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DURATEC Ti-VCT Performance (2012-Current) The place to chat about any Duratec 2.0L Ti-VCT engine performance, tuning and exhaust related upgrades.

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Old 05-21-2012, 11:34 PM   #241
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We have ethanol laced, dirty dishwater douche around here for fuel. No matter what I fill with, it all smells like an inebriated wino just took a piss in my gas tank.
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Old 05-21-2012, 11:54 PM   #242
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Quote:
Originally Posted by r1derbike View Post
We have ethanol laced, dirty dishwater douche around here for fuel. No matter what I fill with, it all smells like an inebriated wino just took a piss in my gas tank.
It can't be as bad as California reformulated gasoline.
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Old 05-22-2012, 07:56 AM   #243
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Last week, before I started reading this thread, I needed to put in a bit of fuel ($20.00 cdn) to complete a trip, otherwise, I'd be waving at everyone from the side of the highway. The gas station I stopped at had the regular and the premium at the same price, for reasons unknown. So, I put in $20.00 of premium to see what would happen. I reset my average gas mileage indicator and away I went to complete my trip. It was all highway, mostly a gradual uphill trip. I set the cruise control to 100 km/h and had the A/C on.While at highway speeds, I was getting 40.4 mpg, the best yet. I ended up with an average, after doing some "city" driving as well, of 37 mpg. So, this whole premium/regular discussion in of great interest to me. I intend to try a couple of tanks of premium in the car for my next few fill ups.
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Old 05-22-2012, 10:18 AM   #244
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I have found that the fuel mileage continues to get better through the third tank after a system reset. I just put in my fourth tank and got 35mpg, with the 18"tires and running the defroster. The best I ever got in my SEL (17" rims) without defrost was just over 31 mpg.

I will be getting reset again later this week after they apply the latest TSB and will be sent back to the land of less fuel mileage. Oh well, it's worth it if the car drives even better.
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Old 05-22-2012, 01:10 PM   #245
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Quote:
Originally Posted by DAC17 View Post
This is really a great thread. Everyone has an opinion, no one has real facts.
Here is a 8,500+ mile hot weather Premium vs Regular MPG test done by Edmunds with a Chevy Cruze Turbo.

Although GM states their small displacement turbo engines are especially octane sensitive, this test proves modern engines can indeed benefit from higher octane.

Granted, our (non ST) engines aren't turbo, but with 12:1 compression and relatively small displacement for 3k weight, a high level of compensation is required here too.


Anyway, bottom line... over 10% improvement on Premium gas.

http://blogs.insideline.com/roadtest...mium.html#more
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Old 05-22-2012, 01:23 PM   #246
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Quote:
Originally Posted by SpinKix View Post
Here is a 9,500 mile hot weather Premium vs Regular MPG test done by Edmunds with a Chevy Cruze Turbo.

Although GM states their small displacement turbo engines are especially octane sensitive, this test proves modern engines can indeed benefit from higher octane.

Granted, our (non ST) engines aren't turbo, but with 12:1 compression and relatively small displacement for 3k weight, a high level of compensation is required here too.


Anyway, their tests bottom line... over 10% improvement on Premium gas.

http://blogs.insideline.com/roadtest...mium.html#more

Interesting test -- I think I'll try to do some similar testing when I get my 2012 Ti HB. I think I'll also look into getting the tester to check for ethanol content as that's another knob that can effect things like mpg. It could be the 10% benefit seen with 91 octane over 87 octane was as much to do with lower ethanol than the adjustments the car makes based on octane alone. Although assuming the 87 octane had 10% ethanol and the 91 was 0% the energy content would only differ by about 3.3% -- no where near 10%.


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Old 05-22-2012, 03:35 PM   #247
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Quote:
Originally Posted by Kabigon View Post
Can you post some links to support your claim?

Here is one that refutes it:

http://www.autoobserver.com/2011/06/...-adopters.html

“DI engines are prone to forming oily deposits on the intake valves, unlike in port fuel-injected engines, where a constant spray of fuel into the port allows any deposits to wash away. With DI engines, the fuel gets injected directly into the combustion chamber, so there isn't a chance for the deposits to wash away. Typically, deposits form when soot – which is an end-product of combustion – adheres to the valve stem.”
You didn't read this all the way, did you?
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Old 05-22-2012, 03:47 PM   #248
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Originally Posted by dyn085 View Post
You didn't read this all the way, did you?
I've read that article in the past, and I just read it again. There is nothing in that article that supports gtp2focus's claim that fuel detergent additives "keep carbon deposits away from your valves" in DI engines.

Granted, it does state that some engine manufacturers have found ways to reduce or eliminate valve deposits, but none of the methods mentioned relates to the cleaning of valves from fuel additives.

The methods mentioned are:

improved components such as high-pressure solenoid injectors
injection-timing calibration
optimization strategy with valve events
redesign of EGR systems to reduce particulates
redesign of PCV systems to reduce particulates
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Old 05-22-2012, 04:34 PM   #249
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Just poking fun at the fact that the article quotes Ford at the reduction and uses the Ecoboost and 2.0 as examples/info. No harm meant.
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Old 05-22-2012, 04:38 PM   #250
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It is interesting that it mentions our 2.0 Duratec DI. I find this part of the article particularly interesting:

Quote:
Stephen Russ, technical leader for combustion for Ford’s 2-liter Duratec DI engine, said that similar to GM, engineers have determined the proper injection-timing calibration to help eliminate the carbon deposits. But Russ also said the technology of injection components – particularly the high-pressure solenoid injectors – has quickly matured, meaning excess valve deposits in most DI engines should become a thing of the past as these improved components are incorporated into production.
That highlighted part makes Stephen Russ sound like he's not quite sure, doesn't it?
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