don't use premium gas
06-11-2005
#181
I just burnt my tongue
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i dunno if this has been said before cuz im too lazy to read all 12 pages...but...the reason that u shouldnt use premium gas is cuz the higher the octane the harder it is to burn the fuel...in high compression engines it requires premium because 87 octane will usually cause pre-ignition and detonation without the spark plug setting the air fuel mixture off...thats why we go to higher octane fuels because it is that much harder to burn so at high temps of the high compression engine it will not pre-ignite or detonate without the spark plug setting it off...the lower compression engines should use 87 because there is not as much heat produced during the compression cycle so premium is harder to burn even with a spark and because of that excess hydrocarbons are left...only when boosted should one use premium because ur increasing the compression a hell of a lot
06-12-2005
#182
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Originally Posted by Jrfish007
Huh? what is the Acura EL, as far as I know no Acura uses a civic EX engine, infact the civics are the only SOHC engine Honda makes to my limited knowledge.
exactly, this is my question.
It has EX engine but the manuel suggest the car uses primuim. Why would Honda suggest something which woud really going to hurt the reliability.
Is it true that whatever gas you use won't really affect the D17 SOHC in Honda engineer's point of view? therefore they can suggest primium on EL purely for marketing reason?
06-12-2005
#184
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you guys the bottom line is this: unless you have a hi compression motor (most found on sportscars and other HI performance vehicles), just use regular 87. The acura rsx type-s actually calls for 89 because of this. If you turbo the car, octane also has to go up to prevent knocking. Using higher octane on a measly civic will cause more carbon to build up, and in time will cause hp loss.
06-13-2005
#186
My SL65 rim, because a rim is all I can afford
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Originally Posted by orion_squall
exactly, this is my question.
It has EX engine but the manuel suggest the car uses primuim. Why would Honda suggest something which woud really going to hurt the reliability.
Is it true that whatever gas you use won't really affect the D17 SOHC in Honda engineer's point of view? therefore they can suggest primium on EL purely for marketing reason?
It has EX engine but the manuel suggest the car uses primuim. Why would Honda suggest something which woud really going to hurt the reliability.
Is it true that whatever gas you use won't really affect the D17 SOHC in Honda engineer's point of view? therefore they can suggest primium on EL purely for marketing reason?
http://www.acura.ca/AcuraEng/Models/...s?ModelName=EL
If you scroll down about 1/3 of the way it says to use regular unleaded, aka 87 octane. If indeed the manual really says to use premium and I owned this car, I would call up Acura and ask wtf? But I'm guessing ti was a typo in the manual.
06-13-2005
#187
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Originally Posted by gearbox
you guys the bottom line is this: unless you have a hi compression motor (most found on sportscars and other HI performance vehicles), just use regular 87. The acura rsx type-s actually calls for 89 because of this. If you turbo the car, octane also has to go up to prevent knocking. Using higher octane on a measly civic will cause more carbon to build up, and in time will cause hp loss.
Exactly, although you may want to add anouther reason to use higher octane is for high revving engines.
But the most important reason for not using it is cost, at least for me, why spend more money on something than you need to? And when I first got my civic, I used 93 octane, then after a few months I switched over and to 87 and found I got about 3-4 MPG better milage.
06-13-2005
#188
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Rep Power: 787 i got around 42 mpg with 89 so I guess I'll stick with that due to slightly higher compression. 93 just ran horribly, I think cause its such a big jump.
06-13-2005
#189
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Rep Power: 311 ok the acura el or whatever the crap it is is the same as an ex civic. d172a. the manual says 86. i tried premium and my car got the crappiest mileage. with regular its 40mpg. 86. try it out. if it knocks, which it shouldn't then go back to premium
06-13-2005
#190
OMNES AD UNUM
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Rep Power: 309 not sure if i mentioned in this thread but i tested 76's gasoline 87 vs 91 on the automatic civic (intake/catless).
idk if it was my mind, but the 91 "felt" smoother and ran more fine than the 87. but then i notice a drop of gas mileage using 91. 87 yielded in better gas mileage overall.
til this day, i have been filling up with 87 and 89 once every other week.
idk if it was my mind, but the 91 "felt" smoother and ran more fine than the 87. but then i notice a drop of gas mileage using 91. 87 yielded in better gas mileage overall.
til this day, i have been filling up with 87 and 89 once every other week.
11-24-2006
#192
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Rep Power: 233 Today I went to a full service Shell and the attendant filled up my Civic with premium (I asked for regular & really wasn't paying attention to the pump). I do not fill up with premium, only regular but I noticed after I drove off and looked at the receipt and saw the attendant actually filled up with PREM 
. It was 6.4 gallons of premium. This is this first time premium was put in the tank. Will this 6.4 gallon fill up with premium cause any damage?
. It was 6.4 gallons of premium. This is this first time premium was put in the tank. Will this 6.4 gallon fill up with premium cause any damage? 
11-24-2006
#195
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Rep Power: 278 Wow! Old thread.
Well, I'm putting this to rest using a scangauge. We'll see how different octane affects mileage.
Well, I'm putting this to rest using a scangauge. We'll see how different octane affects mileage.
11-24-2006
#197
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Rep Power: 0 i use premium gas for my Ex and it's fine. though, i'm not feeling any difference in HP. not that i was looking for anykind of difference. i've been using premium gas for more than a year now and my car is fine.
11-24-2006
#198
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Rep Power: 787 long term effects, injector failure and extra carbon buildup in the engine. its your car. read the manual and use regular 87. you dont have a hi compression motor, therefore you do not need premium. all it does is make the car work harder and not burn all the gas.
11-24-2006
#199
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Rep Power: 275 Why spend money to get absolutely NO benefit? It’s pretty much like throwing it out of your window. If you need to spend the money you can PayPal me a couple bucks every fill up. 
Save the premium for cars that are designed to run on it and need it...
Save the premium for cars that are designed to run on it and need it...
11-24-2006
#200
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Rep Power: 0 well, wouldn't it be too late now for me to stop?. it's been like a year and a half or so that i've been having constant 93 premium gas in my car. is my car going to take a dump on me as soon as i put the 87 regular gas back in it after the premium's been running in it for so long? i mean, how long does one have to keep using or putting premium gas into their car before it ***** on them?
11-25-2006
#203
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Rep Power: 275 just start using reg and save your money. You have probably done no harm and it wont hurt to switch.
11-25-2006
#205
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Rep Power: 787 switch back to 87, it will be fine. i doubt you will notice any change, and the ecu would have adjusted its timing after one tank.
11-25-2006
#206
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Rep Power: 0 yeah, sometimes i DO infact think to myself. "am i just wasting my money" or "am i doing no good for my engine with this gas"? I think i SHOULD switch back to regular. i'll have to wait though cause i recently filled up on 93 so i have to wait for like a month unless i drive alot more than usual.
11-25-2006
#207
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Rep Power: 277 91 get's better mileage for me then 94 but I'm sure I've got more power with the 94.
Edit: BTW if you tuned your car to premium (without any mods except for a tunable ECU) then would the higher octane cause damage?
Edit: BTW if you tuned your car to premium (without any mods except for a tunable ECU) then would the higher octane cause damage?
Last edited by kornsined; 11-25-2006 at 12:50 AM.
