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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Fuel Optimization / Induction Service
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      07-20-2019, 03:37 PM   #23
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It may be a placebo effect, but the idle is smoother, acceleration seems smoother and all-in-all, it wasn't a particularly expensive service. I am also glad I replaced the thermostat and did the coolant flush. With these record temps, I want to ensure the cooling system functions as it should. I suppose I should feel lucky my thermostat gave me 148,000 km, they appear to be a common replacement item on the F3x.
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      07-20-2019, 04:43 PM   #24
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Quote:
Originally Posted by IK6SPEED View Post
That would give you E25 at 93.8 Octane
So is it worth the effort of having to go to 2 separate pumps or should I just stick to 91?
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      07-20-2019, 04:50 PM   #25
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Quote:
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Originally Posted by IK6SPEED View Post
That would give you E25 at 93.8 Octane
So is it worth the effort of having to go to 2 separate pumps or should I just stick to 91?
If you do not have access to 93, it's depends on your objectives.

But that's a different topic than Fuel Optimization/Induction Service.
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      07-24-2019, 09:38 PM   #26
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The issue is you only get what liquid catches on the carbon on the way by. If you could soak the crap out of it, then it would break loose.

Great video BTW....
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      07-25-2019, 01:25 AM   #27
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Quote:
Originally Posted by F30ZHP View Post
So is it worth the effort of having to go to 2 separate pumps or should I just stick to 91?
My area is 93. Itís rare to find a gas station with 91.

A few stations in my area have E85 at the same pumps so if I wanted tontry an E25 mix, itís the same pump but two swipes of the card.
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      07-25-2019, 06:01 AM   #28
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Quote:
Originally Posted by IK6SPEED View Post
Running pure E85 will also take care of carbon deposits.
i've never heard this before. the main benefit is similar to running meth. It's not the fuel that preventing carbon. It's adding additional injection in the charge pipe or intake manifold that sprays fuel over the valves to keep them clean.

carbon deposits are primarily dependent on oil and piston ring tolerances. fuel has little effect.
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      07-25-2019, 07:12 AM   #29
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Originally Posted by Wires View Post
If you could soak the crap out of it, then it would break loose.
To some extent that's what happens. If you sprayed the cleaner into the intake manifold with the engine off it wouldn't be evenly distributed on the valves and manifold surfaces. That's why it's sprayed into the manifold with the engine running. Doing that most of the cleaner gets sucked into the cylinders, that's why the entire can of cleaner is used, rather than just a spritz or two like when you're cleaning the MAF sensor. Not a lot of cleaner ends up coating the valves and manifold, but it's so highly concentrated that it doesn't take a lot. The hour waiting period allows the cleaner to do its job, the highway drive right after that purges the cleaner and the deposits that it removed.
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      07-25-2019, 11:36 AM   #30
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Quote:
Originally Posted by kern417 View Post
Quote:
Originally Posted by IK6SPEED View Post
Running pure E85 will also take care of carbon deposits.
i've never heard this before. the main benefit is similar to running meth. It's not the fuel that preventing carbon. It's adding additional injection in the charge pipe or intake manifold that sprays fuel over the valves to keep them clean.

carbon deposits are primarily dependent on oil and piston ring tolerances. fuel has little effect.
Using Meth and 100% E85 are 2 totally different things.
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      07-25-2019, 11:47 AM   #31
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Quote:
Originally Posted by IK6SPEED View Post
Using Meth and 100% E85 are 2 totally different things.
Agreed, just saying that the benefit of no carbon deposits with both systems is typically due to requiring additional injection points before to the intake valves. The fuel itself in either case doesn't prevent carbon build up. How could it?
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      07-25-2019, 11:49 AM   #32
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Quote:
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Quote:
Originally Posted by IK6SPEED View Post
Using Meth and 100% E85 are 2 totally different things.
Agreed, just saying that the benefit of no carbon deposits with both systems is typically due to requiring additional injection points before to the intake valves. The fuel itself in either case doesn't prevent carbon build up. How could it?
Because E85 isn't carbon based like gasoline. It's Alcohol.
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      07-25-2019, 01:38 PM   #33
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Quote:
Originally Posted by IK6SPEED View Post
Because E85 isn't carbon based like gasoline. It's Alcohol.
Gotcha. I guess i'm thinking more of the oil deposits and blowby still having an effect.
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      07-25-2019, 01:56 PM   #34
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Quote:
Originally Posted by kern417 View Post
Quote:
Originally Posted by IK6SPEED View Post
Because E85 isn't carbon based like gasoline. It's Alcohol.
Gotcha. I guess i'm thinking more of the oil deposits and blowby still having an effect.
I'm no scientist but that's the best explanation I can give you.
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      07-25-2019, 04:41 PM   #35
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Quote:
Originally Posted by kern417 View Post
The fuel itself in either case doesn't prevent carbon build up. How could it?
It can't. The source of carbon build up on the intake valves and manifold isn't the fuel, it's the oil in the crankcase.
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