09 Civic Si -- What mods increase gas mileage and performance?

[09si]

hey all, i am new to clubcivic, and would like some tips from the more experienced ones. i got this account right when i got my 2009 civic si coupe. it is completely stock apart from my royal purple oil change, which added a few horses and mpgs. but besides that, i would like to increase my power and gas mileage. i know there has been alot of controversy about if intakes increase gas mileage and such, but i would more than love some help from people who know from experience. if any of you could list some things that increase gas mileage and power, it would be greatly appretiated. thx in advance

 

[THEDARKONE]

welcom (:

 

[09si]

thanks! btw any suggestions at all?

 

[2slo4u]

My suggestion is to either look into a supercharger or a turbocharger. And oil will not give you horsepower.

 

[TheHatchGuy]

My suggestion is to either look into a supercharger or a turbocharger. And oil will not give you horsepower.

Only in gt5 it does lol

No fat chicks, car will scrape.

 

[09si]

well im not gunna say your wrong cuz i honestly cant notice a difference... but they have done dyno tests and apparently it does... but im well aware that it isnt a porsche just cuz i have expensive oil lol... do you have an intake? and if so does it increase your mileage?

 

[2slo4u]

can't believe everything you hear/see, you'll learn that in the car world.
example: TURBONATOR

i don't have a full intake because it won't do much for what you pay..maybe some noise but it won't really increase the mpg at all..although if you want to make sure that the air coming in in nicely filtered i'd suggest a k&n drop in filter, if you want looks, then a full intake

 

[will85w4]

I just have a drop in K&N in the wife's 09 Civic...let it breathe...engine is like a lung, the easier it can breathe, the less it has to work...

My 99 EX has a CAI on it, it's just loud and probably adds a tiny bit of HP at VTEC to WOT range on the tach

I would go with the K&N drop in, add a header, and get a nice exhaust system to open it up

Then again, she won't let me do anything else to it...yet

 

[emerican]

Personally i would go with a full intake, but thats just me then a good header and cat back exhaust system.
These are the basic things most people always start with when it comes to modding the car.
It will add next to nothing, but if you dont have to worry about emmisons look into a test pipe or high flow cat.

 

[SARSagent6]

Welcome aboard

 

[jeromess]

I'm new to CIVIC .and this forum too. have no experience in Modified.just come here for learn more

 

[Slow y Low]

Welcome! The more air going into and thru the motor, the better. Intake with a good filter, headers, cat back or custom exhaust, larger throttle body, thats where I would start. These mods would give your Honda a richer/deeper sound and might even give you better gas mileage. New tires inflated to the correct pressure also improves gas mileage. Try to stay away from BIG rims. Try to keep the car as empty as possible (less weight means less work for the car) Unless you're thinking of going turbo, I would wait on some of the upgrades I mentioned since turbos usually require crazy kits or parts to run efficiently. I don't think oil increases horse power but a quality oil such as royal purple allows the moving parts of the motor to glide effortlessly with minimal resistance (which in turn improves fuel economy) Also, now that you went synthetic... I would recommend keeping it that way. Have fun and take your time when modding.

 

[Avant Uprising]

well im not gunna say your wrong cuz i honestly cant notice a difference... but they have done dyno tests and apparently it does... but im well aware that it isnt a porsche just cuz i have expensive oil lol... do you have an intake? and if so does it increase your mileage?

for your k20 id say a skunk 2 intake manifold, intake, header and exhaust and a kpro or reflash. good oil will let the engine work better so your not gaining hp just prob restoring what you have lost.

 

[Slow y Low]

I forgot the mani. Great point.

 

[Shanesaw]

Aparently E3 spark plugs can add up to 5hp and better mpg whether its true or not i dont know but they are only $15 a pair so it's worth a shot

 

[Slow y Low]

NGK ALL THE WAY!! In my case anyways...And new plugs always increase gas mileage.

 

[emerican]

I only use NGK plugs and NGK blues for the wires.

 

[Slow y Low]

^whats the deal with all these bots everywhere???

 

[emerican]

now there is no bot so your pointing at me lol.

 

[Slow y Low]

Ha. I scared them off. What's the deal with that anyways?