A little more hp for R18 - Page 11
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Thread: A little more hp for R18

  1. #101
    Nooblets Ridingaround's Avatar
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    Why are people apparently very serious about getting significant horsepower gains from an R18? An R18 will outrun many v8 engined american made cars and trucks because they have either fuel or electronics shut offs before the r18 tops out. An r18 is the best economy car engine ever made. Why screw it up?
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  3. #102
    Truck? What truck?! scottyrocks's Avatar
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    Quote Originally Posted by Ridingaround View Post
    Why are people apparently very serious about getting significant horsepower gains from an R18? An R18 will outrun many v8 engined american made cars and trucks because they have either fuel or electronics shut offs before the r18 tops out. An r18 is the best economy car engine ever made. Why screw it up?
    The R18 will not outrun most anything if the other driver puts their foot into it.

    My wife's '18 Accord LX has the base 1.5 liter turbo and the CVT, and is a swift bastid. Acceleration is quite brisk - way better than my R18 with a 5MT.

    The 10th gen Civic is available with the same drivetrain as the Accord. In a lighter car, it's got to be even more impressive.
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  4. #103
    Platinum Member fear24's Avatar
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    i think he may have been being sarcastic in his remarks. just an observation/perception i took from it. however, i could be wrong, yet again!!!
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  6. #104
    Nooblets RRCoupe's Avatar
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    The way I look at it the K24 is in no way superior to an R18. The gear box can only handle about 300 wheel torque. The engine is pretty much a high compression economy motor with variants making as little as 160hp.

    2012 Si coupe is 2,887lbs
    2012 EX coupe is 2,680lbs

    IMO my R18 at 12psi with a 50 trim turbo weighing in under 2,600lbs after weight reduction, is pretty damn quick I've beaten many 335i's, Si's of all trims with/without mods, Challengers, WRX's, V6 accords, Range rovers, you name it whatever car is considered "Sporty" the performance is pretty much on par. It's also way more entertaining when you pull up to a stop light after, and they just stare at you demanding what type of got dang engine that thang got.

    K24 you have to build it
    R18 you have to build it

    Just a turbo kit with supporting mods for an Si you're in over 7k without a tune. My custom kit with tuning, supporting mods, and some custom one off fabricated parts that no one else in the world has came in at $5,200.

    If anyone is looking into a turbo R18 Greddy teamed up with RevHard and made a bolt on kit for 9th gen R18's. It still says TBA but I've seen come up for sale for around $4,200 for the complete kit.

  7. #105
    Big Timer!!! Killmonr's Avatar
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    Quote Originally Posted by RRCoupe View Post
    The way I look at it the K24 is in no way superior to an R18. The gear box can only handle about 300 wheel torque. The engine is pretty much a high compression economy motor with variants making as little as 160hp.

    2012 Si coupe is 2,887lbs
    2012 EX coupe is 2,680lbs

    IMO my R18 at 12psi with a 50 trim turbo weighing in under 2,600lbs after weight reduction, is pretty damn quick I've beaten many 335i's, Si's of all trims with/without mods, Challengers, WRX's, V6 accords, Range rovers, you name it whatever car is considered "Sporty" the performance is pretty much on par. It's also way more entertaining when you pull up to a stop light after, and they just stare at you demanding what type of got dang engine that thang got.

    K24 you have to build it
    R18 you have to build it

    Just a turbo kit with supporting mods for an Si you're in over 7k without a tune. My custom kit with tuning, supporting mods, and some custom one off fabricated parts that no one else in the world has came in at $5,200.

    If anyone is looking into a turbo R18 Greddy teamed up with RevHard and made a bolt on kit for 9th gen R18's. It still says TBA but I've seen come up for sale for around $4,200 for the complete kit.


    I cant imagine my car with a turbo lol

  8. #106
    One Bad Mama Jama!!!
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    I saw a video on octane and it was basically saying that you won't notice any actual improvements if you go from 87 to 91...except for your wallet.

  9. #107
    Truck? What truck?! scottyrocks's Avatar
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    Quote Originally Posted by MaybeCivic View Post
    I saw a video on octane and it was basically saying that you won't notice any actual improvements if you go from 87 to 91...except for your wallet.
    Please post a link. Silver2Coupe has been posting the virtues of 93 in an R18 for years with data to back it up - mostly mpg figures, though.
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  10. #108
    Nooblets RRCoupe's Avatar
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    I drive my car in the city 99% of the time before 91 I got 23mpg after I got 24mpg, and better a mid range/throttle response and the car really didn't loose power after It got heat soaked like 87. With turbo and a really good tune from Steve at etunez I now still get exactly 24mpg with turbo. If you really get joy out of max mpg run 91, with a economy tune some people have seen 30mpg city with an Si. I only run Shell or Chevron while switching between the two between every 4 tanks, both brands use different detergents so why not get the best clean possible. Also my hondata was picking up 10-12 knock counts on 87! After I got it down to 1-2 knock counts on a really hot day with 91 octane with no ignition timing being pulled.

  11. #109
    Platinum Member Silver2Coupe's Avatar
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    I am getting 40 plus mpg with premium in mix driving with my Honda HRV all wheel drive with a R18. I miss the Civic but had a ecu and battery issue with the 15 Civic. I traded it in on a Gen 10 coupe for my wife which she gets 36 mpg on regular it's a leased so not worried about reliability. Yes is different than the R18 but it does not have the reliability of the gen 9 civics.

    My point of my post is the answer is in the question. You raise the compression by using premium gas. If premium gas is only good for a 7.5 compression motor in all load and rpm ranges then how detuned would it be in a 10.6 compression motor. I am no t saying premium raises power throughout the rpm but it raises power where you need it most. I have papers but will not post them. Someone gets mad and the link from the source disappears. It can be found easily if you look.

    The R18 is econ motor which under no knock will use the 3 valve low cam from 1K to 3.5K also has a dual intake like the GSR famous intake the difference is between 20 to 30 percent in better mpg. I love the R18 and is why I bought the HRV. The HRV is rated from 26 city to 31 hwy. I am averaging 35 to now 40 mpg.

    The ecu has to adjust and you have.to drive different. Usually the first tank is lower because its relearning and I call it a burn in break in. It's not going to make your car into a race car but its easier to drive and has the 10 hp you are looking for along with better mpg.

  12. #110
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    Quote Originally Posted by scottyrocks View Post
    Welcome to 9th gen.

    One member that I know of here got noticeably better results using premium fuel in an R18. That, and a custom tune would be a good start, or rather, what I would do if I was so inclined.
    Thanks for the advice. For everyone assuming that I am trying to squeeze out tons of power from this car, I am not.

    I’d be receiving it completely paid off. I’m willing to spend in the neighborhood of $1500.

    Can this car become comfortably faster? I think what I wanted to know is, what are the most sensible modifications one can make to give this car just a bit more.

    Seems like the honest answer is : don’t mess with it. It’s good with a proper tune and you won’t get more noticeable power out of it. Use premium fuel. Possibly a cold air intake.

    I was really looking for the smartest route in making subtly noticeable gains.
    scottyrocks likes this.

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