250 bhp atmospheric?


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kennytje0

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Nov 1, 2012
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hi,

first of all sorry for my very bad english.

i have and b18c4 engine, im planning on trying to reach 250 bhp without turbo.
im not building the engine myself, a good friend who has a great knowledge of honda engines helps me as im learning.

so i made a list but im not sure if this wil do for my goal.

wiseco high comp pistons
eagle h-beam rods
edelbrock performer
aem v2 intake
aem feulrail
fidenza light flywheel
act stage 2 clutch
hondata
toda 2.5" exhaust manifold
skunk 2 catback 2.5"

tyvm.
 
You will not reach 250BHP with that spec.

You'd be lucky to get 200BHP with that. 250BHP NA from a C4 will cost mega money. Stock C4's are perfect for turboing, why not go down that route to reach your power goals?
 
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because i'd like a very empty and clean engine bay, and because i don't know people who have expierience with turbocharging a honda.
 
Jason speaks sense. you'd need a whole lot more than that to get to 250.
not sure the B18C4 is designed to rev as high (though i'll be honest i only know C6's and jdm c's) and you'd need to find a way of still producing enough torque with a considerably raised rev limit. which entails a lot more work such as block braces, extremely well balanced internals, a pretty insane compression ratio and most likely bespoke inlet and exhaust manifolds matched to your cams and internals to enable a pulse charge effect.

my advice get a K20 conversion or turbo that C4 it will cost you less and will give you much more usable power
 
it's just i don't think its worth the money to pay about 1500-2000 euro for sleeves
(approx 1300-1700 pounds)
 
i know the total cost will be alot more, but that amount of cash for only sleeves.
 
You don't need sleeves for turbo as long as you stay under 300 Bhp (maybe even more but 300 is safe on b18c4)
 
what kind of setup i need to think of then?
good tuners what do they ~cost, cause prizes vary alot.
 
Just a basic/street turbo kit, fuel pump, injectors, boost controller and a tuneable ECU.

Good tuner is between £300 - £500 in the UK but you'd need a good tune for turbo or non turbo anyway.
 
Ive got about 230 bhp from 1.9cc, im working out the cost for that, will lwt you know
 
The b18c4 can handle 400bhp, obviously uprated pistons etc. A b18c4 I worked on ran 400 + and it's still going strong. Will try and find the spec list
 
Some quick math on engine limits says that it's going to be difficult.

Don't expect better than 215psi BMEP, that's 156lbft in an 1800cc engine.

Don't expect to reliably achieve mean piston speeds better than 25m/s. That's 8600rpm on an 87.2mm stroke.

Now, while 156lbft at 8600rpm might equate to 255bhp, I can assure you you will not be making that kind of torque at that kind of speed.

Why do you feel the need to hit 250bhp anyway? Sounds like pub bragging rights to me.
 
well ive owned and audi s3 8p ( year 2007 265 hp 2.0tfsi).
when my girlfriend got pregnant unexpected i had to sell the car.
at this moment she owns a ej9 with b18c4 but when our new car comes ill be selling my car and get the ej9.

im planning on getting a fun ride thats why i want about 250 bhp and do some trackdays now and then
 
Forget the power goals, just build it up to a reasonable spec and enjoy it.
 
Well, bear in mind that you'll need a lot less power than your S3 had for it to be as quick round a track.

Personally I would avoid all the bling bits and focus on the stuff that gets proper gains. Get a decent exhaust system, raise compression (OEM pistons out of B16A/B18C would do) a decent head setup (springs, retainers, cams and gears) and a mappable ECU. With all that 200-210 bhp should be possible and that would probably give an S3 a good run.
 
OK, FYI Ford Fiesta S2000 produces 280bhp from a 2 liter engine. So 250 out of 1.8 is I think possible in theory, BUT - do you really think your friend (no matter how good you think he is) has the same level of expertise, experience and mainly the resources as M-Sport who built the Fiesta? Not to mention that such an engine would be constantly working right on the edge, for example the engine in the said Fiesta S2000 rally car must be REBUILD every 1500 km! Rebuild, not serviced! If I had the money I would also go the high comp NA way, just for the challenge, but if you want a reliable motor that won't cost you an absolutely insane amount of money go Turbo or SC. In the end you would probably end up spending all the money you got for your S3 just on the Civic, remember, it's not just the engine that will need upgrading......
 
i know in the end it will cost around an s3 or more, but if i had the money i'd buy and s2000 or nsx.

i have about 300-325 pound (400 euro) to spend every month.
and im planning to do the build over a couple of years.

but im thinking of a turbo.
but what changes are a must?

for example i see alot of turbocharged cars with an edelbrock victor x wich is good for turbo applications but it's only a must for over 700hp engine ive heard.

things i think i need besides a good tuner for turbo are:

turbo( garrett, turbonetics)
blow of valve
turbo exhause manifold
pipes etc
intercooler
injectors
valve/springs/retainers
eagle h beam rods
wiseco low comp pistons
oil catch can
boost controller
extern wastegate
3" exhaust
( thing under the block for oil , don't know the correct english name)


probably some other stuf i forgot to mention
 
Standalone ECU
Uprated Brakes
Uprated Suspension, in fact you should upgrade the brakes and suspension BEFORE you do anything to the engine...
You may the want to consider changes to your transmissions - clutch, gearbox/final drive as the car may have issues with traction. LSD with this kind of power output is a must I think. The list will go on and on... Have a look at a few build threads from people who did a Turbo build and you will get a much better idea, Rich777 is one of them...
 
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