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Honda Civic Coupe / Civic Si 2006+

1033 messages,  Last post on Sep 15, 2009 at 7:27 PM

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What is this discussion about? Honda Civic, Coupe, Hatchback

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#1003 of 1033 Re: Running the Si on regular gas instead of premuium [unkownuser] by shipo Dec 25, 2007 (9:54 am)
Replying to: unkownuser (Dec 25, 2007 8:14 am) I'll deal with the reduction in mileage first. Fact: Any engine that is designed to be able to take advantage of Premium fuel WILL get measurably worse mileage when the timing is retarded to allow it to safely burn Regular. Period, full stop, the end.   As for the issue of mechanical damage, no, I have no first hand experience of destroying an Si engine (or any other high compression engine that "Requires" Premium fuel for that matter), I simply will not subject my engines to that kind of abuse. That said, I've been turning wrenches for over thirty years and have seen the results of octane skimping any number of times, and it ain't pretty.   The fact is that as compression ratio rises, the heat generated from the compression will eventually reach a point where it is too high for any amount of timing retardation to prevent detonation (and engine damage as a result). Is it 10.5:1? How about 11.0:1? Maybe 11.5:1? I don't know for sure where the threshold is (it varies by engine, OAT, humidity, altitude, and a few other variables), however, I do know one thing for sure, the engineers at Honda don't just "Recommend" Premium fuel (which is the language usually reserved for cars that CAN retard the timing far enough to burn Regular), they "Require" it. Given that Honda engineers have a very good reputation with regards to the care and feeding of the engines they design, my bet is that if they say that Premium fuel is "Required", only a fool would tempt fate and run anything less than 91 AKI in their Si.   Best Regards, Shipo
#1004 of 1033 squeaks by hbicks4 Dec 26, 2007 (8:19 pm)
I recently bought a 08 si coupe and love it. The one thing that I noticed is that there Are some squeaks coming from the passenger dash and wondering if I should even bother taking it back to the dealer? Any thought or similar noises out there?
#1005 of 1033 Re: Intake Air temperature sensor [iorozco13] by aznxboy86 Dec 29, 2007 (4:53 pm)
Replying to: iorozco13 (Dec 06, 2006 8:15 pm) i have the same problem...where is this intake air temperature??
#1006 of 1033 Re: Running the Si on regular gas instead of premuium [coupe2] by drmbb Jan 02, 2008 (4:56 am)
Replying to: coupe2 (Dec 24, 2007 7:13 am) You don't have to reprogram anything. The knock sensor in the engine will retard ignition to accommodate the lower octane fuel automatically.   However, as shipo has posted, you cannot change the engines compression ratio (unless you plan on rebuilding it yourself), so you would be running your engine with continually retarded ignition. That is going to give you worse gas mileage and will increase your exhaust emissions (if you care about the air you breathe).   So, I too do not see the point. If you really want to run regular gas, you'd have been far better off buying a regular EX sedan instead of an Si.
#1007 of 1033 Re: Running the Si on regular gas instead of premuium [coupe2] by tayl0rd Jan 03, 2008 (11:01 am)
Replying to: coupe2 (Dec 24, 2007 7:13 am) As was already said, you'll have horrible gas mileage. I have first hand experience with that one. Not in an Si, but another car where premium was only "recommended." I would get a solid 50 miles LESS per tank of gas, and the car ran and felt very anemic. With an 11:1 compression ratio, I'm sure your owners manual states that you should only run regular gas in an emergency situation with just a few gallons of it in the tank and to fill up with premium as soon as possible.   Sure you can run regular in it, but I wouldn't dare trying to run that engine up to 8K RPM with it!! That would be begging for busted pistons and/or bent rods. And there's no way it'd pass an emissions test.
#1008 of 1033 1998 honda cvic help plaese by euroblue Jan 11, 2008 (12:46 pm)
ok i have a big problem this honda civic and i dont want to junk it . this is what happened normal drivening for a few miles like 5000 after i got it and the #4 pistons blent on me so i got a head from a junk yard the car was running`good the parts car . so i went home got a new head gasket checked to make sure the head wasn't bent and the block they checked out so i put the head on just like to service manully expained in detail changed the old and antifreez also new plug and wires . ok so to make it somewhat shorter it run but only 1&4 r working so it doesn't run right anyone got any ideas to help me out on this one ?????? Replies to this message: ramza (Apr 07, 2008 6:19 pm)
#1009 of 1033 Re: 1998 honda cvic help plaese [euroblue] by ramza Apr 07, 2008 (6:19 pm)
Replying to: euroblue (Jan 11, 2008 12:46 pm) ok this may or may not help you but if you message me and give me some more info on the car and what is doing when you start it i may be able to help you some. it could be a timing problem or sparkplugs weren't put in correctly. most likely its your distrubuter is off or cyl 2 and 3 spark plugs are not plugged in correctly. hopefully this may help you i would check all of your connections and COMPLEATLY switch the plugs to see if its just faulty cables. also check the head you pulled and make sure there is no damage to the intake valves that may cause a major problem even if its a chip the size of a large grain of sand.well message me back and ill try to help you my email is terencenayloryahoo.com i am not a pro but im good with cars. if i cant help you ill get u info from one of my friends.
#1010 of 1033 Thinking about an '08 Si by rock_strongo Jun 19, 2008 (3:20 am)
Hey all, I was wondering what typical MPG you Si folks are seeing? I am coming from a Subaru Forester XT, and I'm probably in the low to mid-20's MPG. I know both cars take premium fuel, but if the Si gets better gas mileage I would consider switching over. My commute (95%) is mostly highway. Any advice/help would be appreciated. Replies to this message: cz75 (Jun 19, 2008 12:20 pm) motonation (Jun 20, 2008 5:26 am) rock_strongo (Jun 20, 2008 5:31 am)
#1011 of 1033 Re: Thinking about an '08 Si [rock_strongo] by cz75 Jun 19, 2008 (12:20 pm)
Replying to: rock_strongo (Jun 19, 2008 3:20 am) I average 26-27 mpg, which is mostly suburban and rural secondary roads.
#1012 of 1033 Re: Thinking about an '08 Si [rock_strongo] by motonation Jun 20, 2008 (5:26 am)
Replying to: rock_strongo (Jun 19, 2008 3:20 am) There's a whole thread on Civic mileage - check it out: http://townhall-talk.edmunds.com/WebX/.ef7f897/1649   There's also info at 8thcivic.com about it.   Most people seem to average in the mid to high twenties overall, but many people have reported hwy mileage in the 33-34 range. I'm thinking of purchasing one myself, and have a friend with an 07 Si sedan that gets that on the highway, so it can be done; maybe even a bit more if you have everything working in your favor. Replies to this message: rock_strongo (Jun 20, 2008 5:31 am)

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