MidShipCivic

Whats need to calculate volumetric efficiency?

I searched a bit and found these :

volumetric efficiency = acutal cfm / theoretical cfm x 100

theoretical cfm = rpm x displacement / 3456


Help me out

vtec.dc2

are you trying to just find out in general or to calculate the right size turbo? second formula is straight forward.. i guess thats good enough

MidShipCivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">are you trying to just find out in general or to calculate the right size turbo? second formula is straight forward.. i guess thats good enough</TD></TR></TABLE>


Yeah for the ideal turbo for my application.

2muchPSI

I think you would have better luck just looking at compressor maps of your possible turbo selections, and just figuring it out from there.

MidShipCivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2muchPSI &raquo;</TD></TR><TR><TD CLASS="quote">I think you would have better luck just looking at compressor maps of your possible turbo selections, and just figuring it out from there.</TD></TR></TABLE>

Is the math for VE correct up there I only found that on H-T I dont know if thats right.

vtec.dc2

i haven't done this in a while.. but i did write some of the links down as i did the search.. its as complicated as it is simple.. complicated if you try to follow every step and formula, simple because you don't have to be precise on the dot as it won't make dramatic difference, you could reference to what others use and most of the time its oversize so just make sure its nothing larger than what they use for that hp level.. calculate compressor, then a/r trim - there are forumulas to caluclate everything and all included in archives, another link not included in here is turbo size calculator - search arvhives for it as well..

heres some reference i found a while back:

http://www.majesticturbo.com/compression.html
http://www.bsmotor.com/turbo/tabell.html
http://www.turbofast.com.au/tfcalc.html
http://www.gnttype.org/techare....html
http://home.planet.nl/~jwq/turbo_expl.html

http://www.stealth316.com/2-3s-compflowmaps.htm
http://www.stealth316.com/2-adiabat1.htm
http://www.stealth316.com/2-turbotemp.htm
http://www.stealth316.com/2-air-fuel-flow.htm

http://www.aquamist.co.uk/resc....html
http://www.installuniversity.c...0.htm
http://www.nightrider.com/bike...e.htm
http://www.me.mtu.edu/~duane/ME450.txt
http://www.hondalife.com/articles/headtech.htm

http://www.csgnetwork.com/cfmcalc.html
http://www.superford.org/garag...x.php
http://www.wheelspin.net/calc/

http://www.superflow.com/super...e.htm

MidShipCivic

Thanks

Joseph Davis

I love you, Flamebait... I knew you would make me proud. Most people don't ask questions like this, they just want to know, or to be able to infer, "a good turbo for my setup."

vtec.dc2

np..

while we're here..

some more threads

https://honda-tech.com/zerothread?id=2827369 - volumetric efficiency
https://honda-tech.com/zerothread?id=325722 - volumetric efficiency
https://honda-tech.com/zerothread?id=142398 - reading compressor map
https://honda-tech.com/zerothread?id=320706 - reading compressor map
https://honda-tech.com/zerothread?id=153810 - a/r
https://honda-tech.com/zerothread?id=342601 - some more stuff

https://honda-tech.com/zerothread?id=233598 - the calculator, if link still works

https://honda-tech.com/zerothread?id=428275 - just lots of mics. links in that one..

Naterror

Actually you need to know a few things about the motor first before you can figure out the VE. You must put it on a dyno to know exact numbers though. But the rest you can figure out here.
http://www.turbofast.com.au/tfcalc.html