Pressure Ration, Airflow and all this compressor maps, need help
 

hi

i am from germany and it semms that this board can help me a lot.

at first, i have a honda civic coupe D16z6 and a complete rebuild engine in it with 9:0 turbo pistons, Eagle ESP rods, complete new valvetrain (a little bit ported), stock Crank, stock Cam, Blockguard installed.

at this time i drive without a turbo but the turbo is behind me and i will put that thing on it.

the turbo is from a nissan S13 1,8 liter engine. i have new, 450ccm injectors, a "ready to chip" p28 obd1 ECU.

i have no wideband !!!

now to my questions. i have a compressor map from this turbocharger and i do not understand some things. i know what pressure ratio is but i dont know how much air flow come out of my engine...

Ps: have anyone tested the uberdata rom editor ? thats my next problem :(

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

I use uberdata on my d16z6 with a P28, works great ;)

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

whats about the turbo ? is it good for the d16z6 ?

do you have a basemap for me ?

must i change my MAP sensor ? i will drive 12 psi (i think the turbo is set to 12 psi)

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

maybe this can help you

The volume air flow (VAF), measured here in cubic feet per minute (cfm), is a linear function of engine displacement (here in CI), compression cycles per minute (RPM/2), and volumetric efficiency (VE), as shown in the following equation.
VAF = (CI/1728) x (RPM/2) x VE

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

ok, it seems to me that my engine have a air/flow ratio of 30 lb/min (406 cf/m) ?? is that possible for a d16z6 ?

the turbo puts 12 psi at ???? RPM

from some basemaps from garrett is a gt2860 a good choice for the d16z6 engine. a gt2560 seems to me too small. i think this gt2560 cuts up before the RPM on the limitter.

someone tells me, the nissan s13 turbo is like a t3 .48 A/R. is this correct ?

please tell me when i am wrong.

edit: i have found that: 1 HP approx equals 1.45 CFM

so my car has 125 HP and than it must have 181.25 CFM so it must have an Air flow Ratio of 13,50 ? then is this gt28 much too big.

i am confused abaout this Airflow an Pressure. Pleas help me out :(

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

post up the compressor maps your using, and what you used for Volumetric Effieciency numbers.

i can try to help you out

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

This also has a lot of helpful information. Taken from the FAQ.

http://www.stealth316.com/2-3s-compflowmaps.htm

This place as well:

http://www.turbomustangs.com/turbofaq.php

As well as this site:

http://forcedinductions.com/help.htm

And if you're even more interested after those, then Maximum boost and a few other books are helpful.

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

how to read compressor maps
http://www.sohchonda.com/forums/inde...showtopic=6683

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

turbo calculator
http://not2fast.wryday.com/turbo/glo...rbo_calc.shtml

Re: Pressure Ration, Airflow and all this compressor maps, need help
 

thanks for this links, that helps me a lot.

i think that the nissan T25 A/R .48 a little bit too small is for me. i will try a A/R .60 T25. my goal is 250-280 HP.