are stock jdm engines faster than usdm stock engines?

[mrlucci4051]

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?

[killah_xft]

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...

[liquidflame8]

compression is also upped

[eckoman_pdx]

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.

[mrlucci4051]

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

[mrlucci4051]

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.

[projectsilvia97]

Originally Posted by mrlucci4051

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.

[projectsilvia97]

Originally Posted by mrlucci4051

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.

[eckoman_pdx]

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
http://www.ardperformance.com/cgi-bi...l?action=index
www.nippon-motors.com/
www.inlinefour.com
www.hmotorsonline.com

[Ace$nyper]

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

[eckoman_pdx]

Originally Posted by Ace$nyper

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

[Ace$nyper]

Originally Posted by eckoman_pdx

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

[mrlucci4051]

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

[eckoman_pdx]

Originally Posted by mrlucci4051

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.

[mrlucci4051]

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