I am getting a B18B put into my civic since it is basically scraping along on its last leg right now with its D16.

I have done some reading on the LS, and I was wondering is it possible to boost the LS with just low compression pistons and the stock rods to the point it would hit about 300 hp- and live?
I've read that the rods it comes with are really stout thats why I ask.

Also, would DSM injectors work to that degree?

 

leave pistons alone, just get arp rod bolts put it some dsm 450cc and call it day.

If your going to change just pistons mind as well change everything. wouldnt that make more sense?

 

No.
Because obviously at 300hp I am not going to need to roll forged or anything super high end like that.

At 300hp I am going to be more concerned with dropping my compression ratio, and that would either call for A. shorter rods or B. lower compression pistons.

Its one or the other man!

 

You dont need either. Stock LS is ~9.2:1 which is pretty much perfect. Theres tons and tons and tons of stock LS setups running around. Theres a 1000 page thread on LS setups.

 

holy crap, I mean- even with a basic turbo system like an autoworks and those injectors its still possible to hit that much power?

how hard/annoying is it to VTEC an ls?

 

Uh yeah lol.

300whp is easy. 14-15lbs, typical 57 trim turbo, log manifold on a bone stock motor. Like I said, its been done 1000's of times and recorded.. If you want more the cams become the limiting power.

As far as reliability is concerned 300whp is also the magic number everyone seems to like to stop at. Beyond that the ringlands on the pistons and the sleeves will become a concern for some people.

 

The sleeves are never a good thing to have turn into an issue lol.

If I was to boost to 270? and then cam and port it the rest of the way would that help my cause?

 

LS Vtec is a simple swap. If you can replace a head on a car you can do a LS Vtec. The stock B18B can handle 300whp easy on stock internals 350whp is pushing the limits. The Vtec head will get you to 300whp on less boost 8-12psi on a 57 trim so big plus and the P75 head just flows like crap and has tiny valves and ports.

 

So after some research...
I was thinking using a GSR head or a B16A2 head with some type R cams?
Edelbrock intake mani and a larger TB?
That with the turbo system could net me the 300 and be easier on the engine right?

 

Sure. but Edelbrock intake manifold is completely unnecessary. I honestly would NOT use the DSM 450cc injectors because of the fact that they were more than likely not cleaned and tested. you would have to raise fuel pressure in order to do that power level. Give yourself a bit of breathing room without going to ID1000s. 550-650cc are fine for this. spend money on that.. not some intake manifold.

 

plus the victor x will raise your powerband higher than you probably want to go, 9k+rpms

my stock bottom end lsvtec gsr head b16 cams, itr intake mani, ebay kit 8700rpm and was still climbing in power

 

I agree either stick with the stock mani or get a Blox or Skunk2 mani. For sure run at least 550cc injectors.

 

Stock intake is fine unless you get aftermarket cams. Aftermarket intakes will do nothing for you on stock cams. <---from experience

 

These threads crack me up..... "ls turbo" gives like a million hits of information.... the problem is no one wants to actually grab a cup of coffee and READ through them... they want to be baby fed the answers via making their own thread.....

Anyway,

Dude, first things first, compression test and leak down test the LS motor you have.... if everything checks out good then there is nothing more you need to do to the motor.
2nd, get a good turbo kit as you already mentioned autoworks, full-race, whatever your heart desires....
3rd, Get better injectors than the DSM 450's.... yes you can use them, yes they are cheap, but lets be honest they are prob almost 20 years old.... spend the money in the right places here (IE: the intake manifold is a waste at that power level, stock will be perfectly fine)
4th, if your dead set on going VTEC head, your going to need a LS/VTEC oil sandwhich plate, the head, and a new headgaskett, but obvioulsy you will pick up some significant power here (you can hit 300 easy with stock LS motor by the way)
5th AND MOST IMPORTANT, get car tuned professionally.
6th Enjoy.

Stock pistons usually are good to 300 maybe a little more, kinda varys, stock sleeves are good for 5-600whp so no worries there, again this all assumes you get a good tune and have parts that are going to work well with each other (IE 450DSM injectors would not be a good idea) any lean condition since your going to have to push them to get 300whp could spell disaster.

Again, man, this forum is littered with EXCELLENT information, help us help you by at least educating your self a little bit more before making your own thread... not attacking you, just saying this is very very common stuff and easilly found if you just take an hour or 2 to sift through some threads.

Good luck.

 

Stock B18B + decent turbo kit/tune = 300 reliable whp all day long

Stock B18B block + stock B16 or GSR head LS/Vtec = 300 reliable whp all day long (Just at lower boost pressure, as the LS/Vtec will make power easier than the straight LS motor)

 

^^^ Yep that is why I went with a B16 head on my LS block, same power on less boost plus Vtec cracks.

 

Why would you spend the money for only 300whp though

 

Personally, I wouldn't, I would go straight LS.

But some people just want that elusive mad Vtec.
And if he does decide to build the bottom end later on and go for 450+ whp, he will be good to go with a vtec head, with an LS head he wont....

 

Straight LS motor would rape a b16 motor all day long too on the streets.... usable power is the take home message here