g/s to cfm

[CSH-HQ]

>
>I saw a post a while ago that listed 604 cfm to make 406 flywheel HP 
>in one case. the same post (ref: 26 jun 99, Mark Romans) listed a 
>355CI motor that maxes the MAF at 255 g/s at 4600-4700 rpm...
>
>My question is, what g/s equates to what cfm at what temperature (I 
>can't find any conversions in my books). the 
>ultimate question is, what HP level is supported by 255 g/s.

Depends on the VE of the engine.
At standard temp/pressure I thinks it's 1.09 grams/ cubic ft air.
So like a 231 buick turbo uses about 115 ci in per rev.   So at 4000
rpm uses 462,000 cu in divide that by 1728, and it's using 267 CFM.  MAF is 
a 255 which flows 277.  So figurun 120% VE you have max air at 3,200 (er 
accurately calibrated air/fuel).  

True is that's at 100%VE, and a Hot Turbo motor can do 140% VE.
Then a good street NA engine might only do 80%.
While the MAP might not be a flow restriction till 750 CFM your out of 
calibation area  

Might just use the default tps/rpm fueling for anything over 4,000 rpm or boost.

If ya like the 165 use it for low TPS, and then a 749 for when your making 
HP, or do the chip flip and swich ecm from MAF to MAP at WOT.
Justin posted in the archives years ago about using a 256 prom innna 808, 
maybe do that and run bot set ups.
Bruce

>
>While I'm at it...and so the archives can be more complete.;-)...
>255 g/s air requires 21.25 g/s of fuel to make a 12:1 AF ratio... 
>what is g/s converted to #/hr?
>
>I smell a "ecm-calc" utility forming...
>
>thanks.
>
>
>~~~
>Dave Z. www.delanet.com/~tgp
>