are stock jdm engines faster than usdm stock engines?

i was wondering the the stock jdm engines produce more hp stock than the usdm. for example i saw a jdm b18c1 w/ 178 but the usdm stock b18c1 w/170. are the ratious just different or what?

yes JDM motors do have a bit more juice than USDM versions... mostly due to emissions, and engine management tweaks... as well as design changes in the motors because of the aforementioned emissions, and engine management...

compression is also upped

The B18C1 is just the B18C is Japan, JDM engines don't have a number after the 2nd letter (I.E. B18C1 is USDM, B18C is JDM. The JDM Type-R motor is also has a "b18c" code because of this).

Anyways, JDM motors usually have about 10hp extra. The reason is simple. JDM motors have a slightly higher comperssion ratio. That is mostly responsable for the slight bump in power output, though tuning plays a part also (evident in the fact JDM motors typically hit the peak HP at a slightly higher rpm). I don't have the actual numbers in front of me, so if these are a bit off, I appoligize and will correct them. I know the B18C1 (USDM) has a 10.0:1 c/r & 170HP. I think the JDM B18C is 10.6:1 and 178HP (JDM B18C type-r is 10.6:1 c/r & around 195HP or so). USDM B16A have 158hp & a 10.2:1 c/r, while JDM (92+) B16A's have a 168hp output and a 10.4:1 c/r.

Anyways, so to make it simple, JDM motors make extra power due to the slight bump in comperssion ratio, though tuning plays a minor role also.

don't you want to down the compression if your going to turbo. and why is this?

oh and by the way i'm buying a civic and i'm thinking about the sir2(b16ag2) and i was wondering if this is a decent swap. and where is the cheapest one like online that i could get with tranny and like wiring harness and everything.

don't you want to down the compression if your going to turbo. and why is this?

i think this is because you want less pressure in the chamber, but i could be retarded.

oh and by the way i'm buying a civic and i'm thinking about the sir2(b16ag2) and i was wondering if this is a decent swap. and where is the cheapest one like online that i could get with tranny and like wiring harness and everything.

try www.inlinefour.com or www.hmotorsonline.com. these are both good places. i would recommend hmotorsonline though because they have cheaper prices and have heard they have better customer service as well.

mrlucci4051, yes you generally want lower compression in a turbo'd motor. This is because turbo's forced more air into the cylinders, which in way raises the compression ratio when boost is on. For example, if a motor is boosted to 14.7psi, it has twice the air in it that the motor would have naturally asperated (this is why you need more fuel delivery, the stock fuel amount isn't enough to burn this much air, it's too lean, which would lead to detonation). This is also why boosted motors should run higher octane fuel. Octane is a fuels ability to resist detonation. Basically, a higher c/r motor boosted is more prone to detonation, which will destroy the motor eventaully (sometimes sooner than later). It is possible to mix high c/r and boost for big power, but you have to keep the motor in tip top funning shape or detonation will occur, which will kill the motor. I don't recommend you try this. Gernally, most people will say a 9:1 c/r or there about is a good turbo c/r. The 2nd gen JDM B16A has a 10.4:1 c/r I believe. You should be fine up to 8psi on stock intenrals on that motor. I am guessing that will be plenty quick for you. I know of cases where people have run higher boost and it's lasted for a while, but again, it's constant tuning, etc. In general, 8psi is considered the top "safe" number to boost the B16A and GSR. The non-vtec b-sereis motor, the LS (B18B1), can be boosted to 12psi (it has a 9.2:1 c/r).

The B16A is a decent swap. It has a little higher c/r than a GSR (USDM) and doesn't doesn't have the extra torque of the GSR (USDM) or the extra low end torque or an LS, but I havn't heard anyone complain about it. Boosted to 8psi will put you well over 200HP, and lag won't be an issue at that boost. That will give you a good responive turbo. If you are running low boost (about 300HP or under), check out the Disco Potato turbo from Garrett.

Also, here are some sights for motors
www.ardperformance.com/cgi-bin/indexjd.pl?action=index
www.nippon-motors.com/
www.inlinefour.com
www.hmotorsonline.com

all of you are wrong its simply due to there 1337 JDM YO!

all of you are wrong its simply due to there 1337 JDM YO!

And to Ace$nyper goes the "most intersting post of the day" award...LOL

And to Ace$nyper goes the "most intersting post of the day" award...LOL
yea i'm really fucked up and near a keyboard so can i get that award in cash i might need a new liver

ecko man whatcha think about supercharger vs. turbo charger. on a b16 which do you think would be the best way to go?

ecko man whatcha think about supercharger vs. turbo charger. on a b16 which do you think would be the best way to go?

Well, my opinion on Superchargers? I hate them for, period. For one, they are belt driven. This means a belt running off the crank turns the compressor to compress the air. True, this renders almost no lag, but it causes parastisic horsepower loss. Remember, it takes power to turn the belt, which turns the compressor. A supercharger takes power to make power. A turbocahrger, on the other hand, is more like free power. No belts. It uses exhuast gases to spin the turbine which compresses the air. Exhuast gases are waste anyway, so it basically takes engine waste gases and uses them to create horsepower. This means no parasitic horsepower loss. Unlike a supercharger which is belt driven, it doesn't take power to make power. On a small turbo, like the Garrett "Disco Potato," (actual name is Garrett GT28RS) Turbo lag is not an issue. Especially with the Disco Potato. This new turbo is perfect for boosting 1.6-2.0 liter motors up to 300HP. Best of all, thanks to the all new design, it offers extremely quick response and almost no lag. Still, lag on smaller turbo's isn't an issue. Also, a turbo is a better choice to make big power than a supercharger. If you are taking 300, 400HP, a turbo is your best bet. At such a high power level like 400HP, you WILL have turbo lag, because it little longer (higher rpm) for the turbine to spin fast enough to compress the air in the big housing. Still, even for low boost apps, I prefer turbo. Lag isn't an issue, especially with the GT28RS turbo. You don't have parasitic HP loss, the right turbo choice gives you qucik response. I always think a Turbo is the best way to go. For big boost, don't bother with a supercharger on a Honda. For low boost, turbo lag isn't an issue. Basically, turbo and superchargers are 2 different ways to forced induction. I perfer the turbo way. No parasitic horsepower loss, not much lag on low boost, and they are better and more effeicent for big boost. If you want my choice of turbos, check out the GT28RS (Disco Potato) if you are looking at 300HP or under.

alright so eckoman, for a daily driven vehicle would turbo be the safest bet?

alright so eckoman, for a daily driven vehicle would turbo be the safest bet?

I'd go with a turbo (make sure to use an intercooler) running low boost, say 8psi or so. That should give you an extra 80hp or so (give or take), which is more than a supercharger will give you. It'll put you well over 200HP. That should be enough extra power on a daily driver, and the turbo will be responsive: you won't have much lag at those boost levels. Just keep the motor tuned right.

Also, remember, whether it's turbo'd, supercharger'd or stock, the harder you drive it, the quicker it will die. Running a turbo @8psi on the motor will be safe. Use a Hondata if you can afford it, especially if the kit comes with a fuel pressure regulator. They arn't that great, Most supercharger's and "turbo kits" come with one as the fuel managment, so you'll want to think about that. A Hondata is bascially a Honda ecu that has been reprogramed, they've cracked the factory codes so they can re-progam it for whatever your needs are. It basically funactions like a stand-alone ecu. Keep the motor tuned and don't abuse it, and you'll be okay.

A low boost turbo is the route I would go on a Daily Driver.

ahh that's a big help. i think i'm gonna trust you on that one. Now THE big thing should i get like a shell from the u.s. or maybe try and get a shell from japan and have a right hand drive? And how much do you think i'm gonna be spending 'cause i'm gonna do all this stuff within the next month

I am guessing you are in the US, right? If not, where are you at? If you are in the US,it will be much easier and much cheaper to get a car here and dump the motor into that.

yeah in live in good old Gainesville Florida!

yeah in live in good old Gainesville Florida!

Yea, that being the case, just get a US car and build that.