 octane. I didn't realize I had to phrase it a different way just so you could understand it!

What do you mean "all my performance parts". I don't have anything I would call performance parts!