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Old 01-13-2014, 09:05 AM   #11
Theblueoval
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I have a K&N CAI intake and always run 87 octane and I've never experienced any issues. Could contaminate have fallen into the intake manifold when you installed the new intake?
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Old 01-13-2014, 09:37 AM   #12
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I have a K&N CAI intake and always run 87 octane and I've never experienced any issues. Could contaminate have fallen into the intake manifold when you installed the new intake?
Why would you waste money to get a K&N CAI and then only run 87 octane? If you want performance, which it seems like you do than you need to run better gas as well. I can never understand this.. It is a fact that our cars run a lot better with 91+ octane.

EDIT: Sorry having a bad day at work...

Oh and OP return the car to stock and then take it back to the dealer. Get the issue fixed and reinstall the intake system.
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Old 01-13-2014, 10:06 AM   #13
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I'd like to but with a broke college student budget can't really shell out the extra for premium. I mainly did intake for the deeper engine tone and because its supposedly more efficient.
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Old 01-13-2014, 10:20 AM   #14
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When people say it's a "fact" that the 3rd gen runs better on 91 I do agree but are there actual tests or numbers that show this and not somebody's butt-o-meter. Any dyno numbers showing the diff between octanes or even acceleration tests? I've seen similar tests on turbo cars where the diffs are quite dramatic but with an NA engine the diffs might not be so transparent.
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Old 01-13-2014, 10:37 AM   #15
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When people say it's a "fact" that the 3rd gen runs better on 91 I do agree but are there actual tests or numbers that show this and not somebody's butt-o-meter. Any dyno numbers showing the diff between octanes or even acceleration tests? I've seen similar tests on turbo cars where the diffs are quite dramatic but with an NA engine the diffs might not be so transparent.
The best I got is 7.4 0-60 with my car on 91+ with only 400 miles on the car. Did anyone test 0-60 with 87-89? I am pretty sure my car has more in it now since it feels like it has more power now at 1500 miles. Will have to test this in few months once it warms up a bit outside.

Also I believe I saw couple dynos where someone got 14x fwhp with 89 and someone was in high 150's with 91+. Not sure if it was on this forum or a different one tho. Not gonna look for it now!
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Old 01-13-2014, 11:52 AM   #16
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I'm at 35k. Wow the plugs were already bad? They tell me they last 100k miles between service.. I did have my 30k service done but u don't think cleaning the spark plugs was in that..

Also, since I have filed my tank a good few times while this is happening, from different stations, would it still be possible that it's bad gas?
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Old 01-13-2014, 12:01 PM   #17
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We did the intake swap in a garage and made sure nothing was near the intake.. 5 minute job.
I personally gave up 87 just because my engine in the summer would make a loud knock and the 91 octane shut it up a bit.

As far as performance, the 91 has more of the feel.. but I gave it a go just from reading the ford focus owners manual.. "increasing octane will provide better performance"..
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Old 01-13-2014, 12:04 PM   #18
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So I'll throw all stock on and give it a go.. But my worry is thst if the stock air flow works normally, does that mean my car cannot handle an intake and exhaust? The people at the dealership insist that these cars are not capable of adjusting the amount of air that the engine takes, or even increase the fuel to compensate.. I've just never heard of an engine running lean from a cotton air filter and a hole in the top of the airbox..
People do this with old Escort GT's and don't have any problems!
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Old 01-13-2014, 12:43 PM   #19
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So I'll throw all stock on and give it a go.. But my worry is thst if the stock air flow works normally, does that mean my car cannot handle an intake and exhaust? The people at the dealership insist that these cars are not capable of adjusting the amount of air that the engine takes, or even increase the fuel to compensate.. I've just never heard of an engine running lean from a cotton air filter and a hole in the top of the airbox..
People do this with old Escort GT's and don't have any problems!
Plenty of people have intake/exhaust on this forum and no issues. Something else is wrong. Put it back to stock and take it in, I am sure you will keep having the same issue. If not, then make sure you got the intake system installed correctly. These cars have cumputers that adapt to more/less air, etc. They are BS u.
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Old 01-13-2014, 07:28 PM   #20
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Truthfully you should run premium in the mk3 focus because it is a high compression engine running a 12:1 compression ratio. ford recommends you use 87 because they tuned the engine with the vvt (variable Valve timing) to adjust and run it. the lower octane fuel is defiantly causing the pinging noise. a lot of people will deny this but facts are facts. our cars are eco tuned to run 87 octane and is only saved cause the vvt won't let the engine run bad on it. i work on Mercedes all day and we get this issue with our car's all the time because it's a high compression engine with customers putting low octane fuel causing a pinging noise or knocking noise. we do have direct injection engines also for anyone trying to compare.

http://auto.howstuffworks.com/fuel-e...question90.htm

nice little bit right there
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