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      08-07-2013, 09:50 AM   #23
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Quote:
Originally Posted by Lute View Post
Of course, it is the future, you can get more power with the same or better gas mileage, the issue is how do you address valve maintanance going forward. Thankfully the s65 is port injected so these are issues I don't have to stress for now
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That and the other car I want, a 997 Turbo. No DI for me yet
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      08-07-2013, 12:55 PM   #24
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Quote:
Originally Posted by Lute View Post
It's really quite simple. Standard engines use port injection which sprays fuel "over" the intake valves where the gasoline additives such will help keep injectors and valves clean.

Direct injection sprays fuel "under" the intake valves directly into the combustion chamber. Fuel additives and cleaners will do nothing to clean valves in this case only the injectors. The only way to clean valves on a direct injection engine is to remove the head and manually clean the valves.

To answer why they use direct injection, main reason is better metering of the fuel air mixture which improves fuel efficiency and MPG.

Attachment 897040
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      08-07-2013, 01:06 PM   #25
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Quote:
Originally Posted by Lute View Post
Of course, it is the future, you can get more power with the same or better gas mileage, the issue is how do you address valve maintanance going forward. Thankfully the s65 is port injected so these are issues I don't have to stress for now
It is mostly addressed in the new cars now. Toyota, Honda, Nissan, Mazda etc. all are using DI in their engines now. Given their reputation for reliable cars, they have to have figured this out otherwise there would be a ton of complaints given the amount of Hondas and Toyotas that are on the road.
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      08-07-2013, 05:16 PM   #26
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http://www.audizine.com/forum/showth...-up-Megathread

Given the stable of brands under VW AG, I'd be curious to see how DI is treating some of their other cars after a couple years of service.
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      08-07-2013, 07:25 PM   #27
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Although Seafoam is used in fuel, it's also used in the crankcase. I think that might have been what the OP was talking about. I've used it a long time in my cars (mainly older cars with more miles) and it's great stuff. Just my opinion though that I'll stick with the recommended oil, change every other interval myself (let BMW pick up the other), and buy the best fuel I can get locally. I'm going to leave the additives out of mine.
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      08-08-2013, 09:31 AM   #28
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I've used Seafoam in the past. I was happy with it. The OP is on the east coast and probably runs Shell or Sunoco fuel. I don't believe either of these fuels have Techron in their additive packages. Techron would be a good choice as someone else recommended. I alternate between that and Redline Fuel Injector cleaner. I also alternate between Shell and Sunoco to take advantage of their differing detergent formulations.
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      10-16-2016, 02:01 PM   #29
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Hi all,

I've used seafoam in other cars and it actually improved idle harshness right away and in one car the throttle response was improved. These were port injected engines (not DI). I have a friend with an E90 335i and, because of DI, he actually started to have hesitation after 60k miles - I suspect it's more of an issue on those cars.

Anyway, back to me... I have a 2010 M3 and tried the throttle bottle method that I used with other cars. I removed the air intake boot enough to insert the air tube from the seafoam spray bottle and gave it a shot. Basically, there was no smoke or change. Since the M engine has 8 individual throttles, I wonder how much actually made it into the cylinders, based on the lack of smoke, I'd say 'not much'. I suppose I could remove the cover and spray each throttle individually, but this seems like a lot of work for possibly minimal reward.

Has anyone seafoam'ed through the air intake and/or a vacuum line? If so, can you share how you did and if you noticed any difference? Thanks.
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      10-16-2016, 06:30 PM   #30
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Quote:
Originally Posted by mikoz
Hi all,

I've used seafoam in other cars and it actually improved idle harshness right away and in one car the throttle response was improved. These were port injected engines (not DI). I have a friend with an E90 335i and, because of DI, he actually started to have hesitation after 60k miles - I suspect it's more of an issue on those cars.

Anyway, back to me... I have a 2010 M3 and tried the throttle bottle method that I used with other cars. I removed the air intake boot enough to insert the air tube from the seafoam spray bottle and gave it a shot. Basically, there was no smoke or change. Since the M engine has 8 individual throttles, I wonder how much actually made it into the cylinders, based on the lack of smoke, I'd say 'not much'. I suppose I could remove the cover and spray each throttle individually, but this seems like a lot of work for possibly minimal reward.

Has anyone seafoam'ed through the air intake and/or a vacuum line? If so, can you share how you did and if you noticed any difference? Thanks.
How long did you let the car sit before you fired it back up? If I remember correctly, you are supposed to make the engine stall out by spraying enough sea foam to make it stall. Then let it sit for 20-30 minutes before firing the engine back up and there should be plenty of smoke coming from the exhaust. If you don't let the car sit, it wouldn't smoke that much.

Also, a day before I did an oil change, I poured some in to the oil crankcase to clean it out.
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      10-17-2016, 01:48 AM   #31
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Quote:
Originally Posted by mikoz View Post
I suppose I could remove the cover and spray each throttle individually, but this seems like a lot of work for possibly minimal reward.

You would be correct. Unless the car was horribly maintained, I don't see any reason for these atomic bomb-style treatments (see also: Kreen, AutoRX). They are truly designed a last resort. M3s are getting good oil and premium gas their whole lives -- they aren't beaters with a pound of sludge.
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      10-17-2016, 08:51 AM   #32
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From what I recall, you pour (not spray) 1/2 bottle in your brake booster vacuum line, 1/2 bottle into the crankcase, and a full bottle into your fuel tank.

I know its not a BMW but back when I had a Prelude, the first time I did this method the car smoked out the neighborhood, but the car ran 10x better and got 17% better gas mileage (I did the math).

Be sure and change the oil shortly after you pour it in the crank case. Also, the vacuum method, pour it slowly, dont allow it to die. Then when half the bottle is gone, shut the car off for 10 mins then go on a very spirited drive.
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      10-17-2016, 09:01 AM   #33
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Quote:
Originally Posted by vastano View Post
From what I recall, you pour (not spray) 1/2 bottle in your brake booster vacuum line, 1/2 bottle into the crankcase, and a full bottle into your fuel tank.

I know its not a BMW but back when I had a Prelude, the first time I did this method the car smoked out the neighborhood, but the car ran 10x better and got 17% better gas mileage (I did the math).

Be sure and change the oil shortly after you pour it in the crank case. Also, the vacuum method, pour it slowly, dont allow it to die. Then when half the bottle is gone, shut the car off for 10 mins then go on a very spirited drive.
Pour or spray, either way. Seafoam comes in liquid and aerosol form. I found out easier to spray it down the brake booster vacuum line versus trying to pour it. Plus, I felt it spread better lol
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