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Old 08-20-2008, 05:14 PM   #1
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Hmm...higher octane?

So, I was thinking about this, if we reflashed the ecu to run on 93 octane... I wonder how much hp we would gain...?
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Old 08-21-2008, 02:48 AM   #2
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I don't know. Maybe a bunch, maybe none at all. Not sure.
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Old 08-21-2008, 02:50 AM   #3
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probably not that much only so much can be earned throught timing.and timings is all you gain with higher octane fuel
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Old 08-21-2008, 12:49 PM   #4
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Apparently, the L76 in the G8 GT gains near 40hp when reflashed for premium...

I wonder what role the Direct Injection and VVT could play as far as timing and increased power output. The potential could be great.
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Old 08-21-2008, 01:07 PM   #5
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Quote:
Originally Posted by Dragoneye View Post
Apparently, the L76 in the G8 GT gains near 40hp when reflashed for premium...

I wonder what role the Direct Injection and VVT could play as far as timing and increased power output. The potential could be great.
That's a great thought! We need to test this out when HPTuners becomes available with a variety of octanes.
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Old 08-21-2008, 01:13 PM   #6
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Quote:
Originally Posted by Dragoneye View Post
Apparently, the L76 in the G8 GT gains near 40hp when reflashed for premium...

I wonder what role the Direct Injection and VVT could play as far as timing and increased power output. The potential could be great.
This is true, but it's also entirely possible that because of the actual function of VVT (adjust timing to avoid knock) and the complex algorithms in the ECM from the factory, this gain could be totally very small or totally negated.
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Old 08-21-2008, 02:45 PM   #7
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Quote:
Originally Posted by Dragoneye View Post
Apparently, the L76 in the G8 GT gains near 40hp when reflashed for premium...

I wonder what role the Direct Injection and VVT could play as far as timing and increased power output. The potential could be great.
IF, and thats a big if, the LLT gains about the same, we could see 330hp at the wheels with just a tune, cai and exhaust Thats Pretty nice for a v6 with minor mods.
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Old 08-21-2008, 03:06 PM   #8
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Its more horses than the challenger R/T has, and still lighter too. But would you really need to reflash for premium to gain that much? Maybe just a dyno tune in general would do the trick.
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Old 08-21-2008, 03:12 PM   #9
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Quote:
Originally Posted by Shadowsong View Post
IF, and thats a big if, the LLT gains about the same, we could see 330hp at the wheels with just a tune, cai and exhaust Thats Pretty nice for a v6 with minor mods.
In another spread, there was a post that suggested that we could see even more benefit than that without endangering the motor.
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Old 08-21-2008, 03:13 PM   #10
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In another spread, there was a post that suggested that we could see even more benefit than that without endangering the motor.
Got a link? I'd like to read into it
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Old 08-24-2008, 03:56 PM   #11
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Originally Posted by Shadowsong View Post
IF, and thats a big if, the LLT gains about the same, we could see 330hp at the wheels with just a tune, cai and exhaust Thats Pretty nice for a v6 with minor mods.
That 40 HP bump was on a V8, with two more cylinders realizing a power gain.

And 330HP at the wheels is close to 380HP at the crank, the same amount of HP the stock L76 (6.0L V8) makes.

Also, the power may be 330 HP at the wheels, but what is the average HP compared to an equivalent HP V8? Probably a lot less, with torque also being less.

I agree, the power gains for the V6 sound very impressive for a cheaper motor (than the V8), but I don't want people to think that their V6 will be a V8 beater...(well maybe a GT beater )
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Old 08-24-2008, 08:25 PM   #12
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Originally Posted by XanthosV6 View Post
Its more horses than the challenger R/T has, and still lighter too. But would you really need to reflash for premium to gain that much? Maybe just a dyno tune in general would do the trick.
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Well, what exactly do you think you're tuning on the dyno? Yup, you're tuning the fuel map of ECU (aka-flashing)! So essentially you're referring to the exact same thing.
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Old 08-24-2008, 10:45 PM   #13
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the direct injection engine doesnt benefit allot from changing the octane because it injects the fuel directly into the cylinder right before the apex of the cylinder stroke so it. so there is no threat of detonation.
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Old 08-25-2008, 01:11 AM   #14
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The engine control probably will be able to detect the octane level and make adjustments without programming anything. That's part of how high compression engines self tune to reduce knock.
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