Hey guys I have a 94 civic coup with a D15b7 that I use for a backup daily driver. I'm looking for some ways to up the HP. Currently in the process of replacing valves and thinking about upgrading cam and piston rods. Any other ideas has CAI and custom exhaust already.

 

There isn't really anything you can do for that engine. Wither leave it stock or do a swap.

 

https://honda-tech.com/honda-civic-d...tions-1998336/

 

Not really trying to do much just get a little over 200hp. I want to keep the engine and do some internal work and turbo it. The valves are **** so had to take the head off anyway, figured I would go ahead and give it some extra pick up while I had the head off.

 

I also have a B7 and what I have done so far is full exhaust; header, cat delete w/ resonator, cat-back, 3" custom short ram intake and ported throttle body, short throw shifter. Those few things were a good improvement over when I first bought it. If you want a ride with some decent get up and go, the B7 isn't a bad engine if you keep it simple. If you want to go crazy, then go with something else.

 

"just a little over 200"

Theres nothing 'just' about it. Thats approaching the limits of the OEM rods. Stock pistons are OK as long as you have a real solid, safe, tune. You will for sure need a turbo to see 200 unless you have a spare $8k to spend on it.

 

I don't think 200 is to steep for the b7 seen a few b7 almost double that. I plan on replacing/upgrading the rods anyway.

 

Swap it, that's about it.

 

I would LOVE to see a stock b7 lower end hold that.

 

Challenge accepted...

 

And shot peening the stock rods is pointless as they are already shot peened by the factory I learned awhile later.

The stock B7 block isn't going to handle anything over 200 HP and even that is pushing it.

If you switch to forged rods and pistons then you can be in the 300-400 range with a turbo and not throw a rod.

Best of luck not destroying one of the weakest bottom ends of the 5th gen civics.

If you want a fast boost in HP there is two ways to go without dropping a fortune on forged internals.

First is an aggressive camshaft like crower stage 2 or 3 and then a complete tune, or a D16Y8 head with a stage 1 or 2 camshaft upgrade with a solid tune.

Anyway you look at it, you are in for at least 500 bucks on a solid tune no matter what way you go.

 

it IS the weakest bottom end. cheapest way to upgrade: d15b vtec crank, oe ls/b16 rods. 200 reliable whp is a pipe dream without lots of cash. i don't like nitrous at all, but for what you want to do, it might be the only option.

 

This.
GL.

 

Just about every OEM rod for everything is shot-peened. Aftermarket shot-peening can help a bit, but for the gain for cash spent, stronger rods are the better option. Its $125 to shot peen 4 rods for maybe a 5-8% improvement in strength.

 

I have a semi-built 12:1 comp LS/VTEC B18 with some quality parts on it, I spent around $3000-$4000 I think. I made 199hp 137tq at the wheels, so I KNOW you're not gonna make 200 hp with a D15b7 without some serious money involved.

 

What do you refer to as "serious money"? Anyone ever put any REAL effort into fully building a B7?

project turbo civic hatch d15b7

The kid in this thread had a hell of a setup (that wasn't even appropriately tuned) on a 200k+ engine he abused for months before it grenaded.
This was on a B8 bottom end, but the only difference in between the B7 and B8 was 8v vs 16v.

The B7 is an underrated competitor that nobody wants to spend much time on because it isn't "JDM tyt3 yo" and there sure aren't any D15 bandwagons out there i've seen..

 

Like 10-15 grand or more. Sort of a waste as you will max out around 350 HP maybe 400. 10-15 grand on a K series can net you 700-1000 HP.

Months, not years. Exactly the point being made. Turbo on stock b7 internals will go fast, for a short time.

For longevity you have to dump money into the engine and for what you get per dollar, it's not wisely spent.

I believe Bisimoto managed to scrape 170 HP out of the B7 naturally aspirated, what I don't know is just how many dollars he dropped into it beyond at least 300 on a custom ground camshaft and then another 500 tuning minimum.

More than likely another few thousand went into rods and pistons as well as balancing for 10K rpm etc. etc.

You want unrealistic goals on a 1.5L with the weakest stock internals of the generation.

There is no replacement for displacement. Get yourself at least a 1.8L to play around with, at least then you can reliably reach your 400 HP goals.

 

HP doesn't matter for passing power. Torque is what matters.

 

no d15 bandwagon?!?!?!?!?! dseries.org, lol

 

I hadn't thought that particular statement all the way through it seems. Lol. Forgot all about that site.

Tomcat- There isn't a point made, or in the making here about longevity. Everyone is claiming it can't be done
Anyone in their right mind knows that you aren't going to achieve longevity on ANY build, ANY brand that increases stock engine power by 100% or more without reinforcing it.
I'm also not sure of where the 10-15k pricetag is coming from unless 2/3 of that is tuning. Maybe if you're getting custom parts left and right? I've compiled a "done right" list and it hasn't even broken the 5k mark.

The OP also never stated anything about 400hp or touted any unrealistic goals. They said a little over 200hp. This is not an unrealistic goal for this engine and longevity depends upon whether or not internals remain stock.

What I myself have planned may be considered unrealistic and laughed at by many, but that's another story altogether

 

Many types of engines can withstand a 100% power increase in stock form and be plenty reliable, d-series engines are not one of them.

That being said I don't think OP thought out his initial question, also mentioned wanting to street race and has not come back.

OP should do a swap, /thread.

 

This.

We werent talking about a BUILT D series. We were talking about a bone stock, factory, unopened many thousands of miles D15B7. That will NOT live long at 200+ whp.

 

I'm surprised you haven't broken the 5K mark. The Skunk2 Alpha IM alone is 1000. Let alone having Endyn port the engine head, sleeve the block and put in their roller wave pistons.... I'm already past 5K I'm pretty sure and we haven't even touched the the camshaft, the springs and retainers, nor the ATI super damper, the high volume TODA oil pump nor the forged rods to supply endyn with.

Then you need all the turbo parts which I figure for a quality turbo setup is 3-4K (could be wrong in my assumption here), then tuning and the hardware like Neptune RPT or maybe go with an AEM ems or Haltech....

Yeah I see the build easily hitting 10K to properly build the D15B7.

I also haven't priced the machine work to enlarge and fabricate main caps to accept the D16Z6 crank for the superior oil handling.

But yeah, stock B7, not going to do 200HP reliably is the crux of the matter.

 

Just do a swap bro. I bought a JDM b18b for 500 bucks. Ima slap a turbo on it later on with some bigger injectors. 350hp or more. Just with a turbo kit and a tune.

 

Tomcat- IM and TB combo, skunk2 is just shy of 350. Intercooler: varied, I priced one to support up to 400hp for 219. Turbo manifolds: varied. I priced SEVERAL options for under 100 bucks. The list goes on. Lol. Hell, you can purchase an eBay kit for 900 or less and just buy a separate turbo (if you don't want to trust the one you get). Anywho, the list I came up with wasn't near 5k, and it was pretty complete. I'm also cutting a ton off the top by doing the porting work myself. Looks like the majority of your cash is being spent on a name. The best will always be the most expensive, but the most expensive isn't always gonna be your best option.