93camaro_zzz

iTrader: (13)

Wrong. Sorry dude. Displacement is a measurement of volume. Boost increases the density of the charge, and like roninsonic said, it does increase your volumetric efficiency. The whole definition of VOLUME is this:

The quantity measured by a three-dimensional space enclosed by definite boundaries.

How in the world does a turbo change the boundaries of your motor? Do explain for us please.

Theblacknightls1

iTrader: (1)

OP seems like you ran into somone faster is all. Your car still a awesome platform and has lots and lots of potential. H/C should beat that 4cyl you raced but won't beat them all

kciaccio

This might cheer you up a little.
Good old GM product giving it to a STI this week.

http://www.youtube.com/watch?feature...v=JZSJrFvOaLM#!

MikeyZ

iTrader: (20)

Simple math would explain how a turbo works.

14.7psi max amount of air possible with out compression
20 pounds of boost.
2.5 liter engine

14.7 + 20 = 34.7 / 14.7= 2.36

2.36 X 2.5 = 5.9 liters.

kingof951

iTrader: (1)

adam is correct. displacement as defined for engines refers to volume of air of the cylinder that the piston displaces (and compresses) from tdc to bdc. volume efficiency is how much air you can cram into the same space of that cylinder to be compressed... thats where compression ratios come in. ex. a 3.0L with double ve would be relatively equal to a 6.0L power wise in a perfect environment with all other factors of each motors being equal and compression ratio being doubled on the turbo'd car(which is never the case lol) displacement is still very much relative but volume efficiency and the efficiency of the use of the air/fuel should also be noted. if i got something wrong sorry its been a while since i took all my mechanics classes lol.

kingof951

iTrader: (1)

looks like a copy paste from wiki lol

LT1559

iTrader: (5)

I totally give respect to all those who have beat me. I have no shame in losing. But damn this guy was just eggin' it on. First was his "it's just a little four banger bro" no ****! I reply with "what do you have done to it?" same response "it's just a little four banger bro" Then I tell him " yeah, I can see that. I used to own a wrx" and he says "you should've kept it" and lastly I replied "yeah well i get better mileage" lol I don't know if he was pissed or confused after I said that but he just shook his head

fengstang

iTrader: (2)

Sounds like a driver mod to me

roninsonic

iTrader: (3)

this thread contains a LOT of misinformation... Adam's posting up some pretty good info, though.

Also, I've never seen that formula for displacement before ((Bore^2)x(stroke)x(number of cylinders)x.7854* )... I always used (bore/2)^2*pi*stroke*(number of cylinders)

LS1Adam84

iTrader: (21)

It's the same formula but moved around a little, both are accurate and give you CI.

But I'm in aggreance with you, it's the understanding of displacement and VE that is getting mixed up.

If turbo's add displacement then what you would need is a bigger turbo everytime you added a turbo. You need your displacement, map, and rpms, to choose the turbo suited for your build, hence the compressor maps that turbo companies provide. If you add a turbo and it adds displacement as being said, then you would need a larger turbo because you are displacing more air therefore you could spool a larger compressor right?

2 FASST SS

I lost to an STI a couple of times and H/C fixed that problem. Also solved a few others
Get to modding and your issues will be cured.

98BLOWNZ28

iTrader: (10)

this tread is too funny. i guess i roughly have a 12 liter motor then?

LS1Adam84

iTrader: (21)

Yeah you do.... lol.

SpeedyMerrickan

Ricer Math.
More Stickers = Speed
Lower = Speed
Louder = Speed

Burken01

iTrader: (88)

Lol a 2.5 liter motor is just that, a 2.5 liter motor..

Even if its at 400hp @ 14psi

But keep the thread going, there ain't **** else to talk about

silvea

iTrader: (1)

Lol I love the arguments so let's jump in on it. The 2 sides arguing are both correct. A 2.5 liter engine has 2.5 liters if natural displacement. But when adding additional air it alters natural displacement for actual displacement. So if the 2.5 liter car is pushing enough boost it could put out 5.9 liters of displacement. Still doesn't change the fact that it naturally displaces 2.5 liters at 0 boost. You classify motors by natural displacement not what boost makes it displace

Burken01

iTrader: (88)

this

we all have to follow MotorTrend magazine rules

silvea

iTrader: (1)

I think its done for simplicities sake.

fruitsalad

iTrader: (5)

but neither turbos nor centrifugal superchargers are positive displacement... only roots and twin screw

ArcticZ28

iTrader: (14)

http://www.bgsoflex.com/displacement.html
http://www.csgnetwork.com/cubicinchdispcalc.html
http://www.everything2stroke.com/con...ent-Calculator
http://www.roadkillcustoms.com/hot-r...Calculator.asp

I don't see any engine displacement calculators asking what size turbo or boost the engine's running. Engine displacement calculation involves only the volume of the cylinders, no matter what else is bolted on to your engine. VE, however, does take into account flow/compression, a formula of which CID (displacement) is a part.

http://www.bigboyzcycles.com/VeCFMCalc.htm
https://ls1tech.com/forums/advanced-...fficiency.html

I also got beat by an Evo a while back. My car put down 475 on a mustang dyno and the Evo had a few minor bolt-on's. Traction > HP.