Reading the owners manual, it says 89 gasoline is recommended as it using Top Tier gasoline. The only Top Tier gasoline available locally does not hav

[Mountain Whiskey]

Bruh, we only put the camper in a Walmart parking lot once and didn't even sleep there. Ate a football sized burrito, picked up a couple things at Harbor Freight, then went and slept at the ******* Barrel.

Dude, the Cr@cker censor is just too funny! I almost my shorts laughing!

 

[Dewey]

Dude, the Cr@cker censor is just too funny! I almost my shorts laughing!

On another forum I was on Amish was censored. No idea why and even if it was offending to them they’d never even see it.

 

[HSKR R/T]

Always wondered about the whole alcohol fuel thing. I mean, they run it racing right? It does not seem like you would run something with less power.

I guess the engines are not set up for either fuel efficiency or longevity though. Are they super high compression to get the power out of alcohol fuel?

It seems it would take more than a tweak in the tune to use high alcohol ratio fuel in a regular street motor but I am glad to see it works. Options are always good.

The NA Hemis have decent compression from factory. Another benefit of ethanol, at least with E85, is you can safely run more timing than on 87, 89, 91, or 93.

 

[theblet]

It’s not handicapping tho. 87 is running normally, and 89 is boosting for more power. Wish someone had the dyno results of both pulls to compare.

 

[HSKR R/T]

It’s not handicapping tho. 87 is running normally, and 89 is boosting for more power. Wish someone had the dyno results of both pulls to compare.

It's actually the opposite. 89 is normal timing. 87 is retarded timing. When the PCM has to retard timing it's not running "normally"

 

[theblet]

Then why does the owners manual condone it? How do you know that the ecu doesn’t just advance timing for 89 and is normal for 87?

 

[Dewey]

It’s not handicapping tho. 87 is running normally, and 89 is boosting for more power. Wish someone had the dyno results of both pulls to compare.

89 is only for high performance Hemi’s with 3.92’s.

 

[SnowBlaZR2]

Then why does the owners manual condone it?

 

[HSKR R/T]

Then why does the owners manual condone it? How do you know that the ecu doesn’t just advance timing for 89 and is normal for 87?

The PCM can't tell what octane fuel you have in it. There are knock sensors on the engine that detect knock, aka detonation. When running lower octane there is greater chance for detonation. When the knock sensors detect that it tells the PCM to retard the timing to prevent it from damaging the engine. The knock sensors can detect detonation well before it becomes audible. The only time the PCM will "advance" timing is when it stops detecting detonation and will return it back to "normal" base timing of the tune.

 

[theblet]

The PCM can't tell what octane fuel you have in it. There are knock sensors on the engine that detect knock, aka detonation. When running lower octane there is greater chance for detonation. When the knock sensors detect that it tells the PCM to retard the timing to prevent it from damaging the engine. The knock sensors can detect detonation well before it becomes audible. The only time the PCM will "advance" timing is when it stops detecting detonation and will return it back to "normal" base timing of the tune.

Well, I guess my truck with continue to be retarded until I need to tow.

 

[WXman]

87 octane for a V8. Unless you want to just set money on fire......

 

[theblet]

87 octane for a V8. Unless you want to just set money on fire......

Love this show. I watch it every week.

 

[HSKR R/T]

87 octane for a V8. Unless you want to just set money on fire......

All depends on what your tune is meant for. If you have a tune designed for 93 octane and you run 87 octane you will destroy your combustion chambers with detonation. Read above where I explained how the knock sensors work on these trucks. If you have a tune for higher octane fuel and run a lower octane and get detonation. The PCM will reduce timing, effectively cancelling out the better any benefit the higher timing gave you. So while you CAN run 87, it will reduce the performance of the engine as the PCM pulls timing.

So talk about setting money on firez you paid for a truck tuned for best performance on 89 octane and effectively choose to not run the engine at it's optimum performance, effecting both horsepower and fuel mileage.

 

[ferraiolo1]

Preach ^


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[Majortom]

Actually, you should re-read that. He didn't say you could use E85. He said you can use up to 15% ethanol, which is correct. Your last 2 statements are wrong. Alternative Fuels Data Center: E85 (Flex Fuel)

Work on your fuel math. E85 is 85%, but most pumos will guarantee 70% or better. E-88 is "up to" 15%. Most other grades are "up to" 10%.

Mea culpa. I was thinking E85 was 15% ethanol. To quote Rick Perry: ”Oops”

 

[Idahoktm]

All depends on what your tune is meant for. If you have a tune designed for 93 octane and you run 87 octane you will destroy your combustion chambers with detonation. Read above where I explained how the knock sensors work on these trucks. If you have a tune for higher octane fuel and run a lower octane and get detonation. The PCM will reduce timing, effectively cancelling out the better any benefit the higher timing gave you. So while you CAN run 87, it will reduce the performance of the engine as the PCM pulls timing.

So talk about setting money on firez you paid for a truck tuned for best performance on 89 octane and effectively choose to not run the engine at it's optimum performance, effecting both horsepower and fuel mileage.

That doesn't make sense to me. In the video, the same timing was optimum for 87 and 91 octane fuel. If what you're saying is true, that engine would have required different timing for each fuel to get peak performance. That motor has 10.7:1 compression and makes more HP and torque than the stock 5.7 Hemi, so why would the stock Hemi with 10.5:1 compression pistons need more than 87 octane to provide peak power?

 

[HSKR R/T]

That doesn't make sense to me. In the video, the same timing was optimum for 87 and 91 octane fuel. If what you're saying is true, that engine would have required different timing for each fuel to get peak performance. That motor has 10.7:1 compression and makes more HP and torque than the stock 5.7 Hemi, so why would the stock Hemi with 10.5:1 compression pistons need more than 87 octane to provide peak power?

One video on YouTube isn't the end all be all for how it works. If there was no need for different octane levels, the oil companies wouldn't make different octane levels. And tuners wouldn't require certain octane levels based on the tune. If you understand how octane works, then that video is what doesn't make sense

Edit: watched video again, even though I had in the past, just to refresh my memory. They explain in the beginning why none of them would run 87 in that engine in the street. Octane is just a resistance to detonation. The power potential of the fuel doesn't change.

 

[SnowBlaZR2]

Do they address the software in the video?

 

[WXman]

All depends on what your tune is meant for. If you have a tune designed for 93 octane and you run 87 octane you will destroy your combustion chambers with detonation. Read above where I explained how the knock sensors work on these trucks. If you have a tune for higher octane fuel and run a lower octane and get detonation. The PCM will reduce timing, effectively cancelling out the better any benefit the higher timing gave you. So while you CAN run 87, it will reduce the performance of the engine as the PCM pulls timing.

So talk about setting money on firez you paid for a truck tuned for best performance on 89 octane and effectively choose to not run the engine at it's optimum performance, effecting both horsepower and fuel mileage.

..........which is exactly why they said multiple times that you should use the lowest octane you can without detonation. And the Ram doesn't detonate at 87 octane because the tune is designed for it per the Ram owners manual.

So basically you just told us nothing.

 

[ferraiolo1]

Lol it does noticeably detonate under load with 87. Meaning while not under a large load it doesn’t do it quite as bad and most don’t notice. But the computer catches it and retards the timing pulling some performance.

Thus why they recommend 89 for best performance and mpg.

Or maybe ram
Is in with big oil and wants you to spend money


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