5.0 + E85 Fuel

[Chili]

What would a 5.0L in a regular cab, rwd truck running e85 do in the 1/4 mile? Stock. I see the 24's are all going to have 3.73 gears and I think they will be a hoot.

I was thinking high 12's on 93 octane, mid 12's on E85. Am I too optimistic? I was thinking around 1 second faster than a crew cab 4wd with 20's and a bunch of options. These XL's with small wheels have to be very light.

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[JExpedition07]

What would a 5.0L in a regular cab, rwd truck running e85 do in the 1/4 mile? Stock. I see the 24's are all going to have 3.73 gears and I think they will be a hoot.

I was thinking high 12's on 93 octane, mid 12's on E85. Am I too optimistic? I was thinking around 1 second faster than a crew cab 4wd with 20's and a bunch of options. These XL's with small wheels have to be very light.

I think 12’s is realistic. In a 10 spd trans a 3.31 vs 3.73 should not effect your 1/4 mile, only 0-60. The taller gears pull harder in upper speeds and gears, shorter gears pull harder down low. By the time you hit the limiter they will be matched/tied.

 

[Chili]

I think 12’s is realistic. In a 10 spd trans a 3.31 vs 3.73 should not effect your 1/4 mile, only 0-60. The taller gears pull harder in upper speeds and gears, shorter gears pull harder down low. By the time you hit the limiter they will be matched/tied.

If you have the traction, that increased bottom end will also lower your 60' time. Old drag racing math is .1 in a 60 foot is .2 in the 1/4. Always held true for me too.

The shorter gear means you decrease your power band window keeping the engine at a higher rpm and less rpm drop on gear changes. The flip side is another shift may be needed in the 1/4 and if that's so that will counter some of the other gains. With how fast the 10 speed shifts and the 5L redline was bumped to 6800, the gear still yield an improvement.

Most importantly, they're more fun. Especially when you already have a 32" tire.

 

[JExpedition07]

If you have the traction, that increased bottom end will also lower your 60' time. Old drag racing math is .1 in a 60 foot is .2 in the 1/4. Always held true for me too.

The shorter gear means you decrease your power band window keeping the engine at a higher rpm and less rpm drop on gear changes. The flip side is another shift may be needed in the 1/4 and if that's so that will counter some of the other gains. With how fast the 10 speed shifts and the 5L redline was bumped to 6800, the gear still yield an improvement.

Most importantly, they're more fun. Especially when you already have a 32" tire.

Totally depends on the goal. Those 2WD RCSB with 3.15 rears seem to be the fastest at the top end ungoverned. They consistently outperform the 3.31 and 3.73 in the top end even in 2WD vs 2WD trucks. For boosted application or extremely high MPH speeds you want taller gears. Those 3.15 gears start pulling on the lower gears like a 3.73 hard once you get up there in the Speedo on the Mustang. 3.73 is a good drag strip gear but will be demolished by a 3.15 in roll racing. There is no free lunch when it comes to gearing. Neither is magically better, both will have shortfalls.

 

[Chili]

Totally depends on the goal. Those 2WD RCSB with 3.15 rears seem to be the fastest at the top end ungoverned. They consistently outperform the 3.31 and 3.73 in the top end even in 2WD vs 2WD trucks. For boosted application or extremely high MPH speeds you want taller gears. Those 3.15 gears start pulling on the lower gears like a 3.73 hard once you get up there in the Speedo on the Mustang. 3.73 is a good drag strip gear but will be demolished by a 3.15 in roll racing. There is no free lunch when it comes to gearing. Neither is magically better, both will have shortfalls.

Due to the tire size difference a f150 with 32" tires and 3.73 gears will be like a Mustang with 3.2 gears. 3.31 gears in a f150 would be around 2.86 or so in a Mustang.

There is a point of diminishing returns, but due to large truck tires indont think 3.73 is there, not with the 5.0 at least.

But boost does love to load against a taller gear. More gear tends to favor NA, within limits.

 

[ZX250]

Checked the oil out of curiosity since it does have a shorter life cycle on e85. Checked it at full temp. The oil was warm to the touch. Not scalding hot like usual. Wonder if thats why the manuel says run regular gas at each oil change.

 

[tidefan1967]

Checked the oil out of curiosity since it does have a shorter life cycle on e85. Checked it at full temp. The oil was warm to the touch. Not scalding hot like usual. Wonder if thats why the manuel says run regular gas at each oil change.

How many miles on it? Did it have a stronger fuel smell than normal?

 

[jridout325]

Checked the oil out of curiosity since it does have a shorter life cycle on e85. Checked it at full temp. The oil was warm to the touch. Not scalding hot like usual. Wonder if thats why the manuel says run regular gas at each oil change.

On E85 you should be changing your oil earlier than normal. E85 is very hard on oil because it introduces more moisture and fuel into the oil and breaks it down faster. Especially if you do a lot of short trips. I run exclusively E85 and I don't go more than 4k on an oil change. I have noticed the oil monitor on the truck even recognizes E85 and it gives a shorter oil change interval (usually 3,500-4,000 miles)

 

[Samson16]

On E85 you should be changing your oil earlier than normal. E85 is very hard on oil because it introduces more moisture and fuel into the oil and breaks it down faster. Especially if you do a lot of short trips. I run exclusively E85 and I don't go more than 4k on an oil change. I have noticed the oil monitor on the truck even recognizes E85 and it gives a shorter oil change interval (usually 3,500-4,000 miles)

If I had a 5.0 RCSB running E85 my trips would be very short indeed. About 1/4 mile each ?

 

[ZX250]

Just passed 100k on the dad truck. Oz tune en route.

Ima run the coondawg s$it out of it after I get my tranny fluid changed Monday.

 

[Henfield]

The truck actively monitors Ethanol content and you can see your percentage anytime with a Scangage if you invest in one of those. Probably with other tools as well

 

[robry]

The truck actively monitors Ethanol content and you can see your percentage anytime with a Scangage if you invest in one of those. Probably with other tools as well

it doesn't, there is just logic in the PCM strategy that uses the oxygen sensors to add or remove fuel. That ethanol number is inferred and if you have any type of air leak behind the throttle body to the oxygen sensor it can be wrong. It's pretty okay on N/A stuff but that's why anyone tuning a boosted application will not offer a "flex-fuel" tune like a factory strategy or NA aftermarket tune. Ford does not use an ethanol or "gas" sensor on 5.0s like GM has done.

 

[djw.pro]

it doesn't, there is just logic in the PCM strategy that uses the oxygen sensors to add or remove fuel. That ethanol number is inferred and if you have any type of air leak behind the throttle body to the oxygen sensor it can be wrong. It's pretty okay on N/A stuff but that's why anyone tuning a boosted application will not offer a "flex-fuel" tune like a factory strategy or NA aftermarket tune. Ford does not use an ethanol or "gas" sensor on 5.0s like GM has done.

Actually there are a few tuners offering N/A flex fuel tunes on e85, but it’s unnecessary if a good tuner know show to adjust the logic. OZ offers 1 tune for all fuel with max timing being about 34 degrees under WOT. Stock, max timing is around 28. I can achieve these numbers around e35, depending on the quality of the ethanol. Too much octane you actually start loosing power. OX has shown you can run e30 safely on boosted applications with the stock fueling system. Anything more needs a upgraded HPFP.

 

[ZX250]

Anybody else have knocking issues after installing the Omega tune? The email I got said give it 7-10 days before reaching out and knock is normal. Motor sounds like a Triton under load.

 

[FI300]

None, what octane are you running? I only run 93 and E85.

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